Datasheet > AAT4672

AAT4672

更新时间： 2022-04-23 23:00:11

品牌	Logo	应用领域
ANALOGICTECH		开关
页数	文件大小	规格书
24页	1259K
描述
Power Supply Selector Switch

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中文翻译

获取价格

数据手册

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AAT4672 数据手册

PRODUCT DATASHEET

AAT4672

SmartSwitch

Power Supply Selector Switch

Functional Block Diagram

Switch 1

MAIN

OUT

IMAIN

Thermal

and Current

Sense

Logic

Control

PWRSEL

IAUX

GND

AUX

Switch 2

Truth Table

Y = Yes, N = No, X = don’t care.

Input Conditions

V_AUX> UVLO

AAT4672

V_MAIN> UVLO

V_MAIN> V_AUX+ 0.2V

V_OUT

Floating

V_MAIN

V_AUX

V_MAIN

V_AUX

Functional Description

Applications Information

To power the OUT pin, at least one of the two input sup-

plies (MAIN/AUX) must be greater than the UVLO thresh-

old. If only one supply is greater than the UVLO thresh-

old, the load will be connected to that particular supply

when the device is enabled. If both supplies are above

the UVLO threshold, the AAT4672 will connect the supply

from the MAIN pin to the OUT pin when the device is

enabled and the MAIN voltage is greater than the AUX

voltage plus 0.2V (typical); otherwise, the AAT4672 will

connect the supply from the AUX pin to the OUT pin.

Input Capacitors

A 1µF or greater capacitor is generally recommended

between MAIN and GND (C_MAIN), and between AUX and

GND (C_AUX). An input capacitor is not required for basic

operation; however, it is useful in preventing load tran-

sients from affecting up-stream circuits. Ceramic, tanta-

lum, or aluminum electrolytic capacitors may be selected

for C_MAIN/C_AUX. There is no specific capacitor equivalent

series resistance (ESR) requirement for C_MAIN/C_AUX

However, for higher current operation, ceramic capaci-

tors are recommended for C_MAIN/C_AUXdue to their inher-

ent capability over tantalum capacitors to withstand

The two internal power switches are current limited; the

current limits are programmed by the resistors on the

IMAIN and IAUX pins respectively.

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