Datasheet > MAX4921B

MAX4921B

更新时间： 2024-11-07 02:50:27

品牌	Logo	应用领域
美信 - MAXIM		电池
页数	文件大小	规格书
19页	317K
描述
Battery Power-Up Logic with Overvoltage and Overcurrent Protection

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MAX4921B 数据手册

19-0614; Rev 0; 8/06

Battery Power-Up Logic with Overvoltage

and Overcurrent Protection

General Description

Features

The MAX4919B/MAX4920B/MAX4921B overvoltage

protection controllers protect low-voltage systems

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

ꢀ Input Overvoltage Protection Up to +28V

ꢀ Preset Overvoltage Protection Trip Level

6.38V (MAX4919B)

(min) pFET with low R

(100mΩ) switches a battery to

5.80V (MAX4920B)

4.65V (MAX4921B)

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 .

ꢀ Adapter/Car-Kit Auto-Selector

ꢀ Low-Current Undervoltage Lockout Mode

ꢀ Internal 1.8A (min) Battery Switchover FET

ꢀ Integrated Low-Battery Detect

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.

ꢀ Battery Short-Circuit Protection

ꢀ Low-Cost External nMOS Overvoltage FET

ꢀ 14-Pin TDFN Package (3mm x 3mm)

Pin Configuration

TOP VIEW

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.

14 13 12 11 10

Applications

Cell Phones

MAX4919B

MAX4920B

MAX4921B

Digital Still Cameras

PDAs and Palmtop Devices

MP3 Players

*EP

TDFN (3mm x 3mm)

*EXPOSED PADDLE

+DENOTES LEAD-FREE PACKAGE

Ordering Information/Selector Guide

PIN-

PACKAGE

PART

OVLO (V)

UVLO (V)

TOP MARK

PKG CODE

MAX4919BETD+T

MAX4920BETD+T

MAX4921BETD+T

14 TDFN-EP*

6.38

5.80

4.65

4.27

2.35

ABY

ABZ

ACA

T1433-2

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

+Denotes lead-free package.

*EP = Exposed paddle.

________________________________________________________________ Maxim Integrated Products

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.

12 3 4 5 6 7...19

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与MAX4921B相关器件

型号	品牌	获取价格	描述	数据表
MAX4921BETD+	ROCHESTER	获取价格	1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO14, 3 X 3 MM, LEAD FREE, TDFN-14
MAX4921BETD+T	MAXIM	获取价格	Battery Power-Up Logic with Overvoltage and Overcurrent Protection
MAX4923	MAXIM	获取价格	Overvoltage Protectors with External pFET
MAX4923ELT+	MAXIM	获取价格	Overvoltage Protectors with External pFET
MAX4924ELT+	MAXIM	获取价格	Overvoltage Protectors with External pFET
MAX4924ELT+T	MAXIM	获取价格	Analog Circuit, 1 Func, BICMOS, 1.50 X 1 MM, 0.80 MM HEIGHT, LEAD FREE, MO-250WAAD, MDFN-6
MAX4924ELT+T	ROCHESTER	获取价格	SPECIALTY ANALOG CIRCUIT, DSO6, 1.50 X 1 MM, 0.80 MM HEIGHT, LEAD FREE, MO-250WAAD, MDFN-6
MAX4925	ADI	获取价格	过压保护控制器，采用外部pFET
MAX4925ELT+	MAXIM	获取价格	Overvoltage Protectors with External pFET
MAX4925ELT+T	MAXIM	获取价格	Analog Circuit, 1 Func, BICMOS, 1.50 X 1 MM, 0.80 MM HEIGHT, LEAD FREE, MO-250WAAD, MDFN-6

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