BQ24250C_15 Datasheet, PDF (34/46 Pages) Texas Instruments – bq24250C 2A Single Input I2C, Standalone Switch-Mode Li-Ion Battery Charger with Power-Path Management

bq24250C
SLUSBY7 – JULY 2014
www.ti.com
9 Application and Implementation
9.1 Application Information
The bq24250C is a high-efficiency switch-mode charger. The device has integrated power FETs that are able to
charge at up to a 2-A charging rate, and an integrated 50-mA LDO. In I2C mode, the device has programmable
battery charge voltage (VBATREG), charge current (ICHG), input current limit (ILIM), and input over-voltage
protection threshold (VOVP). The charge current and the input current limit are programmed using external
resistors (RISET and RILIM) connected from the ISET and ILIM pins to ground. The range of these resistors can
be found in the datasheet. Both of these currents can be programmed up to 2 A. The device also has complete
system-level protection such as input under-voltage lockout (UVLO), input over-voltage protection (OVP), battery
OVP, sleep mode, thermal regulation and thermal shutdown, voltage-based NTC monitoring input, and safety
timers.
9.2 Typical Application
CPMID
1 µF
VIN
CIN
2.2 µF
PMID
IN
R1
VDPM
R2
3 MHz
PWM
LDO
1 2F
Charge Controller
STAT
SW
BOOT
PGND
SYS
LO
1.0 2H
CBOOT
33 nF
22 F
System Load
SCL
SDA
GPIO1
Host
GPIO2
GPIO3
GPIO4
V_GPIO
SCL
SDA
INT
/CE
EN1
EN2
BAT
TS
1 F
LDO
R3
TEMP
PACK+
R4
RNTC
PACK -
ILIM ISET
Figure 27. bq24250C Typical Application Circuit
34
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