The LT3800 is a high-voltage synchronous current mode step-down controller with a fixed frequency of 200kHz. It can drive standard gate N-channel power MOSFETs and operate with input voltages from 4V to 60V.
The LT3800 controller provides a fixed‑frequency (200 kHz) current‑mode step‑down solution for input voltages from 4 V to 60 V and output voltages up to 36 V. It drives standard N‑channel MOSFETs and includes features such as Burst Mode, reverse‑current inhibit, and programmable soft‑start to improve efficiency at light loads.
The device is supplied in a 16‑lead thermally‑enhanced TSSOP package and offers specifications such as 1 % regulation accuracy, 100 µA no‑load quiescent current, and a low‑shutdown current of less than 10 µA. Detailed pin functions, electrical characteristics, and typical application circuits are provided.
| Input Voltage Range | 4 V to 60 V |
|---|---|
| Output Voltage Range | up to 36 V |
| Operating Frequency | 200 kHz |
| No‑Load Quiescent Current | 100 µA |
| Shutdown Current | <10 µA |
| Regulation Accuracy | 1 % |
| Package | 16‑lead thermally enhanced TSSOP |
The LT3800 operates from 4 V up to 60 V input.
The controller runs at a fixed 200 kHz frequency.
It draws about 100 µA in no‑load condition.
It is supplied in a 16‑lead thermally enhanced TSSOP package.