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IR3638SPBF

HIGH FREQUENCY SYNCHRONOUS PWM BUCK CONTROLLER FOR TRACKING APPLIACTIONS

International Rectifier 

IR3638SPbF

Pin Description

Pin Name

1

Fb

2 Vp / Enable

3

NC

4

Vcc

5

NC

6

LDrv

7

Gnd

8

PGnd

9

HDrv

10

Vc

11

NC

12

Comp

13

SS

14

NC

Description

Inverting input to the error amplifier. This pin is connected to the output of

the regulator via resistor divider to set the output voltage and provide

feedback to the error amplifier.

Dual function pin.

Non inverting input to the error amplifier.

Enable input.

No Connect

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.

No Connect

Output driver for low side MOSFET.

IC ground for internal control circuitry.

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

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

Output driver for high side MOSFET. The negative voltage at this pin may

cause instability for the gate drive circuit. To prevent this, a low forward

voltage drop diode (e.g. BAT54 or 1N4148) is required between this pin

and Power Ground.

This pin powers the high side driver.

No Connect

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

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

Soft start. 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.

No Connect

3/19/07

4

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