LTC2950 LINER [Linear Technology], LTC2950 Datasheet - Page 14

• Manufacturer Part Number: LTC2950
• Description: Push Button On/Off Controller
• Manufacturer: LINER [Linear Technology]

LTC2951
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
Reverse Battery Protection
To protect the LTC2951 from a reverse battery connec-
tion, place a 1k resistor (R8) in series with the V
(see Figure 10).
V
PB
IN
LTC2951-1/
LTC2951-2
2.4V
GND
100k
PINS OMITTED
FOR CLARITY
2951 F09
IN
2951f
pin