eorex
Features
• High Efficiency: Up to 96%
• 1.5MHz Constant Switching Frequency
• 600mA Output Current at V
IN
= 3V
• 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
EP3001
1.5MHz, 600mA Synchronous Step-down Converter
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.
Applications
• Cellular and Smart Phones
• Microprocessors and DSP Core Supplies
• Wireless and DSL Modems
• PDAs
• MP3 Players
• Digital Still and Video Cameras
• Portable Instruments
Typical Application
Efficiency vs Output Current
100.00%
L1
3 2.2μH
90.00%
V
OUT
1.2V
C1
10μF
V
IN
C1
4.7μF
4
80.00%
70.00%
60.00%
50.00%
40.00%
30.00%
20.00%
10.00%
0.00%
0.1
1
10
100
1000
V
IN
SW
EP3001
1
EN
GND
2
V
OUT
5
Figure 1-Basic application circuit with EP3001 fixed output version
Jul. 2006
1/10
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