SC4503EVB View Datasheet(PDF) - Semtech Corporation

Part Name

Description

Manufacturer

SC4503EVB

1.3MHz Step-Up Switching Regulator with 1.4A Switch

Semtech Corporation 

SC4503

POWER MANAGEMENT

Typical Application Circuits

2.6 - 4.2V

1-CELL

LI-ION

L1

C5

3.3µH

2.2µF

5

R3

8.06k

IN

1

SW

C1

SC4503

1µF

4 SHDN/SS

FB 3

C3

0.22µF

GND

2

D1

10BQ015

L2

3.3µH

VOUT

3.3V, 0.45A

C4 R1

15pF 412k

C2

10µF

R2

249k

L1 and L2: Coiltronics DRQ73-3R3

C1: Murata GRM188R61A105K

C2: Murata GRM21BR60J106K

C5: Murata GRM188R61A225K

Figure 12(a). Single Li-ion Cell to 3.3V SEPIC Converter.

Efficiency vs Load Current

85

80 VOUT = 3.3V

75

70

65

60

55

50

45

VIN = 2.6V

40

VIN = 3.6V

35

30

0.001

0.010

VIN = 4.2V

0.100

1.000

Load Current (A)

VIN = 3.6V

40µs/div

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

Lower Trace : Input Inductor Current, 0.2A/div

Figure 12(b). Efficiency vs Load Current

 2007 Semtech Corp.

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

in Figure 12(a). IOUT is switched between

100mA and 500mA

18

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