Active production — BOM-fit note
The LTC1700EMS#PBF: The part is a current-model boost controller from the LTC1700 family, designed for step-up DC-DC converter stages where synchronous rectification improves efficiency over a diode-based boost.
Switching frequency and control
Switching frequency is fixed at 530 kHz, with clock sync capability for noise-sensitive multi-rail systems. The 88% maximum duty cycle sets the practical step-up ratio — for a 3.3 V output from a 0.9 V input, the duty cycle stays within the 88 % ceiling. Control features include enable and soft start, allowing sequenced power-up and inrush limiting. The transistor-driver output drives an external MOSFET pair; the synchronous rectifier FET is driven internally, eliminating the need for a separate Schottky catch diode.
Operating supply range is 0.9 V to 6 V, covering single-cell alkaline, Li-Ion, or 5 V rails. Output configuration is positive, single-phase — a straightforward boost topology for generating a regulated higher-voltage rail from a lower input. The positive output eliminates the need for a level-shift circuit on the feedback node.
Supplied in tube; not on tape-and-reel, so pick-and-place feeders need tube-to-tape conversion or manual placement for prototyping.