BQ28Z560-R1 datasheet(15/60 Pages) TI1

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DET1

VREL1

tOCD

VDET2

BAT

VSS

BAT

PACK–

BAT

VDET3

Normal

Discharge

Overcurrent

Normal

tSHORT

tOCR

Load

Connected

VSHORT

Load Short

Circuit

Load

Disconnected

Discharge

Overcurrent

VSS

bq28z560-R1

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SLUSBD3 – APRIL 2013

Additionally, if the voltage across both protection MOSFETs (VM – VSS) becomes higher than the short-circuit

voltage (VSHORT = VBAT – 0.9 V typ) for a period up to the discharge short-circuit detection delay time

(tSHORT = 400 µs typ), the bq28z560-R1 detects 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.

In both the discharge overcurrent and short-circuit states, an internal discharge overcurrent release resistor (20

Ω 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 – 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.

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