The LTC3716 is a 2-phase, VID programmable, synchronous step-down switching regulator controller that drives two N-channel external power MOSFET stages in a fixed frequency architecture. The 2-phase controller drives its two output stages out of phase at frequencies up to 300kHz to minimize the RMS ripple currents in both input and output capacitors. The 2-phase technique effectively multiplies the fundamental frequency by two, improving transient response while operating each channel at an optimum frequency for efficiency. Thermal design is also simplified. An operating mode select pin (FCB) can be used to regulate a secondary winding or select among three modes including Burst Mode TM operation for highest efficiency. An internal differential amplifier provides true remote sensing of the regulated supply’s positive and negative output terminals as required in high current applications. The RUN/SS pin provides soft-start and optional timed, short-circuit shutdown. Current foldback limits MOSFET dissipation during short-circuit conditions when the overcurrent latchoff is disabled. OPTI-LOOP compensation allows the transient response to be optimized for a wide range of output capacitors and ESR values.
The LTC3716 controller drives two external N‑channel MOSFETs in a dual‑phase architecture, providing antiphase operation up to 300 kHz to reduce ripple and improve transient response. It features a 5‑bit programmable VID, true remote‑sense differential amplifier, power‑good monitoring, and three operating modes (PWM, Burst, Cycle‑Skip).\n\nThe device includes a comprehensive pin‑out for flexible control, a wide input voltage range, and a compact 36‑lead SSOP package. Electrical characteristics such as output voltage accuracy (+1 %), programmable frequency (150 kHz‑300 kHz), and up to 30 A output current are detailed, along with typical performance graphs and a reference application for mobile CPU power supplies.
| Input Voltage Range | 4 V to 36 V |
|---|---|
| Fixed Frequency Range | 150 kHz to 300 kHz |
| Output Voltage Accuracy | +1 % |
| Maximum Output Current | 30 A |
| Package | 36‑Lead Plastic SSOP |
The controller can be programmed to operate between 150 kHz and 300 kHz.
It supports an input voltage from 4 V up to 36 V.
The device can deliver up to 30 A of output current.
Pin 10 (VpIEROUT) provides true remote‑sense output voltage.