Datasheet

LTC2951-1/LTC2951-2
16
295112fb
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).
Reverse-Battery Protection
To protect the LTC2951 from a reverse-battery connec-
tion, place a 1k resistor (R8) in series with the V
IN
pin
(see Figure 10).
Figure 9. External Pull-Up Resistor on PB Pin
TYPICAL APPLICATIONS
PB
LTC2951-1/LTC2951-2
GND
EXTERNAL BOARD
LEAKAGE CURRENT
100k
2.4V
R7
10k
2951 F09
>2µA
PINS OMITTED
FOR CLARITY
IF EXTERNAL PARASITIC BOARD
LEAKAGE >2µA, USE EXTERNAL
PULL-UP RESISTOR
V
IN
V
IN