RT8030

2

DS8030-02

March 2011

www.richtek.com

Functional Pin Description

Pin No.

Pin N ame

Pin Function

1

SH DN/RT

Oscillator Resistor Input. Connecting a resistor to ground from this pin sets the switching

2

GND

Signal Ground. All small-signal components and compensation components should

connect to this ground, which in turn connects to PGND at one point.

3

LX

Internal Power MOSFET Switches Output. Connect this pin to the inductor.

4

PGND

Power Ground. Connect this pin close to the (

5

PVDD

Power Input Supply. D ecouple this pin to PGND with a capacitor.

6

VD D

PVDD.

7

FB

Feedback Pin. Receives the feedback voltage from a resistive divider connected across

the output.

8

COMP

Error Amplifier Compensation Point. The current comparator threshold increases with

this control voltage. Connect external compensation elements to this pin to stabilize the

control loop.

Function Block Diagram

Driver

NISEN

Control

Logic

NMOS I Limit

0.9V

0.7V

0.4V

OC

Limit

ISEN

Slope

Com

OSC

Output

Clamp

EA

0.8V

Int-SS

POR

OTP

COMP

GND

FB

PVDD

PGND

LX

VDD

SD

SHDN/RT