RT8030 datasheet(2/11 Pages) RICHTEK

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RT8030

DS8030-02

March 2011

www.richtek.com

Functional Pin Description

Pin No.

Pin N ame

Pin Function

SH DN/RT

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

frequency. Forcing this pin to VDD causes the device to be shut down.

GND

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

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

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

PGND

Power Ground. Connect this pin close to the (

−) terminal of CIN and COUT.

PVDD

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

VD D

Signal Input Supply. Decouple this pin to GND w ith a capacitor. Normally VDD is equal to

PVDD.

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

the output.

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

Limit

ISEN

Slope

Com

OSC

Output

Clamp

0.8V

Int-SS

POR

OTP

VREF

COMP

GND

PVDD

PGND

VDD

SHDN/RT

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