MAX4842AEXT

更新时间： 2024-01-23 03:01:42

品牌	Logo	应用领域
美信 - MAXIM		控制器
页数	文件大小	规格书
11页	504K
描述
Overvoltage-Protection Controllers with Status FLAG

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MAX4842AEXT 数据手册

19-3979; Rev 0; 2/06

Overvoltage-Protection Controllers with

Status FLAG

General Description

Features

The MAX4838A/MAX4840A/MAX4842A 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 MAX4838A/MAX4840A/

MAX4842A turn off the low-cost external n-channel

FET(s) to prevent damage to the protected 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, 5.8V, or 4.7V Overvoltage Trip Level

♦ Drives Low-Cost nMOS FET

♦ Internal 50ms Startup Delay

♦ Internal Charge Pump

♦ Undervoltage Lockout

♦ ±±5kV ESD-Protected Input

♦ Voltage Fault FLAG Indicator

♦ 6-Pin SC70 and µDFN Packages

♦ Lead Free

The MAX4838A has a 7.4V overvoltage threshold, and

the MAX4840A has a 5.8V overvoltage threshold. The

MAX4842A has a 4.7V overvoltage threshold. The

MAX4838A/MAX4840A have an undervoltage-lockout

(UVLO) threshold of 3.25V, while the MAX4842A has a

UVLO of 2.5V. In addition to the single FET configura-

tion, the devices can be configured with back-to-back

external FETs to prevent currents from being back-dri-

ven into the adapter.

Ordering Information

PIN-

TOP

PKG

PART

PACKAGE

MARK

CODE

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

MAX4838A/MAX4840A/MAX4842A have an open-drain

FLAG output. The FLAG output asserts immediately to

an overvoltage fault.

MAX4838AEXT+T

MAX4838AELT+

MAX4840AEXT+T

MAX4840AELT+

MAX4842AEXT+T

MAX4842AELT+*

6 ꢁC70

6 µSFN

6 ꢁC70

6 µSFN

6 ꢁC70

6 µSFN

ACY

X6ꢁ-±

L6±±-±

X6ꢁ-±

L6±±-±

X6ꢁ-±

L6±±-±

ACZ

ASA

Additional features include a ±±5kV (ꢀHM) EꢁS-pro-

tected input (when bypassed with a ±µF capacitor) and

a shutdown pin (EN) to turn off the device.

Note: All devices specified for the -40°C to +85°C extended

All devices are offered in a small 6-pin ꢁC70 and 6-pin

±.5mm x ±.0mm µSFN packages and are specified

over the -40°C to +85°C extended temperature range.

temperature range.

*Future product—contact factory for availability.

+Denotes lead-free package.

Applications

Cell Phones

Typical Operating Circuit

Sigital ꢁtill Cameras

PSAs and Palmtop Sevices

MP3 Players

INPUT

+1.2V TO +28V

OUTPUT

NMOS

GATE

1µF

Selector Guide

MAX4838A

MAX4840A

MAX4842A

UVLO

THRESHOLD

(V)

TRIP

LEVEL

(V)

FLAG

PART

INPUT OUTPUT

FLAG

NOTE: EN AND PULLUP

RESISTOR

GND

MAX4838A

MAX4840A

MAX4842A

3.25

2.50

7.4

5.8

4.7

Yes Open-Srain

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...11

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与MAX4842AEXT相关器件

型号	品牌	获取价格	描述	数据表
MAX4842AEXT+	MAXIM	获取价格	Power Management Circuit, BICMOS, PDSO6,
MAX4842AEXT+T	MAXIM	获取价格	Power Supply Support Circuit, Fixed, 1 Channel, BICMOS, PDSO6, LEAD FREE, SC-70, 6 PIN
MAX4842EXT+T	ROCHESTER	获取价格	1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO6, SC-70, 6 PIN
MAX4842EXT-T	MAXIM	获取价格	Power Supply Support Circuit, Fixed, 1 Channel, BICMOS, PDSO6, SC-70, 6 PIN
MAX4843	MAXIM	获取价格	Overvoltage Protection Controllers with Low Standby Current
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

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