RT8063

2

DS8063-07

November 2012

www.richtek.com

©

Copyright

2012 Richtek Technology Corporation. All rights reserved.

is a registered trademark of Richtek Technology Corporation.

Functional Pin Description

Pin No.

Pin Name

Pin Function

1

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.

2,

9 (Exposed Pad)

GND

Ground. The exposed pad must be soldered to a large PCB and connected to GND

for maximum power dissipation.

3

EN

Enable Control Input. Float or connect this pin to logic high for enable. Connect to

GND for disable.

4

VIN

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

5, 6

LX

Internal Power MOSFET Switches Output. Connect these pins to the inductor

together.

7

RT

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

switching frequency. If this pin is floating, the frequency will be set at 2MHz

internally.

8

FB

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

the output.

Typical Application Circuit

Note : Using all Ceramic Capacitors

3

EN

VIN

4

RT8063

2.7V to 5.5V

RT

7

LX

5, 6

COMP

FB

8

1

GND

2,

9 (Exposed Pad)

L

10µF

R1

R2

R1 (k

Ω)

R2 (k

Ω)

L (

μH)

3.3

75

24

33

560

2

22

2.5

51

24

22

560

2

22

1.8

30

24

15

560

1.5

22

1.5

21

24

13

560

1.5

22

1.2

12

24

11

560

1.5

22

1.0

6

24

8.2

560

1.5

22