Rev.01

1

EP3003

2-CH, 600mA Synchronous Step-down Converter

DESCRIPTION

The EP3003 is a dual channel, 1.5MHz constant

frequency, slope compensated current mode PWM

step-down converter. The EP3003 can supply

600mA of load current from a 2.5V to 5.5V input

voltage. Each output voltage is adjustable from

0.6V to 5V. It is ideal for powering portable

equipment that runs from a single cell lithium-Ion

(Li+) battery. Internal synchronous 0.35Ω, 1A

power switches provide high efficiency without the

need for external Schottky diodes. The EP3003

can also run at 100% duty cycle for low dropout

operation, extending battery life in portable

system. Pulse Skipping Mode operation at light

loads provides very low output ripple voltage for

noise sensitive applications. Burst Mode operation

provides higher efficiency at light loads.

APPLICATIONS

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Cellular and Smart Phones

‧

Microprocessors and DSP Core Supplies

‧

Wireless and DSL Modems

‧

PDAs

‧

Portable Instruments / Media Players

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Digital Cameras

‧

PC Cards

FEATURES

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High Efficiency: Up to 96%

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1.5MHz Constant Switching Frequency

‧

600mA Output Current

‧

Integrated Main Switch and Synchronous

Rectifier

‧

High Switch Current: 1A on Each Channel

‧

2.5V to 5.5V Input Voltage Range

‧

Output Voltage as Low as 0.6V

‧

100% Duty Cycle in Dropout

‧

Low Quiescent Current: 50μA

Slope Compensated Current Mode Co

‧

ntrol for

Excellent Line and Load Transient Response

‧

Can be synchronized to an external oscillator

Short Circuit Protection

‧

‧

Power-on Reset Output

Thermal Fault Protection

‧

‧

<1uA Shutdown Current

‧

Small Thermally Enhanced 10-Pin MSOP and

3mm × 3mm DFN Packages

Typical Application

Figure 1. Basic Application Circuit for 2.5V and 1.8V Output Voltages