MAX4840AELT

更新时间： 2024-01-20 15:29:41

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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MAX4840AELT 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MAX4840AELT相关器件

型号	品牌	获取价格	描述	数据表
MAX4840AELT+	ROCHESTER	获取价格	1-CHANNEL POWER SUPPLY SUPPORT CKT, DSO6, 1.50 X 1 MM, 0.80 MM HEIGHT, LEAD FREE, MO-252WA
MAX4840AELT+T	MAXIM	获取价格	Power Supply Support Circuit, Fixed, 1 Channel, BICMOS, 1.50 X 1 MM, 0.80 MM HEIGHT, LEAD
MAX4840AELT+T	ROCHESTER	获取价格	1-CHANNEL POWER SUPPLY SUPPORT CKT, DSO6, 1.50 X 1 MM, 0.80 MM HEIGHT, LEAD FREE, MO-252WA
MAX4840AEXT	MAXIM	获取价格	Overvoltage-Protection Controllers with Status FLAG
MAX4840AEXT+	MAXIM	获取价格	Power Supply Support Circuit, Fixed, 1 Channel, BICMOS, PDSO6, LEAD FREE, SC-70, 6 PIN
MAX4840AEXT+T	MAXIM	获取价格	Power Supply Support Circuit, Fixed, 1 Channel, BICMOS, PDSO6, LEAD FREE, SC-70, 6 PIN
MAX4840EXT+	MAXIM	获取价格	Power Supply Support Circuit, Fixed, 1 Channel, BICMOS, PDSO6, EIAJ, SC-70, 6PIN
MAX4840EXT+T	MAXIM	获取价格	Power Supply Support Circuit, Fixed, 1 Channel, BICMOS, PDSO6, SC-70, 6 PIN
MAX4840EXT-T	MAXIM	获取价格	Overvoltage Protection Controllers with Status FLAG
MAX4841	MAXIM	获取价格	Overvoltage Protection Controllers with Status FLAG

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