MAX14544ETA+T【PDF 1/10 页】IC ACCY SWITCH OVP PROTECT 8TDFN

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_______________________________________________________________ Maxim Integrated Products 1

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxims website at www.maxim-ic.com.

28V-Capable, I

LIM

BUS

Accessory Switch

General Description

The MAX14544/MAX14545 are overcurrent detection

switches that can provide power to external accesso-

ries while preventing the host device from damage due

to faulty overload conditions. These analog switches

feature a 270m?(typ) on-resistance and operate from

a +2.3V to +5.5V input voltage range. The selectable

current limit of 200mA or 400mA makes them ideal for

load-switching applications.

The MAX14544 has an autoretry feature, whereas the

MAX14545 has a latchoff feature. When the switch is off,

OUT can withstand 28V maximum. When the switch is on

and a load is connected to the port, a blanking time of

10.5ms ensures that the transient voltage settles down.

After this blanking time, if the voltage across the switch is

greater than the FLAG assertion voltage, the switch turns

off and then a FLAG is issued to the microprocessor.

After the retry time, the device recloses for the duration

of the blanking time to check if the load current is lower

than the limit. The MAX14544 repeats this cycle if the

overload condition is present. During the cycle, FLAG

remains asserted. The MAX14544 remains on after the

overload condition is removed and FLAG deasserts. For

the MAX14545, after the blanking time, the switch turns

off and then a FLAG is issued to the microprocessor. The

switch can be turned on again by cycling the power or

the EN input.

The MAX14544/MAX14545 have additional safety fea-

tures that include thermal shutdown protection, reverse-

current blocking, and overvoltage protection.

The MAX14544/MAX14545 are offered in a space-sav-

ing, 8-pin, 2mm x 2mm TDFN package, and operate over

the -40NC to +85NC extended temperature range.

Applications

Cell Phones

MP3 Players

PDAs

Digital Cameras

eBook

MID

Features

S 200mA or 400mA Selectable Current Limit

S Output Capable of Withstanding +28V

S Reverse-Current Shutdown Protection

S +2.3V to +5.5V Input Operation Range

S Undervoltage Lockout

S Autoretry or Latchoff Option

S Thermal Shutdown Protection

S 0.1?/SPAN>A (typ) Shutdown Current

S 5?/SPAN>s Fast Current-Limit Detect

S 8-Pin TDFN (2mm x 2mm) Package

S -40NC to +85NC Operating Temperature Range

19-5037; Rev 0; 1/10

Pin Configuration

Ordering Information/

Selector Guide

Note: All devices are specified over the -40癈 to +85癈 tem-

perature range.

+Denotes a lead(Pb)-free/RoHS-compliant package.

T = Tape and reel.

*EP = Exposed pad.

Typical Operating Circuit appears at end of data sheet.

*EP

*CONNECT EXPOSED PAD TO GND.

OUT

7 OUT

ISET

GND

TDFN

MAX14544

MAX14545

TOP VIEW

FLAG

PART

PIN-

PACKAGE

TOP

MARK

RETRY/

LATCHOFF

MAX14544ETA+T

8 TDFN-EP*

ACY

Autoretry

MAX14545ETA+T

8 TDFN-EP*

ACZ

Latchoff

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