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Typical values stated where T
A
= 25°C and V
BAT
= 59.2 V, min/max values stated where T
A
= -40°C to 85°C and V
BAT
= 4.7 V
to 80 V (unless otherwise noted)
(1)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
V
(FETON_LO_LOBAT)
CHG pin voltage with
respect to BAT, DSG
pin voltage with
respect to BAT, 4.7 V
≤ V
BAT
< 8 V, V
LD
≤
V
DSG
(2)
CHG/DSG C
L
= 20 nF, charge pump low
overdrive setting
3.5 5 7 V
V
(SRCFOL_FETON)
DSG on voltage with
respect to BAT
CHG/DSG C
L
= 20 nF, source follower mode 0 V
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
high overdrive setting
(4) (5)
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)
(5)
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)
(5)
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
(3)
100 470 2200 nF
(1) Operation with V
BAT
up to 80 V is supported when the charge pump is not in operation. Whenever the charge pump is in operation (in
5.5 V or 11 V mode), the maximum voltage on V
BAT
should be reduced to ensure the voltage on CP1, CHG, and DSG does not exceed
their maximum specified voltage.
(2) 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
(3) Specified by design
(4) Specified by characterization
(5) 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
= 59.2 V, min/max values stated where T
A
= -40°C to 85°C and V
BAT
= 4.7 V
to 80 V (unless otherwise noted)
(1)
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
(4)
T
A
= +25°C, nominal setting between
1.012 V and 5.566 V
(2)
±2 mV
T
A
= +25°C, nominal setting between
3.036 V and 5.06 V
(2)
–10 10 mV
T
A
= -10°C to +60°C, nominal setting
between 1.012 V and 5.566 V
(2)
±3 mV
T
A
= -10°C to +60°C, nominal setting
between 3.036 V and 5.06 V
(2)
–15 15 mV
T
A
= -40°C to +85°C, nominal setting
between 1.012 V and 5.566 V
(2)
±5 mV
T
A
= -40°C to +85°C, nominal setting
between 3.036 V and 5.06 V
(2)
–25 25 mV
BQ769142
SLUSE91A – SEPTEMBER 2020 – REVISED FEBRUARY 2021
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