AAT1162 데이터 시트보기 (PDF) - Advanced Analogic Technologies

부품명

상세내역

일치하는 목록

AAT1162

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

Advanced Analogic Technologies 

SwitchRegTM

Functional Block Diagram

PRODUCT DATASHEET

AAT1162

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

LDO

AIN

Note 1

FB

Current

Sense Amp +

LDO

-

+

Error

Amp -

+

-

Current

Mode

Comparator

Control

Logic

Reference

EN

IN

LX

PGND

AGND

DGND

COMP

Note 1: For fixed output voltage versions, FB is connecte. d to the

error amplifier through the resistive voltage divider shown.

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.

1162.2008.01.1.3

www.analogictech.com

9

Share Link: