Contents
Features.............................................................................................. 1
Applications......................................................................................... 1
Pin Assignment ................................................................................... 1
Block Diagram..................................................................................... 1
Selection Guide................................................................................... 2
Absolute Maximum Ratings................................................................. 2
Electrical Characteristics ..................................................................... 3
Test Circuits ........................................................................................ 11
Technical Terms.................................................................................. 12
Operation............................................................................................. 13
Transient Response ............................................................................ 14
Standard Circuit................................................................................... 17
Application Circuits.............................................................................. 17
Notes on Design.................................................................................. 19
Dimensions.......................................................................................... 20
Markings.............................................................................................. 20
Package Power Dissipation................................................................. 21
Taping Dimensions.............................................................................. 22
Characteristics..................................................................................... 25
Measuring Circuits............................................................................... 31
Frequently Asked Questions................................................................ 32
Seiko Instruments Inc. 1
The S-812XXSG Series is a three-terminal positive voltage regulator
made using the CMOS process. Since the S-812XXSG Series has
higher precision output voltage and consumes less current than existing
three-terminal voltage regulators, battery-powered portable equipment
can have a higher performance and a longer serv ic e lif e.
Applications
Constant voltage power supply of batter y-powered equipm ent, com munications equipment, video equipment
and others
Pin Assignment
HIGH-PRECISION
VOLTAGE REGULAT OR S-812XXSG Series
Features
Low power consumption (2.5
A max. )
High accuracy of output voltage
±2% : VOUT
2.7 V
±2.4% : VOUT
2.6 V
Small input / out put voltage diff er ence
(S-81250SG: 160 mV typ. IOUT=10 mA)
Low temperature coeff icient of output voltage
(S-81250SG: ±0.625 mV/
C typ.)
Wide oper at ing volt age r ange
(S-81250SG: 16 V max.)
Good line regulation
(S-81250SG: 40 mV typ. IOUT=1
A to 40 mA)
TO-92, SO T- 89- 3 and SOT-23-5 pack age
Block Diagram
Figure 1
RL
GND
VIN VOUT
2
+
-
*
Ref.
vol.
3
1
* Parasitic diode
Bottom view
1 2 3
(
1
)
TO-92
1GND
2V
IN
3V
OUT
Top view
1 2 3
1GND
2V
IN
3V
OUT
(2) SOT-89-3
GND VIN VOUT
NC NC
Top View
(3) SOT-23-5
Figure 2
HIGH PRECISION VOLTAGE REGULA TOR
S-812XXSG Series
2 Seiko Instruments Inc.
Selection Guide
Table 1
Output voltage TO-92 *1 SOT-89-3 *2 SOT-23-5 *2
1.1
2.4% S-81211SGY-X S-81211SGUP-DQA-X S-81211SG-QA-X
1.5
2.4% S-81215SGY-X S-81215SGUP-DQK-X S-81215SG-QK-X
1.7
2.4% S-81217SG-QQ-X
1.8
2.4% S-81218SG-QR-X
2.0
2.4% S-81220SGY-X S-81220SGUP-DQS-X S-81220SG-QS-X
2.1
2.4% S-81221SGUP-DQU-X
2.3
2.4% S-81223SGY-X S-81223SG-QW-X
2.4
2.4% S-81224SGY-X S-81224SGUP-DQX-X S-81224SG-QX-X
2.5
2.4% S-81225SGY-X S-81225SGUP-DQH-X S-81225SG-QH-X
2.7
2.0% S-81227SGUP-DQZ-X
3.0
2.0% S-81230SGY-X S-81230SGUP-DQB-X S-81230SG-QB-X
3.3
2.0% S-81233SGY-X S-81233SGUP-DQF-X S-81233SG-QF-X
3.5
2.0% S-81235SGY-X S-81235SGUP-DQI-X S-81235SG-QI-X
3.6
2.0% S-81236SGUP-DQ7-X
3.7
2.0% S-81237SGY-X S-81237SGUP-DQE-X S-81237SG-QE-X
4.0
2.0% S-81240SGY-X S-81240SGUP-DQJ-X S-81240SG-QJ-X
4.2
2.0% S-81242SG-IB-X
4.5
2.0% S-81245SGY-X S-81245SGUP-DQ5-X S-81245SG-Q5-X
4.6
2.0% S-81246SGY-X S-81246SGUP-DQM-X S-81246SG-QM-X
4.7
2.0% S-81247SG-IE-X
5.0
2.0% S-81250SGY-X S-81250SGUP-DQD-X S-81250SG-QD-X
5.2
2.0% S-81252SGY-X S-81252SGUP-DQL-X S-81252SG-QL-X
5.3
2.0% S-81253SGUP-DIJ-X
5.4
2.0% S-81254SGUP-DIK-X
5.5
2.0% S-81255SGUP-DIL-X
5.6
2.0% S-81256SGUP-DIM-X
*1 In the TO-92 package, “x” differs depending upon the packaging form:
B : Loose
T, Z : Tape
*2 In the SOT package, “x” differs depending upon the packaging form (in the SOT-23-5 package, on-tape
packed products only):
S : Stick
T : Tape (T1 and T2 are available depending upon the direction of the IC)
Absolute Maximum Ratings Table 2 (Unless otherwise specified: Ta=25
C)
Parameter Symbol Conditions Ratings Unit
VOUT
2.6 V 12 V
Input voltage VIN VOUT
2.7 V 18
Output voltage VOUT VIN+0.3 to VSS-0.3 V
Output current IOUT 100 mA
TO-92 400
Power dissipation PDSOT-89-3 500 mW
SOT-23-5 150
Operating temperature Topr -40 to +85
C
Storage temperature Tstg -40 to +125
C
Caution: Keep static electricity to a minimum.
HIGH-PRECISION VOLTAGE REGULAT OR
S-812XXSG Series
Seiko Instruments Inc. 3
Electrical Characteri sti cs
1. S-81211SGY-X, S-81211SG UP- DQA-X, S-81211SG-QA-X (1.1-V out put type)
Parameter Symbol Conditions Min. Typ. Max. Unit Test cir.
Output voltage VOUT VIN =1.5 V, IOUT =0.5 mA 1.073 1.100 1.127 V 1
I/O voltage difference Vdif IOUT=0.5 mA
0.05 0.2 V 1
Line regulation 1
VOUT1VIN =1.5 to 10 V
IOUT=0.5 mA
10 50 mV 1
Line regulation 2
VOUT2VIN =1.5 to 10 V
IOUT=10
A
10 77 mV 1
Load regulation
VOUT3VIN =1.5 V
IOUT=10
A to 0.5 mA
10 100 mV 1
Current consumption ISS VIN =1.5 V, Unloaded
1.2 2.5
A2
Input voltage VIN
10 V
Temperature charac-
teristic of
VOUT
VOUT
Ta VIN=1.5 V, IOUT = 0.5 mA
Ta=-40
C to 85
C
±0.138
mV/
C
2. S-81215SGY-X, S- 81215SGUP-DQK-X, S-81215SG-QK-X (1.5- V out put type)
Parameter Symbol Conditions Min. Typ. Max. Unit Test cir.
Output voltage VOUT VIN =3.5 V, IOUT =0.5 mA 1.464 1.500 1.536 V 1
I/O voltage difference Vdif IOUT=0.5 mA
0.03 0.18 V 1
Line regulation 1
VOUT1VIN =2.5 to 10 V
IOUT=0.5 mA
739mV1
Line regulation 2
VOUT2VIN =2.5 to 10 V
IOUT=1
A
7 105 mV 1
Load regulation
VOUT3VIN =3.5 V
IOUT=1
A to10 mA
80 120 mV 1
Current consumption ISS VIN =3.5 V, Unloaded
1.2 2.5
A2
Input voltage VIN
10 V
Temperature charac-
teristic of
VOUT
VOUT
Ta VIN=3.5 V, IOUT = 0.5 mA
Ta=-40
C to 85
C
±0.188
mV/
C
3. S-81217SG- QQ-X ( 1. 7 - V out put type)
Parameter Symbol Conditions Min. Typ. Max. Unit Test cir.
Output voltage VOUT VIN =3.7 V, IOUT =10 mA 1.659 1.700 1.741 V 1
I/O voltage difference Vdif IOUT=10 mA
0.77 1.63 V 1
Line regulation 1
VOUT1VIN =2.7 to 10 V
IOUT=1 mA
843mV1
Line regulation 2
VOUT2VIN =2.7 to 10 V
IOUT=1
A
8 119 mV 1
Load regulation
VOUT3VIN =3.7 V
IOUT=1
A to 10 mA
80 120 mV 1
Current consumption ISS VIN =3.7 V, Unloaded
1.2 2.5
A2
Input voltage VIN
10 V
Temperature charac-
teristic of
VOUT
VOUT
Ta VIN=3.7 V, IOUT = 10 mA
Ta=-40
C to 85
C
±0.213
mV/
C
Table 3
(
Unless otherwise specified: Ta=25
C
)
Table 4
(
Unless otherwise specified: Ta=25
C
)
Table 5
(
Unless otherwise specified: Ta=25
C
)
HIGH PRECISION VOLTAGE REGULA TOR
S-812XXSG Series
4 Seiko Instruments Inc.
4. S-81218SG-Q R- X ( 1.8-V output type)
Parameter Symbol Conditions Min. Typ. Max. Unit Test cir.
Output voltage VOUT VIN =3.8 V, IOUT =10 mA 1.756 1.800 1.843 V 1
I/O voltage difference Vdif IOUT=10 mA
0.72 1.55 V 1
Line regulation 1
VOUT1VIN =2.8 to 10 V
IOUT=1 mA
845mV1
Line regulation 2
VOUT2VIN =2.8 to 10 V
IOUT=1
A
8 126 mV 1
Load regulation
VOUT3VIN =3.8 V
IOUT=1
A to 10 mA
80 120 mV 1
Current consumption ISS VIN =3.8 V, Unloaded
1.2 2.5
A2
Input voltage VIN
10 V
Temperature charac-
teristic of
VOUT
VOUT
Ta VIN=3.8 V, IOUT = 10 mA
Ta=-40
C to 85
C
±0.225
mV/
C
5. S-81220SGY-X, S-81220SG UP- DQS-X, S- 81220SG - QS-X (2.0-V output type)
Parameter Symbol Conditions Min. Typ. Max. Unit Test cir.
Output voltage VOUT VIN =4.0 V, IOUT =10 mA 1.592 2.000 2.048 V 1
I/O voltage difference Vdif IOUT=10 mA
0.63 1.39 V 1
Line regulation 1
VOUT1VIN =3.0 to 10 V
IOUT=1 mA
848mV1
Line regulation 2
VOUT2VIN =3.0 to 10 V
IOUT=1
A
8 140 mV 1
Load regulation
VOUT3VIN =4.0 V
IOUT=1
A to 10 mA
80 120 mV 1
Current consumption ISS VIN =4.0 V, Unloaded
1.2 2.5
A2
Input voltage VIN
10 V
Temperature charac-
teristic of
VOUT
VOUT
Ta VIN=4.0 V, IOUT = 10 mA
Ta=-40
C to 85
C
±0.250
mV/
C
6. S-81221SGUP-DQU-X (2.1-V output t ype)
Parameter Symbol Conditions Min. Typ. Max. Unit Test cir.
Output voltage VOUT VIN =4.1 V, IOUT =10 mA 2.049 2.100 2.151 V 1
I/O voltage difference Vdif IOUT=10 mA
0.59 1.32 V 1
Line regulation 1
VOUT1VIN =3.1 to 10 V
IOUT=1 mA
950mV1
Line regulation 2
VOUT2VIN =3.1 to 10 V
IOUT=1
A
9 147 mV 1
Load regulation
VOUT3VIN =4.1 V
IOUT=1
A to 10 mA
80 120 mV 1
Current consumption ISS VIN =4.1 V, Unloaded
1.2 2.5
A2
Input voltage VIN
10 V
Temperature charac-
teristic of
VOUT
VOUT
Ta VIN=4.1 V, IOUT = 10 mA
Ta=-40
C to 85
C
±0.263
mV/
C
Table 6 (Unless otherwise specified: Ta=25
C)
Table 7 (Unless otherwise specified: Ta=25
C)
Table 8 (Unless otherwise specified: Ta=25
C)
HIGH-PRECISION VOLTAGE REGULAT OR
S-812XXSG Series
Seiko Instruments Inc. 5
7. S-81223SGY-X, S-81223SG -QW-X (2.3 - V out put type)
Parameter Symbol Conditions Min. Typ. Max. Unit Test cir.
Output voltage VOUT VIN =4.3 V, IOUT =10 mA 2.244 2.300 2.356 V 1
I/O voltage difference Vdif IOUT=10 mA
0.53 1.20 V 1
Line regulation 1
VOUT1VIN =3.3 to 10 V
IOUT=1 mA
954mV1
Line regulation 2
VOUT2VIN =3.3 to 10 V
IOUT=1
A
9 161 mV 1
Load regulation
VOUT3VIN =4.3 V
IOUT=1
A to 10 mA
80 120 mV 1
Current consumption ISS VIN =4.3 V, Unloaded
1.2 2.5
A2
Input voltage VIN
10 V
Temperature charac-
teristic of
VOUT
VOUT
Ta VIN=4.3 V, IOUT = 10 mA
Ta=-40
C to 85
C
±0.288
mV/
C
8. S-81224SGY-X, S-81224SG UP- DQX-X, S- 81224SG - QX-X (2.4-V output type)
Parameter Symbol Conditions Min. Typ. Max. Unit Test cir.
Output voltage VOUT VIN =4.4 V, IOUT =10 mA 2.342 2.400 2.458 V 1
I/O voltage difference Vdif IOUT=10 mA
0.49 1.15 V 1
Line regulation 1
VOUT1VIN =3.4 to 10 V
IOUT=1 mA
10 55 mV 1
Line regulation 2
VOUT2VIN =3.4 to 10 V
IOUT=1
A
10 168 mV 1
Load regulation
VOUT3VIN =4.4 V
IOUT=1
A to 10 mA
80 120 mV 1
Current consumption ISS VIN =4.4 V, Unloaded
1.2 2.5
A2
Input voltage VIN
10 V
Temperature charac-
teristic of
VOUT
VOUT
Ta VIN=4.4 V, IOUT = 10 mA
Ta=-40
C to 85
C
±0.300
mV/
C
9. S-81225SGY-X, S-81225SG UP- DQH-X, S- 81225SG - QH-X (2.5- V out put type)
Parameter Symbol Conditions Min. Typ. Max. Unit Test cir.
Output voltage VOUT VIN =4.5 V, IOUT =10 mA 2.440 2.500 2.560 V 1
I/O voltage difference Vdif IOUT=10 mA
0.59 1.32 V 1
Line regulation 1
VOUT1VIN =3.5 to 10 V
IOUT=1 mA
10 57 mV 1
Line regulation 2
VOUT2VIN =3.5 to 10 V
IOUT=1
A
10 175 mV 1
Load regulation
VOUT3VIN =4.5 V
IOUT=1
A to 10 mA
80 120 mV 1
Current consumption ISS VIN =4.5 V, Unloaded
1.2 2.5
A2
Input voltage VIN
10 V
Temperature charac-
teristic of
VOUT
VOUT
Ta VIN=4.5 V, IOUT = 10 mA
Ta=-40
C to 85
C
±0.313
mV/
C
Table 9 (Unless otherwise specified: Ta=25
C)
Table 10 (Unless otherwise specified: Ta=25
C)
Table 11 (Unless otherwise specified: Ta=25
C)
HIGH-PRECISION VOLTAGE REGULAT OR
S-812XXSG Series
6 Seiko Instruments Inc.
10. S-81227SG UP- DQ Z- X (2.7-V output type)
Parameter Symbol Conditions Min. Typ. Max. Unit Test cir.
Output voltage VOUT VIN =4.7 V, IOUT =10 mA 2.646 2.700 2.754 V 1
I/O voltage difference Vdif IOUT=10 mA
0.52 1.20 V 1
Line regulation 1
VOUT1VIN =3.7 to 16 V
IOUT=1 mA
36 72 mV 1
Line regulation 2
VOUT2VIN =3.7 to 16 V
IOUT=1
A
36 189 mV 1
Load regulation
VOUT3VIN =4.7 V
IOUT=1
A to 20 mA
80 120 mV 1
Current consumption ISS VIN =4.7 V, Unloaded
1.2 2.5
A2
Input voltage VIN
16 V
Temperature charac-
teristic of
VOUT
VOUT
Ta VIN=4.7 V, IOUT = 10 mA
Ta=-40
C to 85
C
±0.338
mV/
C
11. S-81230SG Y-X, S- 81230SGUP-DQB-X, S-81230SG-QB- X ( 3.0-V output type)
Parameter Symbol Conditions Min. Typ. Max. Unit Test
cir.
Output voltage VOUT VIN =5.0 V, IOUT =10 mA 2.940 3.000 3.060 V 1
I/O voltage difference Vdif IOUT=10 mA
0.44 1.04 V 1
Line regulation 1
VOUT1VIN =4.0 to 16 V
IOUT=1 mA
39 78 mV 1
Line regulation 2
VOUT2VIN =4.0 to 16 V
IOUT=1
A
39 210 mV 1
Load regulation
VOUT3VIN =5 V
IOUT=1
A to 20 mA
60 100 mV 1
Current consumption ISS VIN =5.0 V, Unloaded
1.2 2.5
A2
Input voltage VIN
16 V
Temperature charac-
teristic of
VOUT
VOUT
Ta VIN=5.0 V, IOUT = 10 mA
Ta=-40
C to 85
C
±0.375
mV/
C
12. S-81233SG Y-X, S- 81233SGUP-DQF-X, S-81233SG-QF-X (3.3-V out put type)
Parameter Symbol Conditions Min. Typ. Max. Unit Test
cir.
Output voltage VOUT VIN =5.3 V, IOUT =10 mA 3.234 3.300 3.366 V 1
I/O voltage difference Vdif IOUT=10 mA
0.37 0.91 V 1
Line regulation 1
VOUT1VIN =4.3 to 16 V
IOUT=1 mA
42 84 mV 1
Line regulation 2
VOUT2VIN =4.3 to 16 V
IOUT=1
A
42 231 mV 1
Load regulation
VOUT3VIN =5.3 V
IOUT=1
A to 20 mA
60 100 mV 1
Current consumption ISS VIN =5.3 V, Unloaded
1.2 2.5
A2
Input voltage VIN
16 V
Temperature charac-
teristic of
VOUT
VOUT
Ta VIN=5.3 V, IOUT = 10 mA
Ta=-40
C to 85
C
±0.413
mV/
C
Table 12 (Unless otherwise specified: Ta=25
C)
Table 13 (Unless otherwise specified: Ta=25
C)
Table 14 (Unless otherwise specified: Ta=25
C)
HIGH-PRECISION VOLTAGE REGULAT OR
S-812XXSG Series
Seiko Instruments Inc. 7
13. S-81235SG Y-X, S- 81235SGUP-DQI- X, S-81235SG-QI-X ( 3. 5-V output type)
Parameter Symbol Conditions Min. Typ. Max. Unit Test
cir.
Output voltage VOUT VIN =5.5 V, IOUT =10 mA 3.430 3.500 3.570 V 1
I/O voltage difference Vdif IOUT=10 mA
0.34 0.84 V 1
Line regulation 1
VOUT1VIN =4.5 to 16 V
IOUT=1 mA
44 88 mV 1
Line regulation 2
VOUT2VIN =4.5 to 16 V
IOUT=1
A
44 245 mV 1
Load regulation
VOUT3VIN =5.5 V
IOUT=1
A to 30 mA
60 100 mV 1
Current consumption ISS VIN =5.5 V, Unloaded
1.2 2.5
A2
Input voltage VIN
16 V
Temperature charac-
teristic of
VOUT
VOUT
Ta VIN=5.5 V, IOUT = 10 mA
Ta=-40
C to 85
C
±0.438
mV/
C
14. S-81236SGUP- DQ 7-X (3.6- V out put type)
Parameter Symbol Conditions Min. Typ. Max. Unit Test
cir.
Output voltage VOUT VIN =5.6 V, IOUT =10 mA 3.528 3.600 3.672 V 1
I/O voltage difference Vdif IOUT=16 mA
0.32 0.81 V 1
Line regulation 1
VOUT1VIN =4.6 to 16 V
IOUT=1 mA
45 90 mV 1
Line regulation 2
VOUT2VIN =4.6 to 16 V
IOUT=1
A
45 252 mV 1
Load regulation
VOUT3VIN =5.6 V
IOUT=1
A to 30 mA
60 100 mV 1
Current consumption ISS VIN =5.6 V, Unloaded
1.2 2.5
A2
Input voltage VIN
16 V
Temperature charac-
teristic of
VOUT
VOUT
Ta VIN=5.6 V, IOUT = 10 mA
Ta=-40
C to 85
C
±0.450
mV/
C
15. S-81237SG Y-X, S- 81237SG UP- DQE-X, S-81237SG-QE-X ( 3.7-V output type)
Parameter Symbol Conditions Min. Typ. Max. Unit Test
cir.
Output voltage VOUT VIN =5.7 V, IOUT =10 mA 3.626 3.700 3.774 V 1
I/O voltage difference Vdif IOUT=10 mA
0.31 0.78 V 1
Line regulation 1
VOUT1VIN =4.7 to 16 V
IOUT=1 mA
46 92 mV 1
Line regulation 2
VOUT2VIN =4.7 to 16 V
IOUT=1
A
46 259 mV 1
Load regulation
VOUT3VIN =5.7 V
IOUT=1
A to 30 mA
60 100 mV 1
Current consumption ISS VIN =5.7 V, Unloaded
1.2 2.5
A2
Input voltage VIN
16 V
Temperature charac-
teristic of
VOUT
VOUT
Ta VIN=5.7 V, IOUT = 10 mA
Ta=-40
C to 85
C
±0.463
mV/
C
Table 15 (Unless otherwise specified: Ta=25
C)
Table 17 (Unless otherwise specified: Ta=25
C)
Table 16 (Unless otherwise specified: Ta=25
C)
HIGH-PRECISION VOLTAGE REGULAT OR
S-812XXSG Series
8 Seiko Instruments Inc.
16. S-81240SG Y-X, S- 81240SGUP-DQJ-X, S-81240SG-QJ - X ( 4.0-V output t ype)
Parameter Symbol Conditions Min. Typ. Max. Unit Test
cir.
Output voltage VOUT VIN =6.0 V, IOUT =10 mA 3.920 4.000 4.080 V 1
I/O voltage difference Vdif IOUT=10 mA
0.27 0.70 V 1
Line regulation 1
VOUT1VIN =5.0 to 16 V
IOUT=1 mA
48 96 mV 1
Line regulation 2
VOUT2VIN =5.0 to 16 V
IOUT=1
A
48 280 mV 1
Load regulation
VOUT3VIN =6.0 V
IOUT=1
A to 30 mA
50 90 mV 1
Current consumption ISS VIN =6.0 V, Unloaded
1.2 2.5
A2
Input voltage VIN
16 V
Temperature charac-
teristic of
VOUT
VOUT
Ta VIN=6.0 V, IOUT = 10 mA
Ta=-40
C to 85
C
±0.500
mV/
C
17. S-81242SG- IB-X (4.2-V output type)
Parameter Symbol Conditions Min. Typ. Max. Unit Test
cir.
Output voltage VOUT VIN =6.2V, IOUT =10 mA 4.116 4.200 4.284 V 1
I/O voltage difference Vdif IOUT=10 mA
0.24 0.65 V 1
Line regulation 1
VOUT1VIN =5.2 to 16 V
IOUT=1 mA
50 100 mV 1
Line regulation 2
VOUT2VIN =5.2 to 16 V
IOUT=1
A
50 294 mV 1
Load regulation
VOUT3VIN =6.2 V
IOUT=1
A to 30 mA
50 90 mV 1
Current consumption ISS VIN =6.2 V, Unloaded
1.2 2.5
A2
Input voltage VIN
16 V
Temperature charac-
teristic of
VOUT
VOUT
Ta VIN=6.2 V, IOUT = 10 mA
Ta=-40
C to 85
C
±0.525
mV/
C
18. S-81245SG Y-X, S- 81245SGUP-DQ5-X, S-81245SG-Q5 - X ( 4.5-V output t ype)
Parameter Symbol Conditions Min. Typ. Max. Unit Test
cir.
Output voltage VOUT VIN =6.5 V, IOUT =10 mA 4.410 4.500 4.590 V 1
I/O voltage difference Vdif IOUT=10 mA
0.21 0.58 V 1
Line regulation 1
VOUT1VIN =5.5 to 16 V
IOUT=1 mA
52 104 mV 1
Line regulation 2
VOUT2VIN =5.5 to 16 V
IOUT=1
A
52 315 mV 1
Load regulation
VOUT3VIN =6.5 V
IOUT=1
A to 30 mA
50 90 mV 1
Current consumption ISS VIN =6.5 V, Unloaded
1.2 2.5
A2
Input voltage VIN
16 V
Temperature charac-
teristic of
VOUT
VOUT
Ta VIN=6.5 V, IOUT = 10 mA
Ta=-40
C to 85
C
±0.563
mV/
C
Table 18 (Unless otherwise specified: Ta=25
C)
Table 20 (Unless otherwise specified: Ta=25
C)
Table 19 (Unless otherwise specified: Ta=25
C)
HIGH-PRECISION VOLTAGE REGULAT OR
S-812XXSG Series
Seiko Instruments Inc. 9
19. S-81246SG Y-X, S- 81246SGUP-DQM-X, S- 81246SG - QM- X ( 4.6-V output type)
Parameter Symbol Conditions Min. Typ. Max. Unit Test
cir.
Output voltage VOUT VIN =6.6 V, IOUT =10 mA 4.508 4.600 4.692 V 1
I/O voltage difference Vdif IOUT=10 mA
0.20 0.57 V 1
Line regulation 1
VOUT1VIN =5.6 to 16 V
IOUT=1 mA
53 105 mV 1
Line regulation 2
VOUT2VIN =5.6 to 16 V
IOUT=1
A
53 322 mV 1
Load regulation
VOUT3VIN =6.6 V
IOUT=1
A to 30 mA
50 90 mV 1
Current consumption ISS VIN =6.6 V, Unloaded
1.2 2.5
A2
Input voltage VIN
16 V
Temperature charac-
teristic of
VOUT
VOUT
Ta VIN=6.6 V, IOUT = 10 mA
Ta=-40
C to 85
C
±0.575
mV/
C
20. S-81247SG - IE-X (4.7- V out put type)
Parameter Symbol Conditions Min. Typ. Max. Unit Test
cir.
Output voltage VOUT VIN =6.7 V, IOUT =10 mA 4.606 4.700 4.794 V 1
I/O voltage difference Vdif IOUT=10 mA
0.19 0.55 V 1
Line regulation 1
VOUT1VIN =5.7 to 16 V
IOUT=1 mA
54 107 mV 1
Line regulation 2
VOUT2VIN =5.7 to 16 V
IOUT=1
A
54 329 mV 1
Load regulation
VOUT3VIN =6.7 V
IOUT=1
A to 30 mA
50 90 mV 1
Current consumption ISS VIN =6.7 V, Unloaded
1.2 2.5
A2
Input voltage VIN
16 V
Temperature charac-
teristic of
VOUT
VOUT
Ta VIN=6.7 V, IOUT = 10 mA
Ta=-40
C to 85
C
±0.588
mV/
C
21. S-81250SG Y-X, S- 81250SGUP-DQD-X, S-81250SG-QD- X ( 5.0-V output type)
Parameter Symbol Conditions Min. Typ. Max. Unit Test
cir.
Output voltage VOUT VIN =7.0 V, IOUT =10 mA 4.900 5.000 5.100 V 1
I/O voltage difference Vdif IOUT=10 mA
0.16 0.50 V 1
Line regulation 1
VOUT1VIN =6.0 to 16 V
IOUT=1 mA
55 110 mV 1
Line regulation 2
VOUT2VIN =6.0 to 16 V
IOUT=1
A
55 350 mV 1
Load regulation
VOUT3VIN =7.0 V
IOUT=1
A to 40 mA
40 80 mV 1
Current consumption ISS VIN =7.0 V, Unloaded
1.2 2.5
A2
Input voltage VIN
16 V
Temperature charac-
teristic of
VOUT
VOUT
Ta VIN=7.0 V, IOUT = 10 mA
Ta=-40
C to 85
C
±0.625
mV/
C
Table 21 (Unless otherwise specified: Ta=25
C)
Table 22 (Unless otherwise specified: Ta=25
C)
Table 23 (Unless otherwise specified: Ta=25
C)
HIGH-PRECISION VOLTAGE REGULAT OR
S-812XXSG Series
10 Seiko Instruments Inc.
22. S-81252SG Y-X, S- 81252SGUP-DQL-X, S-81252SG-QL-X (5.2-V out put type)
Parameter Symbol Conditions Min. Typ. Max. Unit Test
cir.
Output voltage VOUT VIN =7.2 V, IOUT =10 mA 5.096 5.200 5.304 V 1
I/O voltage difference Vdif IOUT=10 mA
0.15 0.47 V 1
Line regulation 1
VOUT1VIN =6.2 to 16 V
IOUT=1 mA
57 113 mV 1
Line regulation 2
VOUT2VIN =6.2 to 16 V
IOUT=1
A
57 364 mV 1
Load regulation
VOUT3VIN =7.2 V
IOUT=1
A to 40 mA
40 80 mV 1
Current consumption ISS VIN =7.2 V, Unloaded
1.2 2.5
A2
Input voltage VIN
16 V
Temperature charac-
teristic of
VOUT
VOUT
Ta VIN=7.2 V, IOUT = 10 mA
Ta=-40
C to 85
C
±0.650
mV/
C
23. S-81253SG UP- DI J- X (5.3-V output type)
Parameter Symbol Conditions Min. Typ. Max. Unit Test
cir.
Output voltage VOUT VIN =7.3 V, IOUT =10 mA 5.194 5.300 5.406 V 1
I/O voltage difference Vdif IOUT=10 mA
0.14 0.45 V 1
Line regulation 1
VOUT1VIN =6.3 to 16 V
IOUT=1 mA
57 114 mV 1
Line regulation 2
VOUT2VIN =6.3 to 16 V
IOUT=1
A
57 371 mV 1
Load regulation
VOUT3VIN =7.3 V
IOUT=1
A to 40 mA
40 80 mV 1
Current consumption ISS VIN =7.3 V, Unloaded
1.2 2.5
A2
Input voltage VIN
16 V
Temperature charac-
teristic of
VOUT
VOUT
Ta VIN=7.3 V, IOUT = 10 mA
Ta=-40
C to 85
C
±0.663
mV/
C
24. S-81254SG UP- DIK-X (5.4-V output t ype)
Parameter Symbol Conditions Min. Typ. Max. Unit Test
cir.
Output voltage VOUT VIN =7.4 V, IOUT =10 mA 5.292 5.400 5.508 V 1
I/O voltage difference Vdif IOUT=10 mA
0.13 0.44 V 1
Line regulation 1
VOUT1VIN =6.4 to 16 V
IOUT=1 mA
58 115 mV 1
Line regulation 2
VOUT2VIN =6.4 to 16 V
IOUT=1
A
58 378 mV 1
Load regulation
VOUT3VIN =7.4 V
IOUT=1
A to 40 mA
40 80 mV 1
Current consumption ISS VIN =7.4 V, Unloaded
1.2 2.5
A2
Input voltage VIN
16 V
Temperature charac-
teristic of
VOUT
VOUT
Ta VIN=7.4 V, IOUT = 10 mA
Ta=-40
C to 85
C
±0.675
mV/
C
Table 24 (Unless otherwise specified: Ta=25
C)
Table 25 (Unless otherwise specified: Ta=25
C)
Table 26 (Unless otherwise specified: Ta=25
C)
HIGH-PRECISION VOLTAGE REGULAT OR
S-812XXSG Series
Seiko Instruments Inc. 11
25. S-81255SG UP- DI L- X (5.5-V output type)
Parameter Symbol Conditions Min. Typ. Max. Unit Test
cir.
Output voltage VOUT VIN =7.5 V, IOUT =10 mA 5.390 5.500 5.610 V 1
I/O voltage difference Vdif IOUT=10 mA
0.13 0.43 V 1
Line regulation 1
VOUT1VIN =6.5 to 16 V
IOUT=1 mA
58 116 mV 1
Line regulation 2
VOUT2VIN =6.5 to 16 V
IOUT=1
A
58 385 mV 1
Load regulation
VOUT3VIN =7.5 V
IOUT=1
A to 40 mA
40 80 mV 1
Current consumption ISS VIN =7.5 V, Unloaded
1.2 2.5
A2
Input voltage VIN
16 V
Temperature charac-
teristic of
VOUT
VOUT
Ta VIN=7.5 V, IOUT = 10 mA
Ta=-40
C to 85
C
±0.688
mV/
C
26. S-81256SG UP- DI M-X ( 5. 6 - V out put type)
Parameter Symbol Conditions Min. Typ. Max. Unit Test
cir.
Output voltage VOUT VIN =7.6 V, IOUT =10 mA 5.488 5.600 5.712 V 1
I/O voltage difference Vdif IOUT=10 mA
0.12 0.42 V 1
Line regulation 1
VOUT1VIN =6.6 to 16 V
IOUT=1 mA
59 117 mV 1
Line regulation 2
VOUT2VIN =6.6 to 16 V
IOUT=1
A
59 392 mV 1
Load regulation
VOUT3VIN =7.6 V
IOUT=1
A to 40 mA
40 80 mV 1
Current consumption ISS VIN =7.6 V, Unloaded
1.2 2.5
A2
Input voltage VIN
16 V
Temperature charac-
teristic of
VOUT
VOUT
Ta VIN=7.6 V, IOUT = 10 mA
Ta=-40
C to 85
C
±0.7
mV/
C
Test Circuits
Table 27 (Unless otherwise specified: Ta=25 C)
Table 28 (Unless otherwise specified: Ta=25 C)
Figure 3
GND
GND
VIN VOUT
VIN VOUT
1 2
S-812XXSG
Series
VV
A
V
AS-812XXSG
Series
HIGH-PRECISION VOLTAGE REGULAT OR
S-812XXSG Series
12 Seiko Instruments Inc.
Technic a l Term s
1 Output voltage (VOUT)
The precision of output volt age is guar anteed at ±2.0% or ±2.4% under the pr escribed conditions of input volt age,
output voltage, and t emperat ur e, which differ with it ems. I f these conditions are varied, out put voltage value may
change into beyond the scope of precision of output volt age. See electrical characteristics and characteristics
data for detail.
2 Line regulations 1 and 2 (
VOUT1,
VOUT2)
Indicates the input volt age dependencies of output voltage. That is, the values express how t he out put voltage
changes, when input voltage is changed under t he condition that output cur r ent is fixed.
3 Load regulation (
VOUT3)
Indicates the out put current dependencies of out put voltage. That is, the values express how the output volt age
changes, when output cur r ent is changed under the condition that input voltage is fixed.
4 I/O voltage defference (Vdif)
98% of VOUT is output when the voltage of VOUT+Vdif is applied. When Vdif is small, output keeps a constant
voltage in the small side of input voltage and large output curr ent can be obtained.
NOT E : Vdif is highly dependent on IOUT.
HIGH-PRECISION VOLTAGE REGULAT OR
S-812XXSG Series
Seiko Instruments Inc. 13
Operation
1 Basic operation
Figure 4 shows the block diagr am of t he S-812XXSG Series.
The error amplifier compares a ref er ence voltage VREF with a
part of t he out put voltage fed back by the feedback resistor s
RA and RB. It supplies the cont r ol t ransistor wit h t he gat e
current, necessar y to keep a st able out put voltage range not
influenced by input voltage or tem per at ur e fluctuation.
VIN
Error amplifier
RB
RA
Current
source
-
+
VOUT
GND
*
Reference
voltage
circuit
* Parasitic diode
Figure 4 Reference block diagram
2 Inter nal circuit
2.1 Reference voltage circuit
In a voltage regulator, t he r eference voltage cir cuit plays
a very important r ole because any change will show up
directly at an output.
The S-812XXSG Series has 0. 8 V t ypical stable voltage
circuit as a highly stable reference volt age sour ce.
Features:
Low power consumption
Good temperature char acteristic
2.2 Error amplifier
The error amplifier consumes very low current because it
is a differential amplif ier in a stable current circuit.
Features:
Good matching characterist ics
Wide oper at ing voltage range
Low offset volt age
2.3 Control transistor
The S-812XXSG Series has a Pch MO S transistor as a
current cont r ol transistor shown in Figur e 6. Therefore
an output curr ent IOUT is expressed by the following
formula where is only a small diff er ence between input
and output voltages:
IOUT=KP{2(VGS-VTP) (VIN-VOUT)-(VIN-VOUT)2 }
* KP : Conductive coefficiency
VTP : Threshold voltage of a control transistor
Setting KP to t he lar ge value results in a voltage
regulator with 160 mV typical I/O voltage difference.
VIN-
VIN+
GND
VIN
VOUT
Figure 5 Error amplifier
Bias
VIN
VOUT
GND
VGS
VREF -
+*
* Parasitic diode
Figure 6 Control transistor
NOTE: A parasitic diode is generated between VIN and VOUT.
If the electric potential of VIN is higher than that of
VOUT, IC may break because of a reverse current.
Keep VOUT less than VIN+0.3 V.
HIGH-PRECISION VOLTAGE REGULAT OR
S-812XXSG Series
14 Seiko Instruments Inc.
3 Temperature charact eristic of out put voltage
The temperature charact er ist ic of the output voltage is expressed by the following for mula in the range of
-40
C to 85
C.
*V
REF is 0.7 V min., 0.8 V t yp., 0.9 V max.
Transient Res pons e
1. Line transient r esponse
The overshoot and undershoot ar e caused in t he output voltage if the input voltage fluct uat es while t he output
current is const ant . Figure 7 shows the output voltage fluctuation due t o input volt age change between 6.0 V and
10 V in square wave. Table 19 shows the par ameter dependency when input voltage fluct uat es. For reference,
Figure 8 describes the measurement circuit .
Table 29 Parameter dependency due to input voltage fluctuation
Parameter Method to decrease
overshoot Method to decrease
undershoot
Output current IOUT Decrease Decrease
Load capacitance CLIncrease Increase
Input voltage fluctuation
VIN*Decrease Decrease
Temperature Ta
High temperature
*
VIN: High voltage value - low voltage value
For refer ence, t he next page descr ibes t he r esults of m easur ing the ringing amount s at the VOUT pin using the
output curr ent (IOUT), load capacit ance ( CL), input voltage f luct uat ion widt h (
VIN), and temper at ur e as paramet er s.
VREF
VOUT x (±0.1) mV/
C typ.
Figure 7 Output voltage fluctuation due to input voltage fluctuation
Input voltage 6.0
10 V
Undershoot
Overshoot
Output voltage
Figure 8 Measuring circuit
Fast amplifier
P.G.
S-812XXSG Oscilloscope
CL
VOUT
VSS
VIN
+
-
HIGH-PRECISION VOLTAGE REGULAT OR
S-812XXSG Series
Seiko Instruments Inc. 15
-
2. Load transient r esponse
The overshoot and undershoot ar e caused in t he output voltage if the output curr ent fluctuates while the input
voltage is costant. Figur e 9 shows the output voltage fluctuation due to out put cur r ent change between 10m A and
1
A in square wave. Table 20 shows the par ameter dependency when output curr ent fluctuates. For r ef er ence,
Figure 10 describes the measuring circuit .
Line transient response of S- 81250SG
Reference data
1. IOUT dependency
CL=10
F
Ta=25
C
1.2
1.0
0.8
0.6
0.4
0.2
0.00 5 10 15 20 25 30
Ringing
amount
(V)
IOUT (mA)
2. CL dependency
Undershoot
Overshoot
IOUT=10mA
Ta=25
C
1.2
1.0
0.8
0.6
0.4
0.2
0.00
Ringing
amount
(V)
10 20 30 40 50
CL (
F)
4. Temperature dependency
Undershoot
Overshoot
IOUT=10mA
CL=10
F
1.2
1.0
0.8
0.6
0.4
0.2
0.0
Ringing
amount
(V)
80400-40 Ta (
C)
3.
VIN dependency
VIN shows the difference between the low
voltage fixed to 6 V and the high voltage.
For example,
VIN = 2 V means the difference
between 6 V and 8 V.
1.2
1.0
0.8
0.6
0.4
0.2
0.00
Ringing
amount
(V)
12 45
V
IN (V)
3
CL=10
F
Ta=25
C
IOUT=10mA
Figure 9 Output voltage fluctuation due to output current fluctuation
Output current 10mA
1
A
Output voltage Overshoot
Undershoot
Figure 10 Measuring circuit
S-812XXSG Oscilloscope
CL
VOUT
VSS
VIN
+
-
HIGH-PRECISION VOLTAGE REGULAT OR
S-812XXSG Series
16 Seiko Instruments Inc.
Table 28 Parameter dependency due to output current fluctuation
Parameter Method to decrease
overshoot Method to decrease
undershoot
Output current fluctuation
IOUT Decrease Decrease
Load capacitance CLIncrease Increase
Input voltage VIN Increase Increase
Temperature Ta
For refer ence, t he following describes the result s of measur ing t he r inging amounts at t he VOUT pin using the input
voltage (VIN), load capacitance ( CL), output current fluctuation width (
IOUT), and temper at ur e as par ameter s.
Load transient r esponse of S- 81250SG
Reference data
2. CL dependency
VIN=7V
Ta=25
C
0.5
0.4
0.3
0.2
0.1
0.0 010 20 30 40 50
CL (
F)
Ringing
amount
(V)
3.
IOUT dependency
IOUT shows the difference between the low
current fixed to 1
A and the high.
For example,
IOUT =10 mA means the difference
between 10mA and 1
A.
CL=10
F
Ta=25
C
VIN=7V
1.2
1.0
0.8
0.6
0.4
0.2
0.0 0 5 10 15 20 25 30
IOUT (mA)
Ringing
amount
(V)
4. Temperature dependency
Undershoot
Overshoot
VIN=7V
CL=10
F
0.5
0.4
0.3
0.2
0.1 04080-40
Ta (
C)
Ringing
amount
(V)
1. VIN dependency
0.6
0.5
0.4
0.3
0.2
0.1
0.06 8 10 12 14 16
Ringing
amount
(V)
VIN (V)
CL=10
F
Ta=25
C
HIGH-PRECISION VOLTAGE REGULAT OR
S-812XXSG Series
Seiko Instruments Inc. 17
Standard Circuit
The basic circuit using t he S- 812XXSG Series is shown in Figure 11.
Application Circuits
1. High output cur r ent positive voltage regulator
Single-point GND
CommonCommon
CO
CI
VOUT
VIN 32
1
S-812XXSG
Series
Figure 11
Figure 12 shows a circuit f or incr easing the output
current.
Short-cir cuit pr otection of Tr1 is possible by
adding the sense resistor RS and the PNP
transistor as shown in Figur e 13.
R
Tr1
GND
VOUT
VIN
VIN VOUT
Common
Figure 12
S-812XXSG
Series
GND
Rs
R
VIN
Tr2
Tr1
VIN
VOUT
Common
S-812XXSG
Series
Figure 13
HIGH-PRECISION VOLTAGE REGULAT OR
S-812XXSG Series
18 Seiko Instruments Inc.
2. Circuits f or i ncreasi ng out put voltage
3. Constant curr ent r egul at or
4. Dual supply
If the out put voltage you need cannot be found in our
product line-up, the designs in Figures 14 or 15 will
increase output volt ages easily.
VOUT=Vxx 11
2
1
2
2
1
R
RIss R Vxx R
R
Because of its low curr ent consumption, t he
S-812XXSG Series can set t he resistor values, and R1
and R2 high to lower the power consumption of whole
systems.
Current f lows t o t he Zener diode (Di) thr ough t he
quiescent current ( ISS) of the S-812XXSG Series, and
the GND terminal r ises f or the voltage of DI .
When Di cannot drive with a quiescent cur r ent, the
added resistance R increases t he cur rent flowing
through DI.
GND
VOUT
ISS R2
R1
VOUT
VIN
VIN
VXX
S-812XXSG
Series
Fi
g
ure 14
Di
GND R
ISS
VOUT VOUT
VIN
VIN S-812XXSG
Series
Fi
g
ure 15
The S-812XXSG Series can be used as a constant -
current r egulat or within allowable dissipation limits.
IOUT = VXX
RA+ ISS IOUT
RL
GND
VXX
GND ISS
RA
VOUT
VIN
VIN S-812XXSG
Series
Figure 16 Constant current regulator
A dual supply can be formed using the S- 812XXSG
Series.
Figure 17 shows a circuit exam ple for receiving two
outputs (5 V and 8 V) with the S- 81230SG and the S-
81250SG. As the r esistance R lets the quiescent
current of I C1 pass, R is unnecessary if the minim um
output curr ent of IC2 is more than the IC1 quiescent
current.
VOUT2
GND GND
GND
IC2
IC
VOUT
VOUT
+5 V
+8 V
VOUT1
VIN
VIN
R
VIN S-81230
SG
S-81250
SG
Figure 17 Dual power source
HIGH-PRECISION VOLTAGE REGULAT OR
S-812XXSG Series
Seiko Instruments Inc. 19
Notes on Design
Voltage regulator s may oscillate if sm all or zero capacity is connected to IC input when t he impedance of t he
power source is high and a large capacit y is connected to IC output.
The S-812XXSG Series has no shor t -current circuit limiting. The element may break by exceed current of
errorneous short-current.
Keep the output cur r ent mor e than 10
A when using the product of VOUT
2.6 V under the condit ion of high input
voltage and high temperature.
Do not apply any ripple voltage under the condit ion in Figur e 18 t o VIN terminal.
Mount diodes for IC protection, when connecting another power supply to VOUT terminal.
When designing f or mass pr oduct ion using an applicat ion cir cuit described here, k eep the deviation of com ponents
and temperature charact er ist ic.
Figure 18
f
VPP
V [V]
f [Hz]
VPP
0.5 V
f
1000 Hz
VOUT OUT
GND
VIN V / R
Figure 19
HIGH-PRECISION VOLTAGE REGULAT OR
S-812XXSG Series
20 Seiko Instruments Inc.
Dimensions
Markings
0.45
0.1
12.7 min.
are availableand
1.5 max.
4.2 max.
0.8 max.
0.45
0.1
0.6 max.
5.2 max.
Mark side
(1) TO-92
5.0±0.2
2.3 max.
1.27
0.05 1.27
0.05
(2) SOT-89-3
2.5
45
(0.4) (0.2)
(0.4)
0.8 min.
2.5
0.2 4.0
1.5
0.2
0.4
0.05
0.45
0.1
1.5
0.1
4.5
0.2
1.6
0.2
0.4
0.1
+0.25
-0.35
0.4
0.1
1.5
0.1
Figure 20
Unit: mm
0.95
0.1
2.8
0.4
0.1
0 min.
1.1
0.1 1.3 max.
1.6
2.9 (3.1 max.)
+0.2
-0.3
0.95
0.1
1.9
0.2
0.16+0.1
-0.06
0.45
(
3
)
SOT-23-5
3
2
18 2
S
1
0
16 1
Product name
Last digit of the year
Lot No.
Figure 21
Product name
(abbreviation)
Lot NO.
1 2
(1) TO-92 (2) SOT- 89-3 (3) SOT- 23-5
(1) White label (2) Blue label
3S G
1
Product name
(abbreviation)
Lot NO.
Factor
y
code
1 2
to
Product name
(abbreviation)
to
Lot NO.
: Alphabet
: Dot on one side
HIGH-PRECISION VOLTAGE REGULAT OR
S-812XXSG Series
Seiko Instruments Inc. 21
Package Power Dissipation
600
400
200
50 100 1500 Ta (
C)
0
(1) TO-92
Power
Dissipation
PD
(mW)
Before mounted
600
400
200
50 100 1500 Ta (
C)
0
(2) SOT-89-3
Power
Dissipation
PD
(mW)
Before mounted
Figure 22
400
300
200
100
25 75
50 100 1500 Ta (
C)
0125
(3) SOT-23-5
Power
Dissipation
PD
(mW)
Before mounted
HIGH-PRECISION VOLTAGE REGULAT OR
S-812XXSG Series
22 Seiko Instruments Inc.
Taping Di m e ns ions
1. SOT-89-3
1.1 Tape speci fications
T1 and T2 types are available depending upon the direction of I Cs on the tape.
(
1
)
Wh it e label
(
without a hole in the cent er of embossed ar ea
)
(2) Blue label (wit h a hole in the center of embossed area)
2.0
0.05
1.5 4.0
0.1
(
10 pitches : 40.0
0.2
)
4.75
0.1
8.0
0.1
+0.1
-0
0.3
0.05
2.0
0.1
5
max.
1.5+0.1
-0
Unit: mm
Figure 24
T2T1
Feed direction Feed direction
3
max.
3
max.
2.0
0.05
1.5 4.0
0.1
(
10 pitches : 40.0
0.2
)
4.75
0.1
8.0
0.1
+0.1
-0
0.3
0.05
2.0
0.1
5
max.
Figure 23
HIGH-PRECISION VOLTAGE REGULAT OR
S-812XXSG Series
Seiko Instruments Inc. 23
1.2 Reel specif i cat ions
1 reel holds 1000 regulator s.
1.3 M agazi ne Dimensions
1 stick holds 25 r egulat or s.
Figure 25
Counting mark (every five units)
Part A
5
0.1
38.4353535
34.8
178.2
0.1
Part B
Figure 26
2.5
2.8
3.35
0.07 3.5
0.07 3.5
0.07
1.9 1.6
2.8 3.15 3.85
0.07 2.8
0.5 2.8
3.35
0.073.5
0.073.5
0.07
1.45
0.1
0.5
0.5
0.5
1.45
0.1
4.1
0.07
2.6
0.1
10.0
0.1
3.25
0.1
2.7
0.07
“Part A” ma
g
nified “Part B” ma
g
nified
Unit : mm
180 0
-3
16.5 Max.
60 +1
0
(dimension of external reel core)
(
1.5
)
13.0
0.3
(dimension of inner reel core)
15.4
1.0
10.5
0.4
13
0.2
(60
)
(60
)
2
0.2
Unit: mm
HIGH-PRECISION VOLTAGE REGULAT OR
S-812XXSG Series
24 Seiko Instruments Inc.
2. SOT-23-5
2.1 Tape speci fications
T1 and T2 types are available depending upon the direction of I Cs on the tape.
The top cover tape comes in 2 tones ; opaque, semi-transparent and t ransparent.
2.2 Reel specif ications
1 reel holds 3000 regulator s.
Figure 28
3
max.
3.2
0.1
0.27
0.05
1.4
0.1
3
max. 4.0
0.1
1.0
1.5+0.1
-0 +0.2
-0 2.0
0.05 4.0
0.1
(
10 pitches : 40.0
0.2
)
1.75
0.1
3.5
0.05
8.0
0.2
T2T1 Unit : mm
Feed direction
Feed direction
Figure 27
180 0
3
12.5 Max.
60 +1
0
(dimension of external reel core)
(
1.5
)
9.0
0.3
(dimension of inner reel core)
11.4
1.0
10.5
0.4
13
0.2
(60
)
(60
)
2
0.2
Unit: mm
HIGH-PRECISION VOLTAGE REGULAT OR
S-812XXSG Series
Seiko Instruments Inc. 25
Characteristics
1 Input voltage - out put voltage
1.4 S
-
81225SG series
1.1 S-81211SG series
1.8
1.2
0.70.8
Ta=25
C
VOUT
(V)
IOUT=3 mA
IOUT=1 mA
IOUT=0.5 mA
VIN (V)
1.1
1.0
0.9
0.8
1.61.41.21.0
1.2 S-81215SG series
VIN (V)
VOUT
(V)
2.0
2.0
1.01.0
Ta=25
C
IOUT=0.5 mA
IOUT=3 mA
IOUT=1 mA
1.2
1.4
1.6
1.8
1.81.61.41.2
1.3 S-81220SG series
3.0
2.2
1.21.5
Ta=25
C
VOUT
(V)
IOUT=3 mA
IOUT=1 mA
IOUT=0.5 mA
VIN (V)
2.0
1.4
1.6
1.8
1.8 2.1 2.4 2.7
VOUT
(V)
3.5
2.7
1.72.0
Ta=25
C
IOUT=3 mA
IOUT=1 mA
IOUT=0.5 mA
VIN (V)
2.5
1.9
2.1
2.3
3.22.3 2.6 2.9
1.6 S-81235SG series
VOUT
(V)
4.5
4.0
3.0 3.0
Ta=25
C
IOUT=1 mA
IOUT=20 mA
IOUT=10 mA
VIN (V)
3.8
3.6
3.2
3.4
4.23.3 3.6 3.9
1.5 S-81230SG series
4.0
3.2
2.22.5
Ta=25
C
VOUT
(V)
IOUT=1 mA
IOUT=20 mA
IOUT=10 mA
VIN (V)
3.0
2.8
2.4
2.6
3.72.8 3.1 3.4
1.7 S-81240SG series
5.0
4.2
3.23.5 VIN (V)
Ta=25
C
VOUT
(V)
IOUT=1 mA
IOUT=20 mA
IOUT=10 mA
4.0
3.8
3.4
3.6
4.73.8 4.1 4.4
1.8 S-81245SG series
VOUT
(V)
5.5
5.0
4.04.0
Ta=25
C
IOUT=1 mA
IOUT=20 mA
IOUT=10 mA
VIN (V)
4.8
4.6
4.2
4.4
5.24.3 4.6 4.9
HIGH-PRECISION VOLTAGE REGULAT OR
S-812XXSG Series
26 Seiko Instruments Inc.
2. Output cur r ent - output voltage
1.9 S-81250SG series
6.0
5.2
4.24.5
Ta=25
C
VOUT
(V)
IOUT=1 mA
IOUT=20 mA
IOUT=10 mA
VIN (V) 5.74.8 5.1 5.4
5.0
4.8
4.4
4.6
2.1 S-81211SG series
10
1.2
0.7 0IOUT (mA)
VIN=1.5V
VOUT
(V)
-40
C
85
C25
C
8246
1.1
1.0
0.8
0.9
2.2 S-81215SG series
100
1.5 VIN=3.5V
VOUT
(V)
0.50
-40
C
85
C
25
C
IOUT (mA) 8020 40 60
1.3
1.1
0.7
0.9
2.3 S-81220SG series
100
2.0 VIN=4.0V
VOUT
(V)
1.0 0
85
C
25
C
-40
C
IOUT (mA) 8020 40 60
1.8
1.6
1.2
1.4
2.4 S-81225SG series
100
2.5 VIN=4.5V
VOUT
(V)
1.50IOUT (mA) 8020 40 60
2.3
2.1
1.7
1.9 85
C25
C
-40
C
2.5 S-81230SG series
100
3.0 VIN=5.0V
VOUT
(V)
2.00
-40
C
25
C
85
C
IOUT (mA)
8020 40 60
2.8
2.6
2.2
2.4
2.6 S-81235SG series
100
3.5 VIN=5.5V
VOUT
(V)
2.50
-40
C
25
C
85
C
IOUT (mA) 8020 40 60
3.3
3.1
2.7
2.9
HIGH-PRECISION VOLTAGE REGULAT OR
S-812XXSG Series
Seiko Instruments Inc. 27
3. Output cur r ent - output voltage (at low load)
IOUT (mA)
2.7 S-81240SG series
100
4.0
3.00
VIN=6.0V
VOUT
(V) -40
C
25
C
85
C
8020 40 60
3.8
3.6
3.2
3.4
2.8 S-81245SG series
100
4.5
VIN=6.5V
VOUT
(V)
3.50
-40
C
85
C
25
C
IOUT (mA) 8020 40 60
4.3
4.1
3.7
3.9
IOUT (mA)
2.9 S-81250SG series
100
5.0
VIN=7.0V
VOUT
(V)
4.00
-40
C
25
C
85
C
8020 40 60
4.8
4.6
4.2
4.4
3.1 VOUT
1.4V
100
2.0
1.0
Ta=85
C
VOUT
(V)
VIN=10V
VIN=8V
VIN=6V
VIN=4V
1010.10.010.001
1.8
1.6
1.4
1.2
IOUT (mA)
3.2 1.5V
VOUT
2.6V
VOUT
(V)
1.7
1.5
Ta=85
C
VIN=10V
VIN=8V
VIN=4V
VIN=6V
1001010.10.010.001
1.6
1.4
IOUT (mA)
3.3 VOUT
2.7V
3.1
2.9
VOUT
(V) Ta=85
C
VIN=16V
VIN=10V
VIN=7V
V
IN
=12V
1001010.10.010.001
3.0
IOUT (mA)
HIGH-PRECISION VOLTAGE REGULAT OR
S-812XXSG Series
28 Seiko Instruments Inc.
4. Input voltage - curre nt consum pt ion
5. Temperature characteristic of out put voltages
6. I/O voltage difference characteristics
S-81250SG series
2.0
00VIN (V)
ISS
(
A)
85
C
25
C
-40
C
1.0
4 6 8 1012141618202
5.2 VOUT
1.4 V
-0.5
-1.0
0
0.5
-40 0204060
Ta (
C)
-20 80
* (%)
5.1 VOUT
1.3 V
-0.5
-1.0
0
0.5
1.0
-40 0204060
Ta (
C)
-20 80
* (%)
*Definite with fluctuation ratio based on the output voltage at Ta=25
C
6.1 S-81211SG series
(Vinitial:Output voltage value at
VIN=1.5 V and IOUT=0.5 mA)
1.02
VOUT
Vinitial
0.92
0.90
0.94
0.96
0.98
1.00
0.0 0.2 0.4 0.6 0.8 1.0
VIN-Vinitial (V)
Ta=25
C
IOUT=5 mA
IOUT=3 mA
IOUT=2 mA
IOUT=1 mA
IOUT=0.5 mA
6.2 S-81215PG series
(Vinitial:Output voltage value at
VIN=3.5 V and IOUT=0.5 mA)
1.02
VOUT
Vinitial
0.92
0.90
0.94
0.96
0.98
1.00
0.0 0.2 0.4 0.6 0.8 1.0
VIN-Vinitial (V)
Ta=25
C
IOUT=1 mA
IOUT=5 mA
IOUT=10 mA
HIGH-PRECISION VOLTAGE REGULAT OR
S-812XXSG Series
Seiko Instruments Inc. 29
6.5 S-81230SG series
(Vinitial:Output voltage value at
VIN=5.0 V and IOUT=10 mA)
6.3 S-81220SG series
(Vinitial:Output voltage value at
VIN=4.0 V and IOUT=10 mA)
1.02
VOUT
Vinitial
0.92
0.90
0.94
0.96
0.98
1.00
0.0 0.2 0.4 0.6 0.8 1.0
VIN-Vinitial (V)
Ta=25
C
IOUT=1 mA
IOUT=5 mA
IOUT=20 mA
IOUT=10 mA
1.02
VOUT
Vinitial
0.92
0.90
0.94
0.96
0.98
1.00
0.0 0.2 0.4 0.6 0.8 1.0
VIN-Vinitial (V)
Ta=25
C
IOUT=1 mA
IOUT=5 mA
IOUT=10 mA IOUT=
20 mA
IOUT=
30 mA
1.02
6.4 S-81225SG series
(Vinitial:Output voltage value at
VIN=4.5 V and IOUT=10 mA)
VOUT
Vinitial
0.92
0.90
0.94
0.96
0.98
1.00
0.0 0.2 0.4 0.6 0.8 1.0
VIN-Vinitial (V)
Ta=25
C
IOUT=1 mA
IOUT=5 mA
IOUT=10 mA IOUT=
20 mA
IOUT=
30 mA
6.6 S-81235SG series
(Vinitial:Output voltage value at
VIN=5.5 V and IOUT=10 mA)
1.02
VOUT
Vinitial
0.92
0.90
0.94
0.96
0.98
1.00
0.0 0.2 0.4 0.6 0.8 1.0
VIN-Vinitial (V)
Ta=25
C
IOUT=1 mA
IOUT=
5 mA
IOUT=
10 mA IOUT=
20 mA
IOUT=
30 mA
0.6
VIN-Vinitial (V)
1.02
VOUT
Vinitial
0.92
0.90
0.94
0.96
0.98
1.00
0.0 0.2 0.4 0.8 1.0
Ta=25
C
IOUT=1 mA
IOUT=
5 mA
IOUT=
10 mA IOUT=
20 mA
IOUT=30 mA
6.7 S-81240SG series
(Vinitial:Output voltage value at
VIN=6.0 V and IOUT=10 mA)
1.02
VOUT
Vinitial
0.92
0.90
0.94
0.96
0.98
1.00
0.0 0.2 0.4 0.6 0.8 1.0
VIN-Vinitial (V)
Ta=25
C
IOUT=1 mA IOUT=5 mA
IOUT=
10 mA IOUT=
20 mA IOUT=30 mA
6.8 S-81245SG series
(Vinitial:Output voltage value at
V
IN
=6.5 V and I
OUT
=10 mA
)
6.9 S-81250PG series
(Vinitial:Output voltage value at
VIN=7.0 V and IOUT=10 mA)
1.02
VOUT
Vinitial
0.92
0.90
0.94
0.96
0.98
1.00
0.0 0.2 0.4 0.6 0.8 1.0
VIN-Vinitial (V)
Ta=25
C
IOUT=1 mA IOUT=5 mA
IOUT=
10 mA
IOUT=20 mA
IOUT=30 mA
HIGH-PRECISION VOLTAGE REGULAT OR
S-812XXSG Series
30 Seiko Instruments Inc.
7. Temperature characteristic of I/O voltage difference
7.2 S-81215SG series
Ta (
C)
100
0
200
300
400
500
-50 -30 -10 10 30 50 70 90
IOUT=0.5 mA
IOUT=1 mA
IOUT=3 mA
Vdif
(mV)
IOUT=5 mA
7.1 S-81211SG series
Vdif
(mV)
Ta (
C)
100
0
200
300
400
500
-50 -30 -10 10 30 50 70 90
IOUT=5 mA
IOUT=3 mA
IOUT=2 mA
IOUT=1 mA
IOUT=0.5 mA
7.5 S-81230SG series
1.5
1.0
0.5
0
Vdif
(V)
Ta (
C)
-50 -30 -10 10 30 50 70 90
IOUT=30 mA
IOUT=20 mA
IOUT=10 mA
IOUT=5 mA
7.6 S-81235SG series
1.5
1.0
0.5
0
Ta (
C)
Vdif
(V)
-50 -30 -10 10 30 50 70 90
IOUT=30 mA
IOUT=20 mA
IOUT=10 mA
IOUT=5 mA
7.4 S-81225SG series
1.5
1.0
0.5
0
-50 -30 -10 10 30 50 70 90
Vdif
(V)
Ta (
C)
IOUT=30 mA
IOUT=20 mA
IOUT=10 mA
IOUT=5 mA
IOUT=1 mA
7.3 S-81220SG series
1.5
1.0
0.5
0-50 -30 -10 10 30 50 70 90
IOUT=1 mA
IOUT=5 mA
IOUT=10 mA
IOUT=20 mA
IOUT=30 mA
Vdif
(V)
Ta (
C)
HIGH-PRECISION VOLTAGE REGULAT OR
S-812XXSG Series
Seiko Instruments Inc. 31
Measuring Circuits
7.8 S-81245SG series7.7 S-81240SG series
1.5
1.0
0.5
0
Ta
(
C
)
Vdif
(V)
-50 -30 -10 10 30 50 70 90
IOUT=30 mA
IOUT=20 mA
IOUT=10 mA
IOUT=5 mA
7.9 S-81250SG series
1.5
1.0
0.5
0
Ta
(
C
)
Vdif
(V)
-50 -30 -10 10 30 50 70 90
IOUT=30 mA
IOUT=20 mA
IOUT=10 mA
IOUT=5 mA
1.5
1.0
0.5
0
Ta
(
C
)
Vdif
(V)
-50 -30 -10 10 30 50 70 90
IOUT=30 mA
IOUT=20 mA
IOUT=10 mA
IOUT=5 mA
Figure 29
3. Current consumption
GND
VOUT
VIN
A
RL
GND
VOUT
VIN
V
A
2. Output cur r ent - output voltage
1. Input volt age - output voltage
IOUT
GND
VOUT
VIN
V V
A
32
Collection of Product FAQs
Author: Imura Yukihiro Date: 99/05/31 (Monday) 11:50 (Modified:)
<Information level>
A: Public (Printing O.K.)
Index: A: General
<Product>
Division name: 01 IC
Category 1: 11 Power Supply
Category 2: 2. Voltage Regulators
Cal No.: Overall
Related Documents:
Question:
Why do people dislike using electrolytic capacitors?
Answer:
Because elec trolytic capac it or s may c ause fail ur e due to short- c irc uit or even burn when subjec ted to an
overcurrent or ov ervoltage, an increasing number of users are declining to use electrolytic capacitors,
as UL and other safety standards require that such products be incombustible. As a result, ceramic
capacitors of no short-circuit and made of nonflammable materials attract most users.
<Remarks>
FAQ No.: 11S814005
