AS1353
,
AS1356
L i n e a r L o w - D r o p o u t 1 5 0 m A Vo l ta g e R e g u l a t o r s
Product Brief
1 General Description
The AS1353/AS1356 are high-performance, fixed-volt-
age linear LDOs designed for use with capacitors of 1 to
10µF. The devices can deliver superior performance
even under low dropout conditions when the power tran-
sistor operates in linear mode.
The integrated P-channel MOSFET output allows the
devices to maintain a low supply-current at loads of up
to150mA. A shutdown mode includes logic-controlled
circuitry which reduces shutdown current to less than
1µA (max).
Integrated over-temperature and over-current protec-
tion circuitry switches the devices off in case of thermal
overload or output short-circuit conditions.
The AS1353/AS1356 are optimized for low equivalent-
series resistance (ESR) output capacitors. Additionally,
all devices contain reversed battery protection which dis-
connects the internal circuitry and parasitic diodes if the
battery is connected incorrectly.
The AS1356 also features power-OK circuitry which can
be used to monitor output regulation.
All devices also feature an integrated error amplifier and
built-in 1.25V reference, and output current is limited
(380mA typ) via the on-chip current limiting circuitry.
Multiple output voltages are available as standard prod-
ucts: 3.6, 3.3, 3.0, 2.7, 2.5, or 1.5V. All devices are avail-
able in a 5-pin SOT23 package.
2 Key Features
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Ultra-Low Dropout Voltage: 40mV @ 100mA load
Output Voltage Range: +1.5 to +3.6V (100mV steps)
Max Output Current: 150mA
Output Voltage Accuracy: ±1%
Low Shutdown Current: 1µA
High PSRR: 60dB at 100Hz
Integrated Overtemperature/Overcurrent Protection
Reverse-Battery Protection (AS1353/AS1356)
Power-OK Output (AS1356)
Minimal External Components Required
Operating Temperature Range: -40 to +85°C
5-pin SOT23 Package
3 Applications
The devices are ideal for powering cordless and mobile
phones, MP3 players, CD and DVD players, PDAs,
handheld computers, digital cameras, and any other
hand-held and/or battery-powered device.
Figure 1. Pinout and Application Diagrams
IN 1
GND 2
SHDNM
3
5 OUT
IN 1
GND 2
5 OUT
AS1353
4 BP
AS1356
4 POK
SHDNM
3
+2.5 to
+5.5V
IN
C
IN
1µF
OUT
AS1353
SHDNM
BP
GND
C
OUT
1µF
Preset Output
1.5 to 3.6V,
150mA
+2.5 to
+5.5V
IN
C
IN
1µF
OUT
C
OUT
1µF
Preset Output
1.5 to 3.6V,
150mA
AS1356
On
Off
SHDNM
GND
POK
100kΩ
To Micro-
processor
On
Off
C
BP
0.01µF
www.austriamicrosystems.com
Revision 1.03
1-2
AMSCO [ AUSTRIAMICROSYSTEMS AG ]
