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Semtech SC4524B

18V 2A Step-Down Switching Regulator

Overview

TopologyBuck Converter
Input voltage10-16 V
Switching frequency200-2000 kHz
Output 15 V / 2 A

Description

The SC4524B 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 SC4524B is programmable up to 2MHz, allowing the use of small inductors andceramic capacitors for miniaturization, and high input/ output conversion ratio. The SC4524B is suitable for next generation XDSL modems, high-definition TVs and various point of load applications.Peak current-mode PWM control employed in the SC4524B achieves fast transient response with simple loop compensation. Cycle-by-cycle current limiting and hiccup overload protection reduces power dissipation duringoutput overload. Soft-start function reduces input startup current and prevents the output from overshooting during power-up.The SC4524B is available in SOIC-8 EDP package.

Features

  • 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 compliantREMARKS:-Table 4.Recommended Inductance and compensator

Typical applications

  • Set Top Boxes
  • XDSL and Cable Modems
  • CPE Equipment
  • LCD and Plasma TVs
  • DSP Power Supplies

Products

Order Code Data­sheet Downloads Product seriesL
(µH)
IR
(A)
ISAT
(A)
RDC typ.
(mΩ)
RDC max.
(mΩ)
fres
(MHz)
SizeVersion Samples
7447789006
IGS STP ALT EAG CAD LTS PSP SPE CADWE-PD SMT Power Inductor 6.8 2.5 2.75 42 44 38 7332 Robust
Order Code Data­sheet
7447789006
Samples
Order Code Data­sheet Downloads Product seriesL
(µH)
IR
(A)
ISAT
(A)
RDC typ.
(mΩ)
RDC max.
(mΩ)
fres
(MHz)
SizeVersion Samples