8.1.3 Interleaved 4-Phase Operation
Two LM25119 devices can be designed for 4-phase operation with below configurations. The VCC shutdown and thermal shutdown on master device will shut down all four channels eventually by pulling down COMP bus. The VCC shutdown and thermal shutdown on slave device will only shut down the device under fault.
- To synchronize two devices and achieve phase shift, a 90 degree shifted clock should be applied to RT pins of master and slave devices
- Connect COMP pins of master and slave channels together.
- Connect FB pin of slave channel to local VCC pin.
- Connect RES pin to local VCC pin. This means hiccup model should be disabled.
- Connect all UVLO pins of master and slave channels together. This means the UVLO hysteresis current will be 4 times of 20-μA.