Analog Devices LTC3838EUHF-1 | Demoboard DC1997A-A

Description

Demonstration circuits DC1997A-A/DC1997A-B are dual output synchronous buck converters featuring the LTC®3838EUHF-1/LTC3838EUHF-2. Both assemblies provide two outputs of 1.5V/20A and 1.2V/20A over aninput voltage range of 4.5V to 14V at a switching frequency of 300kHz.Applications requiring the output to be adjusted with an external reference can be implemented with the DC1997A-B assembly. Such applications include adaptive voltage scaling optimization (AVSO) where the processor voltage is adjusted to achieve optimal efficiency, wide output voltageapplications controlled by a DAC, or margining. The 2nd channel of the DC1997A-B assembly is regulated to an onboard 1.2V reference in the default setup. The same reference can be set from 0.8V to 1.5V with a potentiometer or the 2nd channel can regulate to a source external to theboard. The 1st channel on the DC1997A-B assembly and both channels on the DC1997A-A version are regulated to the internal reference.The entire converter, excluding the bulk input and output capacitors, fits within a 1.5in2 area on the board. The high density is a result of the compact, 2-sided drop-in layout and the use of dual channel FETs.Additional features of this demo board include:• Remote sensing for each output.• PLLIN and CLKOUT pins.• PGOOD, RUN and TRK/SS pins for each output.• Optional resistors to tie the two outputs together.• Optional footprint for discrete single channel FETs forhigher output current.• Optional footprints to implement DTR (detect transient)to reduce overshoot following a load release.

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