SC4502 View Datasheet(PDF) - Semtech Corporation

Part Name

Description

MFG CO.

SC4502

1.4Amp, 2MHz Step-Up Switching Regulator with Soft-Start

Semtech Corporation 

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POWER MANAGEMENT

Typical Application Circuits

SC4502/SC4502H

4-CELL

3.6 - 6V

L1

3.3µH

C1

2.2µF

OFF ON 3

10

C3

47nF

8

6,7

IN

SHDN

SW

FB 2

SC4502

SS

COMP 1

GND ROSC

4,5 9

R4

7.68K

C6

2.2µF

R3

35.7K

C4

1.5nF

C6

22pF

D1

VOUT

5V, 0.5A

10BQ015

R1

60.4K

L2

3.3µH

C2

10µF

R2

20K

L1 and L2: Coiltronics DRQ73-3R3

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

VIN=3.6V

VIN=6V

40µs/div

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

Lower Trace : Input Inductor Current, 0.2A/div

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

11(a). ILOAD is switched between 150mA and

450mA at 1A/µs.

40µs/div

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

Lower Trace : Input Inductor Current, 0.2A/div

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

11(a). ILOAD is switched between 250mA and

700mA at 1A/µs.

 2005 Semtech Corp.

16

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