RT8015A

2

DS8015A-04 March 2011

www.richtek.com

Functional Pin Description

Pin No.

Pin Name

Pin Function

1

SHDN/RT

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

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, 4

LX

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

5

PGND

6, 7

PVDD

Power Input Supply. Decouple this pin to PGND with a capacitor.

8

VDD

equal to PVDD.

9

FB

Feedback Pin. This pin Receives the feedback voltage from a resistive divider

connected across the output.

10

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.

11 (Exposed Pad) NC

No Internal Connection. The exposed pad must be soldered to a large PCB and

connected to GND for maximum power dissipation.

Typical Application Circuit

Note : Using all Ceramic Capacitors

COMP

FB

SHDN/RT

LX

RT8015A

1

3, 4

8

9

VDD

PVDD

GND

6, 7

5

PGND

2

10

5V

2.5V/3A

332k

L1

2µH

30k

22µF

R2 240k

1000pF

R1

510k

22µFx2

22pF