BQ24072 Datasheet, PDF (1/38 Pages) Texas Instruments – 1.2A USB-FRIENDLY Li-Ion BATTERY CHARGER AND POWER-PATH MANAGEMENT IC

bq24072, bq24073
bq24074, bq24075
www.ti.com...................................................................................................................................... SLUS810A – SEPTEMBER 2008 – REVISED DECEMBER 2008
1.5A USB-FRIENDLY Li-Ion BATTERY CHARGER AND POWER-PATH MANAGEMENT IC
FEATURES
1
• Fully Compliant USB Charger
– Selectable 100mA and 500mA Maximum
Input Current
– 100mA Maximum Current Limit Ensures
Compliance to USB-IF Standard
– Input based Dynamic Power Management
(V_IN-DPM) for Protection Against Poor USB
Sources
• 28V Input Rating with Overvoltage Protection
• Integrated Dynamic Power Path Management
(DPPM) Function Simultaneously and
Independently Powers the System and
Charges the Battery
• Supports up to 1.5A Charge Current with
Current Monitoring Output (ISET)
• Programmable Input Current Limit up to 1.5A
for Wall Adapters
• System Output Tracks Battery Voltage
(bq24072)
• Programmable Termination Current (bq24074)
• Battery Disconnect Function with SYSOFF
Input (bq24075)
• Programmable Pre-Charge and Fast-Charge
Safety Timers
• Reverse Current, Short-Circuit and Thermal
Protection
• NTC Thermistor Input
• Proprietary Start Up Sequence Limits Inrush
Current
• Status Indication – Charging/Done, Power
Good
• Small 3 mm × 3 mm 16 Lead QFN Package
APPLICATIONS
• Smart Phones
• Portable Media Players
• Portable Navigation Devices
• Low-Power Handheld Devices
DESCRIPTION
The bq2407x series of devices are integrated Li-ion
linear chargers and system power path management
devices targeted at space-limited portable
applications. The devices operate from either a USB
port or AC adapter and support charge currents up to
1.5A. The input voltage range with input overvoltage
protection supports unregulated adapters. The USB
input current limit accuracy and start up sequence
allow the bq2407x to meet USB-IF inrush current
specification. Additionally, the input dynamic power
management (V_IN-DPM) prevents the charger from
crashing incorrectly configured USB sources.
The bq2407x features dynamic power path
management (DPPM) that powers the system while
simultaneously and independently charging the
battery. The DPPM circuit reduces the charge current
when the input current limit causes the system output
to fall to the DPPM threshold; thus, supplying the
system load at all times while monitoring the charge
current separately. This feature reduces the number
of charge and discharge cycles on the battery, allows
for proper charge termination and enables the system
to run with a defective or absent battery pack.
Typical Application Circuit
1kW
1kW
IN
1mF
System
ON/OFF
Control
IN
13
8 _VSS
bq24075
15 SYSOFF
OUT 10
11
EN 2 5
BAT 2
3
TS ¹
4.7mF
SYSTEM
4.7mF
TEMP
PACK+
1.18kW 1.13kW
PACK-
1
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 © 2008, Texas Instruments Incorporated