AAT1147IJS-0.6-T1 データシートの表示（PDF） - Analog Technology Inc

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AAT1147IJS-0.6-T1

High Efficiency, Low Noise, Fast Transient 400mA Step-Down Converter

Analog Technology Inc 

AAT1147

High Efficiency, Low Noise, Fast Transient

400mA Step-Down Converter

Functional Block Diagram

OUT

VIN

Err

Am. p

Voltage

Reference

EN

INPUT

DH

Logic

DL

LX

PGND

AGND

Functional Description

The AAT1147 is a high performance 400mA

1.4MHz monolithic step-down converter. It has

been designed with the goal of minimizing external

component size and optimizing efficiency at heavy

load. Apart from the small bypass input capacitor,

only a small L-C filter is required at the output.

Typically, a 4.7µH inductor and a 4.7µF ceramic

capacitor are recommended (see table of values).

Only three external power components (CIN, COUT,

and L) are required. Output voltage is programmed

with external resistors and ranges from 0.6V to the

input voltage. An additional feed-forward capacitor

can also be added to the external feedback to pro-

vide improved transient response (see Figure 1).

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.

The input voltage range is 2.7V to 5.5V. The con-

verter efficiency has been optimized for heavy load

conditions up to 400mA.

The internal error amplifier and compensation pro-

vide excellent transient response, load, and line

regulation. Soft start eliminates any output voltage

overshoot when the enable or the input voltage is

applied.

8

1147.2006.05.1.0

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