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Semtech SC2440A

2.5 MHz Dual Switching Regulator with Integrated 2A Switches

Overview

TopologyBuck Converter
Input voltage24 V
Switching frequency250-2500 kHz
Output 13.3 V / 1.8 A

Description

The SC2440 is an adjustable frequency dual currentmode switching regulator with 2A integrated switches. Its high frequency operation allows the use of small inductors and capacitors, resulting in very compact powersupplies. The SC2440 is suitable for next generation XDSL modems requiring operating frequencies in excess of 1.5 MHz. The two channels operate at 180° out of phase for reduced input voltage ripples. Separate soft start/shutdown pins allow independent control and output sequencing for latch-up prevention. The SC2440 can also be externally synchronized up to 2.5 MHz per channel.Current-mode PWM control allows fast transient response with simple loop compensation. Cycle-by-cycle current limiting and hiccup overload protection reduce power dissipation during overload.

Features

  • Up to 2.5 MHz/Channel Programmable SwitchingFrequency
  • Fixed Frequency Current-mode Control
  • Wide Input Voltage Range 2.8V to 20V
  • Out of Phase Switching Reduces Ripple
  • Cycle-by-cycle Current-limiting
  • Independent Shutdown/soft-start Pins
  • Independent Hiccup Overload Protection
  • Independent Power-Good Indicators
  • Two 2A Integrated Switches
  • External Synchronization
  • Thermal Shutdown
  • Thermally Enhanced 16-pin TSSOP Package

Typical applications

  • Point of Load Applications
  • DSP Power Supplies
  • Disk Drives
  • Set-up Boxes
  • XDSL and Cable Modems

Products

Order Code Data­sheet Downloads Product seriesL
(µH)
IR
(A)
ISAT
(A)
RDC typ.
(mΩ)
RDC max.
(mΩ)
fres
(MHz)
SizeVersion Samples
744777910
IGS STP ALT EAG CAD LTS PSP SPE CADWE-PD SMT Power Inductor 10 2 2.6 45 49 26 7345 Robust
Order Code Data­sheet
744777910
Samples
Order Code Data­sheet Downloads Product seriesL
(µH)
IR
(A)
ISAT
(A)
RDC typ.
(mΩ)
RDC max.
(mΩ)
fres
(MHz)
SizeVersion Samples