17

© 2005 Semtech Corp.

www.semtech.com

POWER MANAGEMENT

SC4501

Typical Application Circuits

Figure 12(b). Load Transient Response of the Circuit in Figure

Upper Trace : Output Voltage, AC Coupled, 0.2V/div

40

µs/div

12(a). I

at 1A/

µs.

Lower Trace : Input Inductor Current, 0.2A/div

V

3.6 - 6V

4-CELL

VOUT

C1

2.2

µF

SC4501

2

3

1

5

6

4

GND

SHDN

SS

IN

SW

FB

ROSC

COMP

8

7

ON

OFF

C3

C4

R2

R1

R3

R4

10BQ015

D1

C2

10

µF

47nF

560pF

20K

20K

60.4K

5V

7.68K

C5

47pF

L1

4.9

µH

C6

2.2

µF

L2

4.9

µH

Figure 12(a). 1.5 MHz All Ceramic Capacitor 4-Cell to 5V SEPIC Converter. Pinout Shown is for MSOP-8.

L1 and L2: Coiltronics CTX5-1

Lower Trace : Input Inductor Current, 0.2A/div

Figure 12(c). Load Transient Response of the Circuit in Figure

Upper Trace : Output Voltage, AC Coupled, 0.2V/div

40

µs/div

12(a). I

at 1A/

µs.

V