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Features
• Low Start-up Voltage: 1.0V
• 35μA Quiescent Supply Current in Switch-off
mode
• <1μA Shutdown Current
• 90% Efficiency
• Excellent Load and Line Regulation
Characteristics
• 350mΩ Internal MOSFET
• 450KHz Fixed Switching Frequency
• Small 6-Lead SOT-23 Package
EP4001
High Efficiency, Step-Up Converter with EXT
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.
Applications
• PDA
• DSC
• LCD Panel
• RF-Tags
• MP3
• Portable Equipment
• Wireless key board and mouse
Typical Application
R2
⎠
Where FB=1.22V
Figure 1-Basic application circuit with EP4001
V
OUT
= FB
×
⎜
1
+
⎛
⎝
R1
⎞
⎟
Aug. 2006
1/10
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