AS1371

400mA, Low Input Vo ltage, Low Quiescent Current LDO

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Revision 1.04

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Datasheet

1 General Description

The AS1371 low input voltage, positive voltage regulator

is designed to deliver up to 400mA while consuming

typically only 15µA of quiescent current. The device

operates from input voltages of 1.2V to 3.6V, and is

available in fixed output voltages between 0.6V and

3.3V (programmable in 50mV steps).

Operation at the full 400mA load current is dependent

upon the maximum power dissipation available from

package and environment.

The low input voltage and ultra-low dropout voltage

(20mV @ 100mA load and 80mV @ 400mA load)

supports

single

primary

cell

operation

in

small

applications, when operated with minimum input-to-

output voltage differentials. In addition, the regulator

provides a power management life extension by

operating from pre-existing 1.8V and 2.5V outputs to

provide low output voltages for new generation portable

processor cores.

The device features stable output voltage with ceramic

capacitors down to a value of 1µF, strict output voltage

regulation tolerances (±1%), and good line- and load-

regulation.

The AS1371 is available in a 6-pin 2x2 TDFN package

and is qualified for -40°C to +85°C operation.

2 Key Features

!

Ultra-Low Dropout Voltage: 20mV @ 100mA load

!

Operating Input Voltage Range: 1.2V to 3.6V

!

Output Voltages: 0.6V to 3.3V in 50mV steps

!

Max. Output Current: 400mA

!

Output Voltage Accuracy: ±1%

!

Low Shutdown Current: 10nA

!

Low Quiescent Current: 50µA @ max load

!

Integrated Overtemperature/Overcurrent Protection

!

Under-Voltage Lockout Feature

!

Chip Enable Input

!

Power-OK and Low Battery Detection

!

Sense Input Option

!

Minimal External Components Required

!

Operating Temperature Range: -40°C to +85°C

!

6-pin 2x2 TDFN Package

3 Applications

The devices are ideal for powering cordless and mobile

phones, MP3 players, CD and DVD players, PDAs,

hand-held computers, digital cameras, and any other

hand-held and/or battery-powered device.

Figure 1. AS1371 - Typical Application Diagram

Input

1.2V to 3.6V

1µF

ON

OFF

100k

Ω

1µF

Output

0.6V to 3.3V

IN

EN

GND

SENSE

OUT

AS1371

POK