BQ28550-R1 Datasheet, PDF (16/42 Pages) Texas Instruments – Single Cell Li-Ion Battery Gas Gauge

Not Recommended for New Designs
bq28550-R1
SLUSAS4A – OCTOBER 2012 – REVISED SEPTEMBER 2014
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7.5.6 Zero Voltage Charging
When the cell voltage is 0 V and if the charger voltage is above the minimum operating voltage for 0 V charging
(1.2-V max), the COUT output transitions to a high level and charge current can flow.
7.5.7 FET Control Protection
Figure 2 shows an overview of the FET Control Protection operation.
Shutdown
CHG: OFF
DSG: OFF
VREG: OFF
Attach a Charge
No Charger
Short-Circuit
Protection
CHG: ON
DSG: OFF
VREG: ON
VM >VBAT – 0.9 V
for a period of t > 400 µs
VM < 0.15 V
or
No Load detected
VBAT > 2.3 V
for a period of
t > 4.0 ms
Over-Discharge
Protection
CHG: ON
DSG: OFF
VREG: OFF
VBAT < 2.3 V
for a period of t > 24 ms
Overcurrent Protection
During Discharging
CHG: ON
DSG: OFF
VREG: ON
VM > 0.15 V for a period
of 12 ms
VM < 0.15 V or
No Load detected
for a period of 4.0 ms
Normal
CHG: ON
DSG: ON
VREG: ON
VM < –0.112 V
for a period of 12 ms
VBAT > 4.25 V
for a period
of 1.0 s
VBAT < 4.07 V
for a period of 8.0 ms
Overcurrent Protection
During Charging
CHG: OFF
DSG: ON
VREG: ON
Charger removed and
Load detected
for a period of 4.0 ms
Overcharge
Voltage Protection
CHG: OFF
DSG: ON
VREG: ON
Figure 2. FET Control Protection
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