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EP4001

High Efficiency, Step-Up Converter with EXT

Features Description

The EP4001 is a micropower, high efficiency, and low voltage step-up DC/DC converter intended for use in battery powered wireless applications. With the low start-up input voltage below 1V, the device is suitable for applications with 1 or 2 AA cells, providing up to 300mA output current at 3.3V output. The 35µA low quiescent current, zero shutdown current and high efficiency maintains long battery lifetime. A switching frequency of 450KHz minimizes solution footprint by allowing the use of small inductors and ceramic capacitors. The device is offered in a low profile (1mm) small 6-lead SOT-23 package. The current mode PWM design is optimized for stable and high efficiency operations over a wide range of load currents. With low resistance internal MOSFET switches, the EP4001 maintains high efficiency over a wide range of load current. In addition to its high efficiency at moderate and heavy loads, the EP4001 includes automatic PFM operation that improves efficiency of the power converter at light loads. • Low Start-up Voltage: 1.0V • 35A Quiescent Supply Current in Switch-off mode • <1A Shutdown Current • 90% Efficiency • Excellent Load and Line Regulation Characteristics • 350m Internal MOSFET • 450KHz Fixed Switching Frequency • Small 6-Lead SOT-23 Package

Applications

• PDA • DSC • LCD Panel • RF-Tags • MP3 • Portable Equipment • Wireless key board and mouse

Typical Application

V
OUT = FB Where FB=1.22V
R2R11 Figure 1-Basic application circuit with EP4001
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