SC4503EVB View Datasheet(PDF) - Semtech Corporation

Part Name

Description

MFG CO.

SC4503EVB

1.3MHz Step-Up Switching Regulator with 1.4A Switch

Semtech Corporation 

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POWER MANAGEMENT

Typical Application Circuits

VIN

3.3V

L1

D1

2.7µH

10BQ015

5

R3

15k IN

1

SW

C1

2.2µF

SC4503

4 SHDN/SS

FB 3

C3

56nF

GND

2

VOUT

12V

C4

R1

2.2pF 866k

C2

4.7µF

R2

100k

L1: Coiltronics LD1

C1: Murata GRM188R61A225K

C2: Murata GRM21BR61C475K

Figure 10(a). 3.3V to 12V Boost Converter with Soft-start

SC4503

Efficiency vs Load Current

95

1.3MHz

90

85

80

75

70

65

60

55

VOUT = 12V

50

0.001

0.010

0.100

Load Current (A)

1.000

40µs/div

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

Lower Trace : Input Inductor Current, 0.5A/div

Figure 10(b). Efficiency vs Load Current

 2007 Semtech Corp.

Figure 10(c). Load Transient Response of the Circuit

in Figure 10(a). IOUT is switched between

90mA and 280mA

16

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