Rainbow-electronics MAX8903A Uživatelský manuál stáhnout pdf

General Description

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.

Applications

PDAs, Palmtops, and Wireless Handhelds

Personal Navigation Devices

Smart Cell Phones

Portable Multimedia Players

Mobile Internet Devices

Ultra Mobile PCs

Features

♦ Efficient DC-DC Converter Eliminates Heat

♦ 4MHz Switching for Tiny External Components

♦ Instant On—Works with No Battery or Low

Battery

♦ Dual Current-Limiting Input Circuits—AC Adapter

or USB

Automatic Adapter/USB/Battery Switchover to

Support Load Transients

50mΩ System-to-Battery Switch

Supports USB Spec

♦ Thermistor Monitor

♦ Integrated Current-Sense Resistor

♦ No External MOSFETS or Diodes

♦ 4.1V to 16V Input Operating Voltage Range

MAX8903A

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

and Adapter Power

________________________________________________________________

Maxim Integrated Products

19-4410; Rev 0; 12/08

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.

EVALUATION KIT

AVAILABLE

Pin Configuration appears at end of data sheet.

CHARGE AND

SYS LOAD

SWITCH

SYS

BAT

ADAPTER

OR USB

SYSTEM

LOAD

BATTERY

GND

USB

CHARGE

CURRENT

LOAD

CURRENT

PWM

STEP-DOWN

MAX8903A

Typical Operating Circuit

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

Smart Power Selector is a trademark of Maxim Integrated

Products, Inc.

Ordering Information

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

EP = Exposed pad.

PART TEMP RANGE PIN-PACKAGE

MAX8903AETI+ -40°C to +85°C

28 Thin QFN-EP**

1 2 3 4 5 6 ... 19 20

MAX8903A 1

Shrnutí obsahu

Strany 1 - MAX8903A

General DescriptionThe MAX8903A is an integrated 1-cell Li+ charger andSmart Power Selector™ with dual (AC adapter andUSB) power inputs. The switch mo

Strany 2

MAX8903A2A 1-Cell Li+ DC-DC Charger for USB*and Adapter Power10 ______________________________________________________________________________________

Strany 3

MAX8903A2A 1-Cell Li+ DC-DC Charger for USB*and Adapter Power______________________________________________________________________________________ 11

Strany 4

MAX8903A2A 1-Cell Li+ DC-DC Charger for USB*and Adapter Power12 ______________________________________________________________________________________

Strany 5

MAX8903A2A 1-Cell Li+ DC-DC Charger for USB*and Adapter Power______________________________________________________________________________________ 13

Strany 6

MAX8903A2A 1-Cell Li+ DC-DC Charger for USB*and Adapter Power14 ______________________________________________________________________________________

Strany 7

MAX8903A2A 1-Cell Li+ DC-DC Charger for USB*and Adapter Power______________________________________________________________________________________ 15

Strany 8

MAX8903A2A 1-Cell Li+ DC-DC Charger for USB*and Adapter Power16 ______________________________________________________________________________________

Strany 9

MAX8903A2A 1-Cell Li+ DC-DC Charger for USB*and Adapter Power______________________________________________________________________________________ 17

Strany 10

MAX8903A2A 1-Cell Li+ DC-DC Charger for USB*and Adapter Power18 ______________________________________________________________________________________

Strany 11

MAX8903A2A 1-Cell Li+ DC-DC Charger for USB*and Adapter Power______________________________________________________________________________________ 19

Strany 12

MAX8903A2A 1-Cell Li+ DC-DC Charger for USB*and Adapter Power2 _______________________________________________________________________________________

Strany 13

MAX8903A2A 1-Cell Li+ DC-DC Charger for USB*and Adapter PowerMaxim cannot assume responsibility for use of any circuitry other than circuitry entirely

Strany 14

MAX8903A2A 1-Cell Li+ DC-DC Charger for USB*and Adapter Power_______________________________________________________________________________________ 3

Strany 15

MAX8903A2A 1-Cell Li+ DC-DC Charger for USB*and Adapter Power4 _______________________________________________________________________________________

Strany 16

MAX8903A2A 1-Cell Li+ DC-DC Charger for USB*and Adapter Power_______________________________________________________________________________________ 5

Strany 17

MAX8903A2A 1-Cell Li+ DC-DC Charger for USB*and Adapter Power6 _______________________________________________________________________________________

Strany 18

MAX8903A2A 1-Cell Li+ DC-DC Charger for USB*and Adapter Power_______________________________________________________________________________________ 7

Strany 19

MAX8903A2A 1-Cell Li+ DC-DC Charger for USB*and Adapter Power8 _______________________________________________________________________________________

Strany 20

MAX8903A2A 1-Cell Li+ DC-DC Charger for USB*and Adapter Power_______________________________________________________________________________________ 9

Komentáře k této Příručce

Žádné komentáře

Rainbow-electronics MAX8903A Uživatelský manuál

Procházejte online nebo si stáhněte Uživatelský manuál pro Senzory Rainbow-electronics MAX8903A. Rainbow Electronics MAX8903A User Manual Uživatelská příručka

Shrnutí obsahu

Komentáře k této Příručce

Související produkty a manuály pro Senzory Rainbow-electronics MAX8903A