SC4503EVB View Datasheet(PDF) - Semtech Corporation

Part Name

Description

Manufacturer

SC4503EVB

1.3MHz Step-Up Switching Regulator with 1.4A Switch

Semtech Corporation 

POWER MANAGEMENT

Typical Application Circuits

SC4503

D2

D3

D4

D5

OUT2

C5

0.1µF

C6

0.1µF

C7

0.1µF

26V (10mA)

C8

1µF

3.3V

3.3V

OFF ON

< 0.4V R3

RUN

17.8k

C1

4.7µF

L1

4.7µH

5

1

IN

SW

SC4503

4 SHDN/SS

FB 3

C3

56nF

GND

2

D1

10BQ015

C4

12pF

R1

309k

OUT1

9V (0.3A)

C2

4.7µF X 2

C9

0.1µF

R2

49.9k

D7

D6

OUT3

-8.5V (10mA)

C10

1µF

D2 - D7 : BAT54S

L1 : Sumida CDC5D23B-4R7M

C2: Murata GRM21BR61C475K

C1: Murata GRM188R61A105K

Figure 13(a). Triple-Output TFT Power Supply with Soft-Start

CH4

CH1

CH2

CH3

400µs/div

CH1 : OUT1 Voltage, 5V/div

CH2 : OUT2 Voltage, 20V/div

CH3 : OUT3 Voltage, 5V/div

CH4 : RUN Voltage, 5V/div

Figure 13(b). TFT Power Supply Start-up Transient as

the RUN Voltage is Stepped from 0 to

3.3V

40µs/div

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

Lower Trace : Inductor Current, 0.5A/div

Figure 13(c). Load Transient Response. IOUT1

is switched between 50mA and

350mA

 2007 Semtech Corp.

19

www.semtech.com

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