Rev.03

2

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.

APPLICATIONS

‧

Cellular and Smart Phones

‧

Microprocessors and DSP Core Supplies

‧

Wireless and DSL Modems

‧

PDAs

‧

Portable Instruments / Media Players

‧

Digital Cameras

‧

PC Cards

FEATURES

‧

High Efficiency: Up to 96%

‧

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