Datasheet > A4491

A4491

更新时间： 2024-09-19 12:51:19

品牌	Logo	应用领域
急速微 - ALLEGRO		/
页数	文件大小	规格书
16页	399K
描述
Designed to provide the power supply requirements of printers, office automation, industrial, and portable equipment, the A4491 provides three high current,

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A4491 数据手册

A4491

Triple Output Step-Down Switching Regulator

Features and Benefits

Description

▪ Three buck converters in a single package

▪ 4.5 to 23 V input voltage range

Designedtoprovidethepowersupplyrequirementsofprinters,

office automation, industrial, and portable equipment, the

A4491providesthreehighcurrent,highperformance,switching

regulator outputs in a single package, saving space, cost and

component count.

▪ 550 kHz fixed frequency

▪ Multiphase switching for smaller components and

lower EMI

▪ Independent control of each converter for sequencing and

shutdown control

▪ Power-on-reset flag with adjustable delay

▪ Internal compensation to minimize components and

simply design

High frequency switching allows selection of inexpensive

inductors and small ceramic output capacitors. The turn-on

cycles of the regulators are interleaved to minimize stresses on

the input capacitors and to reduce EMI. Independent Enable

pins simplify power sequencing and shutdown capabilities,

and a power-on-reset (POR) circuit with user configurable

delay indicates when enabled regulators are in specification.

▪ 4 × 4 mm QFN Package, small PCB footprint

Continued on the next page…

Package: 20-contact QFN (suffix ES)

Applications:

▪ Photo, inkjet, and portable printers

• Set-top boxes

• Tablet computing

• Other Consumer Electronics applications

• Point-of-sale applications

• Security systems

Approximate size

• Gaming machines

• Other Industrial applications

Typical Application

V_BB

VDD

CP1 CP2 VCP

VBB1

LX1

PORZ

CPOR

REG1

REG2

FB1

A4491

Microcontroller or

Controller Logic

VBB2

ENB1

ENB2

ENB3

LX2

FB2

VBB3

PGND

GND

LX3

FB3

REG3

4491-DS, Rev. 1

12 3 4 5 6 7...16

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