Product category:
Power Supply ICs and Controllers
News Release from: Intersil | Subject: Endura ISL6556A and ISL6556B
Edited by the Electronicstalk Editorial
Team on 24 April 2003
PWM controllers take on latest
motherboards
The Endura ISL6556A and ISL6556B precision multiphase PWM controller ICs provide the stability and precision required to power the new-generation VR10.X processors.
The Endura ISL6556A and ISL6556B precision multiphase PWM controller ICs provide the stability and precision required to power the new-generation VR10.X processors while conserving board space and reducing manufacturing costs They are also backward compatible with VR9.X platforms
This article was originally published on Electronicstalk on 8 Jan 2001 at 8.00am (UK)
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"The ISL6556A and ISL6556B represent Intersil's continuing ability to provide the industry's highest performance-to-price ratio in advanced CPU power solutions", said Rick Furtney, Vice President and General Manager of Intersil's High Performance Analogue Product Group.
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"We reaffirm our pledge to provide our industry partners with power solutions that ensure reliability, high performance and cost competitiveness".
The ISL6556A/B ICs provide core voltage regulation by driving up to four synchronous-rectified buck channels in parallel.
Both devices feature the industry's best 0.5% reference voltage tolerance.
This extremely tight tolerance allows better load-line adherence than competing solutions and also results in fewer components, lower cost, reduced power dissipation, and a smaller implementation area.
A unity-gain differential amplifier is provided for remote voltage sensing.
Any potential difference between remote and local grounds is virtually eliminated using the remote-sensing amplifier.
Mosfet on-resistance current sensing is used to measure current in each phase and also to generate droop current.
On-resistance current sensing has been demonstrated to provide the most accurate load-line adherence.
Accuracy of droop is ensured with the use of a negative temperature coefficient (NTC) compensation circuit that is used to nullify the effect of on-resistance temperature sensitivity.
The use of temperature compensation with the competing inductor DC resistance sense methods only partially addresses the problems with those methods.
The ISL6556A employs an external NTC circuit while the ISL6556B has the NTC thermistor on-chip, saving part cost and board space without sacrificing performance.
A threshold-sensitive enable input is available to accurately coordinate the start up of the ISL6556A with any other voltage rail.
Dynamic VIDT technology allows seamless on-the-fly VID changes.
The offset pin allows accurate voltage offset settings that are independent of VID settings.
The ISL6556A/B ICs use a 5V bias and have a built-in shunt regulator to allow 12V bias using only a small external limiting resistor.
Both ICs offer +/-0.5% system accuracy over life, load, line and temperature.
The ISL6556A/B ICs interface with Intersil's mosfet driver ICs, such as the HIP6601B, HIP6602B, HIP6604B, or ISL6605, to create a compact, high-performance, VR10.X- or VR9.X-compliant, cost-effective power solution.
These drivers also come in space-saving QFN packages.
Reference designs and evaluation platforms are available.
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