AS1353

Linear Low-Dropout 150mA Vo ltage Regulators

www.austriamicrosystems.com

Revision 1.03

1 - 2

Produ ct 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.

Figure 1. Pinout and Application Diagrams

2 Key Features

!

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.

AS1356

SHDNM

IN

OUT

POK

1µF

+2.5 to

+5.5V

1µF

100k

Ω

On

Off

Preset Output

1.5 to 3.6V,

150mA

To Micro-

processor

AS1353

BP

0.01µF

SHDNM

IN

OUT

1µF

+2.5 to

+5.5V

1µF

On

Off

Preset Output

1.5 to 3.6V,

150mA

GND

AS1353

3

BP

2

1

5

4

OUT

GND

SHDNM

IN

GND

AS1356

3

POK

2

1

5

4

OUT

GND

SHDNM

IN