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LM2704-ADJMWC Arkusz danych(PDF) 1 Page - National Semiconductor (TI) |
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LM2704-ADJMWC Arkusz danych(HTML) 1 Page - National Semiconductor (TI) |
1 / 11 page LM2704 Micropower Step-up DC/DC Converter with 550mA Peak Current Limit General Description The LM2704 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 LM2704 is ideal for LCD panels requiring low current and high efficiency as well as white LED applications for cellular phone back-lighting. The LM2704 can drive up to 8 white LEDs from a single Li-Ion battery. Features n 550mA, 0.7 Ω, internal switch n Uses small surface mount components n Adjustable output voltage up to 20V n 2.2V to 7V input range n Input undervoltage lockout n 0.01µA shutdown current n Small 5-Lead SOT-23 package Applications n LCD Bias Supplies n White LED Back-Lighting n Handheld Devices n Digital Cameras n Portable Applications Typical Application Circuit 20031501 FIGURE 1. Typical 20V Application April 2003 © 2003 National Semiconductor Corporation DS200315 www.national.com |
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