Texas Instruments BQ769142, Manual

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7.24 Internal Oscillators
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
High-frequency Oscillator
f
HFO
Operating frequency 16.78 MHz
f
HFO(ERR)
Frequency error
(3)
T
A
= -40°C to +85°C, includes frequency
drift
–4.0 ±0.25 4.0 %
f
HFO(SU)
Start-up time
(2)
T
A
= -40°C to +85°C, at power-up from
SHUTDOWN or exiting DEEPSLEEP
mode, oscillator frequency within ±3% of
nominal
4.3 ms
T
A
= -40°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
(3)
Full-speed setting, T
A
= -10°C to +60°C,
includes frequency drift
–1.5 ±0.25 1.5 %
Full-speed setting, 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) 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) Specified by design
(3) 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
= 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_HI)
CHG pin voltage with
respect to BAT, DSG
pin voltage with
respect to BAT, 8 V ≤
V
BAT
≤ 80 V, V
LD
≤
V
DSG
(2)
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
(2)
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
≤ 80 V, V
LD
≤
V
DSG
(2)
CHG/DSG C
L
= 20 nF, charge pump low
overdrive setting
4.5 5.7 7 V
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BQ769142
SLUSE91A – SEPTEMBER 2020 – REVISED FEBRUARY 2021
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