5V In 33W Univ 4-Bit VID I/F AVS Pwr Supply for TCI6636K2H/6638K2H Reference Design
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This reference design aims to supply the AVS core supply for Kepler DSPs like the C6638. The C66x series uses SmartReflex technology to enable the DSP to control its supply voltage. In order to meet this requirement, this design combines the TPS40303 Synchronous PWM Buck Controller with external CSD16325Q5 NexFETs, and a low-cost, four-transistor circuit to generate the required VID for the Core Supply AVS requirement. This solutions enables a universal 4-bi VID power supply for processors that need AVS implementation through 4-bit VID programming.


  • AVS Capability- dynamically adjust Vo through low-cost 4-bit discrete transistor circuit
  • <3% DC tolerance over full load, including LM10010 tolerance
  • 4.5V to 6V Input Voltage
  • 1V output at 25A  nominal current, 30A peak
  • 300KHz switching frequency
  • 89%  efficiency at 5V input, 1Vout at 25A

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Schematic/Block Diagram

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Design Files

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TI Devices (2)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
CSD16325Q5  25V, N ch NexFET MOSFETâ„¢, single SON5x6, 2.2mOhm  MOSFETs  Sample & Buy Not Available
TPS40303  3V to 20V Input, 25A Synchronous Buck Controller with FSS, 300kHz  Step-down (buck) regulators  Sample & Buy Not Available

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
CSD16325Q5 Download Download
TPS40303 Download Download

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Technical documentation

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User guide (1)
Title Type Size (KB) Date
PDF 341 26 Jun 2014
Design files (7)
Title Type Size (KB) Date
ZIP 74 27 Jun 2014
ZIP 302 27 Jun 2014
ZIP 75 26 Jun 2014
PDF 37 26 Jun 2014
PDF 78 26 Jun 2014
PDF 21 26 Jun 2014
PDF 54 26 Jun 2014

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