1.5A STEP-DOWN/STEP-UP/INVERTING DC-DC CONVERTER

AZ34063A

Data Sheet

9

Sep. 2006 Rev. 1. 3

BCD Semiconductor Manufacturing Limited

Figure 11. Step-Down converter (Note 6)

Typical Applications (Continued)

+

-

Ipk

B

1.25V

Reference

Regulator

A

1

S

R

Q

I

PK

C

T

OSC

V

C1

100

µF

Rsc

0.33

L2 1.0

µH

C3

100

µF

Optional

Filter

5V/500mA

V

OUT

D1

1N5819

L1

220

µH

C

T

470 pF

+

+

R1 3.6k

R2

1.2k

C2

470

µF

+

U1 AZ34063A

2

3

4

5

6

7

8

V

OUT

Note 6: This is a typical step-down converter configuration. The working process in the steady state is similar to

(R1+R2)/R2 (V).