MAX4970, MAX4971, MAX4972 Overvoltage-Protection Controllers with a Low RON Internal FET

Description

The MAX4970/MAX4971/MAX4972 family of overvoltage protection devices features a low 40mΩ (typ) R_ON 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-polarity 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 protection. During a short-circuit occurrence, the device operates 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 (active-low EN) that controls the operation of the internal nFET as well as the optional external pFET. The use of active-low 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 package and operate over the -40°C to +85°C extended temperature range.

Key Features

Applications/Uses

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

	Cell Phones
	Digital Still Cameras
	MP3 Players
	PDAs and Palmtop Devices

Key Specifications: Overvoltage Protection Controllers

Part Number

Channels

V_IN
(V)

Over Voltage Trip Level
(V)

Under Voltage Lockout
(V)

V_GATE
(V)

t_GATE (On)
(ms)

t_GATE (Off)
(µs)

Features

Package/Pins

Price

min

max

See Notes

MAX4970

2.2

5.9

2.45

Auto Retry

Internal Charge Pump

Internal Current-Limit Switch

Internal Disconnect Switch

Soft Start

UCSP/12

WLP/12

$1.44 @1k

MAX4972

4.65

UCSP/12

WLP/12

$1.44 @1k

See All Overvoltage Protection Controllers (47)

Diagram

Typical Operating Circuit

Design Guides

Interface (PDF)

Reliability Reports

Reliability Report: MAX4971.pdf MAX4972.pdf

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Software/Models

none

Ordering Information

Notes:

Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
Part number suffixes: T or T&R = tape and reel;+ = RoHS/lead-free;# = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions.
* Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.

Devices: 1-6 of 6

MAX4970 Free
Sample Buy Status

Package: TYPE PINS FOOTPRINT

DRAWING CODE/VAR *

Temp RoHS/Lead-Free?
Materials Analysis

MAX4970EBC+T

Active UCSP;12 pin;3 mm²
Outline Drawing: 21-0104 (PDF)
Land Pattern: Not Available
Use pkgcode/variation: B12+3*
-40°C to +85°C RoHS/Lead-Free: Lead Free
Materials Analysis

MAX4970EWC+T

Active WLP;12 pin;3.35 mm²
Outline Drawing: 21-0009 (PDF)
Land Pattern: Not Available
Use pkgcode/variation: W121A2+1*
-40°C to +85°C RoHS/Lead-Free: Lead Free
Materials Analysis

MAX4971 Free
Sample Buy Status

Package: TYPE PINS FOOTPRINT

DRAWING CODE/VAR *

Temp RoHS/Lead-Free?
Materials Analysis

MAX4971EBC+T

Active UCSP;12 pin;3 mm²
Outline Drawing: 21-0104 (PDF)
Land Pattern: Not Available
Use pkgcode/variation: B12+3*
-40°C to +85°C RoHS/Lead-Free: Lead Free
Materials Analysis

MAX4971EWC+T

Active WLP;12 pin;3.35 mm²
Outline Drawing: 21-0009 (PDF)
Land Pattern: Not Available
Use pkgcode/variation: W121A2+1*
-40°C to +85°C RoHS/Lead-Free: Lead Free
Materials Analysis

MAX4972 Free
Sample Buy Status

Package: TYPE PINS FOOTPRINT

DRAWING CODE/VAR *

Temp RoHS/Lead-Free?
Materials Analysis

MAX4972EBC+T

Active UCSP;12 pin;3 mm²
Outline Drawing: 21-0104 (PDF)
Land Pattern: Not Available
Use pkgcode/variation: B12+3*
-40°C to +85°C RoHS/Lead-Free: Lead Free
Materials Analysis

MAX4972EWC+T

Active WLP;12 pin;3.35 mm²
Outline Drawing: 21-0009 (PDF)
Land Pattern: Not Available
Use pkgcode/variation: W121A2+1*
-40°C to +85°C RoHS/Lead-Free: Lead Free
Materials Analysis

More Information

Topmark Coding: MAX4970 MAX4971 MAX4972

New Product Press Release 2008-08-25

Related Products

MAX4843, MAX4844, MAX4845, MAX4846 Overvoltage Protection Controllers with Low Standby Current

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Document Ref.: 19-4139; Rev 1; 2008-08-26
This page last modified: 2008-11-05