BQ28550-R1 Datasheet, PDF (13/42 Pages) Texas Instruments – Single Cell Li-Ion Battery Gas Gauge

Not Recommended for New Designs
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Protection (continued)
VDET1
VREL1
VDET2
Normal
Overcharge
bq28550-R1
SLUSAS4A – OCTOBER 2012 – REVISED SEPTEMBER 2014
Normal
Over-Discharge
Shutdown
Normal
BAT
VSS
BAT
V_SS
PACK–
BAT
VDET3
VSS
PACK –
tDET1
tREL1
tDET2
tREL2
Charger
Connected
Load
Connected
Charger
Connected
7.5.3 Discharge Overcurrent Detector and Short-Circuit Detector
If the voltage across both protection MOSFETs (V_M – V_SS) becomes higher than the discharge overcurrent
detection voltage (V_DET3 = 0.150 V typ) for a period of up to the discharge overcurrent detection delay time
(t_DET3 = 12 ms typ), the bq28550-R1 device detects the discharge overcurrent state of the battery and the DOUT
pin transitions to a low level. This prohibits discharging the battery by turning off the external discharge control N-
channel MOSFET.
Additionally, if the voltage across both protection MOSFETs (V_M – V_SS) becomes higher than the short-circuit
voltage (V_SHORT = V_BAT – 0.9 V typ) for a period of up to the discharge short-circuit detection delay time
(t_SHORT = 400 µs typ), the bq28550-R1 device detects a short-circuit of the battery and the DOUT pin transitions
to a low level. This prohibits discharging the battery by turning off the external discharge control N-channel
MOSFET.
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