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IR3871M Datasheet(PDF) 4 Page - International Rectifier |
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IR3871M Datasheet(HTML) 4 Page - International Rectifier |
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4 / 21 page  4 IR3871MPBF Pin Description NAME NUMBER I/O LEVEL DESCRIPTION NC 1 ----- No connection. ISET 2 Connecting resistor to PHASE pin sets over current trip point. PGOOD 3 5V Power good open drain output – pull up with a resistor to 3.3V. GND 4,17 Reference Bias return and signal reference. FB 5 3.3V Inverting input to PWM comparator, OVP / PGood sense. SS 6 3.3V Soft start/shutdown. This pin provides user programmable soft- start function. Connect an external capacitor from this pin to GND to set the startup time of the output voltage. The converter can be shutdown by pulling this pin below 0.3V. NC 7 ----- No connection. 3VCBP 8 3.3V LDO output. A minimum of 1.0 µF ceramic capacitor is required from 3VCBP to GND. NC 9 ----- No connection. VCC 10 5V Gate drive supply. A minimum of 1.0µF ceramic capacitor must be connected from this pin to the power return (PGND). PGND 11 Reference Power return. PHASE 12 VIN Phase node (or switching node) of MOSFET half bridge. VIN 13 VIN Input voltage for the system. BOOT 14 VIN +VCC Bootstrapped gate drive supply – connect a capacitor to PHASE. FF 15 VIN Input voltage feed forward – sets on-time with a resistor to VIN. EN 16 5V Enable pin to turn on and off the device. Use two external resistors to set the turn on threshold (see Electrical Specifications) for input voltage monitoring. |
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Similar Description - IR3871M |
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