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| BQ24314 Datasheet, PDF (9/13 Pages) Texas Instruments – OVERVOLTAGE AND OVERCURRENT PROTECTION IC AND Li+ CHARGER FRONT-END PROTECTION IC | |||
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www.ti.com
bq24314
bq24316
SLUS763 â JULY 2007
Power Down
All IC functions OFF
FAULT = HiZ
V(IN) > V(UVLO) ? No
Yes
Reset
Timers reset
Counters reset
FAULT = HiZ
FET off
No
CE = Low ?
Any State
if V(IN) < V (UVLO),
go to Power Down
Any State
if CE = Hi,
go to Reset
V(IN) < V(OVP) ?
No
Yes
Turn off FET
FAULT = Low
No
I < IOCP ?
Yes
Turn off FET
FAULT = Low
No Incr OCP counter
No
CE = Hi ?
Yes Go to Reset
No
count <15 ?
Wait tON(OCP)
CE = Hi ?
Yes Go to Reset
Turn off FET
VBAT < BATOVP ?
No
FAULT = Low
Incr BAT counter
Yes
TJ < TJ(OFF) ? No
Yes
Turn on FET
FAULT = HiZ
Turn off FET
FAULT = Low
No
count <15 ?
Figure 9. Flow Diagram
CE Pin
The IC has an enable pin which can be used to enable or disable the device. When the CE pin is driven high, the
internal FET is turned off. When the CE pin is low, the FET is turned on if other conditions are safe. The CE pin
has an internal pulldown resistor and can be left floating. Note that the FAULT pin functionality is also disabled
when the CE pin is high.
Copyright © 2007, Texas Instruments Incorporated
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