The LTC3778 is a synchronous step-down switching regulator controller for computer memory, automobile and other DC/DC power supplies. The controller uses a valley current control architecture to deliver very low duty cycles without requiring a sense resistor. Operating frequency is selected by an external resistor and is compensated for variations in VIN and VOUT. Discontinuous mode operation provides high efficiency operation at light loads. A forced continuous control pin reduces noise and RF interference, and can assist secondary winding regulation when the main output is lightly loaded. SENSE+ and SENSE– pins provide true Kelvin sensing across the optional sense resistor or the sychronous MOSFET. Fault protection includes overcurrent protection, overvoltage protection, thermal shutdown and short-circuit protection.
The LTC3778 is a synchronous step‑down switching regulator controller designed for computer memory, automobile and other DC/DC power supplies. It operates over a wide input range (4 V‑36 V) and provides a low‑voltage output (0.6 V‑0.9 V) with optional sense‑resistor operation and a 200 kHz switching frequency.
The document includes features, absolute maximum ratings, electrical characteristics, pin functions, package dimensions, typical performance graphs, and a typical application circuit. It is intended for designers needing detailed specifications and layout guidance.
| Input Voltage Range | 4 V to 36 V |
|---|---|
| Output Voltage Range | 0.6 V to 0.9 V |
| Switching Frequency | 200 kHz |
| Package | 20‑Lead Plastic TSSOP |
| Current Sense Threshold (Vang) | 1 V |
| Shutdown Supply Current | 15 pA |
The device operates from 4 V up to 36 V on its input.
It is supplied in a 20‑lead plastic TSSOP package.
The controller is typically set to operate at 200 kHz.