General Description

The MAX4789–MAX4794 family of switches feature

internal current limiting to prevent damage to host

devices due to faulty load conditions. These analog

switches have a low 0.2Ω on-resistance and operate

from 2.3V to 5.5V input voltage range. They are avail-

able with guaranteed 200mA, 250mA, and 300mA cur-

rent limits, making them ideal for SDIO and other load

switching applications.

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

port, a guaranteed blanking time of 14ms ensures that

the transient voltages settle down. If after this blanking

time the load current is greater than the current limit,

the MAX4789, MAX4791, and MAX4793 enter a latch-

off state where the switch is turned off and

FLAG is

issued to the microprocessor. The switch can be turned

on again by cycling the power or the ON pin.

The MAX4790, MAX4792, and MAX4794 have an

autoretry feature where the switch turns off 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.

The MAX4789–MAX4794 are available in 6-pin 3mm x

3mm TDFN and tiny space-saving 4-pin SOT143 pack-

ages. The MAX4789/MAX4790/MAX4791/MAX4793 are

also available in a tiny 5-pin SOT23 package. For lower

current current-limiting switches, refer to the MAX4785–

MAX4788 data sheet.

Applications

PDAs and Palmtop Devices

Cell Phones

GPS Systems

Handheld Devices

SDIO

Features

♦ Guaranteed Current Limit: 200mA, 250mA, 300mA

♦ Thermal-Shutdown Protection

♦ Reverse Current Protection

♦ 0.2Ω On-Resistance

♦ 14ms Guaranteed Blanking Time

♦ FLAG Function (MAX4789/MAX4791/MAX4793)

♦ 80µA Supply Current

♦ 8µA Latch-Off Current

(MAX4789/MAX4791/MAX4793)

♦ 0.01µA Shutdown Current

♦ 2.3V to 5.5V Supply Range

♦ Undervoltage Lockout

♦ Fast Current-Limit Response Time (5µs)

♦ TDFN and SOT23/SOT143 Packages

200mA/250mA/300mA Current-Limit Switches

________________________________________________________________

Maxim Integrated Products

1

Ordering Information

2.3V TO 5.5V

IN

OUT

FLAG

GND

ON

μP

TO SDIO PORT

MAX4789

MAX4791

MAX4793

Typical Operating Circuit

19-2663; Rev 3; 10/08

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

or visit Maxim’s website at www.maxim-ic.com.

*EP = Exposed paddle.

+Denotes a lead-free/RoHS-compliant package.

T = Tape and reel.

Ordering Information continued at end of data sheet.

Selector Guide appears at end of data sheet.

PART

TEMP RANGE

PIN-

PACKAGE

TOP

MARK

MAX4789EUS+T

-40°C to +85°C

4 SOT143

KAFE

MAX4789EUK+T

-40°C to +85°C

5 SOT23

AEAC

MAX4789ETT+

-40°C to +85°C

6 TDFN-EP*

ABO

MAX4790EUS+T

-40°C to +85°C

4 SOT143

KAFF

MAX4790ETT+

-40°C to +85°C

6 TDFN-EP

ABP

GND

FLAG

Pin Configurations continued at end of data sheet.

IN

MAX4789

MAX4791

MAX4793

SOT23

TOP VIEW

2

34

ON

ON

OUT

MAX4789–

MAX4794

SOT143

23

GND

Pin Configurations