EP4001_15 Datasheet, PDF (6/10 Pages) Eorex Corporation – High Efficiency, Step-Up Converter with EXT

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Functional Block Diagram
EP4001
Figure 3-EP4001 Functional Block Diagram
Operation
The EP4001 is a current mode PWM boost converter with a fixed switching frequency at 450KHz. It is
able to operate from an input voltage below 1V. With its low R_DS(ON) internal MOSFET switch, this device
maintains the high efficiency over a wide range of load current.
Low Voltage Start-Up
The EP4001 will start up with a typical V_IN voltage at 1V. The low voltage start-up circuitry controls the
internal NMOS switch allowing the devices to start up into an output load. Once V_OUT exceeds 1.8V, the
start-up circuitry is disabled and normal fixed frequency PWM operation is initiated. In this mode, the
EP4001 operates independent of V_IN. The limiting factor for the application becomes the ability of the
battery to supply sufficient energy to the output. Low Noise Fixed Frequency Operation Oscillator: The
frequency of operation is internally set to 450KHz.
Aug. 2006
www.eorex.com
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