'Switch-Mode' related articles 1

  1. 2009/01/08 MC34716 - 1.0 MHz Dual Switch-Mode DDR Power Supply
The 34716 is a highly integrated, space-efficient, low cost, dual synchronous buck switching regulator with integrated N-channel power MOSFETs. It is a high performance point-of-load (PoL) power supply with its second output having the ability to track an external reference voltage. it provides a full power supply solution for Double-Data-Rate (DDR) Memories.
Channel one provides a source only, 5.0 A drive capability, while channel two can sink and source up to 3.0 A. Both channels are highly efficient with tight output regulation. With its high current drive capability, channel one can be used to supply the VDDQ to the memory chipset. The second channel’s ability to track a reference voltage makes it ideal to provide the termination voltage (VTT) for modern data buses. The 34716 also provides a buffered output reference voltage (VREFOUT) to the memory chipset The 34716 offers the designer the flexibility of many control, supervisory, and protection functions to allow for easy implementation of complex designs. It is housed in a Pb-free, thermally enhanced, and space efficient 26-Pin Exposed Pad QFN.

*50 mΩ integrated N-channel power MOSFETs
*Input voltage operating range from 3.0 to 6.0 V
*±1% accurate output voltages, ranging from 0.7 to 3.6 V
*The second output tracks 1/2 an external reference voltage
*±1% accurate buffered reference output voltage
*Programmable switching frequency range from 200 kHz to 1.0 MHz
*Programmable soft start timing for channel one
*Over-current limit and short-circuit protection on both channels
*Thermal shutdown
*Output over-voltage and under-voltage detection
*Active low power good output signal
*Active low standby and shutdown inputs
*Pb-free packaging designated by suffix code EP.


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