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IR3838MPBF Datasheet(PDF) 4 Page - International Rectifier |
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IR3838MPBF Datasheet(HTML) 4 Page - International Rectifier |
4 / 35 page 4 IR3838MPbF Rev 1.41 Pin Description Pin Name Description 1 Fb Inverting input to the error amplifier. This pin is connected directly to the output of the regulator via resistor divider to set the output voltage and provide feedback to the error amplifier 2 Vref External reference voltage, can be used for margining operation. A 100nF capacitor should be connected between this pin and Gnd. 3 Comp Output of error amplifier. An external resistor and capacitor network is typically connected from this pin to Fb to provide loop compensation 4 Gnd Signal ground for internal reference and control circuitry 5 Rt Use an external resistor from this pin to Gnd to set the switching frequency 6 OCset Current limit set point. A resistor from this pin to SW pin will set the current limit threshold 7 PGood Power Good status pin. Output is open drain. Connect a pull up resistor from this pin to Vcc 8 Sync External Synchronization, this pin is used to synchronize the device’s switching with an external clock. It is recommended that the external Sync clock be set to 20% above the free-running frequency. If not used, this pin can be left floating. 9 Vin Input voltage for Internal LDO. A 1.0µF capacitor should be connected between this pin and PGnd. If external supply is connected to Vcc/LDO_out pin, this pin should be left floating. 10 V CC /LDO_out Input Bias Voltage, output of internal LDO. Place a minimum 2.2µF cap from this pin to PGnd 11 PGnd Power Ground. This pin serves as a separated ground for the MOSFET drivers and should be connected to the system’s power ground plane. 12 SW Switch node. This pin is connected to the output inductor 13 PVin Input voltage for power stage 14 Boot Supply voltage for high side driver, a 100nF capacitor should be connected between this pin and SW pin. 15 Enable Enable pin to turn on and off the device, if this pin is connected to PVin pin through a resistor divider, input voltage UVLO can be implemented. 16 Vp Input to error amplifier for tracking purposes 17 Gnd Signal ground for internal reference and control circuitry |
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