LTC2954 Linear Technology, LTC2954 Datasheet - Page 14

• Manufacturer Part Number: LTC2954
• Description: Push Button On/Off Controller
• Manufacturer: Linear Technology

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