The LTC3717 is a synchronous step-down switching regulator controller from Texas Instruments for DDR and QDR memory termination. 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. Forced continuous operation reduces noise and RF interference. Output voltage is internally set to half of VREF, which is user programmable. Fault protection is provided by an output overvoltage comparator and optional short-circuit shutdown timer. Soft-start capability for supply sequencing is accomplished by internally compensating VIN's variation with switching frequency.
The LTC3717 is a synchronous step‑down switching controller designed for DDR/QDR memory termination and other high‑efficiency applications. It operates without a sense resistor, offers up to 97 % efficiency, and features true current‑mode control with programmable voltage thresholds.
The document includes absolute maximum ratings, detailed electrical characteristics, pin descriptions, typical performance curves, package dimensions, and example application circuits, helping designers integrate the part into power‑management designs.
| Input Supply Voltage (Vee) | 4 V to 36 V |
|---|---|
| Output Overvoltage Fault Threshold | 8 % to 12 % |
The LTC3717 operates from 4 V up to 36 V.
It is supplied in a 16‑lead narrow SSOP package.