S-1721 Series
www.sii-ic.com
SUPER-SMALL PACKAGE 2-CIRCUIT HIGH RIPPLE-REJECTION
LOW CURRENT CONSUMPTION LOW DROPOUT CMOS VOLTAGE REGULATOR
© Seiko Instruments Inc., 2007-2010 Rev.2.0_00
Seiko Instruments Inc. 1
S-1721 Series, developed using the CMOS technology, is a 2-channel positive voltage regulator IC which has the low
dropout voltage, the high-accuracy output voltage and the low output current consumption of 150 mA.
Users are able to use a small ceramic capacitor of 1.0 μF for this IC. This IC includes two regulator circuits in the package
SOT-23-6 or super-small SNT-6A.
S-1721 Series has much lower current consumption than S-1711 Series, this IC is ideal for mobile devices.
Features
• Output voltage: 1.2 V to 5.0 V, selectable in 0.05 V step.
• A ceramic capacitor of 1.0 μF or more can be used as the I/O capacitor.
• Wide input voltage range: 1.7 V to 6.5 V
• High-accuracy output voltage: ±1.0%
• Low dropout voltage: 130 mV typ. (products having the output of 3.0 V, IOUT = 100 mA)
• Low current consumption: During operation: 25 μA typ., 45 μA max. (products having the output of
3.0 V, per circuit)
During shutdown: 0.1 μA typ., 1.0 μA max.
• Output current: Possible to output 150 mA (at VIN ≥ VOUT(S) + 1.0 V)*1 (per circuit)
• High ripple rejection: 80 dB typ. (products having the output under 1.8 V, at 1.0 kHz)
• Built-in overcurrent protector: limits overcurrent of output transistor
• Built-in ON/OFF circuit: Ensures long battery life.
• Pull-up or pull-down resistor can be selected.
• Lead-free, Sn 100%, halogen-free*2
*1. Attention should be paid to the power dissipation of the package when the output current is large.
*2. Refer to “ Product Name Structure” for details.
Applications
• Power supply for cellular phones
• Power supply for battery-powered devices
Packages
• SNT-6A
• SOT-23-6
SUPER-SMALL PACKAGE 2-CIRCUIT HIGH RIPPLE-REJECTION LOW CURRENT CONSUMPTION LOW DROPOUT CMOS VOLTAGE REGULATOR
S-1721 Series Rev.2.0_00
Seiko Instruments Inc.
2
Block Diagrams
1. S-1721 Series A type
Function Status
1ch Active “H”
ON/OFF logic 2ch Active “H”
1ch
None
Pull-up resistor 2ch None
1ch Available
Pull-down resistor 2ch Available
*1. Parasitic diode
ON/OFF1
Overcurrent
protector
ON/OFF
circuit
Reference
voltage circuit
+
−
+
−
VIN
ON/OFF2
VOUT1
VSS
VOUT2
Overcurrent
protector
ON/OFF
circuit
Reference
voltage circuit
*1
*1
Figure 1
2. S-1721 Series B type
Function Status
1ch Active “H”
ON/OFF logic 2ch Active “L”
1ch
None
Pull-up resistor 2ch Available
1ch Available
Pull-down resistor 2ch None
*1. Parasitic diode
ON/OFF1
Overcurrent
protector
ON/OFF
circuit
Reference
voltage circuit
+
−
+
−
VIN
ON/OFF2
VOUT1
VSS
VOUT2
Overcurrent
protector
ON/OFF
circuit
Reference
voltage circuit
*1
*1
Figure 2
SUPER-SMALL PACKAGE 2-CIRCUIT HIGH RIPPLE-REJECTION LOW CURRENT CONSUMPTION LOW DROPOUT CMOS VOLTAGE REGULATOR
Rev.2.0_00 S-1721 Series
Seiko Instruments Inc. 3
3. S-1721 Series C type
Function Status
1ch Active “L”
ON/OFF logic 2ch Active “H”
1ch
Available
Pull-up resistor 2ch None
1ch None
Pull-down resistor 2ch Available
*1. Parasitic diode
ON/OFF1
Overcurrent
protector
ON/OFF
circuit
Reference
voltage circuit
+
−
+
−
VIN
ON/OFF2
VOUT1
VSS
VOUT2
Overcurrent
protector
ON/OFF
circuit
Reference
voltage circuit
*1
*1
Figure 3
4. S-1721 Series D type
Function Status
1ch Active “L”
ON/OFF logic 2ch Active “L”
1ch
Available
Pull-up resistor 2ch Available
1ch None
Pull-down resistor 2ch None
*1. Parasitic diode
ON/OFF1
Overcurrent
protector
ON/OFF
circuit
Reference
voltage circuit
+
−
+
−
VIN
ON/OFF2
VOUT1
VSS
VOUT2
Overcurrent
protector
ON/OFF
circuit
Reference
voltage circuit
*1
*1
Figure 4
SUPER-SMALL PACKAGE 2-CIRCUIT HIGH RIPPLE-REJECTION LOW CURRENT CONSUMPTION LOW DROPOUT CMOS VOLTAGE REGULATOR
S-1721 Series Rev.2.0_00
Seiko Instruments Inc.
4
5. S-1721 Series E type
Function Status
1ch Active “H”
ON/OFF logic 2ch Active “H”
1ch
None
Pull-up resistor 2ch None
1ch None
Pull-down resistor 2ch None
*1. Parasitic diode
ON/OFF1
Overcurrent
protector
ON/OFF
circuit
Reference
voltage circuit
+
−
+
−
VIN
ON/OFF2
VOUT1
VSS
VOUT2
Overcurrent
protector
ON/OFF
circuit
Reference
voltage circuit
*1
*1
Figure 5
6. S-1721 Series F type
Function Status
1ch Active “H”
ON/OFF logic 2ch Active “L”
1ch
None
Pull-up resistor 2ch None
1ch None
Pull-down resistor 2ch None
*1. Parasitic diode
ON/OFF1
Overcurrent
protector
ON/OFF
circuit
Reference
voltage circuit
+
−
+
−
VIN
ON/OFF2
VOUT1
VSS
VOUT2
Overcurrent
protector
ON/OFF
circuit
Reference
voltage circuit
*1
*1
Figure 6
SUPER-SMALL PACKAGE 2-CIRCUIT HIGH RIPPLE-REJECTION LOW CURRENT CONSUMPTION LOW DROPOUT CMOS VOLTAGE REGULATOR
Rev.2.0_00 S-1721 Series
Seiko Instruments Inc. 5
7. S-1721 Series G type
Function Status
1ch Active “L”
ON/OFF logic 2ch Active “H”
1ch
None
Pull-up resistor 2ch None
1ch None
Pull-down resistor 2ch None
*1. Parasitic diode
ON/OFF1
Overcurrent
protector
ON/OFF
circuit
Reference
voltage circuit
+
−
+
−
VIN
ON/OFF2
VOUT1
VSS
VOUT2
Overcurrent
protector
ON/OFF
circuit
Reference
voltage circuit
*1
*1
Figure 7
8. S-1721 Series H type
Function Status
1ch Active “L”
ON/OFF logic 2ch Active “L”
1ch
None
Pull-up resistor 2ch None
1ch None
Pull-down resistor 2ch None
*1. Parasitic diode
ON/OFF1
Overcurrent
protector
ON/OFF
circuit
Reference
voltage circuit
+
−
+
−
VIN
ON/OFF2
VOUT1
VSS
VOUT2
Overcurrent
protector
ON/OFF
circuit
Reference
voltage circuit
*1
*1
Figure 8
SUPER-SMALL PACKAGE 2-CIRCUIT HIGH RIPPLE-REJECTION LOW CURRENT CONSUMPTION LOW DROPOUT CMOS VOLTAGE REGULATOR
S-1721 Series Rev.2.0_00
Seiko Instruments Inc.
6
Product Name Structure
Users can select the product type, output voltage, and package type for the S-1721 Series. Refer to “1. Product
name” regarding the contents of product name, “2. Function list of product type” regarding the product type, “3.
Package” regarding the package drawings and “4. Product name list” regarding details of product name.
1. Product name
1. 1 SNT-6A
S-1721 x xx xx - I6T1 x
Environmental code
U : Lead-free (Sn 100%), halogen-free
G : Lead-free (for details, please contact our sales office)
Package abbreviation and IC packing specifications*1
I6T1: SNT-6A, tape product
Output voltage of voltage regulator 2*3
12 to 50
(e.g., when the output voltage is 1.5 V, it is expressed as 15.)
Output voltage of voltage regulator 1*3
12 to 50
(e.g., when the output voltage is 1.5 V, it is expressed as 15.)
Product type*2
A to H
*1. Refer to the tape specifications.
*2. Refer to “2. Function list of product type”.
*3. If you request the product which has 0.05 V step, contact our sales office.
1. 2 SOT-23-6
S-1721 x xx xx - M6T1 x
Environmental code
U : Lead-free (Sn 100%), halogen-free
G : Lead-free (for details, please contact our sales office)
Package abbreviation and IC packing specifications*1
M6T1: SOT-23-6, tape product
Output voltage of voltage regulator 2*3
12 to 50
(e.g., when the output voltage is 1.5 V, it is expressed as 15.)
Output voltage of voltage regulator 1*3
12 to 50
(e.g., when the output voltage is 1.5 V, it is expressed as 15.)
Product type*2
A to H
*1. Refer to the tape specifications.
*2. Refer to “2. Function list of product type”.
*3. If you request the product which has 0.05 V step, contact our sales office.
SUPER-SMALL PACKAGE 2-CIRCUIT HIGH RIPPLE-REJECTION LOW CURRENT CONSUMPTION LOW DROPOUT CMOS VOLTAGE REGULATOR
Rev.2.0_00 S-1721 Series
Seiko Instruments Inc. 7
2. Function list of product type
Table 1
Product Type ON/OFF Logic Pull-up Resistor Pull-down Resistor
A type 1ch Active “H”
2ch Active “H”
1ch None
2ch None
1ch Available
2ch Available
B type 1ch Active “H”
2ch Active “L”
1ch None
2ch Available
1ch Available
2ch None
C type 1ch Active “L”
2ch Active “H”
1ch Available
2ch None
1ch None
2ch Available
D type 1ch Active “L”
2ch Active “L”
1ch Available
2ch Available
1ch None
2ch None
E type 1ch Active “H”
2ch Active “H”
1ch None
2ch None
1ch None
2ch None
F type 1ch Active “H”
2ch Active “L”
1ch None
2ch None
1ch None
2ch None
G type 1ch Active “L”
2ch Active “H”
1ch None
2ch None
1ch None
2ch None
H type 1ch Active “L”
2ch Active “L”
1ch None
2ch None
1ch None
2ch None
3. Package
Drawing Code
Package Name Package Tape Reel Land
SNT-6A PG006-A-P-SD PG006-A-C-SD PG006-A-R-SD PG006-A-L-SD
SOT-23-6 MP006-A-P-SD MP006-A-C-SD MP006-A-R-SD −
SUPER-SMALL PACKAGE 2-CIRCUIT HIGH RIPPLE-REJECTION LOW CURRENT CONSUMPTION LOW DROPOUT CMOS VOLTAGE REGULATOR
S-1721 Series Rev.2.0_00
Seiko Instruments Inc.
8
4. Product name list
4.1 S-1721 series A type
ON/OFF logic : 1ch : Active “H”, 2ch : Active “H”
Pull-up resistor : 1ch : None, 2ch : None
Pull-down resistor : 1ch : Available, 2ch : Available
Table 2 (1 / 2)
Voltage Regulator 1
Output Voltage
Voltage Regulator 2
Output Voltage SNT-6A SOT-23-6
1.2 V ±15 mV 1.2 V ±15 mV S-1721A1212-I6T1x S-1721A1212-M6T1x
1.2 V ±15 mV 1.5 V ±1.0% S-1721A1215-I6T1x S-1721A1215-M6T1x
1.2 V ±15 mV 1.8 V ±1.0% S-1721A1218-I6T1x
−
1.2 V ±15mV 2.5 V ±1.0% S-1721A1225-I6T1x
−
1.2 V ±15 mV 2.6 V ±1.0% S-1721A1226-I6T1x
−
1.2 V ±15 mV 2.8 V ±1.0% S-1721A1228-I6T1x S-1721A1228-M6T1x
1.2 V ±15 mV 2.85 V ±1.0% S-1721A122J-I6T1x
−
1.2 V ±15 mV 3.0 V ±1.0% S-1721A1230-I6T1x
−
1.2 V ±15 mV 3.3 V ±1.0% S-1721A1233-I6T1x S-1721A1233-M6T1x
1.25 V ±15 mV 1.8 V ±1.0% S-1721A1C18-I6T1x
−
1.3 V ±15 mV 2.8 V ±1.0%
−
S-1721A1328-M6T1x
1.3 V ±15 mV 3.0 V ±1.0%
−
S-1721A1330-M6T1x
1.5 V ±1.0% 1.2 V ±15 mV S-1721A1512-I6T1x
−
1.5 V ±1.0% 1.3 V ±15 mV S-1721A1513-I6T1x
−
1.5 V ±1.0% 1.5 V ±1.0% S-1721A1515-I6T1x
−
1.5 V ±1.0% 1.8 V ±1.0% S-1721A1518-I6T1x
−
1.5 V ±1.0% 2.5 V ±1.0% S-1721A1525-I6T1x
−
1.5 V ±1.0% 2.8 V ±1.0%
−
S-1721A1528-M6T1x
1.5 V ±1.0% 2.85 V ±1.0% S-1721A152J-I6T1x
−
1.5 V ±1.0% 3.0 V ±1.0% S-1721A1530-I6T1x S-1721A1530-M6T1x
1.5 V ±1.0% 3.3 V ±1.0% S-1721A1533-I6T1x S-1721A1533-M6T1x
1.8 V ±1.0% 1.2 V ±15 mV S-1721A1812-I6T1x
−
1.8 V ±1.0% 1.5 V ±1.0% S-1721A1815-I6T1x
−
1.8 V ±1.0% 1.8 V ±1.0% S-1721A1818-I6T1x
−
1.8 V ±1.0% 2.5 V ±1.0% S-1721A1825-I6T1x S-1721A1825-M6T1x
1.8 V ±1.0% 2.6 V ±1.0% S-1721A1826-I6T1x
−
1.8 V ±1.0% 2.8 V ±1.0% S-1721A1828-I6T1x S-1721A1828-M6T1x
1.8 V ±1.0% 2.9 V ±1.0% S-1721A1829-I6T1x
−
1.8 V ±1.0% 2.85 V ±1.0% S-1721A182J-I6T1x
−
1.8 V ±1.0% 3.0 V ±1.0% S-1721A1830-I6T1x S-1721A1830-M6T1x
1.8 V ±1.0% 3.3 V ±1.0% S-1721A1833-I6T1x S-1721A1833-M6T1x
2.0 V ±1.0% 2.0 V ±1.0% S-1721A2020-I6T1x S-1721A2020-M6T1x
2.1 V ±1.0% 2.1 V ±1.0% S-1721A2121-I6T1x
−
2.5 V ±1.0% 1.2 V ±15 mV S-1721A2512-I6T1x
−
2.5 V ±1.0% 1.5 V ±1.0% S-1721A2515-I6T1x
−
2.5 V ±1.0% 1.8 V ±1.0% S-1721A2518-I6T1x S-1721A2518-M6T1x
SUPER-SMALL PACKAGE 2-CIRCUIT HIGH RIPPLE-REJECTION LOW CURRENT CONSUMPTION LOW DROPOUT CMOS VOLTAGE REGULATOR
Rev.2.0_00 S-1721 Series
Seiko Instruments Inc. 9
Table 2 (2 / 2)
Voltage Regulator 1
Output Voltage
Voltage Regulator 2
Output Voltage SNT-6A SOT-23-6
2.5 V ±1.0% 2.5 V ±1.0% S-1721A2525-I6T1x
−
2.5 V ±1.0% 2.8 V ±1.0% S-1721A2528-I6T1x
S-1721A2528-M6T1x
2.5 V ±1.0% 2.85 V ±1.0% S-1721A252J-I6T1x
−
2.5 V ±1.0% 3.0 V ±1.0% S-1721A2530-I6T1x
−
2.5 V ±1.0% 3.3 V ±1.0% S-1721A2533-I6T1x
−
2.6 V ±1.0% 1.3 V ±15 mV S-1721A2613-I6T1x
−
2.8 V ±1.0% 1.2 V ±15 mV S-1721A2812-I6T1x S-1721A2812-M6T1x
2.8 V ±1.0% 1.5 V ±1.0% S-1721A2815-I6T1x S-1721A2815-M6T1x
2.8 V ±1.0% 1.8 V ±1.0% S-1721A2818-I6T1x S-1721A2818-M6T1x
2.8 V ±1.0% 2.5 V ±1.0% S-1721A2825-I6T1x
−
2.8 V ±1.0% 2.6 V ±1.0% S-1721A2826-I6T1x
−
2.8 V ±1.0% 2.8 V ±1.0% S-1721A2828-I6T1x S-1721A2828-M6T1x
2.8 V ±1.0% 2.85 V ±1.0% S-1721A282J-I6T1x
−
2.8 V ±1.0% 3.0 V ±1.0% S-1721A2830-I6T1x
S-1721A2830-M6T1x
2.8 V ±1.0% 3.3 V ±1.0% S-1721A2833-I6T1x S-1721A2833-M6T1x
2.85 V ±1.0% 1.2 V ±15 mV S-1721A2J12-I6T1x
−
2.85 V ±1.0% 1.5 V ±1.0% S-1721A2J15-I6T1x
−
2.85 V ±1.0% 1.8 V ±1.0% S-1721A2J18-I6T1x
−
2.85 V ±1.0% 2.85 V ±1.0% S-1721A2J2J-I6T1x S-1721A2J2J-M6T1x
2.85 V ±1.0% 3.3 V ±1.0% S-1721A2J33-I6T1x
−
3.0 V ±1.0% 1.8 V ±1.0% S-1721A3018-I6T1x
−
3.0 V ±1.0% 2.8 V ±1.0% S-1721A3028-I6T1x
−
3.0 V ±1.0% 3.0 V ±1.0% S-1721A3030-I6T1x
−
3.0 V ±1.0% 3.3 V ±1.0% S-1721A3033-I6T1x
−
3.1 V ±1.0% 1.9 V ±1.0% S-1721A3119-I6T1x
−
3.3 V ±1.0% 1.2 V ±15 mV
−
S-1721A3312-M6T1x
3.3 V ±1.0% 1.8 V ±1.0% S-1721A3318-I6T1x S-1721A3318-M6T1x
3.3 V ±1.0% 2.8 V ±1.0%
−
S-1721A3328-M6T1x
3.3 V ±1.0% 3.0 V ±1.0% S-1721A3330-I6T1x
−
3.3 V ±1.0% 3.3 V ±1.0% S-1721A3333-I6T1x S-1721A3333-M6T1x
Remark 1. Please contact our sales office for products with specifications other than the above.
2. x: G or U
3. Please select products of environmental code = U for Sn 100%, halogen-free products.
SUPER-SMALL PACKAGE 2-CIRCUIT HIGH RIPPLE-REJECTION LOW CURRENT CONSUMPTION LOW DROPOUT CMOS VOLTAGE REGULATOR
S-1721 Series Rev.2.0_00
Seiko Instruments Inc.
10
4.2 S-1721 series B type
ON/OFF logic : 1ch : Active “H”, 2ch : Active “L”
Pull-up resistor : 1ch : None, 2ch : Available
Pull-down resistor : 1ch : Available, 2ch : None
Table 3
Voltage Regulator 1
Output Voltage
Voltage Regulator 2
Output Voltage SNT-6A SOT-23-6
1.5 V ±1.0% 1.5 V ±1.0% S-1721B1515-I6T1x −
1.5 V ±1.0% 1.8 V ±1.0% S-1721B1518-I6T1x −
1.8 V ±1.0% 1.2 V ±15 mV S-1721B1812-I6T1x −
1.8 V ±1.0% 1.8 V ±1.0% S-1721B1818-I6T1x −
2.8 V ±1.0% 1.8 V ±1.0% S-1721B2818-I6T1x −
2.8 V ±1.0% 2.8 V ±1.0% − S-1721B2828-M6T1x
2.85 V ±1.0% 2.85 V ±1.0% S-1721B2J2J-I6T1x −
4.3 S-1721 series C type
ON/OFF logic : 1ch : Active “L”, 2ch : Active “H”
Pull-up resistor : 1ch : Available, 2ch : None
Pull-down resistor : 1ch : None, 2ch : Available
Table 4
Voltage Regulator 1
Output Voltage
Voltage Regulator 2
Output Voltage SNT-6A SOT-23-6
2.85 V ±1.0% 2.85 V ±1.0% S-1721C2J2J-I6T1x S-1721C2J2J-M6T1x
4.4 S-1721 series D type
ON/OFF logic : 1ch : Active “L”, 2ch : Active “L”
Pull-up resistor : 1ch : Available, 2ch : Available
Pull-down resistor : 1ch : None, 2ch : None
Table 5
Voltage Regulator 1
Output Voltage
Voltage Regulator 2
Output Voltage SNT-6A SOT-23-6
1.8 V ±1.0% 1.8 V ±1.0% S-1721D1818-I6T1x −
1.8 V ±1.0% 2.8 V ±1.0% − S-1721D1828-M6T1x
3.3 V ±1.0% 1.8 V ±1.0% S-1721D3318-I6T1x S-1721D3318-M6T1x
Remark 1. Please contact our sales office for products with specifications other than the above.
2. x: G or U
3. Please select products of environmental code = U for Sn 100%, halogen-free products.
SUPER-SMALL PACKAGE 2-CIRCUIT HIGH RIPPLE-REJECTION LOW CURRENT CONSUMPTION LOW DROPOUT CMOS VOLTAGE REGULATOR
Rev.2.0_00 S-1721 Series
Seiko Instruments Inc. 11
4.5 S-1721 series E type
ON/OFF logic : 1ch : Active “H”, 2ch : Active “H”
Pull-up resistor : 1ch : None, 2ch : None
Pull-down resistor : 1ch : None, 2ch : None
Table 6
Voltage Regulator 1
Output Voltage
Voltage Regulator 2
Output Voltage SNT-6A SOT-23-6
1.3 V ±15 mV 2.8 V ±1.0% S-1721E1328-I6T1x −
1.5 V ±1.0% 2.8 V ±1.0% S-1721E1528-I6T1x S-1721E1528-M6T1x
1.8 V ±1.0% 2.5 V ±1.0% − S-1721E1825-M6T1x
1.8 V ±1.0% 2.6 V ±1.0% − S-1721E1826-M6T1x
1.8 V ±1.0% 2.8 V ±1.0% S-1721E1828-I6T1x S-1721E1828-M6T1x
1.8 V ±1.0% 3.0 V ±1.0% − S-1721E1830-M6T1x
1.8 V ±1.0% 3.3 V ±1.0% S-1721E1833-I6T1x S-1721E1833-M6T1x
2.0 V ±1.0% 2.5 V ±1.0% − S-1721E2025-M6T1x
2.5 V ±1.0% 1.8 V ±1.0% S-1721E2518-I6T1x −
2.5 V ±1.0% 2.5 V ±1.0% S-1721E2525-I6T1x −
2.5 V ±1.0% 3.0 V ±1.0% S-1721E2530-I6T1x −
2.8 V ±1.0% 1.3 V ±15 mV − S-1721E2813-M6T1x
2.8 V ±1.0% 1.8 V ±1.0% S-1721E2818-I6T1x S-1721E2818-M6T1x
2.8 V ±1.0% 3.3 V ±1.0% S-1721E2833-I6T1x S-1721E2833-M6T1x
2.85 V ±1.0% 2.5 V ±1.0% S-1721E2J25-I6T1x S-1721E2J25-M6T1x
2.85 V ±1.0% 2.85 V ±1.0% S-1721E2J2J-I6T1x −
3.0 V ±1.0% 1.2 V ±15 mV S-1721E3012-I6T1x −
3.0 V ±1.0% 2.5 V ±1.0% S-1721E3025-I6T1x −
3.0 V ±1.0% 3.3 V ±1.0% S-1721E3033-I6T1x −
3.3 V ±1.0% 1.2 V ±15 mV − S-1721E3312-M6T1x
Remark 1. Please contact our sales office for products with specifications other than the above.
2. x: G or U
3. Please select products of environmental code = U for Sn 100%, halogen-free products.
SUPER-SMALL PACKAGE 2-CIRCUIT HIGH RIPPLE-REJECTION LOW CURRENT CONSUMPTION LOW DROPOUT CMOS VOLTAGE REGULATOR
S-1721 Series Rev.2.0_00
Seiko Instruments Inc.
12
Pin Configurations
Table 7
Pin No. Symbol Description
1 ON/OFF2 ON/OFF pin 2
2 VIN Input voltage pin
3 ON/OFF1 ON/OFF pin 1
4 VSS GND pin
SNT-6A
Top view
1
2
3 4
6
5
5 VOUT1 Output voltage pin 1
6 VOUT2 Output voltage pin 2
Figure 9
Table 8
Pin No. Symbol Description
1 ON/OFF1 ON/OFF pin 1
2 VIN Input voltage pin
3 ON/OFF2 ON/OFF pin 2
4 VOUT2 Output voltage pin 2
5 VSS GND pin
6 VOUT1 Output voltage pin 1
6 4
1
3
2
SOT-23-6
Top view
5
Figure 10
SUPER-SMALL PACKAGE 2-CIRCUIT HIGH RIPPLE-REJECTION LOW CURRENT CONSUMPTION LOW DROPOUT CMOS VOLTAGE REGULATOR
Rev.2.0_00 S-1721 Series
Seiko Instruments Inc. 13
Absolute Maximum Ratings
Table 9
(Ta = 25°C unless otherwise specified)
Item Symbol Absolute Maximum Rating Unit
VIN V
SS − 0.3 to VSS + 7.0 V
Input voltage VON/OFF1, 2 V
SS − 0.3 to VIN + 0.3 V
Output voltage VOUT1, 2 V
SS − 0.3 to VIN + 0.3 V
SNT-6A 400*1 mW
Power dissipation SOT-23-6 PD 650*1 mW
Operating ambient temperature Topr −40 to +85 °C
Storage temperature Tstg −40 to +125 °C
*1. When mounted on board
[Mounted board]
(1) Board size : 114.3 mm × 76.2 mm × t1.6 mm
(2) Board name : JEDEC STANDARD51-7
Caution The absolute maximum ratings are rated values exceeding which the product could suffer physical
damage. These values must therefore not be exceeded under any conditions.
0
50
100
150
400
200
0
700
300
100
SNT-6A
SOT-23-6
500
600
Power Dissipation (P
D
) [mW]
Ambient Temperature (Ta) [°C]
Figure 11 Power Dissipation of Package (when mounted on board)
SUPER-SMALL PACKAGE 2-CIRCUIT HIGH RIPPLE-REJECTION LOW CURRENT CONSUMPTION LOW DROPOUT CMOS VOLTAGE REGULATOR
S-1721 Series Rev.2.0_00
Seiko Instruments Inc.
14
Electrical Characteristics
Table 10
Voltage regulator 1 and voltage regulator 2 (per circuit) (Ta = 25°C unless otherwise specified)
Item Symbol Conditions Min. Typ. Max. Unit
Test
Circuit
1.2 V
≤
V
OUT(S)
< 1.5 V V
OUT(S)
−
0.015 V
OUT(S)
V
OUT(S)
+ 0.015 V 2, 3
Output voltage
*1
V
OUT(E)
V
IN
= V
OUT(S)
+
1.0 V,
I
OUT
= 30 mA 1.5 V
≤
V
OUT(S)
≤
5.0 V V
OUT(S)
×
0.99 V
OUT(S)
V
OUT(S)
×
1.01 V 2, 3
Output current
*2
I
OUT
V
IN
≥
V
OUT(S)
+
1.0 V 150
*5
⎯
⎯
mA 4, 5
1.2 V
≤
V
OUT(S)
< 1.3 V 0.50 0.54 0.58 V 2, 3
1.3 V
≤
V
OUT(S)
< 1.4 V 0.40 0.44 0.48 V 2, 3
1.4 V
≤
V
OUT(S)
< 1.5 V 0.30 0.34 0.39 V 2, 3
1.5 V
≤
V
OUT(S)
< 1.7 V
⎯
0.26 0.39 V 2, 3
1.7 V
≤
V
OUT(S)
< 2.0 V
⎯
0.20 0.35 V 2, 3
2.0 V
≤
V
OUT(S)
< 2.8 V
⎯
0.16 0.24 V 2, 3
Dropout voltage
*3
V
drop
I
OUT
= 100 mA
2.8 V
≤
V
OUT(S)
≤
5.0 V
⎯
0.13 0.23 V 2, 3
Line regulation
OUTIN
OUT1
VV
V
•Δ
Δ
V
OUT(S)
+
0.5 V
≤
V
IN
≤
6.5 V, I
OUT
= 30 mA
⎯
0.05 0.2 %/V 2, 3
Load regulation
Δ
V
OUT2
V
IN
= V
OUT(S)
+
1.0 V, 100
μ
A
≤
I
OUT
≤
100 mA
⎯
20 40 mV 2, 3
Output voltage
temperature coefficient
*4
OUT
OUT
VTa
V
•Δ
Δ
V
IN
= V
OUT(S)
+
1.0 V, I
OUT
= 30 mA,
−
40
°
C
≤
Ta
≤
+85
°
C
⎯
±
120
⎯
ppm/
°
C2, 3
V
IN
= V
OUT(S)
+
1.0 V, ON/OFF pin = ON, no load
1.2 V
≤
V
OUT(S)
< 1.5 V
⎯
35 45
μ
A 1
V
IN
= V
OUT(S)
+
1.0 V, ON/OFF pin = ON, no load
1.5 V
≤
V
OUT(S)
< 1.8 V
⎯
32 45
μ
A 1
Current consumption
during operation
(per circuit)
I
SS1
V
IN
= V
OUT(S)
+
1.0 V, ON/OFF pin = ON, no load
1.8 V
≤
V
OUT(S)
≤
5.0 V
⎯
25 45
μ
A 1
Current consumption
during shutdown I
SS2
V
IN
= V
OUT(S)
+
1.0 V, ON/OFF pin = OFF, no load
⎯
0.1 1.0
μ
A 1
Input voltage V
IN
⎯
1.7
⎯
6.5 V 1
ON/OFF pin
input voltage “H” V
SH
V
IN
= V
OUT(S)
+
1.0 V, R
L
= 1.0 k
Ω
1.2
⎯
⎯
V
6, 7
ON/OFF pin
input voltage “L” V
SL
V
IN
= V
OUT(S)
+
1.0 V, R
L
= 1.0 k
Ω
⎯
⎯
0.3 V
6, 7
B (2ch)/C (1ch)/D/E/F/G/H type
−
0.1
⎯
0.1
μ
A ON/OFF pin
input current “H” I
SH
V
IN
= 6.5 V,
V
ON/OFF
= 6.5 V A/B (1ch)/C (2ch) type 1.0 2.5 4.2
μ
A 6, 7
A/B (1ch)/C (2ch)/E/F/G/H type
−
0.1
⎯
0.1
μ
A
ON/OFF pin
input current “L” I
SL
V
IN
= 6.5 V,
V
ON/OFF
= 0 V B (2ch)/C (1ch)/D type 1.0 2.5 4.2
μ
A 6, 7
1.2 V
≤
V
OUT(S)
< 1.8 V
⎯
80
⎯
dB
8, 9
1.8 V
≤
V
OUT(S)
< 3.1 V
⎯
75
⎯
dB
8, 9
Ripple rejection
RR
V
IN
= V
OUT(S)
+
1.0 V,
f = 1.0 kHz,
Δ
V
rip
= 0.5 Vrms,
I
OUT
= 30 mA 3.1 V
≤
V
OUT(S)
≤
5.0 V
⎯
70
⎯
dB
8, 9
Short-circuit current I
short
V
IN
= V
OUT(S)
+
1.0 V, ON/OFF pin = ON, V
OUT
= 0 V
⎯
150
⎯
mA
4, 5
Shutdown pull-up/pull-
down resistor R
PD
⎯
1.5 2.6 6.5 M
Ω
6, 7
SUPER-SMALL PACKAGE 2-CIRCUIT HIGH RIPPLE-REJECTION LOW CURRENT CONSUMPTION LOW DROPOUT CMOS VOLTAGE REGULATOR
Rev.2.0_00 S-1721 Series
Seiko Instruments Inc. 15
*1. VOUT(S): Specified output voltage
VOUT(E): Actual output voltage at the fixed load
Output voltage when fixing IOUT(= 30 mA) and inputting VOUT(S) +1.0 V
*2. The output current at which the output voltage becomes 95% of VOUT(E) after gradually increasing the output current.
*3. Vdrop = VIN1 − (VOUT3 × 0.98)
V
OUT3 is the output voltage when VIN = VOUT(S) + 1.0 V and IOUT = 100 mA.
VIN1 is the input voltage at which the output voltage becomes 98% of VOUT3 after gradually decreasing the input voltage.
*4. The change in temperature [mV/°C] is calculated using the following equation.
[] [] []
1000Cppm/
VΔTa
ΔV
VVCmV/
ΔTa
ΔV
OUT
OUT
OUT(S)
OUT ÷°
•
×=° 3*2*1*
*1. Change in temperature of the output voltage
*2. Specified output voltage
*3. Output voltage temperature coefficient
*5. The output current can be at least this value.
Due to restrictions on the package power dissipation, this value may not be satisfied. Attention should be paid to the power
dissipation of the package when the output current is large.
This specification is guaranteed by design.
SUPER-SMALL PACKAGE 2-CIRCUIT HIGH RIPPLE-REJECTION LOW CURRENT CONSUMPTION LOW DROPOUT CMOS VOLTAGE REGULATOR
S-1721 Series Rev.2.0_00
Seiko Instruments Inc.
16
Test Circuit
1. VIN
VOUT2 VOUT1
ON/OFF2 ON/OFF1
VSS
A
*1
*1
*1. Set to VIN or GND
+
Figure 12
2.
VIN
VOUT2 VOUT1
ON/OFF2 ON/OFF1
VSS
A
*1
*2
+
V
+
*1. Set to power-off
*2. Set to power-on
Figure 13
3.
*1
*2
*1. Set to power-on
*2. Set to
p
ower-off
A +
+
V
VIN
VOUT2 VOUT1
ON/OFF2 ON/OFF1
VSS
Figure 14
4.
VIN
VOUT2 VOUT1
ON/OFF2 ON/OFF1
VSS
A
*1
*2
+
V
*1. Set to powe
r
-off
*2. Set to VIN or GND
Figure 15
5.
*1
*2
*1. Set to VIN or GND
*2. Set to power-off
A
+
V
VIN
VOUT2 VOUT1
ON/OFF2 ON/OFF1
VSS
Figure 16
SUPER-SMALL PACKAGE 2-CIRCUIT HIGH RIPPLE-REJECTION LOW CURRENT CONSUMPTION LOW DROPOUT CMOS VOLTAGE REGULATOR
Rev.2.0_00 S-1721 Series
Seiko Instruments Inc. 17
6.
VIN
VOUT2 VOUT1
ON/OFF2 ON/OFF1
VSS
A
*1
+
V
*1. Set to powe
r
-off
R
L
+
Figure 17
7.
*1
+
*1. Set to powe
r
-off
R
L
VIN
VOUT2 VOUT1
ON/OFF2 ON/OFF1
VSS
A
V
+
Figure 18
8.
*1
+
V
*1. Set to power-off
*2. Set to
p
ower-on
R
L
VIN
VOUT2 VOUT1
ON/OFF2 ON/OFF1
VSS
*2
Figure 19
9.
*1
*1. Set to powe
r
-on
*2. Set to
p
owe
r
-off
*2
+
R
L
V
VIN
VOUT2 VOUT1
ON/OFF2 ON/OFF1
VSS
Figure 20
SUPER-SMALL PACKAGE 2-CIRCUIT HIGH RIPPLE-REJECTION LOW CURRENT CONSUMPTION LOW DROPOUT CMOS VOLTAGE REGULATOR
S-1721 Series Rev.2.0_00
Seiko Instruments Inc.
18
Standard Circuit
*1. C
IN is a capacitor for stabilizing the input.
*2. A ceramic capacitor of 1.0 μF or more can be used for CL1 and CL2.
VOUT1
ON/OFF1
ON/OFF2
GND
VIN
VOUT2
Single GND
OUTPUT 1 INPUT
VSS
OUTPUT 2
CL2
*2
CL1
*2
CIN
*1
Figure 21
Caution The above connection diagram and constant will not guarantee successful operation. Perform
thorough evaluation using the actual application to set the constant.
Condition of Application
Input capacitor (CIN) : 1.0 μF or more
Output capacitor (CL1, CL2) : 1.0 μF or more (ceramic capacitor)
Caution A general series regulator may oscillate, depending on the external components. Confirm that no
oscillation occurs in the application for which the above capacitors are used.
Selection of Input and Output Capacitors (CIN, CL1, CL2)
The S-1721 Series requires an output capacitor between the VOUT and VSS pin for phase compensation. Operation is
stabilized by a ceramic capacitor with an output capacitance of 1.0 μF or more over the entire temperature range.
When using an OS capacitor, tantalum capacitor, or aluminum electrolytic capacitor, the capacitance must be 1.0 μF or
more.
The value of the output overshoot or undershoot transient response varies depending on the value of the output
capacitor. The required capacitance of the input capacitor differs depending on the application.
The recommended capacitance for an application is CIN ≥ 1.0 μF, CL1 ≥ 1.0 μF, CL2 ≥ 1.0 μF; however, when selecting
the output capacitor, perform sufficient evaluation, including evaluation of temperature characteristics, on the actual
device.
SUPER-SMALL PACKAGE 2-CIRCUIT HIGH RIPPLE-REJECTION LOW CURRENT CONSUMPTION LOW DROPOUT CMOS VOLTAGE REGULATOR
Rev.2.0_00 S-1721 Series
Seiko Instruments Inc. 19
Explanation of Terms
1. Low dropout voltage regulator
This IC’s voltage regulator has the low dropout voltage due to its built-in low on-resistance transistor.
2. Output voltage (VOUT)
The accuracy of the output voltage is ensured at ±1.0% under the specified conditions of fixed input voltage*1, fixed
output current, and fixed temperature.
*1. Differs depending on the product.
Caution If the above conditions change, the output voltage value may vary and exceed the accuracy
range of the output voltage. See “ Electrical Characteristics” and “ Characteristics (Typical
Data) (Per Circuit)” for details.
3. Line regulation
Indicates the dependency of the output voltage on the input voltage. That is, the values show how much the output
voltage changes due to a change in the input voltage with the output current remaining unchanged.
4. Load regulation (ΔVOUT2)
Indicates the dependency of the output voltage on the output current. That is, the values show how much the output
voltage changes due to a change in the output current with the input voltage remaining unchanged.
5. Dropout voltage (Vdrop)
Indicates the difference between input voltage VIN and the output voltage when; decreasing input voltage VIN
gradually until the output voltage has dropped out to the value of 98% of output voltage VOUT3, which is at VIN =
VOUT(S) + 1.0 V.
Vdrop = VIN1 − (VOUT3 × 0.98)
ΔVOUT1
ΔVIN •VOUT
SUPER-SMALL PACKAGE 2-CIRCUIT HIGH RIPPLE-REJECTION LOW CURRENT CONSUMPTION LOW DROPOUT CMOS VOLTAGE REGULATOR
S-1721 Series Rev.2.0_00
Seiko Instruments Inc.
20
6. Temperature coefficient of output voltage
The shaded area in Figure 22 is the range where VOUT varies in the operating temperature range when the
temperature coefficient of the output voltage is ±120 ppm/°C.
V
OUT(E)*1
Example of V
OUT
= 3.0 V Typ. products
−40 25
+0.36 mV/°C
V
OUT
[V]
*1. V
OUT(E)
is the value of the output voltage measured at 25°C.
85 Ta [°C]
−0.36 mV/°C
Figure 22
A change in the temperature of the output voltage [mV/°C] is calculated using the following equation.
[] [] []
1000Cppm/
VΔTa
ΔV
VVCmV/
ΔTa
ΔV
OUT
OUT
OUT(S)
OUT ÷°
•
×=° *32*1*
*1. Change in temperature of output voltage
*2. Specified output voltage
*3. Output voltage temperature coefficient
ΔVOUT
ΔTa •VOUT
SUPER-SMALL PACKAGE 2-CIRCUIT HIGH RIPPLE-REJECTION LOW CURRENT CONSUMPTION LOW DROPOUT CMOS VOLTAGE REGULATOR
Rev.2.0_00 S-1721 Series
Seiko Instruments Inc. 21
Operation
1. Basic operation
Figure 23 shows the block diagram of S-1721 Series.
The error amplifier compares the reference voltage (Vref) with Vfb, which is the output voltage resistance-divided by
feedback resistors Rs and Rf. It supplies the gate voltage necessary to maintain the constant output voltage which is
not influenced by the input voltage and temperature change, to the output transistor.
*1
*1. Parasitic diode
VSS
Current
supply
−
+
Vfb
Vref
VIN
VOUT
Rf
Rs
Error
amplifier
Reference voltage
circuit
Figure 23
2. Output transistor
In the S-1721 Series, a low on-resistance P-channel MOS FET is used as the output transistor.
Be sure that VOUT does not exceed VIN + 0.3 V to prevent the voltage regulator from being damaged due to inverse
current flowing from the VOUT pin through a parasitic diode to the VIN pin.
SUPER-SMALL PACKAGE 2-CIRCUIT HIGH RIPPLE-REJECTION LOW CURRENT CONSUMPTION LOW DROPOUT CMOS VOLTAGE REGULATOR
S-1721 Series Rev.2.0_00
Seiko Instruments Inc.
22
3. ON/OFF pin 1 and 2
These pins start and stop the regulator.
When the ON/OFF pin is set to the power-off level, the entire internal circuit stops operating, and the built-in P-
channel MOS FET output transistor between the VIN and VOUT pin is turned off, in order to reduce the current
consumption significantly. The VOUT pin is set to the VSS level by the internal dividing resistor of several hundred
kΩ which is placed between the VOUT and VSS pin. Note that the current consumption increases when a voltage of
0.3 V to 1.2 V (@Ta = 25°C) is applied to the ON/OFF pin.
The ON/OFF pin is configured as shown in Figures 24 and 25. In the S-1721 Series A, B C, and D types, the
ON/OFF pin is internally pulled up to VIN or pulled down to VSS when in the floating status, so the VOUT pin is set
to the VSS level.
In the S-1721 Series E, F, G and H types, do not use S-1721 Series in the floating status because the ON/OFF pin
is not internally pulled up or pulled down.
When not using the ON/OFF pin in the S-1721 Series E, F, G, and H types, connect the ON/OFF pin to the VIN pin
in the E, F (1ch only), and G (2ch only) types. In the F (2ch only), G (1ch only) and H types, connect the ON/OFF pin
to the VSS pin.
Table 11
Logic Type ON/OFF Pin Internal
Circuits VOUT Pin Voltage Current
Consumption
A 1ch “H”: Power on
2ch “H”: Power on
Operate
Operate
Set value
Set value
ISS1
ISS1
B 1ch “H”: Power on
2ch “L”: Power on
Operate
Operate
Set value
Set value
ISS1
ISS1
C 1ch “L”: Power on
2ch “H”: Power on
Operate
Operate
Set value
Set value
ISS1
ISS1
D 1ch “L”: Power on
2ch “L”: Power on
Operate
Operate
Set value
Set value
ISS1
ISS1
E 1ch “L”: Power off
2ch “L”: Power off
Stop
Stop
VSS level
VSS level
ISS2
ISS2
F 1ch “L”: Power off
2ch “H”: Power off
Stop
Stop
VSS level
VSS level
ISS2
ISS2
G 1ch “H”: Power off
2ch “L”: Power off
Stop
Stop
VSS level
VSS level
ISS2
ISS2
H 1ch “H”: Power off
2ch “H”: Power off
Stop
Stop
VSS level
VSS level
ISS2
ISS2
(1) S-1721 Series A, B, C, D Types (2) S-1721 Series E, F, G, H Types
VSS
VIN
ON/OFF
B (2ch), C (1ch), D types
A, B (1ch), C (2ch) type
VSS
VIN
ON/OFF
Figure 24 Figure 25
SUPER-SMALL PACKAGE 2-CIRCUIT HIGH RIPPLE-REJECTION LOW CURRENT CONSUMPTION LOW DROPOUT CMOS VOLTAGE REGULATOR
Rev.2.0_00 S-1721 Series
Seiko Instruments Inc. 23
4. Overcurrent protector
The S-1721 Series has a built-in overcurrent protector having the characteristics shown in (1) Output Voltage vs.
Output Current (Ta = 25°C) in “ Characteristics (Typical Data) (Per Circuit)” to protect the output transistor
against an excessive output current and short circuiting between the VOUT and VSS pin.
The current (Ishort) when the output pin is short-circuited is internally set at approximately 150 mA (Typ.), and the
initial value is restored for the output voltage, if releasing a short circuit once.
Caution Note that the overcurrent protect circuit does not provide a thermal protection function, therefore
pay attention to the conditions of input voltage and load current so that the IC’s loss under the
usage conditions, including the short circuit conditions, does not exceed the package power
dissipation if the condition in which a short circuiting or large current state (150 mA or more)
continues for a long time.
5. Pull-down/pull-up resistor (S-1721 Series A, B, C, and D types)
In the S-1721 Series A, B, C, and D types, the ON/OFF pin is internally pulled up to VIN or pulled down to VSS, so
the VOUT pin is in the VSS level when in the floating status.
In A/B (1ch only) and C (2ch only), the ON/OFF pin is connected to VIN,
In B (2ch only)/C (1ch only)/D type, the ON/OFF pin is connected to VSS;
Note that during operation in these cases, the current consumption of the IC is generated as much as the current
which flows into a pull-up resistor of 2.6 MΩ or a pull-down resistor of 2.6 MΩ.
SUPER-SMALL PACKAGE 2-CIRCUIT HIGH RIPPLE-REJECTION LOW CURRENT CONSUMPTION LOW DROPOUT CMOS VOLTAGE REGULATOR
S-1721 Series Rev.2.0_00
Seiko Instruments Inc.
24
Precautions
• Wiring patterns for the VIN, VOUT and GND pins should be designed so that the impedance is low. When mounting
an output capacitor between the VOUT and VSS pin (CL1, CL2) and a capacitor for stabilizing the input between VIN
and VSS pin (CIN), the distance from the capacitors to these pins should be as short as possible.
• Note that the output voltage may increase when a series regulator is used at low load current (1.0 mA or less).
• Note that the output voltage may increase due to the leakage current from a driver when a series regulator is used
at high temperature.
• Generally a series regulator may cause oscillation, depending on the selection of external parts. The following
conditions are recommended for this IC. However, be sure to perform sufficient evaluation under the actual usage
conditions for selection, including evaluation of temperature characteristics. See “(5) Example of Equivalent Series
Resistance vs. Output Current Characteristics (Ta = 25°C)” in “ Reference Data (Per Circuit)” for the
equivalent series resistance (RESR) of the output capacitor.
Input capacitor (CIN) : 1.0 μF or more
Output capacitor (CL1, CL2) : 1.0 μF or more
• The voltage regulator may oscillate when the impedance of the power supply is high and the input capacitor is small
or an input capacitor is not connected. Note that, if the capacitance of the output capacitor is greater than that of the
input capacitor, the voltage regulator may oscillate.
• Note that an oscillation may occur when the load current is high (100 mA or higher) and the difference between the
voltage input and output is around the dropout voltage if the inductance of the power supply is high. Perform
sufficient evaluation including electrical characteristics under the actual use conditions to select an input capacitor.
• Concerning the fluctuation of output voltage due to power-supplying and load, confirm with the actual device.
• If the power supply suddenly increases, a momentary overshoot may be output. It is therefore important to
sufficiently evaluate the output voltage at power application in the actual equipment.
• The application conditions for the input voltage, output voltage, and load current should not exceed the package
power dissipation.
• Do not apply an electrostatic discharge to this IC that exceeds the performance ratings of the built-in electrostatic
protection circuit.
• In determining the output current, attention should be paid to the output current value specified in Table 10 in “
Electrical Characteristics” and footnote *5 of the table.
• SII claims no responsibility for any disputes arising out of or in connection with any infringement by products
including this IC of patents owned by a third party.
SUPER-SMALL PACKAGE 2-CIRCUIT HIGH RIPPLE-REJECTION LOW CURRENT CONSUMPTION LOW DROPOUT CMOS VOLTAGE REGULATOR
Rev.2.0_00 S-1721 Series
Seiko Instruments Inc. 25
Characteristics (Typical Data) (Per Circuit)
(1) Output Voltage vs. Output Current (When Load Current Increases) (Ta = 25°C)
VOUT = 1.2 V VOUT = 3.0 V
0 100 200 400
V
OUT
[V]
1.2
0.8
0.4
0
I
OUT
[mA]
1.6
300
1.4
1.0
0.6
0.2
V
IN
= 1.5 V
1.7 V
2.2 V
3.2 V
6.5 V
V
OUT
[V]
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
I
OUT
[mA]
0 100 200 400300
V
IN
= 3.3 V
3.5 V
4.0 V
5.0 V
6.5 V
VOUT = 5.0 V
0 100 200 400
V
OUT
[V]
5
3
1
0
I
OUT
[mA]
6
300
4
2
V
IN
= 5.3 V
5.5 V
6.0 V
6.5 V
Remark In determining the output current, attention should
be paid to the following.
1. The minimum output current value and
footnote *5 in Table 10 in the “ Electrical
Characteristics”
2. The package power dissipation
(2) Output Voltage vs. Input Voltage (Ta = 25°C)
VOUT = 1.2 V VOUT = 3.0 V
1.0 1.5 2.0 2.5 3.0
VOUT [V]
1.30
1.20
1.15
1.05
1.00
VIN [V] 3.5
IOUT = 1 mA
IOUT = 50 mA
IOUT = 30 mA
1.10
1.25
2.5 3.0 3.5 4.0 4.5
VOUT [V]
3.1
3.0
2.9
2.8
2.7
2.6
2.5
VIN [V] 5.0
IOUT = 1 mA
IOUT = 50 mA
IOUT = 30 mA
VOUT = 5.0 V
4.5 5.0 5.5 6.0
VOUT [V]
5.2
5.1
5.0
4.8
4.7
4.6
4.5
VIN [V] 6.5
4.9
I
OUT
= 1 mA
I
OUT
= 50 mA
I
OUT
= 30 mA
SUPER-SMALL PACKAGE 2-CIRCUIT HIGH RIPPLE-REJECTION LOW CURRENT CONSUMPTION LOW DROPOUT CMOS VOLTAGE REGULATOR
S-1721 Series Rev.2.0_00
Seiko Instruments Inc.
26
(3) Dropout Voltage vs. Output Current
VOUT = 1.2 V VOUT = 3.0 V
0100 200
V
drop
[V]
0.45
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0
I
OUT
[mA] 15050
85°C
25°C
−40°C
0.40
0100 200
V
drop
[V]
0.30
0.20
0.15
0.10
0.05
0
I
OUT
[mA] 15050
85°C
25°C
−40°C
0.25
VOUT = 5.0 V
0100 200
V
drop
[V]
0.25
0.20
0.15
0.10
0.05
0
I
OUT
[mA] 15050
85°C
25°C
−40°C
(4) Dropout Voltage vs. Set Output Voltage
023
Vdrop [V]
0.40
0.35
0.25
0.20
0.15
0.10
0.05
VOTA [V]
1456
0
150 mA
100 mA
50 mA
30 mA
10 mA
0.30
SUPER-SMALL PACKAGE 2-CIRCUIT HIGH RIPPLE-REJECTION LOW CURRENT CONSUMPTION LOW DROPOUT CMOS VOLTAGE REGULATOR
Rev.2.0_00 S-1721 Series
Seiko Instruments Inc. 27
(5) Output Voltage vs. Ambient Temperature
VOUT = 1.2 V VOUT = 3.0 V
−40 0 25 50 75
VOUT [V]
1.30
1.20
1.15
1.10
Ta [°C]
1.25
−25 85
−40 0 25 50 75
VOUT [V]
3.20
3.00
2.90
2.80
Ta [°C]
3.10
−25 85
3.05
2.95
2.85
3.15
VOUT = 5.0 V
−40 0 25 50 75
VOUT [V]
5.3
5.0
4.9
4.7
Ta [°C]
5.2
−25 85
5.1
4.8
(6) Current Consumption vs. Input Voltage
VOUT = 1.2 V VOUT = 3.0 V
02 567
ISS1 [μA]
35
25
10
0
VIN [V]
134
40
30
20
15
5
85
°C
25
°C
−40
°C
02 567
ISS1 [μA]
35
25
10
0
VIN [V]
134
40
30
20
15
5
85
°C
25
°C
−40
°C
VOUT = 5.0 V
02 567
ISS1 [μA]
35
25
10
0
VIN [V]
134
40
30
20
15
5
85
°C
25
°C
−40
°C
SUPER-SMALL PACKAGE 2-CIRCUIT HIGH RIPPLE-REJECTION LOW CURRENT CONSUMPTION LOW DROPOUT CMOS VOLTAGE REGULATOR
S-1721 Series Rev.2.0_00
Seiko Instruments Inc.
28
(7) Ripple Rejection (Ta = 25°C)
VOUT = 1.2 V
VIN = 2.2 V, CLn = 1.0 μF
VOUT = 3.0 V
VIN = 4.0 V, CLn = 1.0 μF
!"
# $%
!"
#&$%
!"
#$%
!"
# $%
!"
#&$%
!"
#$%
VOUT = 5.0 V
VIN = 6.0 V, CLn = 1.0 μF
!"
# $%
!"
#&$%
!"
#$%
Remark CLn: Capacitor set to VOUTn pin externally (n = 1, 2)
SUPER-SMALL PACKAGE 2-CIRCUIT HIGH RIPPLE-REJECTION LOW CURRENT CONSUMPTION LOW DROPOUT CMOS VOLTAGE REGULATOR
Rev.2.0_00 S-1721 Series
Seiko Instruments Inc. 29
Reference Data (Per Circuit)
(1) Transient Response Characteristics when Input (Ta = 25°C) Common to VR1 and VR2
VOUT = 1.2 V
IOUT = 30 mA, tr = tf = 5.0 μs, CLn = 1.0 μF, CIN = 1.0 μF
VOUT = 3.0 V
IOUT = 30 mA, tr = tf = 5.0 μs, CLn = 1.0 μF, CIN = 1.0 μF
V
OUT
[V]
1.30
1.28
1.26
1.24
1.22
1.20
1.18
1.16
1.14
t [μs]
V
IN
[V]
4.0
3.0
2.5
2.0
0
0.5
1.0
1.5
3.5
−50 200 3000 50 100 150 250 350−100
V
OUT
V
IN
V
OUT
[V]
3.10
3.08
3.06
3.04
3.02
3.00
2.98
2.96
t [μs]
V
IN
[V]
7.0
5.0
4.0
0
1.0
2.0
3.0
6.0
−50 200 3000 50 100 150 250 350−100
V
OUT
V
IN
VOUT = 5.0 V
IOUT = 30 mA, tr = tf = 5.0 μs, CLn = 1.0 μF, CIN = 1.0 μF
V
OUT
[V]
5.04
5.03
5.02
5.01
5.00
4.99
4.98
4.97
t [μs]
V
IN
[V]
7.0
6.0
5.5
3.5
4.0
4.5
5.0
6.5
−50 200 3000 50 100 150 250 350−100
V
OUT
V
IN
(2) Transient Response Characteristics of Load (Ta = 25°C)
VOUT = 1.2 V
VIN = 2.2 V, CLn = 1.0 μF, CIN = 1.0 μF, IOUT = 10 ↔ 50 mA
VOUT = 1.2 V
VIN = 2.2 V, CLn = 1.0 μF, CIN = 1.0 μF, IOUT = 10 ↔ 100 mA
V
OUT
[V]
1.46
1.42
1.34
1.30
1.26
1.22
1.14
1.10
t [μs]
I
OUT
[mA]
100
25
0
−150
−125
−50
−25
75
−50 200 3000 50 100 150 250 350−100
50
−100
1.18
1.38
V
OUT
I
OUT
V
OUT
[V]
1.42
1.38
1.30
1.26
1.22
1.18
1.10
1.06
t [μs]
I
OUT
[mA]
200
50
0
−250
−200
−100
−50
150
−50 200 3000 50 100 150 250 350−100
V
OUT
I
OUT
100
−150
1.14
1.34
VOUT = 3.0 V
VIN = 4.0 V, CLn = 1.0 μF, CIN = 1.0 μF, IOUT = 10 ↔ 50 mA
VOUT = 3.0 V
VIN = 4.0 V, CLn = 1.0 μF, CIN = 1.0 μF, IOUT = 10 ↔ 100 mA
V
OUT
[V]
3.25
3.20
3.10
3.05
3.00
2.95
2.85
2.80
t [μs]
I
OUT
[mA]
100
25
0
−125
−100
−50
−25
75
−50 200 3000 50 100 150 250 350−100
50
−75
2.90
3.15
V
OUT
I
OUT
VOUT [V]
3.25
3.20
3.10
3.05
3.00
2.95
2.85
2.80
t [μs]
IOUT [mA]
200
50
0
−250
−200
−100
−50
150
−50 200 3000 50 100 150 250 350−100
100
−150
2.90
3.15
VOUT
IOUT
Remark CLn: Capacitor set to VOUTn pin externally (n = 1, 2)
SUPER-SMALL PACKAGE 2-CIRCUIT HIGH RIPPLE-REJECTION LOW CURRENT CONSUMPTION LOW DROPOUT CMOS VOLTAGE REGULATOR
S-1721 Series Rev.2.0_00
Seiko Instruments Inc.
30
VOUT = 5.0 V
VIN = 6.0 V, CLn = 1.0 μF, CIN = 1.0 μF, IOUT = 10 ↔ 50 mA
VOUT = 5.0 V
VIN = 6.0 V, CLn = 1.0 μF, CIN = 1.0 μF, IOUT = 10 ↔ 100 mA
V
OUT
[V]
5.50
5.40
5.20
5.10
5.00
4.90
4.70
4.60
t [μs]
I
OUT
[mA]
100
25
0
−125
−100
−50
−25
75
−50 200 3000 50 100 150 250 350−100
50
−75
4.80
5.30
V
OUT
I
OUT
VOUT [V]
5.50
5.40
5.20
5.10
5.00
4.90
4.70
4.60
t [μs]
IOUT [mA]
200
50
0
−250
−200
−100
−50
150
−50 200 3000 50 100 150 250 350−100
100
−150
4.80
5.30
VOUT
IOUT
(3) Transient Response Characteristics of ON/OFF Pin (Ta = 25°C)
VOUT = 1.2 V
VIN = 2.2 V, tr = 5.0 μs, CLn = 1.0 μF, CIN = 1.0 μF, IOUT = 100 mA
VOUT = 3.0 V
VIN = 4.0 V, tr = 5.0 μs, CLn = 1.0 μF, CIN = 1.0 μF, IOUT = 100 mA
V
OUT
[V]
1.2
0.8
0.4
0
t [μs]
V
ON / OFF
[V]
4.0
2.0
0
0 50 100 150 200
V
OUT
V
ON / OFF
1.6
2.0
2.4
−2.0
−4.0
−6.0
−8.0
V
OUT
[V]
3.0
2.0
1.0
0
t [μs]
V
ON / OFF
[V]
6.0
4.0
0
0 50 100 150 200
V
OUT
V
ON / OFF
2.0
4.0
5.0
6.0
7.0
−2.0
−4.0
−6.0
−8.0
VOUT = 5.0 V
VIN = 6.0 V, tr = 5.0 μs, CLn = 1.0 μF, CIN = 1.0 μF, IOUT = 100 mA
V
OUT
[V]
3.0
2.0
1.0
0
t [μs]
V
ON / OFF
[V]
8.0
4.0
0
0 50 100 150 200
2.0
4.0
5.0 V
OUT
V
ON / OFF
6.0
6.0
7.0
8.0
9.0
10.0
−2.0
−4.0
−6.0
−8.0
−10.0
−12.0
Remark CLn: Capacitor set to VOUTn pin externally (n = 1, 2)
SUPER-SMALL PACKAGE 2-CIRCUIT HIGH RIPPLE-REJECTION LOW CURRENT CONSUMPTION LOW DROPOUT CMOS VOLTAGE REGULATOR
Rev.2.0_00 S-1721 Series
Seiko Instruments Inc. 31
(4) Transient Response Characteristics of Load’s Mutual Interference (Ta = 25°C)
VOUT1 = VOUT2 = 1.2 V
VIN = 2.2 V, CL1 = CL2 = 1.0 μF, CIN = 1.0 μF,
IOUT1 = 10 ↔ 100 mA, IOUT2 = no load
VOUT1 = VOUT2 = 3.0 V
VIN = 4.0 V, CL1 = CL2 = 1.0 μF, CIN = 1.0 μF,
IOUT1 = 10 ↔ 100 mA, IOUT2 = no load
V
OUT1
[V]
1.26
1.22
1.18
1.10
1.06
t [μs]
−50 200 3000 50 100 150 250 350−100
1.14 V
OUT1
V
OUT2
[V]
1.30
1.26
1.22
1.18
1.14
V
OUT2
I
OUT1
[mA]
150
0
−50
100
50
I
OUT1
V
OUT1
[V]
3.05
3.00
2.95
2.85
2.80
t [μs]
−50 200 3000 50 100 150 250 350−100
2.90
V
OUT2
[V]
3.10
3.05
3.00
2.95
2.90
V
OUT2
I
OUT1
[mA]
150
0
−50
100
50
I
OUT1
V
OUT1
VOUT1 = VOUT2 = 5.0 V
VIN = 6.0 V, CL1 = CL2 = 1.0 μF, CIN = 1.0 μF,
IOUT1 = 10 ↔ 100 mA, IOUT2 = no load
V
OUT1
[V]
5.10
5.00
4.90
4.70
4.60
t [μs]
−50 200 3000 50 100 150 250 350−100
4.80
V
OUT2
[V]
5.20
5.10
5.00
4.90
4.80
V
OUT2
I
OUT1
[mA]
150
0
−50
100
50
I
OUT1
V
OUT1
(5) Example of Equivalent Series Resistance vs. Output Current Characteristics (Ta = 25°C)
100
0 150
IOUT [mA]
RESR [Ω]
CIN = CLn = 1.0
μ
F
0.01
Stable
Remark CLn: Capacitor set to VOUTn pin externally (n = 1, 2)
SUPER-SMALL PACKAGE 2-CIRCUIT HIGH RIPPLE-REJECTION LOW CURRENT CONSUMPTION LOW DROPOUT CMOS VOLTAGE REGULATOR
S-1721 Series Rev.2.0_00
Seiko Instruments Inc.
32
Marking Specifications
(1) SNT-6A
(1) to (3) : Product code (Refer to Product name vs. Product code)
(4) to (6) : Lot number
SNT-6A
Top view
1
2
3 4
6
5
(1)
(4)
(2)
(5)
(3)
(6)
Product name vs. Product code
(a) S-1721 Series A type
Product code Product code
Product Name (1) (2) (3) Product Name (1) (2) (3)
S-1721A1212-I6T1x S 2 B S-1721A2515-I6T1x S 6 P
S-1721A1215-I6T1x S 2 D S-1721A2518-I6T1x S 2 Z
S-1721A1218-I6T1x S 2 S S-1721A2525-I6T1x S 6 Q
S-1721A1225-I6T1x S 6 D S-1721A2528-I6T1x S 6 R
S-1721A1226-I6T1x S 6 7 S-1721A252J-I6T1x S 6 S
S-1721A1228-I6T1x S 6 E S-1721A2530-I6T1x S 6 T
S-1721A122J-I6T1x S 6 F S-1721A2533-I6T1x S 6 U
S-1721A1230-I6T1x S 6 G S-1721A2613-I6T1x S 6 A
S-1721A1233-I6T1x S 2 N S-1721A2812-I6T1x S 6 B
S-1721A1C18-I6T1x S 2 W S-1721A2815-I6T1x S 2 H
S-1721A1512-I6T1x S 6 H S-1721A2818-I6T1x S 2 I
S-1721A1513-I6T1x S 2 P S-1721A2825-I6T1x S 6 V
S-1721A1515-I6T1x S 2 Q S-1721A2826-I6T1x S 2 8
S-1721A1518-I6T1x S 6 I S-1721A2828-I6T1x S 2 A
S-1721A1525-I6T1x S 6 J S-1721A282J-I6T1x S 6 W
S-1721A152J-I6T1x S 6 K S-1721A2830-I6T1x S 6 X
S-1721A1530-I6T1x S 6 L S-1721A2833-I6T1x S 6 C
S-1721A1533-I6T1x S 6 M S-1721A2J12-I6T1x S 6 9
S-1721A1812-I6T1x S 2 T S-1721A2J15-I6T1x S 7 A
S-1721A1815-I6T1x S 6 N S-1721A2J18-I6T1x S 2 V
S-1721A1818-I6T1x S 2 X S-1721A2J2J-I6T1x S 2 J
S-1721A1825-I6T1x S 2 F S-1721A2J33-I6T1x S 6 8
S-1721A1826-I6T1x S 2 7 S-1721A3018-I6T1x S 2 6
S-1721A1828-I6T1x S 2 G S-1721A3028-I6T1x S 6 Y
S-1721A1829-I6T1x S 6 4 S-1721A3030-I6T1x S 2 K
S-1721A182J-I6T1x S 2 U S-1721A3033-I6T1x S 6 Z
S-1721A1830-I6T1x S 2 3 S-1721A3119-I6T1x S 2 L
S-1721A1833-I6T1x S 2 2 S-1721A3318-I6T1x S 2 M
S-1721A2020-I6T1x S 2 C S-1721A3330-I6T1x S 6 2
S-1721A2121-I6T1x S 2 R S-1721A3333-I6T1x S 2 O
S-1721A2512-I6T1x S 6 O
Remark 1. Please contact our sales office for products with specifications other than the above.
2. x: G or U
3. Please select products of environmental code = U for Sn 100%, halogen-free products.
SUPER-SMALL PACKAGE 2-CIRCUIT HIGH RIPPLE-REJECTION LOW CURRENT CONSUMPTION LOW DROPOUT CMOS VOLTAGE REGULATOR
Rev.2.0_00 S-1721 Series
Seiko Instruments Inc. 33
(b) S-1721 Series B type (e) S-1721 Series E type
Product code Product code
Product Name (1) (2) (3) Product Name (1) (2) (3)
S-1721B1515-I6T1x S 3 A S-1721E1328-I6T1x S 5 A
S-1721B1518-I6T1x S 3 B S-1721E1528-I6T1x S 5 B
S-1721B1812-I6T1x S 3 C S-1721E1828-I6T1x S 5 D
S-1721B1818-I6T1x S 3 D S-1721E1833-I6T1x S 5 L
S-1721B2818-I6T1x S 3 E S-1721E2518-I6T1x S 5 E
S-1721B2J2J-I6T1x S 3 F S-1721E2525-I6T1x S 5 F
S-1721E2530-I6T1x S 5 O
(c) S-1721 Series C type S-1721E2818-I6T1x S 5 G
Product code S-1721E2833-I6T1x S 5 H
Product Name (1) (2) (3) S-1721E2J25-I6T1x S 5 K
S-1721C2J2J-I6T1x S 4 A S-1721E2J2J-I6T1x S 5 I
S-1721E3012-I6T1x S 5 S
(d) S-1721 Series D type S-1721E3025-I6T1x S 5 P
Product code S-1721E3033-I6T1x S 5 J
Product Name (1) (2) (3)
S-1721D1818-I6T1x S 4 T
S-1721D3318-I6T1x S 4 S
Remark 1. Please contact our sales office for products with specifications other than the above.
2. x: G or U
3. Please select products of environmental code = U for Sn 100%, halogen-free products.
SUPER-SMALL PACKAGE 2-CIRCUIT HIGH RIPPLE-REJECTION LOW CURRENT CONSUMPTION LOW DROPOUT CMOS VOLTAGE REGULATOR
S-1721 Series Rev.2.0_00
Seiko Instruments Inc.
34
(2) SOT-23-6
(1) to (3) : Product code (Refer to Product name vs. Product code)
(4) : Lot number
6 4
1 3
2
(1) (2) (3) (4)
SOT-23-6
To
p
view
5
Product name vs. Product code
(a) S-1721 Series A type
Product code Product code
Product Name (1) (2) (3) Product Name (1) (2) (3)
S-1721A1212-M6T1x S 2 B S-1721A2518-M6T1x S 2 Z
S-1721A1215-M6T1x S 2 D S-1721A2528-M6T1x S 6 R
S-1721A1228-M6T1x S 6 E S-1721A2812-M6T1x S 6 B
S-1721A1233-M6T1x S 2 N S-1721A2815-M6T1x S 2 H
S-1721A1328-M6T1x S 2 4 S-1721A2818-M6T1x S 2 I
S-1721A1330-M6T1x S 2 E S-1721A2828-M6T1x S 2 A
S-1721A1528-M6T1x S 2 Y S-1721A2830-M6T1x S 6 X
S-1721A1530-M6T1x S 6 L S-1721A2833-M6T1x S 6 C
S-1721A1533-M6T1x S 6 M S-1721A2J2J-M6T1x S 2 J
S-1721A1825-M6T1x S 2 F S-1721A3312-M6T1x S 2 9
S-1721A1828-M6T1x S 2 G S-1721A3318-M6T1x S 2 M
S-1721A1830-M6T1x S 2 3 S-1721A3328-M6T1x S 6 3
S-1721A1833-M6T1x S 2 2 S-1721A3333-M6T1x S 2 O
S-1721A2020-M6T1x S 2 C
(b) S-1721 Series B type (e) S-1721 Series E type
Product code Product code
Product Name (1) (2) (3) Product Name (1) (2) (3)
S-1721B2828-M6T1x S 3 G S-1721E1528-M6T1x S 5 B
S-1721E1825-M6T1x S 5 U
(c) S-1721 Series C type S-1721E1826-M6T1x S 5 C
Product code S-1721E1828-M6T1x S 5 D
Product Name (1) (2) (3) S-1721E1830-M6T1x S 5 Q
S-1721C2J2J-M6T1x S 4 A S-1721E1833-M6T1x S 5 L
S-1721E2025-M6T1x S 5 T
(d) S-1721 Series D type S-1721E2813-M6T1x S 5 M
Product code S-1721E2818-M6T1x S 5 G
Product Name (1) (2) (3) S-1721E2833-M6T1x S 5 H
S-1721D1828-M6T1x S 4 R S-1721E2J25-M6T1x S 5 K
S-1721D3318-M6T1x S 4 S S-1721E3312-M6T1x S 5 N
Remark 1. Please contact our sales office for products with specifications other than the above.
2. x: G or U
3. Please select products of environmental code = U for Sn 100%, halogen-free products.
No.
TITLE
SCALE
UNIT mm
Seiko Instruments Inc.
SNT-6A-A-PKG Dimensions
PG006-A-P-SD-2.0
No. PG006-A-P-SD-2.0
0.2±0.05
0.48±0.02
0.08 +0.05
-0.02
0.5
1.57±0.03
123
45
6
Feed direction
4.0±0.1
2.0±0.05
4.0±0.1
ø1.5 +0.1
-0
ø0.5
1.85±0.05 0.65±0.05
0.25±0.05
5°
No.
TITLE
SCALE
UNIT mm
Seiko Instruments Inc.
PG006-A-C-SD-1.0
SNT-6A-A-Carrier Tape
No. PG006-A-C-SD-1.0
+0.1
-0
1
2
4
3
56
12.5max.
9.0±0.3
ø13±0.2
(60°) (60°)
QTY.
No. PG006-A-R-SD-1.0
PG006-A-R-SD-1.0
Enlarged drawing in the central part
No.
TITLE
SCALE
UNIT mm
Seiko Instruments Inc.
SNT-6A-A-Reel
5,000
No.
TITLE
SCALE
UNIT mm
SNT-6A-A-Land Recommendation
Seiko Instruments Inc.
PG006-A-L-SD-3.0
No. PG006-A-L-SD-3.0
0.3
0.20.3
0.20.3
0.52
1.36
0.52
Caution Making the wire pattern under the package is possible. However, note that the package
may be upraised due to the thickness made by the silk screen printing and of a solder
resist on the pattern because this package does not have the standoff.
2.9±0.2
0.15
1.9±0.2
123
4
65
0.35±0.15
0.95
+0.1
-0.05
0.95
No.
TITLE
SCALE
UNIT mm
Seiko Instruments Inc.
No. MP006-A-P-SD-1.1
MP006-A-P-SD-1.1
SOT236-A-PKG Dimensions
No.
TITLE
SCALE
UNIT mm
123
45
6
ø1.5 +0.1
-0 2.0±0.05
ø1.0 +0.2
-0 4.0±0.1
1.4±0.2
0.25±0.1
3.2±0.2
Seiko Instruments Inc.
No. MP006-A-C-SD-3.1
MP006-A-C-SD-3.1
SOT236-A-Carrier Tape
Feed direction
4.0±0.1(10 pitches:40.0±0.2)
No.
TITLE
SCALE
UNIT mm
12.5max.
9.0±0.3
ø13±0.2
(60°) (60°)
QTY 3,000
Seiko Instruments Inc.
Enlarged drawing in the central part
No. MP006-A-R-SD-2.1
MP006-A-R-SD-2.1
SOT236-A-Reel
www.sii-ic.com
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