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FEATURES

DESCRIPTION

APPLICATIONS

POWER FLOW DIAGRAM

(1)

IN

BAT

OUT

bq24070

PACK+

PACK−

System

VDC

GND

AC Adapter

+

Q1

Q2

UDG

−04082

40 mΩ

(2)

bq24070

SLUS694A – MARCH 2006 – REVISED MARCH 2006

SINGLE-CHIP CHARGE AND SYSTEM POWER-PATH MANAGEMENT IC

•

Small 3,5 mm × 4,5 mm QFN Package

The bq24070 device is a highly integrated Li-ion

linear charger and system power-path management

•

Designed for Single-Cell Li-Ion- or

device

targeted

at

space-limited

portable

Li-Polymer-Based Portable Applications

applications. The bq24070 offers DC supply (AC

•

Integrated Dynamic Power-Path Management

adapter) power-path management with autonomous

(DPPM) Feature Allowing the AC Adapter to

power-source selection, power FETs and current

Simultaneously Power the System and

sensors,

high-accuracy

current

and

voltage

Charge the Battery

regulation, charge status, and charge termination, in

a single monolithic device.

•

Power Supplement Mode Allows Battery to

Supplement the AC Input Current

The bq24070 powers the system while independently

•

Autonomous Power Source Selection (AC

charging the battery. This feature reduces the charge

Adapter or BAT)

and discharge cycles on the battery, allows for

proper charge termination and allows the system to

•

Supports Up to 2-A Total Current

run with an absent or defective battery pack. This

•

Thermal Regulation for Charge Control

feature also allows for the system to instantaneously

•

Charge Status Outputs for LED or System

turn on from an external power source in the case of

a deeply discharged battery pack. The IC design is

Interface Indicates Charge and Fault

focused on supplying continuous power to the

Conditions

system when available from the AC adapter or

•

Reverse Current, Short-Circuit, and Thermal

battery sources.

Protection

•

Power Good Status Outputs

•

Smart Phones and PDA

•

MP3 Players

•

Digital Cameras and Handheld Devices

•

Internet Appliances

(1)

See Figure 2 and functional block diagram for more detailed feature information.

(2)

P-FET back gate body diodes are disconnected to prevent body diode conduction.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas

Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

PRODUCTION DATA information is current as of publication date.

Copyright © 2006, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.