MAX4919B データシートの表示（PDF） - Maxim Integrated

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MAX4919B

Battery Power-Up Logic with Overvoltage and Overcurrent Protection

Maxim Integrated 

19-0614; Rev 0; 8/06

Battery Power-Up Logic with Overvoltage

and Overcurrent Protection

General Description

The MAX4919B/MAX4920B/MAX4921B overvoltage

protection controllers protect low-voltage systems

against high-voltage faults up to +28V. An internal 1.8A

(min) pFET with low RON (100mΩ) switches a battery to

the load and also protects the battery against short-cir-

cuit faults. When a short circuit occurs, the current

through the internal pFET is limited for a blanking peri-

od. If the short condition is present after the blanking

period, the switch is latched off and remains off until

one of the input signals (IN, HP_PWR, PWR_ON) is

cycled. The pFET is turned on by a logic-high voltage

at PWR_HOLD, HP_PWR, PWR_ON, or IN .

The overvoltage thresholds (OVLO) are preset to

+6.38V (MAX4919B), +5.80V (MAX4920B), and +4.65V

(MAX4921B). When the input voltage drops below the

undervoltage lockout (UVLO) threshold, the devices enter

a low-current standby mode. In shutdown mode, the

current is reduced to 0.4µA. The MAX4919B/MAX4920B

have a +4.27V UVLO threshold, and the MAX4921B has

a +2.35V UVLO threshold.

The MAX4919B/MAX4920B/MAX4921B are offered in a

small 14-pin TDFN package (3mm x 3mm) with an

exposed paddle and are specified over the extended

-40°C to +85°C temperature range.

Applications

Cell Phones

Digital Still Cameras

PDAs and Palmtop Devices

MP3 Players

Features

o Input Overvoltage Protection Up to +28V

o Preset Overvoltage Protection Trip Level

6.38V (MAX4919B)

5.80V (MAX4920B)

4.65V (MAX4921B)

o Adapter/Car-Kit Auto-Selector

o Low-Current Undervoltage Lockout Mode

o Internal 1.8A (min) Battery Switchover FET

o Integrated Low-Battery Detect

o Battery Short-Circuit Protection

o Low-Cost External nMOS Overvoltage FET

o 14-Pin TDFN Package (3mm x 3mm)

Pin Configuration

TOP VIEW

14 13 12 11 10 9 8

MAX4919B

MAX4920B

MAX4921B

+ *EP

1234567

TDFN (3mm x 3mm)

*EXPOSED PADDLE

+DENOTES LEAD-FREE PACKAGE

Ordering Information/Selector Guide

PART

PIN-

PACKAGE

OVLO (V)

UVLO (V)

MAX4919BETD+T

14 TDFN-EP*

6.38

4.27

MAX4920BETD+T

14 TDFN-EP*

5.80

4.27

MAX4921BETD+T

14 TDFN-EP*

4.65

2.35

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

+Denotes lead-free package.

*EP = Exposed paddle.

TOP MARK

ABY

ABZ

ACA

PKG CODE

T1433-2

T1433-2

T1433-2

________________________________________________________________ Maxim Integrated Products 1

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.

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