MAX8903A Maxim Integrated Products, MAX8903A Datasheet

MAX8903A

Manufacturer Part Number

MAX8903A

Description

2A 1-Cell Li+ DC-DC Charger for USB* and Adapter Power

Manufacturer

Maxim Integrated Products

Datasheet

1.MAX8903A.pdf (20 pages)

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The MAX8903A is an integrated 1-cell Li+ charger and

Smart Power Selector™ with dual (AC adapter and

USB) power inputs. The switch mode charger uses a

high switching frequency to eliminate heat and allow

tiny external components. It can operate with either

separate inputs for USB and AC adapter power, or from

a single input that accepts both. All power switches for

charging and switching the load between battery and

external power are included on-chip. No external

MOSFETs, blocking diodes, or current-sense resistors

are required.

The MAX8903A features optimized smart power control

to make the best use of limited USB or adapter power.

Battery charge current and SYS output current limit are

independently set. Power not used by the system

charges the battery. Charge current and SYS output

current limit can be set up to 2A while USB input cur-

rent can be set to 100mA or 500mA. Automatic input

selection switches the system from battery to external

power. The DC input operates from 4.15V to 16V with

up to 20V protection, while the USB input has a range

of 4.1V to 6.3V with up to 8V protection.

The MAX8903A internally blocks current from the bat-

tery and system back to the DC and USB inputs when

no input supply is present. Other features include pre-

qual charging and timer, fast charge timer, overvoltage

protection, charge status and fault outputs, power-OK

monitors, and a battery thermistor monitor. In addition,

on-chip thermal limiting reduces battery charge rate

and AC adapter current to prevent charger overheat-

ing. The MAX8903A is available in a 4mm x 4mm, 28-pin

thin QFN package.

19-4410; Rev 0; 12/08

*Protected by US Patent #6,507,172.

Smart Power Selector is a trademark of Maxim Integrated

Products, Inc.

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

PDAs, Palmtops, and Wireless Handhelds

Personal Navigation Devices

Smart Cell Phones

Portable Multimedia Players

Mobile Internet Devices

Ultra Mobile PCs

________________________________________________________________ Maxim Integrated Products

General Description

2A 1-Cell Li+ DC-DC Charger for USB*

Applications

♦ Efficient DC-DC Converter Eliminates Heat

♦ 4MHz Switching for Tiny External Components

♦ Instant On—Works with No Battery or Low

♦ Dual Current-Limiting Input Circuits—AC Adapter

♦ Thermistor Monitor

♦ Integrated Current-Sense Resistor

♦ No External MOSFETS or Diodes

♦ 4.1V to 16V Input Operating Voltage Range

+ Denotes a lead(Pb)-free/RoHS-compliant package.

** EP = Exposed pad.

Pin Configuration appears at end of data sheet.

ADAPTER

MAX8903AETI+

OR USB

USB

Battery

or USB

Automatic Adapter/USB/Battery Switchover to

50mΩ System-to-Battery Switch

Supports USB Spec

Support Load Transients

PART

USB

and Adapter Power

STEP-DOWN

PWM

Typical Operating Circuit

-40°C to +85°C

TEMP RANGE

Ordering Information

CHARGE

CURRENT

MAX8903A

CHARGE AND

SYS LOAD

SWITCH

28 Thin QFN-EP**

LOAD

CURRENT

PIN-PACKAGE

Features

GND

SYS

BAT

BATTERY

SYSTEM

LOAD

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