Texas Instruments BQ76942, Manual

Page: 18 / 85

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
f
HFO(ERR)
Frequency error
(2)
T
A
= –20°C to +70°C, includes frequency
drift
–3.0 ±0.25 3.0 %
T
A
= –40°C to +85°C, includes frequency
drift
–4.0 ±0.25 4.0 %
f
HFO(SU)
Start-up time
(1)
T
A
= –20°C to +85°C, at power-up from
SHUTDOWN or exiting DEEPSLEEP
mode, oscillator frequency within ±3% of
nominal
4.3 ms
T
A
= –20°C to +85°C, cases other than
power-up from SHUTDOWN or exiting
DEEPSLEEP mode, oscillator frequency
within ±3% of nominal
135 µs
Low-frequency Oscillator
f
LFO
Operating frequency
Full-speed setting 262.144 kHz
Low speed setting 32.768 kHz
f
LFO(ERR)
Frequency error
(2)
T
A
= –20°C to +70°C, includes frequency
drift
–1.5 ±0.25 1.5 %
T
A
= –40°C to +85°C, includes frequency
drift
–2.5 ±0.25 2.5 %
f
LFO(FAIL)
Failure detection frequency
Detects oscillator failure if the LFO
frequency falls below this level.
8.5 12 18 kHz
(1) Specified by design
(2) Specified by a combination of design and production test
7.25 High-Side NFET Drivers
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
(FETON_HI)
CHG pin voltage
with respect to BAT,
DSG pin voltage with
respect to BAT, 8
V ≤ V
BAT
≤ 55 V,
V
LD
≤ V
DSG
(1)
CHG/DSG C
L
= 20 nF, charge pump high
overdrive setting
10 11 13 V
V
(FETON_HI_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
(1)
CHG/DSG C
L
= 20 nF, charge pump high
overdrive setting
8 11 13 V
V
(FETON_LO)
CHG pin voltage
with respect to BAT,
DSG pin voltage with
respect to BAT, 8
V ≤ V
BAT
≤ 55 V,
V
LD
≤ V
DSG
(1)
CHG/DSG C
L
= 20 nF, charge pump low
overdrive setting
4.5 5.7 7 V
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
(1)
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
BQ76942
SLUSE14B – DECEMBER 2020 – REVISED DECEMBER 2021
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