BQ24232H_15 Datasheet, PDF (1/42 Pages) Texas Instruments – bq2423xx USB-Friendly Lithium-Ion Battery Charger and Power-Path Management IC

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bq24230H, bq24232H
SLUSBI8A – JANUARY 2014 – REVISED DECEMBER 2014
bq2423xx USB-Friendly Lithium-Ion Battery Charger and Power-Path Management IC
1 Features
•1 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
2 Applications
• Bluetooth^® Devices
• Low-Power Handheld Devices
3 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 from 25 mA to 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
specifications. 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 feature enables instant system turn-
on even with a totally discharged battery. The power-
path management architecture also lets the battery
supplement the system current requirements when
the adapter cannot deliver the peak system currents,
thus enabling the use of a smaller adapter.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
bq2423xx
VQFN (16)
3.00 mm x 3.00 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
Typical Application Circuit
1 kΩ
1 kΩ
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
PACK+
TEMP
SYSTEM
2.94 kΩ 4.32 kΩ
PACK-
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.