When you use one Li-ion battery to power a 3.3V DC/DC converter however, you encounter a problem, because the battery voltage. #Simple 6v battery guard circuit portable#The circuit is unique in that it boosts current with almost no compromise in performance, size, or cost Design by Wayne Rewinkel, National Semiconductor, Sunnyvale, CAģ.3V converter Delivers 3W from Li-Ion battery- 11/05/98 EDN-Design Ideas (Several circuits here, scroll to find this one) Lithium-ion batteries are rapidly gaining popularity in portable applications because of their superior energy density, low self-discharge rate, and high cell voltage. This design idea presents a simple, flexible, and inexpensive buck switcher that converts an input voltage as high as 60V to 5V at several amps. It first acts as an RF amplifier, with some of the signal being fed back to the antenna coil to provide some regeneration for better selectivity and sensitivity _ Designed by schematic and circuit description were provided Ronald Risselģ parts provide tenfold increase in switcher current- 08/22/02 EDN Design Ideas: Industrial-control circuits often derive their power from widely varying sources that can exceed the 40V maximum rating of popular switching ICs. You have to give the Japanese credit for even making a radio that can drive a speaker with only 2 transistors! Basically, the first transistor (Q1) performs double-duty. An internal LDO regulator draws_ Linear Technology/Analog Devices App Note, Sep 22, 2011Ģ-Phase Boost Converter Delivers 10W from a 3mm x 3mm DNF Package- DN354 Design Notes_ Linear Technology/Analog DevicesĢ-Transistor Amplifier- It has been interesting analyzing these radios. The LT3759 drives a low side external N-channel power MOSFET. It can be configured as a boost, SEPIC or inverting converter. _Ģ AA Cells replace 9V Battery Extend Operating Life- DN63 Design Notes_ Linear Technology/Analog DevicesĢ.5V to 36V Input, 12V/1A Output SEPIC Converter (Automotive 12V Regulator)- The LT3759 is a wide input range, current mode, DC/DC controller which is capable of regulating either positive or negative output voltages from a single feedback pin. Output voltage can be varied by adjusting the ratio of resistor values on the feedback pin. The circuit is built around the National Semiconductor LM2585, and uses the energy stored in an inductor to boost the 12v to 28. A nonsynchronous boost converter provide as a direct path from the input to th Design by Keith Szolusha, Linear Technology Corp, Milpitas, CAġ2V to 28V DC-DC Converter with LM2585- This boost regulator is for those times when you have a 28v relay, but want to use it with a 12v source. Links to electronic circuits, electronic schematics and designs for engineers, hobbyists, students & inventors:ġ Transistor Provides Short-Circuit Protection- 10/16/03 EDN Design Ideas: In certain DC/DC-converter applications, on-chip, cycle-by-cycle current limit may be insufficient protection to prevent a failure during a short circuit. Draws very low power - Ideal for battery-powered applications
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