General Description

The MAX4772/MAX4773 switches feature selectable

internal current limiting to prevent damage to host

devices

due

to

faulty

load

conditions.

The

MAX4772/MAX4773 include a logic input to select a

guaranteed 200mA or 500mA current limit, making them

ideal for SDIO and other load-switching applications.

These analog switches have a low 0.2

Ω on-resistance

and operate from a 2.0V to 4.5V input voltage range.

When the switch is on and a load is connected to the

port, a guaranteed blanking time of 14ms ensures that

the transient voltage settles down. If, after this blanking

time, the load current is greater than the current limit,

the MAX4772 switch is turned off and issues a FLAG to

the microprocessor. The switch can be turned on again

by cycling the power or the ON input.

The MAX4773 has an autoretry feature where the switch

turns off and issues a FLAG to the microprocessor after

the blanking time and then continuously checks to see if

the overload condition is present. The switch remains

on after the overload condition disappears and FLAG

deasserts.

The MAX4772/MAX4773 are available in tiny space-sav-

ing 6-pin SOT23 and 6-pin TDFN (3mm x 3mm) pack-

ages.

Applications

SDIO

PDAs and Palmtop Devices

Cell Phones

GPS Systems

Hand-Held Devices

Features

o Guaranteed Current Limit: 200mA or 500mA

o Thermal-Shutdown Protection

o Reverse-Current Protection

o 0.2Ω On-Resistance (SEL = High)

o 14ms Guaranteed Blanking Time

o FLAG Function

o Autoretry (MAX4773)

o 80µA Supply Current

o 6µA Latch-Off Current (MAX4772)

o 0.01µA Shutdown Current

o 2.0V to 4.5V Supply Range

o Fast Current-Limit Response Time

o Tiny SOT23 and TDFN Packages

o UL Certification Pending

200mA/500mA Selectable

Current-Limit Switches

________________________________________________________________ Maxim Integrated Products

1

Ordering Information

2.0V TO 4.5V

IN

OUT

FLAG

GND

ON

µP

TO SDIO PORT

MAX4772

MAX4773

SEL

Typical Operating Circuit

19-2926; Rev 0; 7/03

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

PART

TEMP RANGE

PIN-

PACKAGE

TOP

MARK

MAX4772EUT-T

-40°C to +85°C

6 SOT23-6

ABND

MAX4772ETT*

-40°C to +85°C

6 TDFN-EP**

—

MAX4773EUT-T

-40°C to +85°C

6 SOT23-6

ABNE

MAX4773ETT*

-40°C to +85°C

6 TDFN-EP**

—

Selector Guide

PART

AUTORETRY

MAX4772EUK-T

No

MAX4772ETT

No

MAX4773EUK-T

Yes

MAX4773ETT

Yes

GND

IN

MAX4772

MAX4773

SOT23

TOP VIEW

2

ON

OUT

IN

MAX4772

MAX4773

TDFN

2

SEL

Pin Configurations

*Future product—contact factory for availability.

**EP—Exposed pad.