Datasheet > A4490_12

A4490_12

更新时间： 2024-11-08 12:51:19

品牌	Logo	应用领域
急速微 - ALLEGRO		/
页数	文件大小	规格书
17页	397K
描述
Designed to provide the power supply requirements of printers, office automation, industrial, and portable equipment, the A4490 provides three high current,

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A4490_12 数据手册

A4490

Triple Output Step-Down Switching Regulator

Features and Benefits

▪ Three buck converters

▪ 4.5 to 34 V input voltage range

▪ 550 kHz fixed frequency

▪ Multiphase switching

Description

Designedtoprovidethepowersupplyrequirementsofprinters,

office automation, industrial, and portable equipment, the

A4490providesthreehighcurrent,highperformance,switching

regulator outputs with independent soft start.

▪ Independent control of each converter

▪ Power-on-reset flag

▪ Internal compensation

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.Acharge pump is used

to provide the supply for driving the power switches, ensuring

operation at very wide operating duty cycles and avoiding the

need for power-draining clamp circuits.

▪ 4 × 4 mm QFN Package, small PCB footprint

Apower-on-resetcircuitwithuserconfigurabledelayindicates

when enabled regulators are in specification. The power-on-

reset flag also indicates when the input voltage drops below

specification, giving the system controller advance warning

while the switchers continue to operate down to the shutdown

level.

Package: 20-contact QFN (suffix ES)

Internaldiagnosticsprovidecomprehensiveprotectionagainst

overloads, input undervoltages, and overtemperatures.

Continued on the next page…

Approximate size

Typical Application

V_BB

VDD

CP1 CP2 VCP

VBB1

LX1

PORZ

CPOR

REG1

REG2

FB1

A4490

Microcontroller or

Controller Logic

VBB2

ENB1

ENB2

ENB3

LX2

FB2

VBB3

PGND

GND

LX3

FB3

REG3

4490-DS, Rev. 10

12 3 4 5 6 7...17

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