BQ24232HA Datasheet, PDF (1/36 Pages) Texas Instruments – USB-Friendly Lithium-Ion Battery Charger

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bq24232HA
SLUSCG4 – MAY 2016
bq24232HA 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
• 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
• 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
The bq24232HA 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.
The battery is charged in three phases: conditioning,
constant current, and constant voltage. In all charge
phases, an internal control loop monitors the IC
junction temperature and reduces the charge current
if the internal temperature threshold is exceeded.
The charger power stage and charge current sense
functions are fully integrated. The charger function
has high-accuracy current and voltage regulation
loops, charge status display, and charge termination.
The input current limit and charge current are
programmable using external resistors.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
bq24232HA
VQFN (16)
3.00 mm × 3.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Typical Application Circuit
3 Description
The bq24232HA device is a highly integrated Li-ion
linear charger and system power-path management
device targeted at space-limited portable applications.
The device operates from either a USB port or ac
adapter and supports 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
bq24232HA 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.
1
R5
1.5 kΩ
R6
1.5 kΩ
SYSTEM
Adaptor
DC +
GND
C1
1 μF
TEMP
PACK +
C3
4.7 μF
IN
OUT
VSS
bq24232HA
EN 2
EN 1
TS
CE
BAT
TMR
C2
4.7μF
R4
56 .2 kΩ
PACK -
R1
R2
R3
3.57 kΩ
3.06 kΩ 4 .32 kΩ
Copyright © 2016, Texas Instruments Incorporated
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.