Rainbow-electronics MAX4880 Manual de usuario descargar pdf (Pagina 1)

General Description

The MAX4880 is an overvoltage-protection controller

with an internal current-limited switch that can be con-

figured as a low-cost battery charger. When the input

voltage exceeds the overvoltage trip level (5.7V), or

drops below the undervoltage-lockout level (4.2V), the

MAX4880 turns off the external n-channel MOSFET and

asserts an undervoltage/overvoltage flag indicator

(FLAGV) low to notify the processor.

The MAX4880 internal current-limited switch limits the

charge current flowing to the battery to 525mA. The

switch opens when the battery voltage reaches its full-

charged state (4.2V), and a flag (BAT_OK) asserts to

notify the processor. The MAX4880 includes a switch-

control input (CB) to turn off the internal current-limited

switch, regardless of the battery voltage.

The MAX4880 also features a built-in startup delay that

allows the adapter voltage to settle down before turning

on the MOSFET. Other features include 15kV ESD pro-

tection for the input and a shutdown function (EN) to

turn off the external n-channel MOSFET.

The MAX4880 is available in a space-saving 10-pin

TDFN package and is specified for operation over the

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

Applications

Cell Phones

Digital Still Cameras

PDAs and Palmtop Devices

MP3 Players

Features

♦ Overvoltage Protection Up to 28V

♦ Preset 5.6V Overvoltage Trip Level

♦ Internal 525mA Current-Limited Switch

♦ ±1.2% Accurate Battery Disconnect (4.2V)

♦ Drives Low-Cost n-Channel MOSFET

♦ Internal 50ms Startup Delay

♦ Overvoltage/Undervoltage-Fault FLAGV Indicator

♦ Battery-Voltage-Trip BAT_OK Indicator

♦ Undervoltage Lockout

♦ Thermal Shutdown Protection

♦ Tiny 10-Pin TDFN Package

MAX4880

Overvoltage-Protection Controller with

Internal Disconnect Switch

________________________________________________________________ Maxim Integrated Products 1

FLAGV

GND

BTB

BTB_SNS

MAX4880

BAT_OK

GATE

BTA

3mm x 3mm TDFN

TOP VIEW

134

10 8 7

Pin Configuration

Ordering Information

AC-DC

ADAPTER

5.25V

GATEIN

FLAGV

BAT_OK

BTB_SNS

Li+

BTB

BTA

GND

DC-DC

CONVERTER

MAX4880

Typical Operating Circuit

19-3776; Rev 0; 7/05

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.

PART

TEMP RANGE

PIN-

PACKAGE

TOP

MARK

MAX4880ETB

-40°C to +85°C 10 TDFN-EP*

APJ

* EP = Exposed Pad

1 2 3 4 5 6 7 8 9 10

Indice de contenidos

Pagina 1 - Internal Disconnect Switch

General DescriptionThe MAX4880 is an overvoltage-protection controllerwith an internal current-limited switch that can be con-figured as a low-cost ba

Pagina 2

MAX4880Overvoltage-Protection Controller withInternal Disconnect SwitchMaxim cannot assume responsibility for use of any circuitry other than circuitr

Pagina 3

MAX4880Overvoltage-Protection Controller withInternal Disconnect Switch2 _____________________________________________________________________________

Pagina 4

MAX4880Overvoltage-Protection Controller withInternal Disconnect Switch_______________________________________________________________________________

Pagina 5

MAX4880Overvoltage-Protection Controller withInternal Disconnect Switch4 _____________________________________________________________________________

Pagina 6

MAX4880Overvoltage-Protection Controller withInternal Disconnect Switch_______________________________________________________________________________

Pagina 7

MAX4880Overvoltage-Protection Controller withInternal Disconnect Switch6 _____________________________________________________________________________

Pagina 8

Detailed DescriptionThe MAX4880 provides up to 28V overvoltage protectionfor low-voltage systems. When the input voltage at INexceeds the overvoltage

Pagina 9

MAX4880and turns back on when the battery falls below the BTBtrip level minus BTB hysteresis. Drive CB low to turn offthe internal switch, regardless

Pagina 10 - Package Information

tank circuit and provide protection if necessary to pre-vent exceeding the 30V absolute maximum rating on IN.The MAX4880 provides protection against v

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Rainbow-electronics MAX4880 Manual de usuario Pagina 1

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