BQ2954 Datasheet, PDF (15/18 Pages) Texas Instruments – Lithium Ion Charge Management IC with Integrated Switching Controller

bq2954
Impedance (TA = TOPR; VCC = 5V ±10%)
Symbol
Parameter
Minimum
R_BATZ BAT pin input impedance
50
RSNSZ SNS pin input impedance
50
RTSZ
TS pin input impedance
50
R_PROG1
Soft-programmed pull-up or pull-down
resistor value (for programming)
-
R_PROG2 Pull-up or pull-down resistor value
-
RMTO Charge timer resistor
20
Typical
-
-
-
-
-
-
Maximum
-
-
-
10
3
480
Unit
MΩ
MΩ
MΩ
Notes
kΩ _{DSEL, CSEL}
kΩ I_TERM
kΩ
Timing (TA = TOPR; VCC = 5V ±10%)
Symbol
Parameter
t_MTO
Charge time-out range
tQT
Pre-charge qual test time-out period
tHO
Pre-charge qual test hold-off period
fPWM
PWM regulator frequency range
d_PWM
Duty cycle
Minimum Typical Maximum
1
-
24
-
0.25 ∗ tMTO
-
300
600
900
-
100
200
0
-
80
Unit
Notes
hours See Figure 10
-
ms
kHz See Equation 7
%
Capacitance
Symbol
CMTO
CPWM
Parameter
Charge timer capacitor
PWM capacitor
Minimum
Typical
Maximum
Unit
-
-
0.1
µF
-
0.001
-
µF
15