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.