Product category:
Power Supply ICs and Controllers
News Release from: Intersil | Subject: ISL6225
Edited by the Electronicstalk Editorial
Team on 02 May 2002
Dual-output controller for flexible
power
The Endura ISL6225 is a highly efficient next-generation dual PWM controller IC for mobile applications.
The Endura ISL6225 is a highly efficient next-generation dual PWM controller IC for mobile applications Designed and manufactured by Intersil, the ISL6225 offers designers space savings, lower parts count and a new dimension in application flexibility
This article was originally published on Electronicstalk on 8 Oct 2008 at 8.00am (UK)
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Applications include dual independent PWM control, current sharing, dual-stage conversion, or DDR memory power control with zero-cost on-chip tracking for the termination voltage and a buffered reference voltage.
Today's notebook PC systems operate from battery and battery charger voltages that typically range up to 20 V in normal operation.
The voltages used in these systems are derived directly from these relatively high-voltage sources whenever possible in order to maximise the power efficiency of the total system.
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The ISL6225 is capable of operating from these higher voltages in all modes of operation, and when used as a DDR memory controller, it further enhances system efficiency by operating in a cascaded mode.
The ISL6225 also incorporates a hysteretic mode of operation that enables high efficiencies when operating at light loads, such as when the system is in a sleep state.
The outputs of this flexible controller can be configured as two independent, out of phase switching supplies, as a current-sharing controller with two-phases converting from different supplies, or as a double datarate (DDR), DDR-II, or quad datarate (QDR) memory power supply.
In all configurations, the ISL6225 can be used with input voltages as high as 24V.
By using the hysteretic mode of operation in the ISL6225, designers can further reduce the complexity of their mobile power architecture and eliminate large, expensive and power hungry linear controllers.
The ISL6225 brings numerous benefits to designers of mobile products as well as the end users of products incorporating an ISL6225.
All consumers are interested in extending the time their mobile systems can operate on a battery charge as well as reducing audible noise.
The ISL6225 enables longer operating and standby times by providing higher efficiency in all operating modes and reducing the need for noisy, power hungry fans to remove heat.
Lossless current sensing and a hysteretic mode of operation enable the ISL6225 to generate less heat than other power supply controllers.
Designers of DDR memory based products can realise further improvements in efficiency by using the ISL6225 in a cascaded arrangement.
This topology provides a significant improvement in efficiency over other architectures, and the ability to convert directly from the higher battery voltages totally eliminates an intermediate stage of power conversion.
In all modes of operation, the ISL6225 offers 1% or better voltage accuracy, protection from overvoltage, undervoltage and overcurrent events, programmable power sequencing, and independent power good signals.
In addition to reducing the physical size of a product, these internal features help to eliminate additional external circuitry and improve overall system reliability.
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