BQ24070_14 Datasheet, PDF (1/33 Pages) Texas Instruments – System Power-Path Management IC

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bq24070, bq24071
SLUS694G – MARCH 2006 – REVISED DECEMBER 2014
bq2407x Single-Chip Li-Ion Charge and System Power-Path Management IC
1 Features
•1 Small 3.5-mm × 4.5-mm VQFN 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
• 4.4-V and 6-V Options for System Output
Regulation Voltage
2 Applications
3 Description
The bq24070 and bq24071 are highly integrated Li-
ion linear charger and system power-path
management devices targeted at space-limited
portable applications. The bq2407x devices offer 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 bq2407x devices power 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.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
bq24070
bq24071
VQFN (20)
3.50 mm × 4.50 mm
• Smart Phones and PDAs
• MP3 Players
• Digital Cameras and Handheld Devices
• Internet Appliances
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
Simplified Schematic⁽¹⁾
AC Adapter
IN
VDC
(2)
OUT
GND
Q1
40 mΩ
Q2
bq24070/1
BAT
PACK+
+
PACK−
System
UDG−04082
(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.
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.