LM2703 Micropower Step-up DC/DC Converter with 350mA Peak Current Limit
April 2003
LM2703
Micropower Step-up DC/DC Converter with 350mA Peak
Current Limit
General Description
The LM2703 is a micropower step-up DC/DC in a small
5-lead SOT-23 package. A current limited, fixed off-time
control scheme conserves operating current resulting in high
efficiency over a wide range of load conditions. The 21V
switch allows for output voltages as high as 20V. The low
400ns off-time permits the use of tiny, low profile inductors
and capacitors to minimize footprint and cost in space-
conscious portable applications. The LM2703 is ideal for
LCD panels requiring low current and high efficiency as well
as white LED applications for cellular phone back-lighting.
The LM2703 can drive up to 4 white LEDs from a single
Li-Ion battery.
Features
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350mA, 0.7Ω, internal switch
Uses small surface mount components
Adjustable output voltage up to 20V
2.2V to 7V input range
Input undervoltage lockout
0.01µA shutdown current
Small 5-Lead SOT-23 package
Applications
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LCD Bias Supplies
White LED Back-Lighting
Handheld Devices
Digital Cameras
Portable Applications
Typical Application Circuit
20030601
FIGURE 1. Typical 20V Application
© 2003 National Semiconductor Corporation
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