BQ24232HA Datasheet, PDF (26/36 Pages) Texas Instruments – USB-Friendly Lithium-Ion Battery Charger

bq24232HA
SLUSCG4 – MAY 2016
www.ti.com
8.2 Typical Application
See Figure 21 for the design example schematic.
V_IN = V_UVLO to V_OVP , I_FASTCHG = 200 mA, I_IN(MAX) = 500 mA, 25-mA Termination Current, ISET mode (EN1 = 0,
EN2 = 1), Battery Temperature Charge Range 0°C to 50°C, 7.5-hour Fast Charge Safety Timer.
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
Figure 21. Using the bq24232HA in a Stand-Alone Charger Application
8.2.1 Design Requirements
• Supply voltage = 5 V
• Fast-charge current of approximately 200 mA; ISET - pin 16
• Input Current Limit =500 mA; ILIM - pin 12
• Termination Current = 25 mA - pin 15 (bq24232HA)
• Safety timer duration, Fast charge = 7.5 hours; TMR – pin 14
• TS – Battery Temperature Sense = 10 kΩ NTC (103AT-2)
8.2.2 Detailed Design Procedure
8.2.2.1 Calculations
8.2.2.1.1 Program The Fast-Charge Current (ISET):
R_ISET = K_ISET / I_CHG
K_ISET = 870 AΩ from the Electrical Characteristics table.
R_ISET = 870 AΩ/0.2 A = 4.35kΩ
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