AAT1120 Просмотр технического описания (PDF) - Advanced Analogic Technologies

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AAT1120

500mA Step-Down Converter

Advanced Analogic Technologies 

Functional Block Diagram

FB

VIN

AAT1120

500mA Step-Down Converter

VP

Err

Amp

Voltage

Reference

EN

INPUT

DH

Logic

LX

DL

GND

PGND

Functional Description

The AAT1120 is a high performance 500mA,

1.5MHz monolithic step-down converter designed

to operate with an input voltage range of 2.7V to

5.5V. The converter operates at 1.5MHz, which

minimizes the size of external components. Typical

values are 3.3μH for the output inductor and 4.7μF

for the ceramic output capacitor.

The device is designed to operate with an output

voltage as low as 0.6V. Power devices are sized for

500mA current capability while maintaining over

90% efficiency at full load. Light load efficiency is

maintained at greater than 80% down to 1mA of

load current.

At dropout, the converter duty cycle increases to

100% and the output voltage tracks the input volt-

age minus the RDS(ON) drop of the P-channel high-

side MOSFET.

A high-DC gain error amplifier with internal com-

pensation controls the output. It provides excellent

transient response and load/line regulation. Soft

start eliminates any output voltage overshoot when

the enable or the input voltage is applied.

1120.2007.01.1.0

9

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