SC2440 SEMTECH [Semtech Corporation], SC2440 Datasheet

SC2440

Manufacturer Part Number

SC2440

Description

2.5 MHz Dual Switching Regulator with Integrated 2A Switches

Manufacturer

SEMTECH [Semtech Corporation]

Datasheet

1.SC2440.pdf (26 pages)

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Current page: 1 of 26
Download datasheet (665Kb)

The SC2440 is an adjustable frequency dual current-

mode switching regulator with 2A integrated switches.

Its high frequency operation allows the use of small

inductors and capacitors, resulting in very compact power

supplies. 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.

Revision: March 5, 2007

POWER MANAGEMENT

Description

Typical Application Circuit

Figure 1. 1.3MHz 12V to 3.3V and 5V Step-down Converter

15.4K

24.3K

22nF

C10

22nF

10pF

470pF

220pF

15K

100K

SS1

ROSC

SS2

PGOOD1

COMP1

SYNC

COMP2

FB2

GND

SC2440

FB1

PGOOD2

BOOST1

BOOST2

SW1

SW2

L1: Sumida CR43

L2: F alco D04012

12V

VIN

0.1 F

100K

C15

10 F

0.1 F

UPS120

1N4148

4.4 H

3.3 H

1N4148

10 F

23.3K

10K

40.2K

10K

3.3V/2A

OUT2

OUT1

5V/2A

Features

Applications

2.5 MHz Dual Switching Regulator

Up to 2.5 MHz/Channel Programmable Switching

Frequency

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

XDSL and Cable Modems

Set-up Boxes

Point of Load Applications

CPE Equipment

DSP Power Supplies

Disk Drives

with Integrated 2A Switches

Efficiency vs Load Current

= 12V

0.5

Load Current (A)

OUT1

= 3.3V

OUT2

1.5

= 5V

www.semtech.com

SC2440

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