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3I13N-Rev.P001

2.4A/32V Synchronous Rectified

Step-Down Converter

EC3278

General Description

The EC3278 is a monolithic synchronous buck regulator.

The device integrates two 90m

Ω MOSFETs, and provides

2.4A of continuous load current over a wide input voltage

of 4.75V to 32V. Current mode control provides fast

transient response and cycle-by-cycle current limit.

An adjustable soft-start prevents inrush current at turn-on,

and in shutdown mode the supply current drops to 1µA.

This

device,

available in

an

SOP-8(Exposed PAD)

package, provides a very compact solution with minimal

external components.

Features

•

2.4A Output Current

•

Wide 4.75V to 32V Operating Input Range

•

Integrated 90m

Ω Power MOSFET Switches

•

Output Adjustable from 0.923V to 30V

•

Up to 93% Efficiency

•

Programmable Soft-Start

•

Stable with Low ESR Ceramic Output Capacitors

•

Fixed 200KHz

Frequency

•

Cycle-by-Cycle Over Current Protection

•

Input Under Voltage Lockout

Applications

•

Distributed Power Systems

•

Networking Systems

•

FPGA, DSP, ASIC Power Supplies

•

Green Electronics/ Appliances

•

Notebook Computers

Typical Application Circuit

Fig1. EC3278 with 5V Output, 470µF/16V Electrolytic Output Capacitor