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| BQ28Z560-R1 Datasheet, PDF (14/60 Pages) Texas Instruments – Single Cell Li-Ion Battery Gas Gauge and Protection | |||
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bq28z560-R1
SLUSBD3 â APRIL 2013
www.ti.com
In the over-discharge state, if a charger is connected, the external discharge control MOSFET conducts the
charge current through its parasitic body diode. If the VBAT voltage becomes greater than the over-discharge
detection voltage (VDET2 = 2.3 V typ) for a period up to the overcharge release delay time (tREL2 = 4 ms typ), the
DOUT pin transitions to a high-level enabling discharge of the battery by turning on the external discharge control
N-channel MOSFET. After detecting over-discharge, the device stops all operations and enters standby, which
reduces the current consumed by the IC to its lowest mode (standby current).
Normal
Overcharge
Normal
Over-Discharge
Shutdown
Normal
VDET1
VREL1
VDET2
BAT
VSS
BAT
VSS
PACKâ
BAT
VDET3
VSS
PACK â
tDET1
tREL1
tDET2
tREL2
Charger
Connected
Load
Connected
Charger
Connected
Discharge Overcurrent Detector and Short-Circuit Detector
If the voltage across both protection MOSFETs (VM â VSS) becomes higher than the discharge overcurrent
detection voltage (VDET3 = 0.150 V typ) for a period of up to the discharge overcurrent detection delay time
(tDET3 = 12 ms typ), the bq28z560-R1 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.
14
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