The LTC3866 is a reliable current mode switching power supply controller with <0.5mΩ current sensing resistance, enabling high efficiency. It is suitable for high current applications and features a wide input range, remote output voltage sensing, programmable temperature-compensated current limit, short-circuit soft recovery, and more.
The document details the LTC3866 synchronous buck controller, which utilizes a unique architecture to enhance the signal-to-noise ratio of current sense signals. This allows the use of very low DC resistance (DCR) power inductors or low-value current sensing resistors to maximize efficiency in high-current applications while minimizing switching jitter.
Key features include a wide 4.5V-38V input range, remote output voltage sensing with an accurate 0.5% reference, programmable current limiting via the ILIM pin, and temperature-compensated current limit when using inductor DCR sensing. The controller also offers short-circuit soft recovery without overshoot and chip thermal shutdown protection.
| Output Voltage Range | 0.6V to 3.5V |
|---|---|
| Package Type | 24-lead QFN and exposed pad QFN |
The LTC3866 can sense an inductor DCR value as low as 0.2mΩ with careful PCB layout.
The part provides an accurate output voltage from 0.6V to 3.5V.
The worst case switching node jitter is reduced by 60% when using a very low 0.32mΩ inductor DCR.