Rainbow-electronics MAX1555 Manual de usuario descargar pdf

General Description

The MAX1551/MAX1555 charge a single-cell lithium-ion

(Li+) battery from both USB* and AC adapter sources.

They operate with no external FETs or diodes, and

accept operating input voltages up to 7V.

On-chip thermal limiting simplifies PC board layout and

allows optimum charging rate without the thermal limits

imposed by worst-case battery and input voltage. When

the MAX1551/MAX1555 thermal limits are reached, the

chargers do not shut down, but progressively reduce

charging current.

The MAX1551 includes a POK output to indicate when

input power is present. If either charging source is

active, POK goes low. The MAX1555 instead features a

CHG output to indicate charging status.

With USB connected, but without DC power, charge cur-

rent is set to 100mA (max). This allows charging from

both powered and unpowered USB hubs with no port

communication required. When DC power is connected,

charging current is set at 280mA (typ). No input-blocking

diodes are required to prevent battery drain.

The MAX1551/MAX1555 are available in 5-pin thin SOT23

packages and operate over a -40°C to +85°C range.

Applications

PDAs

Wireless Appliances

Cell Phones

Digital Cameras

Features

♦ Charge from USB or AC Adapter

♦ Automatic Switchover when AC Adapter is

Plugged In

♦ On-Chip Thermal Limiting Simplifies Board

Design

♦ Charge Status Indicator

♦ 5-Pin Thin SOT23 Package

♦ Protected by U.S. Patent #6,507,172

MAX1551/MAX1555

SOT23 Dual-Input USB/AC Adapter 1-Cell Li+

Battery Chargers

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

19-2902; Rev 0; 7/03

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

MAX1551EZK-T -40°C to +85°C 5 Thin SOT23-5

MAX1555EZK-T -40°C to +85°C 5 Thin SOT23-5

GND

15BATUSB

MAX1551

(MAX1555)

THIN SOT23

TOP VIEW

POK

(CHG)

Pin Configuration

MAX1551

(MAX1555)

USB

BAT

AC ADAPTER

3.7V TO 7V

USB

3.7V TO 6V

TO SYSTEM

LOAD

Li+

GND

TO LOGIC RAIL

CHARGE

CONTROL

POK

(CHG)

LOGIC

CONTROL

Typical Operating Circuit

*Protected by U.S. Patent #6,507,172.

Selector Guide

PART TOP MARK FEATURES

MAX1551EZK ADRT POK Output

MAX1555EZK ADRU CHG Output

1 2 3 4 5 6 7 8

MAX1551/MAX1555 1
Battery Chargers 1

Indice de contenidos

Pagina 1 - Battery Chargers

General DescriptionThe MAX1551/MAX1555 charge a single-cell lithium-ion(Li+) battery from both USB* and AC adapter sources.They operate with no extern

Pagina 2

MAX1551/MAX1555SOT23 Dual-Input USB/AC Adapter 1-Cell Li+Battery Chargers2 ___________________________________________________________________________

Pagina 3

MAX1551/MAX1555SOT23 Dual-Input USB/AC Adapter 1-Cell Li+Battery Chargers_____________________________________________________________________________

Pagina 4

MAX1551/MAX1555SOT23 Dual-Input USB/AC Adapter 1-Cell Li+Battery Chargers4 ___________________________________________________________________________

Pagina 5

Detailed DescriptionThe MAX1551/MAX1555 charge a single-cell Li+ bat-tery from both USB and AC adapter sources, enablingportable users to forgo carryi

Pagina 6

MAX1551/MAX1555Precharge CurrentThe MAX1551/MAX1555 feature a precharge current toprotect deeply discharged cells. If VBAT is less than 3V,the device

Pagina 7

MAX1551/MAX1555SOT23 Dual-Input USB/AC Adapter 1-Cell Li+Battery Chargers_____________________________________________________________________________

Pagina 8

MAX1551/MAX1555SOT23 Dual-Input USB/AC Adapter 1-Cell Li+Battery ChargersMaxim cannot assume responsibility for use of any circuitry other than circui

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Rainbow-electronics MAX1555 Manual de usuario

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