News Release from: Summit Microelectronics
Edited by the Electronicstalk Editorial Team on 7 April 2003
Low-cost tracking for multiple-voltage systems
A novel two-channel device limits the voltage differential between power supply channels to less than 100mV while controlling their ramp rate during power-up and -down to an internally set rate.
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The SMT2002 dual-channel Trakker is a two-channel device that limits the voltage differential between power supply channels to less than 100mV while controlling their ramp rate during power-up and -down to an internally set rate of 500V/s. Tracking is the most dependable turn-on control for preventing latch-up and ensuring long-term reliability in supplying power to multiple-voltage high-performance devices where core and I/O voltage levels need to meet precise turn-on requirements. The part can be used alone or in conjunction with the Summit SMS24, SMS44 or SMS64 sequencing controllers to implement additional monitoring functions across more channels.
A status output on the device indicates when the track-up and track-down are complete.
The device is a drop-in solution that controls external mosfets' gates to perform the operation of minimising the voltage differential of the supplies as they are turned on.
Once the input/output voltage difference across the mosfets is reduced to 200mV, tracking is considered complete and the gate voltages are then fully enhanced for ongoing operation.
The same sequence occurs during power down.
Designed for use in point-of-load power applications or in multi-supply-rail systems, the device plays an important role in mezzanine line cards and multiple-voltage network processors, digital signal processors and ASICs.
The part is also essential in cost-sensitive applications demanding voltage tracking, such as cable modem consumer premise equipment (CPE), xDSL CPE, and set-top boxes.
The SMT2002 is available today in a 14-lead SOIC package, priced at $2.95 each in quantities of 10,000.
The device can also be purchased as a 16-lead SSOP for $2.85 each in quantities of 10,000 parts.
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