DC1297B

LTM4612 DC to DC Converter and Switching Regulator Chip 3.234VDC to 3.366VDC/4.9VDC to 5.1VDC/11.76VDC to 12.24VDC Output Demonstration Circuit

The demonstration board features the LTM4612EV DC to DC µModule regulator. The LTM4612EV is a EN55022 class B certified high voltage input and output, 5A switching mode DC to DC power supply. Included in the IC package are the switching controller, power FETs, inductor and all support components. High switching frequency and an adaptive ontime current mode architecture enables a very fast transient response to line and load changes without sacrificing stability. The demonstration board accepts an input voltage from 5V to 36V and delivers a jumper programmable output voltage of 3.3V, 5V or 12V. The rated load current is 5A for 3.3V/5V, 3A for 12V VOUT. Current derating is necessary for certain VIN, VOUT and thermal conditions. The DC1297B supports programming of the output ramp up and ramp down through the TRACK/SS pin. The output may be set to coincidentally or ratiometrically track to another voltage rail.

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Default operating frequency of 850KHz for VOUT = 12V, 350KHz for VOUT = 5V, 235KHz for VOUT = 3.3V

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90.1% efficiency

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Low input and output referred noise

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Output voltage tracking and margining

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Power good tracks with margining

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PLL frequency synchronization

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±1.5% set point accuracy

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Current foldback protection disabled at start up

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Parallel/current sharing

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Programmable soft start