MAX4840EXT-T

更新时间： 2024-11-12 22:31:11

品牌	Logo	应用领域
美信 - MAXIM		控制器
页数	文件大小	规格书
10页	228K
描述
Overvoltage Protection Controllers with Status FLAG

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数据手册

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MAX4840EXT-T 数据手册

19-3044; Rev 0; 10/03

Overvoltage Protection Controllers with

Status FLAG

General Description

Features

The MAX4838–MAX4841 are overvoltage protection ICs

that protect low-voltage systems against voltages of up

to 28V. If the input voltage exceeds the overvoltage trip

level, the MAX4838–MAX4841 turn off the low-cost

external N-channel FET(s) to prevent damage to the

protected components. An internal charge pump elimi-

nates the need for external capacitors and drives the

FET gate for a simple, robust solution.

ꢀ Overvoltage Protection Up to 28V

ꢀ Preset 7.4V or 5.8V Overvoltage Trip Level

ꢀ Drive Low-Cost NMOS FET

ꢀ Internal 50ms Startup Delay

ꢀ Internal Charge Pump

ꢀ Undervoltage Lockout

The MAX4838/MAX4839 have a 7.4V overvoltage

threshold, and the MAX4840/MAX4841 have a 5.8V

overvoltage threshold. All devices have an undervolt-

age lockout threshold of 3.25V. 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.

ꢀ 15kV ESD-Protected Input

ꢀ Voltage Fault FLAG Indicator

ꢀ 6-Pin SC70 Package

On power-up, the device waits for 50ms before driving

GATE high. FLAG is held low for an additional 50ms

after GATE goes high before deasserting. The

MAX4838/MAX4840 have an open-drain FLAG output,

and the MAX4839/MAX4841 have a push-pull FLAG

output. The FLAG output asserts immediately to an

overvoltage fault.

Ordering Information

PIN-

PACKAGE

TOP

MARK

PART

TEMP RANGE

MAX4838EXT-T

MAX4839EXT-T

MAX4840EXT-T

MAX4841EXT-T

-40°C to +85°C

6 SC70-6

ABW

ABY

ABX

ABZ

Additional features include a 15kV ESD-protected input

(when bypassed with a 1µF capacitor) and a shutdown

pin (EN) to turn off the device (MAX4838/MAX4840).

All devices are offered in a small 6-pin SC70 package

and are specified for operation from -40°C to +85°C.

Applications

Typical Operating Circuit

Cell Phones

Digital Still Cameras

PDAs and Palmtop Devices

MP3 Players

INPUT

+1.2V TO +28V

OUTPUT

NMOS

Selector Guide

GATE

1µF

UVLO

MAX4838–

MAX4841

TRIP

LEVEL

(V)

FLAG

THRESHOLD

(V)

PART

INPUT OUTPUT

FLAG

NOTE: EN AND PULLUP

RESISTOR ON MAX4838/

MAX4840 ONLY.

MAX4838EXT-T

MAX4839EXT-T

MAX4840EXT-T

MAX4841EXT-T

3.25

7.4

5.8

Yes Open-Drain

GND

Yes Open-Drain

No Push-Pull

Push-Pull

Pin Configuration appears at end of data sheet.

________________________________________________________________ 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...10

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与MAX4840EXT-T相关器件

型号	品牌	获取价格	描述	数据表
MAX4841	MAXIM	获取价格	Overvoltage Protection Controllers with Status FLAG
MAX4841	ADI	获取价格	过压保护控制器，带有状态标示FLAG
MAX4841EXT+T	MAXIM	获取价格	Power Supply Support Circuit, Fixed, 1 Channel, BICMOS, PDSO6, SC-70, 6 PIN
MAX4841EXT-T	MAXIM	获取价格	Overvoltage Protection Controllers with Status FLAG
MAX4841EXT-T	ROCHESTER	获取价格	1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO6, SC-70, 6 PIN
MAX4842	MAXIM	获取价格	锂电池保护IC
MAX4842A	MAXIM	获取价格	Overvoltage-Protection Controllers with Status FLAG
MAX4842AELT	MAXIM	获取价格	Overvoltage-Protection Controllers with Status FLAG
MAX4842AELT+	MAXIM	获取价格	Power Supply Support Circuit, Fixed, 1 Channel, BICMOS, 1.50 X 1 MM, 0.80 MM HEIGHT, LEAD
MAX4842AELT+T	MAXIM	获取价格	Power Supply Support Circuit, Fixed, 1 Channel, BICMOS, 1.50 X 1 MM, 0.80 MM HEIGHT, LEAD

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