This article introduces a 6mm × 6mm DC / DC controller for high current DCR sensing applications. The controller features temperature sensing and remote output voltage sensing, making it suitable for high current applications with input voltages up to 38V and output voltages up to 12.5V.
The LTC3855 is a versatile 2-phase synchronous buck controller IC designed for high current applications where cycle-by-cycle current is measured across the inductor (DCR sensing). It features on-chip drivers, remote output voltage sensing, and an inductor temperature sensing scheme to compensate for resistance changes as the component heats up. The device supports inputs up to 38V and outputs up to 12.5V.
| Input Voltage Range | up to 38V |
|---|---|
| Output Voltage Range | 0.6V to 12.5V |
| Switching Frequency Range | 250kHz to 770kHz |
| Minimum On-Time | 100ns |
| Full Load Efficiency | 86.7% |
| Peak Efficiency | 89.4% |
It uses DCR (DC Resistance) sensing across the inductor to measure cycle-by-cycle current.
The controller is suitable for inputs up to 38V.
The device features a minimum on-time of 100ns.