BQ24070 Datasheet, PDF (1/26 Pages) Texas Instruments – SINGLE-CHIP CHARGE AND SYSTEM POWER-PATH MANAGEMENT IC

bq24070
www.ti.com
SLUS694A – MARCH 2006 – REVISED MARCH 2006
SINGLE-CHIP CHARGE AND SYSTEM POWER-PATH MANAGEMENT IC
FEATURES
• Small 3,5 mm × 4,5 mm QFN Package
• Designed for Single-Cell Li-Ion- or
Li-Polymer-Based Portable Applications
• Integrated Dynamic Power-Path Management
(DPPM) Feature Allowing the AC Adapter to
Simultaneously Power the System and
Charge the Battery
• Power Supplement Mode Allows Battery to
Supplement the AC Input Current
• Autonomous Power Source Selection (AC
Adapter or BAT)
• Supports Up to 2-A Total Current
• Thermal Regulation for Charge Control
• Charge Status Outputs for LED or System
Interface Indicates Charge and Fault
Conditions
• Reverse Current, Short-Circuit, and Thermal
Protection
• Power Good Status Outputs
DESCRIPTION
The bq24070 device is a highly integrated Li-ion
linear charger and system power-path management
device targeted at space-limited portable
applications. The bq24070 offers DC supply (AC
adapter) power-path management with autonomous
power-source selection, power FETs and current
sensors, high-accuracy current and voltage
regulation, charge status, and charge termination, in
a single monolithic device.
The bq24070 powers the system while independently
charging the battery. This feature reduces the charge
and discharge cycles on the battery, allows for
proper charge termination and allows the system to
run with an absent or defective battery pack. This
feature also allows for the system to instantaneously
turn on from an external power source in the case of
a deeply discharged battery pack. The IC design is
focused on supplying continuous power to the
system when available from the AC adapter or
battery sources.
APPLICATIONS
• Smart Phones and PDA
• MP3 Players
• Digital Cameras and Handheld Devices
• Internet Appliances
AC Adapter
IN
VDC
POWER FLOW DIAGRAM ⁽¹⁾
(2)
OUT
GND
Q1
40 mΩ
BAT
Q2
bq24070
PACK+
+
PACK−
(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.
System
UDG−04082
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.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2006, Texas Instruments Incorporated