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SC1652 Datasheet(PDF) 4 Page - Semtech Corporation |
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SC1652 Datasheet(HTML) 4 Page - Semtech Corporation |
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4 / 4 page  © 1997 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA 91320 MICROPOWER INVERTING DC-DC CONVERTER SC1652 January 29, 1998 PIN CONFIGURATION PIN DESCRIPTIONS PIN 1: V + 2.4V to 7V input supply voltage. PIN 2: V REF 1.22V reference output. Bypass with a 0.047µF capacitor to GND. Sourcing capability is guaranteed to be greater than 250µA. PIN 3: SHDN Logic input to shutdown the chip. >1.5V = normal operation, GND = shutdown. In shutdown mode DLOW and DHI pins are high. PIN 4: FB Feedback signal input to comparator. Connecting a resistance R1 to V OUT and a resistance R2 to V REF yields the output voltage: PIN 5: GND Power ground. PIN 6: DLOW Driver sinking output. Connected to DHI when using an external P-channel MOSFET. When using an external PNP bipolar transistor, connect a resistor R B from this pin to DHI. RB value depends upon V +, inductor value and the PNP bipolar transistor. By adjusting the R B value, efficiency can be optimized. PIN 7: DHI Driver sourcing output. Connect to the gate of the external P-channel MOSFET or base of the PNP bipolar transistor. PIN 8: CL Current-limit input. This pin clamps the switch peak current under abnormal conditions. REF OUT V R2 R1 - V × = OUTLINE DRAWING SO-8 |
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Similar Description - SC1652 |
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