DESCRIPTION
Demonstration circuit 3230A features the LTM®4652, a
high efficiency, bidirectional dual-phase μModule® regulator
configured as a single 32A, –5V output. The input
voltage range is from 4.5V to 13V. For this inverting output
demo board, the maximum VIN + |VOUT| should not
exceed 18V. Derating is necessary for certain VIN, VOUT,
frequency and thermal conditions.
This demo board can be configured to source or sink
output load current. Hardware test setup diagrams for
both conditions are described in later sections. This
demo board is optimized using a default frequency of
780kHz under the 9VIN and –5VOUT condition. The current
mode architecture used in LTM4652 is peak current
mode control.
The part operates in continuous current mode by default
but can be placed in pulse-skipping mode to optimize
efficiency at light loads.
LTM4652 is available in a thermally enhanced 144-lead
(16mm × 16mm × 4.92mm) BGA package. Temperature
sensing options are included via onboard circuit. The
module package features an exposed metal top, electrically
unconnected for heatsinking capability.
Note that the inverting configuration of LTM4652 has a
different maximum current limit compared to the noninverting
configuration. The LTM4652 data sheet gives
a complete description of the operation and application
information. It is recommended to read the data sheet
and demo manual of LTM4652 prior to use or making
any hardware changes to DC3230A.