Replacing rectifying boost diodes with higher efficiency N-channel MOSFETs, the LTC3784 two-phase, single-output synchronous step-up dc/dc controller delivers a 24V output at 10A from a 12V input at efficiency up to 97% without a heat sink. It operates on input voltages from 4.5V to 60V during start-up, maintains operation down to 2.3 Vin after start-up, and can regulate output voltages up to 60V. The LTC3784 employs a phase-lockable switching frequency from 75 kHz to 850 kHz or a selectable fixed frequency from 50 kHz to 900 kHz. In addition, the device features adjustable cycle-by-cycle current limit and can use a sense resistor or the voltage drop across the inductor (DCR) for current sensing. Available in SSOP-28 and 4 mm x 5 mm QFN-28 packages, price starts at $3.76 each/1,000. For a datasheet, go to http://cds.linear.com/docs/en/datasheet/3784f.pdf.
Linear Technology Corp.
Milpitas, CA.
800-454-6327
http://www.linear.com
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