Datasheet

LTC2954
14
2954fb
External Pull-Up Resistor On PB
An internal pull-up resistor on the PB pin makes an ex-
ternal pull-up resistor unnecessary. Leakage current on
the PB board trace, however, will affect the open circuit
voltage on the PB pin. If the leakage is too large (>2μA),
the PB voltage may fall close to the threshold window. To
mitigate the effect of the board leakage, a 10k resistor to
V
IN
is recommended (see Figure 9).
Figure 9. External Pull-Up Resistor On PB Pin
Reverse Battery Protection
To protect the LTC2954 from a reverse battery connec-
tion, place a 1k resistor in series with the V
IN
pin (see
Figure 10).
TYPICAL APPLICATIONS
PB
V
IN
LTC2954-1/
LTC2954-2
GND
EXTERNAL BOARD
LEAKAGE CURRENT
100k
2.4V
R7
10k
2954 F09
>2μA
PINS OMITTED
FOR CLARITY
IF EXTERNAL PARASITIC BOARD
LEAKAGE >2μA, USE EXTERNAL
PULL-UP RESISTOR
V
IN