The LTC3802 is a dual switching regulator controller optimized for high efficiency step-down conversion from input voltages between 3V to 30V. The controller uses a leading edge modulation scheme to allow extremely low duty cycle operation. The constant frequency voltage mode controller allows a phase-lockable frequency between 330kHz and 750kHz. Power loss and noise due to the ESR of the input capacitors are minimized by operating the two controller output stages 180° out-of-phase.
The LTC3802 is a dual‑phase synchronous DC/DC controller that operates from 3 V to 30 V input and supports a programmable up/down tracking scheme. It features a phase‑lockable fixed‑frequency oscillator (330 kHz‑750 kHz) and an optional burst‑mode operation for light‑load efficiency.
The device is offered in a 32‑lead plastic QFN package (5 mm × 5 mm) and includes detailed pin‑out information, electrical characteristics, and typical application circuits. The datasheet also lists absolute maximum ratings, supply current limits, and performance graphs for efficiency, load regulation, and switching frequency versus temperature.
| Input Voltage Range | 3 V – 30 V |
|---|---|
| Oscillator Frequency (Phase‑Lockable) | 330 kHz – 750 kHz |
| Voltage Reference | 0.6 V (±1 %) |
| Operating Temperature Range | -40 °C to 85 °C |
| No‑Load Supply Current | 2 mA typ |
| Package | 32‑Lead Plastic QFN (5 mm × 5 mm) |
The LTC3802 operates from 3 V up to 30 V input.
The controller can be set to a fixed frequency between 330 kHz and 750 kHz, which can be phase‑locked to an external source.
The device is offered in a 32‑lead plastic QFN package measuring 5 mm × 5 mm.
Duty cycle is programmed via the Fast Programmable Power‑Up/‑Down Tracking pins and an external resistor on the Imaxi pin.