BQ24232H Datasheet, PDF (1/37 Pages) Texas Instruments – USB-Friendly Lithium-Ion Battery Charger and Power-Path Management IC

www.ti.com
bq24230H
bq24232H
SLUSBI8 – JANUARY 2014
USB-Friendly Lithium-Ion Battery Charger and Power-Path Management IC
Check for Samples: bq24230H, bq24232H
FEATURES
1
•2 Fully Compliant USB Charger
– Selectable 100-mA and 500-mA Maximum
Input Current
– 100-mA Maximum Current Limit Ensures
Compliance to USB-IF Standard
– Input-based Dynamic Power Management
(V_IN-– DPM) for Protection Against Poor
USB Sources
• 28-V Input Rating With Overvoltage Protection
• 4.35-V Battery Regulation
• Integrated Dynamic Power-Path Management
(DPPM) Function Simultaneously and
Independently Powers the System and
Charges the Battery
• Supports up to 500-mA Charge Current With
Current Monitoring Output (ISET)
• Programmable Input Current Limit up to
500 mA for Wall Adapters
• Programmable Termination Current
(bq24232H)
• Programmable Precharge 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
DESCRIPTION
The bq2423xH series of devices are highly 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 between 25 mA and 500 mA. The high-input-
voltage range with input overvoltage protection
supports low-cost, unregulated adapters. The USB
input current limit accuracy and start-up sequence
allow the bq2423xH to meet USB-IF inrush current
specification. Additionally, the input dynamic power
management (V_IN-DPM) prevents the charger from
crashing poorly designed or incorrectly configured
USB sources.
The bq2423xH 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.
Additionally, this enables instant system turn-on even
with a totally discharged battery. The power-path
management architecture also permits the battery to
supplement the system current requirements when
the adapter cannot deliver the peak system currents,
enabling the use of a smaller adapter.
TYPICAL APPLICATION CIRCUIT
1 kΩ
1 kΩ
APPLICATIONS
• Bluetooth™ Devices
• Low-Power Handheld Devices
Adaptor
DC
1mF
GND
IN
13
8 VSS
bq24232H
15 TD
OUT 10
11
EN2 5
BAT 2
3
TS ¹
4.7mF
4.7mF
TEMP
PACK+
SYSTEM
2.94 kΩ 4.32 kΩ
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.
Bluetooth is a trademark of Bluetooth SIG, Inc..
2
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 © 2014, Texas Instruments Incorporated