sc4524d Semtech Corporation, sc4524d Datasheet

sc4524d

Manufacturer Part Number

sc4524d

Description

18v 2a Step-down Switching Regulator

Manufacturer

Semtech Corporation

Datasheet

1.SC4524D.pdf (21 pages)

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POWER MANAGEMENT

Features



Applications



Typical Application Circuit

Dec. 9, 2010

Wide input range: 3V to 18V

2A Output Current

200kHz to 2MHz Programmable Frequency

Precision 1V Feedback Voltage

Peak Current-Mode Control

Cycle-by-Cycle Current Limiting

Hiccup Overload Protection with Frequency Foldback

Soft-Start and Enable

Thermal Shutdown

Thermally Enhanced 8-pin SOIC Package

Fully RoHS and WEEE compliant

XDSL and Cable Modems

Set Top Boxes

Point of Load Applications

CPE Equipment

DSP Power Supplies

LCD and Plasma TVs

10nF

2.2 F

10V – 16V

L1: Wurth 744 778 9006

10pF

SS/EN

COMP

30.1k

1nF

SC4524D

ROSC

15.8k

GND

Figure 1. 1MHz 10V-16V to 5V/2A Step-down Converter

BST

C2: Murata GRM31CR60J226K

C4: Murata GRM31CR61E225K

0.33 F

20BQ030

6.8 H

1N4148

18V 2A Step-Down Switching Regulator

102k

25.5k

22 F

5V/2A

OUT

SS270 REV 4

Description

The SC4524D is a constant frequency peak current-mode

step-down switching regulator capable of producing 2A

output current from an input ranging from 3V to 18V. The

switching frequency of the SC4524D is programmable

up to 2MHz, allowing the use of small inductors and

ceramic capacitors for miniaturization, and high input/

output conversion ratio. The SC4524D is suitable for

next generation XDSL modems, high-definition TVs and

various point of load applications.

Peak current-mode PWM control employed in the

SC4524D achieves fast transient response with simple loop

compensation. Cycle-by-cycle current limiting and hiccup

overload protection reduces power dissipation during

output overload. Soft-start function reduces input start-

up current and prevents the output from overshooting

during power-up.

The SC4524D is available in SOIC-8 EDP package.

0.5

Load Current (A)

Efficiency

SC4524D

1.5

= 12V

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