Analog Devices LTC3833EUDC | Demoboard DC1640A-A

Description

Demonstration circuit 1640A is a 1.5V/20A synchronous buck converter operating with a switching frequency of 300kHz over an input voltage range of 4.5V to 14V. The demo board comes in two versions. The A version usesinductor DCR current sensing with an iron powder inductor for high efficiency. The B version uses a 2mΩ /1% sense resistor for accurate current sensing with a low DCR ferrite inductor. The fixed on-time valley current mode topology of the LTC3833 allows for a fast load step response (seeFigures 4 and 5). The load step response can be tested with the onboard load step circuit and a bench pulse generator.Other features of the board include a MODE jumper to program either DCM or CCM with light or no load, a PLLIN input for synchronizing the converter to an external clock, a TRACK/SS pin, a PGOOD pin and an EXTVCC pin.The demo board uses a high density, two sided drop-in layout. The entire converter, excluding the bulk output and input capacitors, fits within a compact 1.4” × 0.6” area on the board. The package style for the LTC3833EUDC is a 3mm × 4mm 20-lead QFN with an exposed ground pad.

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