LM2705 Micropower Step-up DC/DC Converter with 150mA Peak Current Limit
August 2007
LM2705
Micropower Step-up DC/DC Converter with 150mA Peak
Current Limit
General Description
The LM2705 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 effi-
ciency 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 capac-
itors to minimize footprint and cost in space-conscious
portable applications. The LM2705 is ideal for LCD panels
requiring low current and high efficiency as well as white LED
applications for cellular phone back-lighting. The LM2705 can
drive up to 3 white LEDs from a single Li-Ion battery. The low
peak inductor current of the LM2705 makes it ideal for USB
applications.
Features
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150mA, 0.7鈩? internal switch
Uses small surface mount components
Adjustable output voltage up to 20V
2.2V to 7V input range
Input undervoltage lockout
0.01碌A 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
20039701
FIGURE 1. Typical 20V Application
漏 2007 National Semiconductor Corporation
200397
www.national.com
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