MAX8903AETI MAXIM [Maxim Integrated Products], MAX8903AETI Datasheet

MAX8903AETI

Manufacturer Part Number

MAX8903AETI

Description

2A 1-Cell Li DC-DC Chargers for USB and Adapter Power Thermistor Monitor

Manufacturer

MAXIM [Maxim Integrated Products]

Datasheet

1.MAX8903AETI.pdf (30 pages)

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The MAX8903A–MAX8903E/MAX8903G/MAX8903H/

MAX8903J/MAX8903Y are integrated 1-cell Li+ charg-

ers and Smart Power Selectors™ 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 MAX8903_ 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 cur-

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

tection, while the USB input has a range of 4.1V to 6.3V

with up to 8V protection.

The MAX8903_ 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 MAX8903_ is available in a 4mm x 4mm, 28-pin

thin QFN package.

The various versions of the MAX8903_ allow for design

flexibility to choose key parameters such as system

regulation voltage, battery prequalification threshold,

and battery regulation voltage. The MAX8903B/

MAX8903E/MAX8903G also includes power-enable on

battery detection. See the Selector Guide section for

complete details.

19-4410; Rev 4; 5/11

PDAs, Palmtops, and

Wireless Handhelds

Personal Navigation

Devices

Smart Cell Phones

Selector Guide appears at end of data sheet.

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.

________________________________________________________________ Maxim Integrated Products

General Description

2A 1-Cell Li+ DC-DC Chargers for USB

Portable Multimedia

Players

Mobile Internet Devices

Ultra Mobile PCs

Applications

o Efficient DC-DC Converter Eliminates Heat

o 4MHz Switching for Tiny External Components

o Instant On—Works with No/Low Battery

o Dual Current-Limiting Inputs—AC Adapter or USB

o Thermistor Monitor

o Integrated Current-Sense Resistor

o No External MOSFETs or Diodes

o 4.1V to 16V Input Operating Voltage Range

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

* EP = Exposed pad.

** Future product—contact factory for availability.

T = Tape and reel.

Pin Configuration appears at end of data sheet.

ADAPTER

MAX8903AETI+T

MAX8903BETI+T

MAX8903CETI+T

MAX8903DETI+T

MAX8903EETI+T

MAX8903GETI+T

MAX8903HETI+T

MAX8903JETI+T**

MAX8903YETI+T

OR USB

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

MAX8903_

LOAD

CURRENT

PIN-PACKAGE

28 Thin QFN-EP*

CHARGE

SYS LOAD

SWITCH

AND

Features

GND

SYS

BAT

BATTERY

SYSTEM

LOAD

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