AAT3218IGV-3.0-T1 데이터 시트보기 (PDF) - Advanced Analogic Technologies

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AAT3218IGV-3.0-T1

150mA MicroPower™ High Performance LDO

Advanced Analogic Technologies 

AAT3218

150mA MicroPower™ High Performance LDO

Functional Block Diagram

IN

OUT

Active

Feedback

Control

Over-Current

Protection

Over-

Temperature

Protection

+

Error

Amplifier

-

Fast-

EN

Start

Control

Voltage

Reference

BYP

Functional Description

The AAT3218 is intended for LDO regulator appli-

cations where output current load requirements

range from no load to 150mA. The advanced cir-

cuit design of the AAT3218 has been specifically

optimized for very fast start-up and shutdown tim-

ing. This proprietary CMOS LDO has also been

tailored for superior transient response characteris-

tics. 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 AAT3218

is enabled through the implementation of a fast-

start control circuit, which accelerates the power-

up behavior of fundamental control and feedback

circuits within 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 shutdown

mode. This active fast shutdown circuit has no

adverse effect on normal device operation.

The AAT3218 has very fast transient response

characteristics, which is an important feature for

applications where fast line and load transient

response are required. This rapid transient

8

GND

response behavior is accomplished through the

implementation of an active error amplifier feed-

back control. This proprietary circuit design is

unique to this MicroPower LDO regulator.

The LDO regulator output has been specifically

optimized to function with low-cost, low-ESR

ceramic capacitors. However, the design will allow

for operation over a wide range of capacitor types.

A bypass pin has been provided to allow the addi-

tion 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 to this pin. However,

increased CBYPASS values 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

AAT3218 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 maxi-

mum output current loads.

3218.2006.04.1.8

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