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Power Conversion Solutions
for powering next generation microprocessors
January 1997
A New Approach from IR
* Pentium(R) level microprocessors have created new requirements for high performance and cost-effective power conversion * Output voltages dropping to 3.3V and lower...increasing output currents over 10A...fast transient responses greater than 30A/sec...all placing new demands for efficient and low-cost DC/DC converters and power semiconductors. * IR's expertise in both power semiconductors and power conversion circuits gives us a unique opportunity to work with our customers to address these needs. As a result, we are creating complete power conversion solutions using state-of-the-art power semiconductors targeted to meet the performance requirements at the lowest possible cost...and reduce our customers' design time and effort.
*
Pentium (R) is a registered trademark of Intel Corporation
January 1997
Power Conversion for the Pentium(R) Pro
*
A complete, turnkey power supply reference design to meet the requirements of Pentium Pro(R) microprocessors - Synchronous buck regulator design operating at 200kHz - 13A cont. output current, 2.0-3.5V selectable output (via a 4-bit DAC) - Greater than 92% efficiency - In excess of 30/sec transient load response - Short-circuit protection, over-voltage protection, power good output - One design meets requirements of all Pentium Pro class processors (155MHz Pentium all the way up to 266MHz Klamath) . . . or use lower cost FETs with the same design to save $$$ All of the above captured in a complete, reference design which includes: -Complete schematic and board layout (available in Gerber format) -Demonstration board (evaluated in hi-volume mfg. environment) -Complete power supply performance evaluation data -Detailed bill-of-materials with supplier information -Complete evaluation kit available . . . order as IRP6VRM1-EV
Pentium (R) is a registered trademark of Intel Corporation
January 1997
*
IRP6VRM1 Performance Results
Efficiency easily exceeds 80% across the full output voltage and current range with a peak over 92%.
The output voltage is regulated to within 1% of 3.5V set point from no load to full load.
Excellent loop characteristics keep the output voltage within +/-5% under transient load at 100Hz.
Low ESL of the output capacitors and good board design result in output voltage regulation of +/-5% January under transient load at 100kHz.
1997
FETKYTM for Synchronous Rectification
* As a synchronous rectifier, the industry's first FETKY (Gen 5 FET +
Schottky CoPack) reduces stray inductance between FET and Schottky improving efficiency while reducing board space and assembly cost.
100.0%
Efficiency Verses Load Current
MOSFET FETKY 95.0% Efficiency (%)
90.0%
Sources of Discrete Inductance Solution 2 D Pak leadframe & wires 6.5nH PCB traces 3.5nH SMB leadframe 2nH Total 12nH
10.0 12.0
Fetky 3.5nH n/a n/a 3.5nH
85.0% 0.0
2.0
4.0
6.0 8.0 Load Current (Amperes)
Use of a FETKY in place of a MOSFET increases efficiency by 1-2% reducing total losses by up to 25%
Inductance between the MOSFET and Schottky is reduced by ~75% compared to a discrete solution
* When compared with two SO-8 MOSFETs (Si4410 or IRF7413) in
parallel and one SMB Schottky, the FETKY offers similar current-handling but at 25% lower component cost and only one device to assemble instead of three!
IRL3103D1/S TM FETKY 30V, 0.014ohm Gen 5 Power MOSFET plus 2 30V, 0.42V @ 1A schottky in TO-220/D Pak
January 1997

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