BQ28Z560-R1 datasheet(14/60 Pages) TI1

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VDET1

VREL1

VDET2

BAT

VSS

PACK–

BAT

PACK –

DET3

Normal

Overcharge

Normal

Over-Discharge

Normal

DET2

Charger

Connected

Charger

Connected

Load

Connected

Shutdown

REL2

DET1

REL1

bq28z560-R1

SLUSBD3 – 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).

Discharge Overcurrent Detector and Short-Circuit Detector

If the voltage across both protection MOSFETs (VM – 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.

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