DC1839A

LINEAR TECHNOLOGY DC1839A Demonstration Board for 15V Dual 3A Monolithic Step-Down Regulator Board for DDR Power

The is a demonstration board based on LTC3634 monolithic synchronous buck regulator. The LTC3634 is a high efficiency, dual channel monolithic synchronous step down regulator which provides power supply and bus termination rails for DDR1, DDR2 and DDR3 SDRAM controllers. The DC1839A has an input voltage range of 3.6V to 15V. The output voltage of the first channel VDDQ of board has three fixed voltage settings, 1.5V, 1.8V, 2.5V and is capable of delivering up to 3A of output current. The second channel VTT is set to regulate to half the voltage on the VDDQIN pin, which can be either the channel 1 output or an external reference voltage. It can source or sink a maximum of 3A. With the use of a timing resistor, DC1839A can have its operating frequency programmed from 500KHz to 4MHz or DC1839A can be easily synchronized to an external clock, due to an internal phase locked loop. The board VDDQ output can operate in either burst mode operation or forced continuous mode.

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Nominal switching frequency of 1MHz

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Current mode operation for excellent line and load transient response

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External clock synchronization

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Short circuit protected

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Input overvoltage and overtemperature protection

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Power good status outputs