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LTC4055 Datasheet(PDF) 14 Page - Linear Technology |
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LTC4055 Datasheet(HTML) 14 Page - Linear Technology |
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14 / 16 page  LTC2951 14 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). PB VIN LTC2951-1/ LTC2951-2 GND EXTERNAL BOARD LEAKAGE CURRENT 100k 2.4V R7 10k 2951 F09 >2 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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