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LTC1163CS8 Datasheet(PDF) 6 Page - Linear Technology |
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LTC1163CS8 Datasheet(HTML) 6 Page - Linear Technology |
6 / 8 page 6 LTC1163/LTC1165 APPLICATIO S I FOR ATIO Figure 1. Powering a Large Capacitive Load on a 3.3V supply which is compatible with 5V TTL and CMOS logic. (The LTC1163/LTC1165 cannot however, be driven by 3V logic when powered from a 5V supply because the threshold is approximately 2.5V.) TYPICAL APPLICATIO S PCMCIA Card 3.3V/5V VCC Switch VS LTC1165 OUT1 OUT2 OUT3 GND IN1 IN2 IN3 VCC 5V VCC 3V PCMCIA CONTROLLER + 10 µF 5V PC CARD SOCKET MMDF3N02HD + 1 µF 1/2 MMDF3N02HD VCC 3.3V LTC1163/65 • TA03 NOTE: USE LTC1163 WITH NONINVERTING PCMCIA CONTROLLERS managed by the system regulator. R2 is required to eliminate the possibility of parasitic MOSFET oscillations during switch transitions. It is a good practice to isolate the gates of paralleled MOSFETs with 1k resistors to decrease the possibility of interaction between switches. Mixed 5V/3V Systems Because the input ESD protection diodes are referenced to ground instead of the supply pin, it is possible to drive the LTC1163/LTC1165 inputs from 5V CMOS or TTL logic even though the LTC1163/LTC1165 are powered from a 3.3V supply as shown in Figure 2. The input threshold voltage is approximately 50% of the supply voltage or 1.6V Reverse Battery Protection The LTC1163/LTC1165 can be protected against reverse battery conditions by connecting a 150 Ω resistor in series with the ground pin or supply pin. The resistor limits the supply current to less than 24mA with –3.6V applied. Because the LTC1163/LTC1165 draw very little current while in normal operation, the drop across the resistor is minimal. The 3.3V µP(orcontrollogic)canbeprotectedby adding 10k resistors in series with the input pins. Figure 2. Direct Interface to 5V Logic VS 1/3 LTC1163 OUT1 GND IN1 ON/OFF R1 100k R2 1k C1 0.1 µF 3.3V LOAD + CL 100 µF VIN LT1129-3.3 3.3 µF + MTD3055EL 3.3V LTC1163/65 • F01 VS 1/3 LTC1163 OUT1 GND IN1 3.3V LOAD 3.3V MTD3055EL LTC1163/65 • F01 5V |
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