BQ28550DRZR-R1 datasheet(13/42 Pages) TI1

13 / 42 page

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

Not Recommended for New Designs

bq28550-R1

www.ti.com

SLUSAS4A – OCTOBER 2012 – REVISED SEPTEMBER 2014

Protection (continued)

7.5.3 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 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 (VM – VSS) becomes higher than the short-circuit

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

(tSHORT = 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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