General Description

The MAX4970/MAX4971/MAX4972 family of overvolt-

internal FET and protect low-voltage systems against

voltage faults up to +28V. These devices also drive an

optional external pFET to protect against reverse-polari-

ty input voltages. When the input voltage exceeds the

overvoltage threshold, the internal FET is turned off to

prevent damage to the protected components.

All switches feature a 2.3A (min) current-limit protec-

tion. During a short-circuit occurrence, the device oper-

ates in an autoretry mode where the internal MOSFET is

turned on to check if the fault has been removed. The

autoretry interval time is 15ms, and if the fault is

removed, the MOSFET remains on.

The MAX4970/MAX4971/MAX4972 feature an enable

input (

EN) that controls the operation of the internal

nFET as well as the optional external pFET. The use of

EN allows the external pFET to block reverse voltages

independent of any signal present at the output.

The overvoltage thresholds (OVLO) are preset to

4.65V (MAX4972), 5.8V (MAX4970), or 6.35V (MAX4971).

The undervoltage thresholds (UVLO) are preset to 2.45V.

When the input voltage drops below the UVLO, the

devices enter a low-current standby mode.

All devices are offered in a small 12-bump, WLP pack-

age and operate over the -40°C to +85°C extended

temperature range.

Applications

Cell Phones

Digital Still Cameras

PDAs and Palmtop Devices

MP3 Players

Features

♦ Input Voltage Protection up to +28V

♦ Integrated nFET Switch

♦ Reverse Voltage Protection with External pFET

♦ Enable Input

♦ Preset Overvoltage Protection Trip Level

5.8V (MAX4970)

6.35V (MAX4971)

4.65V (MAX4972)

♦ Low-Current Undervoltage-Lockout Mode

♦ Short-Circuit Protection (Autoretry)

♦ Internal 15ms Startup Delay and Retry Times

♦ Input-Voltage Power-Good Logic Output

♦ Thermal-Shutdown Protection

♦ 2mm x 1.5mm, 12-Bump WLP Package

Overvoltage-Protection Controllers

________________________________________________________________

Maxim Integrated Products

1

Ordering Information/Selector Guide

19-4139; Rev 1; 8/08

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.

Note: All devices are specified over the -40°C to +85°C operating temperature range.

+

Denotes a lead-free/RoHS-compliant package.

T

= Tape-and-reel package.

Typical Operating Circuit appears at end of data sheet.

PART

PIN-PACKAGE

TOP MARK

PACKAGE CODE

UVLO (V)

OVLO (V)

ACOK ACTION

MAX4970EWC+T

12 WLP

AAA

W121A2+1

2.45

5.8

UVLO only

MAX4971EWC+T

12 WLP

AAB

W121A2+1

2.45

6.35

UVLO only

MAX4972EWC+T

12 WLP

AAC

W121A2+1

2.45

4.65

UVLO and OVLO

Pin Configuration

MAX4970/MAX4971/MAX4972

OUT

OUT

OUT

OUT

GP

IN

IN

GND

IN

IN

123

4

A

B

C

WLP

EN

ACOK