AAT3238IGU-2.8-T1(2006) 데이터 시트보기 (PDF) - Advanced Analogic Technologies

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AAT3238IGU-2.8-T1
(Rev.:2006)

300mA MicroPower™ High Performance LDO Linear Regulator

Advanced Analogic Technologies 

Functional Block Diagram

AAT3238

300mA MicroPower™

High Performance LDO Linear Regulator

IN

OUT

Active

Feedback

Control

Error +

Amplifier

-

Over-Current

Protection

Over-

Temperature

Protection

Fast

EN

Start

Control

Voltage

Reference

BYP

Functional Description

The AAT3238 is intended for LDO regulator applica-

tions where output current load requirements range

from no load to 300mA.

The advanced circuit design of the AAT3238 has

been specifically optimized for very fast start-up and

shutdown timing. This proprietary CMOS LDO has

also been tailored for superior transient response

characteristics. These traits are particularly important

for applications that require fast power supply timing,

such as GSM cellular telephone handsets.

The high-speed turn-on capability of the AAT3238 is

enabled through the implementation of a fast start

control circuit, which accelerates the power-up behav-

ior of fundamental control and feedback circuits with-

in the LDO regulator.

Fast turn-off response time is achieved by an active

output pull-down circuit, which is enabled when the

LDO regulator is placed in the shutdown mode. This

active fast shutdown circuit has no adverse effect on

normal device operation.

The AAT3238 has very fast transient response char-

acteristics, which is an important feature for applica-

tions where fast line and load transient response is

8

GND

required. This rapid transient response behavior is

accomplished through the implementation of an

active error amplifier feedback control. This propri-

etary circuit design is unique to this MicroPower LDO

regulator.

The LDO regulator output has been specifically opti-

mized to function with low-cost, low-ESR ceramic

capacitors. However, the design will allow for opera-

tion over a wide range of capacitor types.

A bypass pin has been provided to allow the addition

of an optional voltage reference bypass capacitor to

reduce output self noise and increase power supply

ripple rejection. Device self noise and PSRR will be

improved by the addition of a small ceramic capacitor

in this pin. However, increased values of CBYPASS

may slow down the LDO regulator turn-on time.

This LDO regulator has complete short-circuit and

thermal protection. The integral combination of these

two internal protection circuits gives the AAT3238 a

comprehensive safety system to guard against

extreme adverse operating conditions. Device power

dissipation is limited to the package type and thermal

dissipation properties. Refer to the Thermal

Considerations section of this datasheet for details on

device operation at maximum output current loads.

3238.2006.11.1.6

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