It is strongly recommended to have at least one fixed 5-V rail and connect the
5 V output to the VCCX pin.
If battery monitor is required, configure CH1 buck.
If 3.3-V rail is required, program the VOUT3 to the fixed 3.3 V and utilize
the VDDX function.
SEPIC configuration is good when the load current is less than about 3 - 4 A.
In the SEPIC configuration, the maximum input
voltage has to be limited below 42 V -
VVOUT1 since the SW node voltage is
VSUPPLY plus VLOAD in the
SEPIC configuration and switching noise should be
considered.
The maximum load current of the single buck channel can be up to about 20 A with proper thermal management.
The maximum load current of the dual-phase buck can be up to about 40 A with proper thermal management.
Cascaded configuration is allowed.
The BIAS pin should be connected to the highest voltage rail in the system
because the internal charge pump creates BIAS + 5
V rail for HB1. Especially, the BIAS pin should be
connected to the output of the boost converter in
boost configuration.
Populate 100 pF CSS if CH1 is used as a pre-boost.
The CH2 buck input voltage can be higher or lower than the CH3 buck input voltage, but the BIAS pin should be always connected to the highest potential input voltage.