MAX4971EVKIT+ Maxim Integrated, MAX4971EVKIT+ Datasheet

MAX4971EVKIT+

Manufacturer Part Number

MAX4971EVKIT+

Description

Power Switch ICs - Power Distribution Overvoltage-Protection Controllers with a Low RON Internal FET

Manufacturer

Maxim Integrated

Datasheet

1.MAX4971EVKIT.pdf (9 pages)

Specifications of MAX4971EVKIT+

On Resistance (max)

90 mOhms

On Time (max)

13 ms

Off Time (max)

8 us

Operating Supply Voltage

2.2 V to 28 V

Maximum Power Dissipation

678 mW

Current page: 1 of 9
Download datasheet (157Kb)

The MAX4970/MAX4971/MAX4972 family of overvolt-

age protection devices features a low 40mΩ (typ) R

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.

19-4139; Rev 1; 8/08

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.

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.

MAX4970EWC+T

MAX4971EWC+T

MAX4972EWC+T

PART

Cell Phones

Digital Still Cameras

PDAs and Palmtop Devices

MP3 Players

________________________________________________________________ Maxim Integrated Products

12 WLP

PIN-PACKAGE

General Description

Overvoltage-Protection Controllers

Applications

TOP MARK

AAA

AAB

AAC

with a Low R

PACKAGE CODE

W121A2+1

Ordering Information/Selector Guide

♦ Input Voltage Protection up to +28V

♦ Integrated nFET Switch

♦ Reverse Voltage Protection with External pFET

♦ Enable Input

♦ Preset Overvoltage Protection Trip Level

♦ 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

Typical Operating Circuit appears at end of data sheet.

TOP VIEW

5.8V (MAX4970)

6.35V (MAX4971)

4.65V (MAX4972)

(BUMPS ON BOTTOM)

UVLO (V)

2.45

ACOK

GND

MAX4970/MAX4971/MAX4972

OUT

OVLO (V)

Internal FET

WLP

6.35

4.65

Pin Configuration

5.8

OUT

UVLO and OVLO

ACOK ACTION

OUT

UVLO only

Features

Related parts for MAX4971EVKIT+

MAX4971EVKIT+ Summary of contents

Page 1

... Note: All devices are specified over the -40°C to +85°C operating temperature range. + Denotes a lead-free/RoHS-compliant package Tape-and-reel package. ________________________________________________________________ Maxim Integrated Products 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. with a Low R ♦ ...

Page 2

Overvoltage-Protection Controllers with a Low R ON ABSOLUTE MAXIMUM RATINGS (Voltages referenced to GND.) IN ............................................................................-0.3V to +30V IN-GP.........................................................................(30V - 5.4V) OUT.............................................................-0.3V to +(IN + 0.3)V EN, ACOK.................................................................-0.3V to +6V GP...........................................................................-0.3V to +30V Continuous Power Dissipation (T = +70°C) for ...

Page 3

Overvoltage-Protection Controllers ELECTRICAL CHARACTERISTICS (continued +2.2V to +28V -40°C to +85°C, unless otherwise noted. Typical values are PARAMETER Switch On-Resistance Overcurrent Protection Threshold GP Clamp Voltage GP Pulldown Resistor GP Pullup Resistor ...

Page 4

Overvoltage-Protection Controllers with a Low +25°C, unless otherwise noted.) A SUPPLY CURRENT vs. SUPPLY VOLTAGE 250 229 208 187 166 145 124 103 VOLTAGE (V) NORMALIZED OVLO THRESHOLD ...

Page 5

Overvoltage-Protection Controllers (T = +25°C, unless otherwise noted.) A UNDERVOLTAGE FAULT RESPONSE MAX4970/71/72 toc10 5V/div V OUT 5V/div V ACOK 5V/div I OUT 1A/div 4ms/div PIN NAME Active-Low Open-Drain Adapter-Voltage Indicator Output. ACOK is driven low after ...

Page 6

Overvoltage-Protection Controllers with a Low GPPU GP R GPPD ACOK MAX4970 MAX4971 MAX4972 Detailed Description The MAX4970/MAX4971/MAX4972 overvoltage protec- tion devices feature a low R internal FET and protect ON low-voltage systems against voltage faults up ...

Page 7

Overvoltage-Protection Controllers OUT t INDBC t ACOK GP t ACOK *ACOK t ACOK **ACOK *ACOK TIMING FOR THE MAX4972. **ACOK TIMING FOR THE MAX4970/MAX4971. Figure 1. MAX4970/MAX4971/MAX4972 Timing Diagram t OFF nFET ON t RETRY nFET OFF ...

Page 8

Overvoltage-Protection Controllers with a Low R ON ACOK is an active-low, open-drain output that asserts low when V < V < V for 15ms (typ) for the UVLO IN OVLO MAX4972. ACOK asserts low when V 15ms (typ) for the ...

Page 9

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________ 9 © 2008 Maxim Integrated Products ...

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