MCR03EZPFX1002 datasheet(4/36 Pages) IRF

4 / 36 page

IR3837MPbF

Rev 1.31

Pin Description

Pin Name

Description

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

Vref

External reference voltage, can be used for margining operation. A

100nF capacitor should be connected between this pin and Gnd.

Comp

Output of error amplifier. An external resistor and capacitor network is

typically connected from this pin to Fb to provide loop compensation

Gnd

Signal ground for internal reference and control circuitry

Use an external resistor from this pin to Gnd to set the switching

frequency

OCset

Current limit set point. A resistor from this pin to SW pin will set the

current limit threshold

PGood

Power Good status pin. Output is open drain. Connect a pull up resistor

from this pin to Vcc

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.

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.

/LDO_out

Input Bias Voltage, output of internal LDO. Place a minimum 2.2µF cap

from this pin to PGnd

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.

Switch node. This pin is connected to the output inductor

PVin

Input voltage for power stage

Boot

Supply voltage for high side driver, a 100nF capacitor should be

connected between this pin and SW pin.

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.

Input to error amplifier for tracking purposes

Gnd

Signal ground for internal reference and control circuitry

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