The MAX8529 dual, synchronized, step-down controller
generates two outputs from input supplies ranging from
4.75V to 23V. Each output is adjustable from sub-1V
to 18V. Input voltage ripple and total RMS input ripple
current are reduced by synchronized 180-degree out-of-phase
operation.
The switching frequency is adjustable from 600kHz to
1.5MHz with an external resistor. Alternatively, the controller
can be synchronized to an external clock generated
to another MAX8529 or a system clock. One
MAX8529 can be set to generate an in-phase, or 90-degree out-of-phase, clock signal for synchronization with additional controllers. This allows two controllers to operate either as an interleaved two- or four-phase system
with each output shifted by 90 degrees. These
devices also feature soft-start and soft-stop.
The MAX8529 eliminates the need for current-sense
resistors by utilizing the low-side MOSFET's on-resistance
as a current-sense element. This protects the
DC-to-DC components from damage during output
overload conditions or when output short circuit faults
without requiring a current-sense resistor. Adjustable
foldback current limit reduces power dissipation during
short-circuit conditions. The MAX8529 includes a
power-on reset output to signal the system when both
outputs reach regulation.
The MAX8529 is available in a 24-pin QSOP package. An
evaluation kit is available to speed designs.
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