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BQ24313DSGR Datasheet(PDF) 11 Page - Texas Instruments

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Part # BQ24313DSGR
Description  OVERVOLTAGE AND OVERCURRENT PROTECTION IC AND Li CHARGER FRONT-END PROTECTION IC
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

BQ24313DSGR Datasheet(HTML) 11 Page - Texas Instruments

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TYPICAL APPLICATION CIRCUIT
AC Adapter
VDC
GND
C
IN
1
7
2
5
4
6
8
bq24313
bq24315
bq24080
ChargerIC
SYSTEM
IN
OUT
VBAT
FAULT
CE
C
OUT
C
OUT
R
BAT
R
CE
Host
Controller
R
FAULT
V
PU
R
PU
1
F
m
1
F
m
100kW
47kW
47kW
47kW
R
ILM
DETAILED FUNCTIONAL DESCRIPTION
POWER DOWN
POWER-ON RESET
OPERATION
bq24313
bq24315
www.ti.com............................................................................................................................................... SLUS817A – MARCH 2008 – REVISED NOVEMBER 2008
VOVP = 5.85V, IOCP = 1000mA, BVOVP = 4.35V
Figure 22.
The bq24313 and bq24315 are integrated circuits designed to provide protection to Li-ion batteries from failures
of the charging circuit. The IC continuously monitors the input voltage, the input current and the battery voltage.
For an input overvoltage condition, the IC immediately removes power from the charging circuit by turning off an
internal switch. For 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 IC disconnects power from the charging circuit until the battery voltage returns to an acceptable
value. Additionally, the IC also monitors its own die temperature and switches off if it exceeds 140°C. The input
overcurrent threshold is user-programmable. The IC can be controlled by a processor, and also provides status
information about fault conditions to the host.
The device remains in power down mode when the input voltage at the IN pin is below the undervoltage
threshold UVLO. The FET Q1 connected between IN and OUT pins is off, and the status output, FAULT, is set to
Hi-Z.
The device resets when the input voltage at the IN pin exceeds the UVLO threshold. All internal counters and
other circuit blocks are reset. The IC then waits for duration tDGL(PGOOD) for the input voltage to stabilize. If, after
tDGL(PGOOD), the input voltage and battery voltage are safe, FET Q1 is turned ON. The IC has a soft-start feature
to control the inrush current. The soft-start minimizes the ringing at the input (the ringing occurs because the
parasitic inductance of the adapter cable and the input bypass capacitor form a resonant circuit). Because of the
deglitch time at power-on, if the input voltage rises rapidly to beyond the OVP threshold, the device will not
switch on at all, instead it will go into protection mode and indicate a fault on the FAULT pin.
The device continuously monitors the input voltage, the input current, and the battery voltage as described in
detail in the following sections.
Copyright © 2008, Texas Instruments Incorporated
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Product Folder Link(s): bq24313 bq24315


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