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AAT1141

FastTransient 600mA Step-Down Converter

DATA SHEET

Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

201979B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 15, 2013

Functional Description

The AAT1141 is a high performance 600mA 2MHz mono-

lithic step-down converter. It has been designed with the

goal of minimizing external component size and optimiz-

ing efficiency over the complete load range. 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).

The fixed output version requires only three external

sion can be programmed with external feedback to any

voltage, ranging from 0.6V to the input voltage. An addi-

tional feed-forward capacitor can also be added to the

external feedback to provide improved transient response

(see Figure 1).

At dropout, the converter duty cycle increases to 100%

and the output voltage tracks the input voltage minus

The input voltage range is 2.7V to 5.5V. The converter

efficiency has been optimized for all load conditions,

ranging from no load to 600mA.

The internal error amplifier and compensation provides

excellent transient response, load, and line regulation.

Soft start eliminates any output voltage overshoot when

the enable or the input voltage is applied.

Functional Block Diagram

EN

LX

Err

.

Amp

Logic

DH

DL

GND

IN

OUT

Voltage

Reference

INPUT

See note

Note: For adjustable version, the internal feedback divider is omitted and the OUT pin is tied directly

to the internal error amplifier.