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AS1360
1.5µA Low-Power, Positive Voltage Regulato r
www.austriamicrosystems.com/LDOs/AS1360 Revision 1.07 1 - 13
Datasheet
1 General Description
The AS1360 low-power, positive voltage regulator was designed to
deliver up to 250mA while consuming only 1.5µA of quiescent cur-
rent. The device is available in fixed output voltages of 1.8, 2.1, 2.5,
3.0, 3.3, 4.0, 4.5 and 5.0V.
The device features integrated short-circuit and overcurrent protec-
tion.
The wide input voltage range, low-dropout voltage, and high-accu-
racy output voltage makes the device perfectly suited for 2- and 3-
cell battery-powered and portable applications.
The low dropout voltage (650mV) prolongs battery life and allows
high current in small applications when operated with minimum
input-to-output voltage differentials.
The device features very stable output voltage (using only 1µF tanta-
lum or aluminum-electrolytic capacitors), strict output voltage regula-
tion tolerances (±0.5%), and excellent line-regulation.
The AS1360 is available in a 3-pin SOT23 package.
Figure 1. AS1360 - Block Diagram
2 Key Features
Low Quiescent Current: 1.5µA
Input Voltage Range: Up to 20V
Low Dropout Voltage
- 250mV @ 100mA
- 400mV @ 200mA
Fixed Output Voltages: 1.8, 2.1, 2.5, 3.0, 3.3, 4.0, 4.5, 5.0V
High Output Current: 250mA (VOUT = 5.0V)
High-Accuracy Output Voltage: ±1.5%
Exceptional Line Regulation: 0.1%/V
Low Temperature Drift: ±100ppm/ºC
Integrated Short-Circuit and Overcurrent Protection
3-pin SOT23 Package
3 Applications
The device is ideal for mobile phones, PDAs, digital cameras, smart
battery packs, battery-powered alarms, solar-powered instruments,
intelligent instruments, CO2 and smoke detectors, CPU power sup-
plies, and any battery-powered application.
+
–
Short-Circuit
Protection
GND 1
3
VIN
2
VOUT
Voltage
Reference
AS1360
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AS1360
Datasheet - P i n o u t a n d Packa g i n g
4 Pinout and Packaging
Pin Assignments
Figure 2. Pin Assignments (Top View)
Pin Descriptions
Table 1. Pin Descriptions
Pin Number Pin Name Description
1 GND
Ground. This pin should be connected to the negative side of the output and the negative
terminal of the input capacitor. No high-current flows out of this pin, only bias current (1.5µA,
typ).
Note: Voltage drops between this pin and the negative side of the load should be mini-
mized.
2 VOUT
Regulated Output Voltage. This pin should be connected to the positive side of the load and
the positive terminal of the output capacitor. Current flowing out of this pin is equivalent DC
load current.
Note: The positive side of the output capacitor should be mounted as close as is practical
to this pin.
3 VIN
Unregulated Input Voltage. This pin should be connected to the positive terminal of the input
capacitor.
Note: The input capacitor should be mounted as close as is practical to this pin.
3
1
3-pin SOT23
VIN
GND
VOUT 2
AS1360
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AS1360
Datasheet - A b s o l u t e Maximum R a t i n gs
5 Absolute Maximum Ratings
Stresses beyond those listed in Table 2 may cause permanent damage to the device. These are stress ratings only, and functional operation of
the device at these or any other conditions beyond those indicated in Section 6 Electrical Characteristics on page 4 is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
Table 2. Absolute Maximum Ratings
Parameter Min Max Units Comments
Electrical Parameters
Input Voltage +30 V
Continuous Output Current PD/
(VIN - VOUT)mA
Peak Output Current 500 mA
Output Voltage - 0.3V VIN + 0.3V
or +7V V Minimum of the two values
Electrostatic Discharge
Electrostatic Discharge HBM +/- 1 kV Norm: MIL 883 E method 3015
Thermal Information
Thermal Resistance ΘJA 230 ºC/W Typical FR4, 4-layer application
Temperature Ranges and Storage Conditions
Storage Temperature Range -40 +125 ºC
Package Body Temperature +260 ºC
The reflow peak soldering temperature (body
temperature) specified is in compliance with IPC/
JEDEC J-STD-020 “Moisture/ Reflow Sensitivity
Classification for Non-Hermetic Solid State
Surface Mount Devices”.
Humidity non-condensing 5 85 %
Moisture Sensitive Level 1 Represents a max. floor life time of unlimited
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AS1360
Datasheet - E l e c t r i cal Ch a racte r i s t i c s
6 Electrical Characteristics
Typical values are at TAMB = +25°C, VDD = 3.3V (unless otherwise specified). All limits are guaranteed. The parameters with min and max val-
ues are guaranteed with production tests or SQC (Statistical Quality Control) methods.
Table 3. Electrical Characteristics
Symbol Parameter Condition Min Typ Max Unit
TAMB Operating Temperature
Range -40 +85 °C
VIN Input Voltage 20 V
VOUT Output Voltage IOUT = 40mA
1
,
IOUT = 15mA if VOUT = 1.8V
1. VOUTNOM is the nominal device output voltage.
VOUTNOM
- 1.5%
VOUTNOM
± 0.5%
VOUTNOM
+ 1.5% V
IOUT(MAX) Maximum Output Current
VOUT = 5.0V
(VIN = VOUTNOM + 1.0V) 250
mA
VOUT = 4.0V 200
VOUT = 3.3V 150
VOUT = 3.0V 150
VOUT = 2.5V 125
VOUT = 2.1V 115
VOUT = 1.8V 110
∆VOUT/VOUT Load Regulation
2
2. Measured at a constant junction temperature using low duty cycle pulse testing.
VOUT = 5.0V, 1mA ≤ IOUT ≤ 100mA -1.60 ±0.8 +1.60
%
VOUT = 4.0V, 1mA ≤ IOUT ≤ 100mA -2.25 ±1.1 +2.25
VOUT = 3.3V, 1mA ≤ IOUT ≤ 80mA -2.72 ±1.3 +2.72
VOUT = 3.0V, 1mA ≤ IOUT ≤ 80mA -3.00 ±1.5 +3.00
VOUT = 2.5V, 1mA ≤ IOUT ≤ 60mA -3.60 ±1.8 +3.60
VOUT = 2.1V, 1mA ≤ IOUT ≤ 40mA -2.60 ±1.6 +2.60
VOUT = 1.8V, 1mA ≤ IOUT ≤ 30mA -1.60 ±0.8 +1.60
∆VOUT x 100/
∆VIN x VOUT Line Regulation IOUT = 40mA,
(VOUTNOM +1.0) ≤ VIN ≤ 10.0V 0.1 0.25 %/V
VIN - VOUT Dropout Voltage
IOUT = 200mA, VOUTNOM = 5.0V 400 630
mV
IOUT = 200mA, VOUTNOM = 4.0V 400 700
IOUT = 160mA, VOUTNOM = 3.3V 400 700
IOUT = 160mA, VOUTNOM = 3.0V 400 700
IOUT = 120mA, VOUTNOM = 2.5V 400 700
IOUT = 60mA, VOUTNOM = 2.1V 200 500
IOUT = 20mA, VOUTNOM = 1.8V 180 300
IQInput Quiescent Current VIN = VOUTNOM +1.0V 1.5 3.0 µA
TCVOUT Temperature Coefficient of
VOUT
3
3. TCVOUT = (VOH - VOL) x 10
6
/(VOUTNOM x Temperature).
Where:
VOH is the highest voltage measured over the device temperature range.
VOL is the lowest voltage over the device temperature range.
IOUT = 40mA,
-40ºC ≤ TAMB ≤ +85ºC ±100 ppm/ºC
tROutput Rise Time
10% VOUTNOM to 90% VOUTNOM, VIN =
0V to VOUTNOM + 1V,
RLOAD = 25Ω resistive
150 µs
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AS1360
Datasheet - Typica l O p e r a ting Ch a r a c t e r isti cs
7 Typical Operating Characteristics
VOUT = 3.3V, ILOAD = 100µA, VIN = 4.3V, CIN 1µF (tantalum), COUT = 1µF (tantalum), TAMB = +25ºC (unless otherwise specified).
Figure 3. Supply Current vs. Input Voltage Figure 4. Supply Current vs. Load Current
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8
1.9
4 5 6 7 8 9 10
Input Voltage (V)
Supply Current (µA) .
85°C
25°C
0°C
-40°C
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8
1.9
0 25 50 75 100 125 150 175 200
Load Current (mA)
Supply Current (µA) .
85°C
25°C
0°C
-40°C
Figure 5. Supply Current vs. Temperature Figure 6. Output Voltage vs. Input Voltage
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8
1.9
-40 -20 0 20 40 60 80 100 120 140
Temperature (°C)
Supply Current (µA) .
3.296
3.298
3.3
3.302
3.304
3.306
3.308
3.31
3.312
4 5 6 7 8 9 10
Input Voltage (V)
Output Voltage (V) .
85°C
25°C
0°C
-40°C
Figure 7. Output Voltage vs. Load Current Figure 8. Dropout Voltage vs. Load Current
3.23
3.24
3.25
3.26
3.27
3.28
3.29
3.3
3.31
0 10 20 30 40 50 60 70 80
Load Current (mA)
Output Voltage (V) .
85°C
25°C
0°C
-40°C
0
100
200
300
400
500
600
700
0 20 40 60 80 100 120 140 160
Load Current (mA)
Dropout Voltage (mV) .
85°C
25°C 0°C
-40°C
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AS1360
Datasheet - Typica l O p e r a ting Ch a r a c t e r isti cs
Figure 9. Load Regulation vs. Temperature Figure 10. Line Regulation vs. Temperature
0.5
0.7
0.9
1.1
1.3
1.5
1.7
1.9
2.1
2.3
2.5
-40 -15 10 35 60 85
Temperature (°C)
Load Regulation (%) .
VIN = 10V
VIN = 4.3V
VIN = 6V
-1.2
-1
-0.8
-0.6
-0.4
-0.2
0
0.2
-40 -15 10 35 60 85
Temperature (°C)
Line Regulation (%/V) .
150mA
40mA
1mA / 10mA
Figure 11. Output Voltage vs. Input Voltage; Dropout Figure 12. Startup Rise Time
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2
1.2 1.4 1.6 1.8 2 2.2 2.4 2.6
Input Voltage (V)
Output Voltage (V)
Iload = 40mA
Iload = 100mA
50µs/Div
VOUT
500mV/Div
Figure 13. Startup Delay
Note: All graphs where measured without additional heat sinks, with
the SOT23 package mounted on a 4-layer PCB. Adding addi-
tional heat sinks will improve performance in high temperature
enviroment.
500µs/Div
VIN
1V/Div
VOUT
1V/Div
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AS1360
Datasheet - D e t a i l e d Descr i p t i o n
8 Detailed Description
The AS1360 is a low-power, positive voltage regulator designed in such a way that the supply current is independent from the load current. The
device regulates the output by comparing the output voltage to an internally generated reference voltage.
The device is available in fixed output voltages of 1.8, 2.5, 3.0, 3.3, and 5.0V. Fixed output voltages are generated using the internal resistor
divider network (see Figure 1 on page 1).
Short Circuit/Overcurrent Protection
The AS1360 monitors current flow through the p-channel MOSFET. In short-circuit or overcurrent conditions, the integrated short-circuit protec-
tion circuitry will limit output current.
Note: Thermal Dissipation according to Absolute Maximum Ratings on page 3 must be considered.
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AS1360
Datasheet - A p p l i c a t ion In f o r m a t i on
9 Application Information
Figure 14. AS1360 - Typical Application Diagram
Power Dissipation
Power dissipation (PD) of the AS1360 is the sum of the power dissipated by the p-channel MOSFET and the quiescent current required to bias
the internal voltage reference and the internal power amplifier, and is calculated as:
PD (P-Channel MOSFET) = (VIN - VOUT)IOUT (EQ 1)
Internal power dissipation as a result of the bias current for the internal voltage reference and the error amplifier is calculated as:
PD (Bias) = VINIGND (EQ 2)
Total AS1360 power dissipation is calculated as:
PD(Total) = PD (P-Channel MOSFET) + PD (Bias) (EQ 3)
The internal quiescent bias current (2µA, typ) is such that the PD(Bias) term of (EQ 3) can be disregarded and the maximum power dissipation
can be estimated using VIN(MAX) and VOUT(MIN) to obtain a maximum voltage differential between VIN and VOUT, and multiplying the maxi-
mum voltage differential by the maximum output current:
PD = (VIN(MAX)VOUT(MIN))IOUT(MAX) (EQ 4)
Where:
VIN = 3.3 to 4.1V
VOUT = 3.0V ±2%
IOUT = 1 to 100mA
TAMB(MAX) = 55ºC
PMAX = (4.1V - (3.0V x 0.98)) x 100mA = 116.0mW
Junction Temperature
The AS1360 junction temperature (TJ) can be determined by first calculating the thermal resistance from junction temperature-to-ambient tem-
perature.
Note: Thermal resistance is estimated to be the junction temperature-to-air temperature RΦJA, and is approximately 230°C/W or 335ºC/W
(when mounted on 1 square inch of copper). RΦJA will vary depending on PCB layout, air-flow and application specific conditions.
The AS1360 junction temperature is determined by calculating the rise in TJ above TAMB, and then adding the increase of TAMB:
TJ = PD(MAX) x R
Φ
JA + TAMB (EQ 5)
From (EQ 5), the value of TJ can be calculated as:
TJ = 116.0mW x 230ºC/W + 55ºC
Therefore:
TJ = 81.68ºC
AS1360
+9V
Alkaline
Battery
GND 1
3
VIN
2
VOUT COUT
1µF
*
CIN
1µF
*
*
Tantalum Capacitor
VOUT = 3.3V
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AS1360
Datasheet - A p p l i c a t ion In f o r m a t i on
External Component Selection
Input Capacitor
In applications where input impedance is approximately 10Ω, a 1µF capacitor is sufficient for CIN (see Figure 14 on page 8).
In cases where the AS1360 is operated from a battery, or when there is significant distance between the input source to the AS1360, larger val-
ues for CIN may be required for output stability.
Note: For values of COUT > 1µF, the value of CIN should be increased to prevent high source-impedance oscillations.
Output Capacitor
In most applications for the AS1360, a 1µF capacitor (ESR > 0.1Ω/< 5Ω, fRES > 1MHz) is sufficient for COUT (see Figure 14 on page 8).
For improved power supply noise rejection and device transient response, larger values can be used for COUT.
Note: For values of COUT > 1µF, the input impedance must not be so large that it causes high-input impedance oscillations.
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AS1360
Datasheet - O r d e r i n g Informa t i o n
11 Ordering Information
The device is available as the standard products shown in Table 5.
Note: All products are RoHS compliant.
Buy our products or get free samples online at ICdirect: http://www.austriamicrosystems.com/ICdirect
Technical Support is found at http://www.austriamicrosystems.com/Technical-Support
For further information and requests, please contact us mailto:sales@austriamicrosystems.com
or find your local distributor at http://www.austriamicrosystems.com/distributor
Table 5. Ordering Information
Ordering Code Marking Description Delivery Form Package
AS1360-18-T ASKD HV low-quiescent current LDO, 1.8V Tape and Reel 3-pin SOT23
AS1360-21-T ASRO HV low-quiescent current LDO, 2.1V Tape and Reel 3-pin SOT23
AS1360-25-T ASKE HV low-quiescent current LDO, 2.5V Tape and Reel 3-pin SOT23
AS1360-30-T ASKF HV low-quiescent current LDO, 3.0V Tape and Reel 3-pin SOT23
AS1360-33-T ASKG HV low-quiescent current LDO, 3.3V Tape and Reel 3-pin SOT23
AS1360-40-T ASQV HV low-quiescent current LDO, 4.0V Tape and Reel 3-pin SOT23
AS1360-45-T ASTQ HV low-quiescent current LDO, 4.5V Tape and Reel 3-pin SOT23
AS1360-50-T ASKH HV low-quiescent current LDO, 5.0V Tape and Reel 3-pin SOT23
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AS1360
Datasheet
Copyrights
Copyright © 1997-2011, austriamicrosystems AG, Tobelbaderstrasse 30, 8141 Unterpremstaetten, Austria-Europe. Trademarks Registered ®.
All rights reserved. The material herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of
the copyright owner.
All products and companies mentioned are trademarks or registered trademarks of their respective companies.
Disclaimer
Devices sold by austriamicrosystems AG are covered by the warranty and patent indemnification provisions appearing in its Term of Sale.
austriamicrosystems AG makes no warranty, express, statutory, implied, or by description regarding the information set forth herein or regarding
the freedom of the described devices from patent infringement. austriamicrosystems AG reserves the right to change specifications and prices at
any time and without notice. Therefore, prior to designing this product into a system, it is necessary to check with austriamicrosystems AG for
current information. This product is intended for use in normal commercial applications. Applications requiring extended temperature range,
unusual environmental requirements, or high reliability applications, such as military, medical life-support or life-sustaining equipment are
specifically not recommended without additional processing by austriamicrosystems AG for each application. For shipments of less than 100
parts the manufacturing flow might show deviations from the standard production flow, such as test flow or test location.
The information furnished here by austriamicrosystems AG is believed to be correct and accurate. However, austriamicrosystems AG shall not
be liable to recipient or any third party for any damages, including but not limited to personal injury, property damage, loss of profits, loss of use,
interruption of business or indirect, special, incidental or consequential damages, of any kind, in connection with or arising out of the furnishing,
performance or use of the technical data herein. No obligation or liability to recipient or any third party shall arise or flow out of
austriamicrosystems AG rendering of technical or other services.
Contact Information
Headquarters
austriamicrosystems AG
Tobelbaderstrasse 30
A-8141 Unterpremstaetten, Austria
Tel: +43 (0) 3136 500 0
Fax: +43 (0) 3136 525 01
For Sales Offices, Distributors and Representatives, please visit:
http://www.austriamicrosystems.com/contact
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