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Programmable Frequency, 2A Output

30V Step-Down Switching Regulator

POWER MANAGEMENT

Description

The SC4524 is an adjustable frequency peak current-

mode step-down switching regulator with an integrated

2.3A, 30V switch. The SC4524 can be programmed up

to 1.5MHz. This allows the use of small inductor and

ceramic capacitors, resulting in very compact power

supplies. The SC4524 is suitable for next generation XDSL

modems, set-top boxes and point of load applications.

SC4524

Features

u

u

u

u

Up to 1.5 MHz Programmable Switching Frequency

2.3A Integrated Switch

Wide Input Voltage Range 2.8V to 30V

Peak Current-Mode Control with Cycle-by-Cycle

Current Limiting

Hiccup Overload Protection

Soft-Start and Enable

Thermal Shutdown

Thermally Enhanced 8-Pin SOIC Package

Fully WEEE and RoHS Compliant

u

u

u

The SC4524 uses peak current-mode PWM control for

ease of compensation. Cycle-by-cycle current limit and

u

hiccup overload protection reduce power dissipation

u

during overload. Combined soft start and enable pin not

only eliminates output start up overshoot but also allows

power sequencing.

The SC4524 is available in SOIC-8 EDP package.

Applications

u

u

u

u

u

u

XDSL and Cable Modems

Set-top Boxes

Point of Load Applications

CPE Equipment

DSP Power Supplies

Disk Drives

Typical Application Circuit

Efficiency

90

V IN

24V

85

IN

D1

SS

C7

22nF

BST

Efficiency (%)

C2

1N4148

0.1mF

L1

80

OUT

5V/2A

R1

22.1k

SC4524

COMP

SW

75

70

65

60

55

4.7mH

FB

C6

22pF

R5

15.4k

C5

470pF

ROSC

R3

17.4k

GND

C3

10mF

D2

20BQ030

C1

22mF

R2

5.49k

L1: Coiltronics FP3-4R7

C1: Murata GRM21BR60J226M

C3: Murata GRM32ER71H106K

50

0.0

0.5

1.0

1.5

2.0

Load Current (A)

Figure 1. 1MHz 24V to 5V/2A Step-down Converter.

Revision: December 30th, 2006

1

www.semtech.com

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