The LTC3711 is a synchronous step-down switching regulator controller for CPU power. An output voltage between 0.925V and 2.000V is selected by a 5-bit code (Intel mobile VID specification). 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 by disabling discontinuous mode operation when the main output is lightly loaded.
The LTC3711 is a synchronous step‑down switching regulator controller designed for CPU power supplies. It provides an adjustable output voltage from 0.925 V to 2.000 V selected by a 5‑bit code and operates over a wide input range of 4 V to 36 V without requiring an external sense resistor.
The device includes features such as true current‑mode control, programmable soft‑start, output over‑voltage protection, and a micropower shutdown current of less than 30 pA. Detailed electrical characteristics, pin functions, and typical performance graphs are provided for design reference.
| Input Voltage Range | 4 V to 36 V |
|---|---|
| Output Voltage Range | 0.925 V to 2.000 V |
| Duty Cycle at 200 kHz | 2 % to 90 % |
| Micropower Shutdown Current | < 30 pA |
| Package | 24‑Lead Narrow SSOP |
The LTC3711 can be programmed to output voltages from 0.925 V to 2.000 V.
It operates with an input supply voltage between 4 V and 36 V.
No, the LTC3711 is a No‑Rsense step‑down controller and does not need a sense resistor.
The micropower shutdown current is less than 30 pA.