LTC4055 datasheet(14/16 Pages) LINER

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LTC2951

2951f

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 VIN is recommended (see Figure 9).

VIN

LTC2951-1/

LTC2951-2

GND

EXTERNAL BOARD

LEAKAGE CURRENT

100k

2.4V

10k

2951 F09

µA

PINS OMITTED

FOR CLARITY

IF EXTERNAL PARASITIC BOARD

LEAKAGE >2

µA, USE EXTERNAL

PULL-UP RESISTOR

VIN

Figure 9. External Pull-Up Resistor on ⎯P⎯B Pin

Reverse Battery Protection

To protect the LTC2951 from a reverse battery connec-

tion, place a 1k resistor (R8) in series with the VIN pin

(see Figure 10).

TYPICAL APPLICATIO S

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