SC4501EVB View Datasheet(PDF) - Semtech Corporation

Part Name

Description

MFG CO.

SC4501EVB

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

Semtech Corporation 

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POWER MANAGEMENT

Typical Application Circuits

SC4501

2.6 - 4.2V

1-CELL

LI-ION

L1

D1

1.8µH

10BQ015

6

5

IN

OFF ON 3 SHDN

SW

FB 2

C1

2.2µF

SC4501

8

SS

COMP 1

C3

47nF

GND

4

ROSC

7

R4

10.7K

R3

17.4K

C4

1nF

R1

301K

VOUT

5V, 0.8A

R2

100K

C2

10µF

L1: Sumida CR43

95

VOUT = 5V

90

1.2MHz

85

80

Efficiency

VIN = 4.2V

75

70

65

60

VIN = 3.6V

55

VIN = 2.6V

50

0.001

0.010

0.100

Load Current (A)

1.000

Figure 11(a). 1.2 MHz All Ceramic Capacitor Single Li-ion Cell

to 5V Boost Converter.

Figure 11(b). Efficiency of the Single Li-ion Cell to 5V Boost

Converter in Figure 11(a).

VIN=2.6V

40µs/div

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

Lower Trace : Inductor Current, 0.5A/div

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

11(a). ILOAD is switched between 0.2A and 0.7A at

1A/µs.

© 2005 Semtech Corp.

16

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