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IR3628MPBF

HIGH FREQUENCY SYNCHRONOUS PWM BUCK CONTROLLER

International Rectifier 

IR3628MPbF

Pin Description

Pin Name

Description

1 Vref External reference voltage. Drive capability for this pin is 2uA.

2 Vcc This pin provides power for the internal blocks of the IC as well as powers

the low side driver. A minimum of 0.1uF, high frequency capacitor must

be connected from this pin to power ground.

3 LDrv Output driver for low side MOSFET

4 PGnd Power Ground. This pin serves as a separate ground for the MOSFET

drivers and should be connected to the system’s power ground plane.

5 HDrv Output driver for high side MOSFET

6

Vc This pin powers the high side driver and must be connected to a voltage

higher than bus voltage. A minimum of 0.1uF, high frequency capacitor

must be connected from this pin to power ground.

7

Vp Non inverting input of error amplifier, this pin can be used for tracking

application.

8

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.

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

typically connected from this pin to ground to provide loop compensation.

10 Gnd Signal ground for internal reference and control circuitry.

11 SS/SD Soft start / shutdown. This pin provides user programmable soft-start

function. Connect an external capacitor from this pin to ground to set the

start up time of the output voltage. The converter can be shutdown by

pulling this pin below 0.3V.

12 OCSet Current limit set point. A resistor from this pin to drain of low side

MOSFET will set the current limit threshold.

08/10/2007

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