11/04/08

4

PD-60344

IR3810MPbF

Pin Description

Pins 4, 5 and 15 need to be connected together on system board.

Pin

Name

Description

1

Vp

Non-inverting input of error amplifier. This pin can be used for tracking application.

2

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.

3

Comp

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

connected from this pin to ground to provide loop compensation.

4

AGnd

Signal ground for internal reference and control circuitry.

5

AGnd

Signal ground for internal reference and control circuitry.

6

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.

7

OCSet

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

threshold.

8

V

CC

This pin powers the internal IC as well as low side driver. A minimum of 0.1uF high

frequency capacitor must be connected from this pin to the power ground.

9

Vref

External reference voltage. Drive capability for this pin is 2

μA.

10

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.

11

SW

Switch node. This pin is connected to the output inductor

12

V

IN

Input voltage connection pin

13

HG

This pin is connected to the high side gate driver. Connect a small capacitor from

this pin to switch node (SW).

14

V

C

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

input voltage. A minimum of 0.1uF high frequency capacitor must be connected

from this pin to the power ground for the charge-pump high side drive scheme.

15

AGnd

Signal ground for internal reference and control circuitry.