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| BQ28550-R1 Datasheet, PDF (14/42 Pages) Texas Instruments – Single Cell Li-Ion Battery Gas Gauge | |||
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Not Recommended for New Designs
bq28550-R1
SLUSAS4A â OCTOBER 2012 â REVISED SEPTEMBER 2014
www.ti.com
Protection (continued)
In both the discharge overcurrent and short-circuit states, an internal discharge overcurrent release resistor (20
kΩ typ) is turned on (switched in between VM and VSS), allowing the VM pin to be pulled down to the VSS
potential if the load is released. If the VM â VSS voltage becomes lower than the discharge overcurrent detection
voltage (VDET3 = 0.150 V typ) for a period up to the discharge overcurrent release delay time (tREL3 = 4 ms typ),
the discharge overcurrent release resistor is turned off and the DOUT pin transitions to a high level, enabling
discharge of the battery by turning on the external discharge control N-channel MOSFET.
Normal
Discharge
Overcurrent
Normal
Discharge
Overcurrent
Normal
VDET1
VREL1
VDET2
BAT
VSS
BAT
VSS
PACKâ
BAT
VSHORT
VDET3
VSS
tOCD
Load
Connected
tOCR
Load
Disconnected
tSHORT
Load Short
Circuit
tOCR
14
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