2

FR97063-1.1-JUN-2012

FR97063

85T

fitipower integrated technology lnc.

Typical Application Circuit

FR97063

6.8

NOT USED

NC

GND

SW

3

VOUT

3.3V

VIN

4.5V to 23V

FB

5

L1

4.7

μH

C4

C2

4

7

OFF ON

EN

C1

10μF/25V

CERAMIC

R1

30.9KΩ/1%

R2

10KΩ/1%

(optional)

22μF/6.3V

CERAMIC

C3

22nF

D1

B230A

Figure 2. Output 3.3V Application Circuit

Functional Pin Description

Pin Name

Pin No.

Pin Function

BS

1

Bootstrap.

A 22nF capacitor is connected between SW and BS pins to drive the power switch’s gate

above the supply voltage.

VIN

2

Power Supply Input.

Drive 4.5V~23V voltage to this pin to power on this chip.

Connect a 10µF ceramic

bypass capacitor between VIN and GND to eliminate noise.

SW

3

Switch Output.

Connect this pin to the switching end of the inductor.

GND

4

Ground.

This pin is the voltage reference for the regulated output voltage.

For this reason, care must be

taken in its layout.

FB

5

Feedback.

An external resistor divider from the output to GND, tapped to the FB pin sets the output

voltage.

NC

6, 8

No Connection.

EN

7

On/Off Control Input.

Pull EN above 1.2V and below 5V to turn the device on.