eorex

EP3001

Jul. 2006

www.eorex.com

1/10

1.5MHz, 600mA Synchronous Step-down Converter

Features

• High Efficiency: Up to 96%

• 1.5MHz Constant Switching Frequency

• Integrated Main Switch and Synchronous

Rectifier

• No Schottky Diode Required

• 2.5V to 5.5V Input Voltage Range

• Output Voltage as Low as 0.6V

• 100% Duty Cycle in Low Dropout Operation

• Low Quiescent Current: 300µA

• Slope Compensated Current Mode Control for

Excellent Line and Load Transient Response

• Short Circuit Protection

• Thermal Fault Protection, <1uA Shutdown

Current

• Space Saving 5-Pin Thin SOT23 package

Applications

• Cellular and Smart Phones

• Microprocessors and DSP Core Supplies

• Wireless and DSL Modems

• PDAs

• MP3 Players

• Digital Still and Video Cameras

• Portable Instruments

Description

The EP3001 is a 1.5MHz, constant frequency,

slope

compensated

current

mode

PWM

step-down converter. The device integrates a

main switch and a synchronous rectifier for high

efficiency without an external Schottky diode. It is

ideal for powering portable equipment that runs

from a single cell lithium-Ion (Li+) battery.

The EP3001 can supply 600mA of load current

from a 2.5V to 5.5V input voltage. The output

voltage can be regulated as low as 0.6V. The

EP3001 can also run at 100% duty cycle for low

dropout operation, extending battery life in

portable system. Idle mode operation at light

loads provides very low output ripple voltage for

noise sensitive applications.

The EP3001is offered in a low profile (1mm) 5-pin,

thin SOT package, and is available in an

adjustable version and fixed output voltage of

1.2V, 1.5V and 1.8V.

Typical Application

10μF

SW

GND

1.2V

EN

C1

4.7μF

C1

EP3001

L1

2.2μH

1

2

3

4

5

100.00%

90.00%

80.00%

70.00%

60.00%

50.00%

40.00%

30.00%

20.00%

10.00%

0.00%

0.1

1

10

100

1000

Efficiency vs Output Current

Figure 1-Basic application circuit with EP3001 fixed output version