Datasheet > MAX4843

MAX4843

更新时间： 2024-02-21 13:01:37

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美信 - MAXIM		控制器
页数	文件大小	规格书
9页	298K
描述
Overvoltage Protection Controllers with Low Standby Current

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MAX4843 数据手册

19-3649; Rev 0; 4/05

Overvoltage Protection Controllers with

Low Standby Current

General Description

Features

The MAX4843–MAX4846 overvoltage protection con-

trollers protect low-voltage systems against high-voltage

faults of up to 28V. When the input voltage exceeds the

overvoltage threshold, these devices turn off a low-cost,

external n-channel FET(s) to prevent damage to the pro-

tected components. An internal charge pump eliminates

the need for external capacitors and drives the FET gate

for a simple, robust solution.

ꢀ Overvoltage Protection Up to 28V

ꢀ Preset 7.4V, 6.35V, 5.8V, or 4.65V Overvoltage Trip

Level

ꢀ Low (10µA) Undervoltage Lockout Standby

Current

ꢀ Drives Low-Cost n MOSFET

ꢀ Internal 50ms Startup Delay

ꢀ Internal Charge Pump

The overvoltage trip level is set to 7.4V (MAX4843),

6.35V (MAX4844), 5.8V (MAX4845), or 4.65V

(MAX4846). When the input voltage drops below the

undervoltage lockout (UVLO) threshold, the devices

enter a low standby current mode (10µA). The

MAX4843/MAX4844/ MAX4845 have a UVLO threshold

of 4.15V, and the MAX4846 has a UVLO threshold of

2.5V. In addition to the single FET configuration, the

devices can be configured with back-to-back external

FETs to prevent currents from being back-driven into the

adapter.

ꢀ Overvoltage Fault FLAG Indicator

ꢀ 6-Pin (1.5mm x 1.0mm) µDFN Package

Ordering Information

PIN-

PACKAGE

UVLO

(V)

OVLO

(V)

TOP

MARK

PART*

MAX4843ELT

MAX4844ELT

MAX4845ELT

MAX4846ELT

6 µDFN

4.15

2.50

7.40

6.35

5.80

4.65

An additional feature includes a 15kV EꢀS-protected

input when bypassed with a 1µF capacitor to ground. All

devices are offered in a small (1.5mm x 1.0mm) 6-pin

µSFN package and are specified for operation over the

-40°C to +85°C temperature range.

*All devices are specified over the -40°C to +85°C temperature

range.

Applications

Cell Phones

Sigital ꢀtill Cameras

PSAs and Palmtop Sevices

MP3 Players

Pin Configuration

Typical Operating Circuit

INPUT

+1.2V TO +28V

TOP VIEW

OUTPUT

GND

N.C.

GATE

MAX4843–

MAX4846

GATE

1µF

MAX4843–

MAX4846

FLAG

GND

FLAG

µDFN

________________________________________________________________ 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...9

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与MAX4843相关器件

型号	品牌	获取价格	描述	数据表
MAX4843_V01	MAXIM	获取价格	Overvoltage Protection Controllers with Low Standby Current
MAX4843ELT	MAXIM	获取价格	Overvoltage Protection Controllers with Low Standby Current
MAX4844	MAXIM	获取价格	Overvoltage Protection Controllers with Low Standby Current
MAX4844ELT	MAXIM	获取价格	Overvoltage Protection Controllers with Low Standby Current
MAX4844ELT+T	ROCHESTER	获取价格	1-CHANNEL POWER SUPPLY SUPPORT CKT, DSO6, 1.50 X 1 MM, 0.80 MM HEIGHT, MICRO, DFN-6
MAX4845	MAXIM	获取价格	Overvoltage Protection Controllers with Low Standby Current
MAX4845CEYT+T	MAXIM	获取价格	Overvoltage Protection Controllers with Low Standby Current
MAX4845DEYT+T	MAXIM	获取价格	Overvoltage Protection Controllers with Low Standby Current
MAX4845ELT	MAXIM	获取价格	Overvoltage Protection Controllers with Low Standby Current
MAX4845ELT+	MAXIM	获取价格	Power Supply Support Circuit, Fixed, 1 Channel, BICMOS, 1.50 X 1 MM, 0.80 MM HEIGHT, MICRO

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