BQ28550-R1 datasheet(14/42 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

Not Recommended for New Designs

bq28550-R1

SLUSAS4A – OCTOBER 2012 – REVISED SEPTEMBER 2014

www.ti.com

Protection (continued)

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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