BQ24020 Datasheet, PDF (1/20 Pages) Texas Instruments – SINGLE-CHIP,LI-ION AND LI-POL CHARGER IC WITH AUTONOMOUS USB-PORT AND AC-ADAPTER SUPPLY MANAGEMENT

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bq24020, bq24022, bq24023
bq24024, bq24025, bq24026
bq24027
SLUS549D – DECEMBER 2002 – REVISED MARCH 2006
SINGLE-CHIP, LI-ION AND LI-POL CHARGER IC WITH AUTONOMOUS USB-PORT AND
AC-ADAPTER SUPPLY MANAGEMENT (bqTINY™-II)
FEATURES
• Small 3 mm x 3 mm MLP Package
• Charges and powers Systems from Either AC
Adapter or USB With Autonomous
power-Source Selection
• Integrated USB Control With Selectable 100
mA and 500 mA Charge Rates
• Ideal for Low-Dropout Charger Designs for
Single-Cell Li-Ion or Li-pol Packs in Space
Limited portable applications
• Integrated power FET and Current Sensor for
Up to 1-A Charge applications From AC
Adapter
• Precharge Conditioning With Safety Timer
• power Good (AC Adapter Present) Status
Output
• Optional Battery Temperature Monitoring
Before and During Charge
• Automatic Sleep Mode for Low-power
Consumption
APPLICATIONS
• PDAs, MP3 Players
• Digital Cameras
• Internet appliances
• Smartphones
DESCRIPTION
The bqTINY-II series are highly-integrated, flexible
Li-Ion linear charge and system power management
devices for space-limited charger applications. In a
single monolithic device, the bqTINY-II offers
integrated USB-port and ac-adapter supply
management with autonomous power-source
selection, power-FET and current-sensor interfaces,
high-accuracy current and voltage regulation, charge
status, and charge termination.
The bqTINY-II automatically selects the USB-port or
the ac-adapter as the power source for the system.
In the USB configuration, the host can select from
two preset charge rates of 100 mA or 500 mA. In the
ac-adapter configuration, an external resistor sets
the system or charge current.
The bqTINY-II charges the battery in three phases:
conditioning, constant current, and constant voltage.
Charge is terminated based on minimum current. An
internal charge timer provides a backup safety for
charge termination. The bqTINY-II automatically
restarts the charge if the battery voltage falls below
an internal threshold. The bqTINY-II automatically
enters sleep mode when both supplies are removed.
AC
ADAPTER
VDC
GND
VBUS
USB
PORT _GND
D+
D−
bq24020DRC
1 AC
OUT 10
PACK+ BATTERY PACK
+
PACK−
2 USB
TS 9
3 STAT1 CE 8
4 STAT2 ISET2 7
5 VSS ISET1 6
R_SET
SYSTEM
SYSTEM
INTERFACE
UDG−02184
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.
bqTINY is a trademark of Texas Instruments.
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 © 2002–2006, Texas Instruments Incorporated