9

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

201998B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 20, 2013

AAT1162

12V, 1.5A Step-Down DC/DC Converter

DATA SHEET

Functional Description

The AAT1162 is a current-mode step-down DC/DC con-

verter that operates over a wide 4V to 13.2V input volt-

age range and is capable of supplying up to 1.5A to the

load with the output voltage regulated as low as 0.6V.

Both the P-channel power switch and N-channel syn-

chronous rectifier are internal, reducing the number of

external components required. The output voltage is

adjusted by an external resistor divider; fixed output

voltage versions are available upon request. The regula-

tion system is externally compensated, allowing the cir-

cuit to be optimized for each application. The AAT1162

includes cycle-by-cycle current limiting, frequency fold-

back for improved short-circuit performance, and ther-

mal overload protection to prevent damage in the event

of an external fault condition.

Control Loop

The AAT1162 regulates the output voltage using con-

stant frequency current mode control. The AAT1162

monitors current through the high-side P-channel

MOSFET and uses that signal to regulate the output volt-

age. This provides improved transient response and

eases compensation. Internal slope compensation is

included to ensure the current “inside loop” stability.

Functional Block Diagram

Control

Logic

+

-

LDO

+

-

Reference

Note 1

FB

EN

AGND

DGND

PGND

LX

IN

AIN

LDO

COMP

Note 1: For fixed output voltage versions, FB is connected to the

error amplifier through the resistive voltage divider shown.

.

+

-

Current

Sense Amp

Error

Amp

Current

Mode

Comparator