The document introduces the LTC3854 power controller, which uses a 2mm x 3mm DFN package, integrates FET drivers, DCR sensing and up to 38V input voltage.
The LTC3854 is a current mode controller designed to produce output voltages ranging from 0.8V to 5.5V over an input voltage range of 4.5V to 38V. It features integrated N-channel FET gate drivers and supports both sense resistor and DCR (DC resistance) sensing methods for current detection.
The device is optimized for space-constrained applications, available in a 2mm x 3mm DFN or MSE package. Key design features include a fixed frequency peak current mode topology with cycle-by-cycle current limiting, a maximum duty cycle of 97%, and a built-in 5V linear regulator for bias.
| Output Voltage Range | 0.8V to 5.5V |
|---|---|
| Input Voltage Range | 4.5V to 38V |
| Switching Frequency | 400kHz |
| Package Dimensions | 2mm x 3mm |
| Maximum Duty Cycle | 97% |
DCR sensing offers improved efficiency by eliminating power losses in a sense resistor, results in lower parts count, and reduces cost.
Due to its wide input voltage range, it can be used in automotive, industrial, and communications applications.