SC4503 datasheet(1/22 Pages) SEMTECH

No. de pieza	SC4503

Descripción Electrónicos	1.3MHz Step-Up Switching Regulator with 1.4A Switch

PDF	22 Pages

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Fabricante Electrónico	SEMTECH [Semtech Corporation]

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POWER MANAGEMENT

SC4503

1.3MHz Step-Up Switching

Regulator with 1.4A Switch

The SC4503 is a 1.3MHz current-mode step-up switch-

ing regulator with an integrated 1.4A power transistor.

Its high switching frequency allows the use of tiny sur-

face-mount external passive components. The SC4503

features a combined shutdown and soft-start pin. The

optional soft-start function eliminates high input current

and output overshoot during start-up. The internal com-

pensation network accommodates a wide range of volt-

age conversion ratios. The internal switch is rated at 34V

making the device suitable for high voltage applications

such as Boost and SEPIC.

The SC4503 is available in low-proﬁle 5-lead TSOT-23 and

8-lead 2X2mm MLPD-W packages. The SC4503’s low

shutdown current (< 1μA), high frequency operation and

small size make it suitable for portable applications.

Low Saturation Voltage Switch: 260mV at 1.4A

1.3MHz Constant Switching Frequency

Peak Current-mode Control

Internal Compensation

Programmable Soft-Start

Input Voltage Range From 2.5V to 20V

Output Voltage up to 27V

Uses Small Inductors and Ceramic Capacitors

Low Shutdown Current (< 1μA)

Low Proﬁle 5-Lead TSOT-23 and 8-Lead 2X2mm

MLPD-W packages

Fully WEEE and RohS compliant

Local DC-DC Converters

TFT Bias Supplies

XDSL Power Supplies

Medical Equipment

Digital Cameras

Portable Devices

White LED Drivers

1

µF

C1

5V

VIN

VOUT

SC4503

3

1

5

2

GND

SHDN/SS

IN

SW

FB

4

ON

OFF

10BQ015

D1

L1

C2

4.7

µF

R2

49.9k

R1

432k

12V, 0.5A

4.7

µH

C4

15pF

Efficiency vs Load Current

50

55

60

65

70

75

80

85

90

95

0.001

0.010

0.100

1.000

Load Current (A)

VOUT = 12V

1.3MHz

www.semtech.com

1

May 4, 2007

Description

Features

Typical Application Circuit

Features

Typical Application Circuit

Applications

C1: Murata GRM188R61A105K

C2: Murata GRM21BR61C475K

L1: Sumida CDC5D23B-4R7

Figure 1(a). 5V to 12V Boost Converter

Figure 1(b). Efﬁciency of the 5V to 12V Boost Converter

Número de pieza similar - SC4503

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SC4503 Datasheet(PDF) 1 Page - Semtech Corporation

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