The LTC3401 is a high-efficiency, fixed-frequency, step-up DC/DC converter that operates from an input voltage below 1V. The device includes a 0.16Ω N-channel MOSFET switch and a 0.18Ω P-channel synchronous rectifier. Switching frequencies up to 3MHz are programmed with an external timing resistor and the oscillator can be synchronized to an external clock. An external Schottky diode is optional but will slightly improve efficiency. Quiescent current is only 38µA in Burst Mode operation, maximizing battery life in portable applications. Burst Mode operation is user controlled and can be enabled by driving the MODE/SYNC pin high. If the MODE/SYNC pin has either a clock or is driven low, then fixed frequency switching is enabled. Other features include 1µA shutdown, antiringing control, open-drain power good output, thermal shutdown and current limit. The LTC3401 is available in the 10-lead thermally enhanced MSOP package. Higher current applications should use the 2A rated LTC3402 synchronous boost converter. Applications that require VOUT < 2.6V should use the LTC3423. All-Ceramic-Capacitor 2-Cell to 3.3V at 500mA Step-Up Converter.
The LTC3401 is a high‑efficiency, fixed‑frequency step‑up DC/DC converter designed for low‑voltage input operation down to 0.5 V. It features synchronous rectification with up to 97 % efficiency, a 1 A switch current rating, and a 10‑pin MSOP package.
The document provides detailed electrical characteristics, absolute maximum ratings, pin descriptions, typical application circuits, and a list of related parts. It also includes package dimensions and recommended layout guidelines for PCB designers.
| Input Voltage Range | 0.5 V to 5.5 V |
|---|---|
| Adjustable Output Voltage | 2.6 V to 5.5 V |
| Switch Current Rating | 1 A |
| Quiescent Current (Burst Mode) | 38 µA |
| Shutdown Current | <1 pA |
| Maximum Switching Frequency | Up to 3 MHz |
| Efficiency | Up to 97 % |
| Package | 10‑lead MSOP |
The device can operate at a fixed frequency up to 3 MHz.
The LTC3401 is supplied in a 10‑pin MSOP package.
The shutdown current is less than 1 pA.