BQ24314C Datasheet, PDF (8/26 Pages) Texas Instruments – Li+ Charger Front-End Protection IC

bq24314C
SLUSAV3A – AUGUST 2012 – REVISED JULY 2015
7 Detailed Description
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7.1 Overview
The bq24314C device is a highly integrated circuit designed to provide protection to Li-ion batteries from failures
of the charging circuit. The device continuously monitors the input voltage, the input current, and the battery
voltage. In case of an input overvoltage condition, the device immediately removes power from the charging
circuit by turning off an internal switch. In the case of an overcurrent condition, it limits the system current at the
threshold value, and if the overcurrent persists, switches the pass element OFF after a blanking period. If the
battery voltage rises to an unsafe level, the device disconnects power from the charging circuit until the battery
voltage returns to an acceptable value. Additionally, the device also monitors its own die temperature and
switches off if it exceeds 140°C. The input overcurrent threshold is user-programmable. The device can be
controlled by a processor and also provides status information about fault conditions to the host.
7.2 Functional Block Diagram
IN
ILIM
Q1
Charge Pump,
Bandgap,
Bias Gen
V_BG
ISNS
ILIMREF
Current limiting
loop
OCP comparator
ILIMREF - Δ
ISNS
t _BLANK(OCP)
OFF
VIN _VBG
OVP
VIN
VBG
UVLO
t _DGL(PGOOD)
COUNTERS,
CONTROL,
AND STATUS
THERMAL
SHUTDOW
t _DGL(BOVP)
VBG
OUT
FAULT
CE
VBAT
8
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