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Typical values stated where T
A
= 25°C and V
BAT
= 55.0 V, min/max values stated where T
A
= -40°C to 85°C and V
BAT
= 4.7 V
to 55 V (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
V
(CHGFETOFF)
CHG off voltage with
respect to BAT
CHG/DSG C
L
= 20 nF, steady state value 0.4 V
V
(DSGFETOFF)
DSG off voltage with
respect to LD
CHG/DSG C
L
= 20 nF, steady state value 0.7 V
t
(FET_ON)
CHG and DSG rise
time
CHG/DSG C
L
= 20 nF, R
GATE
= 100 Ω, 0.5
V to 4 V gate-source overdrive, charge pump
mode
(3) (4)
21 40 µs
t
(CHGFETOFF)
CHG fall time to BAT
CHG C
L
= 20 nF, R
GATE
= 100 Ω, 90% to
10% of V
(FETON)
(4)
46 65 µs
t
(DSGFETOFF)
DSG fall time to LD
DSG C
L
= 20 nF, R
GATE
= 100 Ω, 90% to 10%
of V
(FETON)
(4)
2 20 µs
t
(CP_START)
Charge pump start up
time C
L
= 20 nF, C
(CP1)
= 470 nF, 10% to 90% of
V
(FETON)
100 ms
C
(CP1)
Charge pump
capacitor
(2)
100 470 2200 nF
(1) When the DSG driver is enabled, the CHG driver is disabled, and a voltage is applied at the LD pin such that V
LD
> V
DSG
, the voltage
at DSG will rise to ≈ V
LD
- 0.7 V
(2) Specified by design
(3) Specified by characterization
(4) R
GATE
can be optimized during design and system evaluation for best performance. A larger value may be desired to avoid an overly
fast FET turn off, which can result in a large voltage transient due to cell and harness inductance.
7.26 Comparator-Based Protection Subsystem
Typical values stated where T
A
= 25°C and V
BAT
= 55.0 V, min/max values stated where T
A
= -40°C to 85°C and V
BAT
= 4.7 V
to 55 V (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
V
(OVP)
Overvoltage detection range Nominal setting (50.6 mV steps)
1.012 V
to 5.566
V in 50.6
mV steps
V
V
(OVP_ACC)
Overvoltage detection voltage
threshold accuracy
(3)
T
A
= +25°C, nominal setting between
1.012 V and 5.566 V
(1)
±2 mV
T
A
= +25°C, nominal setting between
3.036 V and 5.06 V
(1)
–10 10 mV
T
A
= –10°C to +60°C, nominal setting
between 1.012 V and 5.566 V
(1)
±3 mV
T
A
= –10°C to +60°C, nominal setting
between 3.036 V and 5.06 V
(1)
–15 15 mV
T
A
= –40°C to +85°C, nominal setting
between 1.012 V and 5.566 V
(1)
±5 mV
T
A
= –40°C to +85°C, nominal setting
between 3.036 V and 5.06 V
(1)
–25 25 mV
V
(OVP_DLY)
Overvoltage detection delay
(2)
Nominal setting (3.3 ms steps)
10 ms to
6753 ms
in 3.3 ms
steps
ms
V
(UVP)
Undervoltage detection range Nominal setting (50.6 mV steps)
1.012 V
to 4.048
V in 50.6
mV steps
V
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BQ76942
SLUSE14B – DECEMBER 2020 – REVISED DECEMBER 2021
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