16

 2005 Semtech Corp.

POWER MANAGEMENT

SC4502/SC4502H

www.semtech.com

3.6 - 6V

4-CELL

VOUT

C1

2.2

µF

SC4502

2

3

1

6,7

8

4,5

GND

SHDN

SS

IN

SW

FB

ROSC

COMP

10

9

ON

OFF

R3

R4

10BQ015

D1

C2

10

µF

C3

47nF

R2

20K

35.7K

R1

60.4K

5V, 0.5A

7.68K

C4

1.5nF

L1

3.3

µH

C6

2.2

µF

L2

3.3

µH

C6

22pF

Figure 11(a). 1.5 MHz All Ceramic Capacitor 4-Cell to 5V SEPIC Converter.

L1 and L2: Coiltronics DRQ73-3R3

Figure 11(b). Load Transient Response of the Circuit in Figure

Upper Trace : Output Voltage, AC Coupled, 0.5V/div

40

µs/div

11(a). I

450mA at 1A/

µs.

Lower Trace : Input Inductor Current, 0.2A/div

Lower Trace : Input Inductor Current, 0.2A/div

Figure 11(c). Load Transient Response of the Circuit in Figure

Upper Trace : Output Voltage, AC Coupled, 0.5V/div

40

µs/div

11(a). I

700mA at 1A/

µs.

V

V

Typical Application Circuits