The LTC3853 is a versatile 3-phase synchronous buck controller with on-chip drivers in a 6mm × 6mm QFN package.
The LTC3853 is a DC/DC controller designed to regulate three outputs or combine two channels for higher current. It features independent operation for each channel, allowing outputs from 0.8V to 13.2V on the third channel and 0.8V to 5V on the first two.
The device supports multiphase operation with automatic phase optimization to reduce output ripple. It offers three operating modes under light load conditions: Burst Mode, Forced Continuous Mode, and Pulse-skipping mode, providing flexibility for efficiency and ripple requirements.
| Package Type | 6mm x 6mm QFN |
|---|---|
| Number of Channels | 3-phase |
| Channel 1 & 2 Output Range | 0.8V to 5V |
| Channel 3 Output Range | 0.8V to 13.2V |
| Switching Frequency (Free-running) | 500kHz |
Yes, two of the channels can be combined for twice the current with their relative operating phase automatically optimized.
The device can regulate outputs from inputs ranging up to 24V.
The controller features a minimum on-time of less than 90 nanoseconds.
Setting the FREQ pin to 1.2V corresponds to a free-running frequency of 500kHz.