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VOLUME -24 NUMBER 12
Publication Date: 12/1/2009
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Special Features: Test and Measurement
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December 2009 Issue
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Linear Intros Configurable Supply Monitor
Milpitas, CA — Linear Technology Corporation has introduced the LTC2939, a 6-channel supply monitor with processor supervisory functions that can be configured for low voltage applications down to 1.2V. One of sixteen preset or adjustable voltage threshold combinations can be selected, all of which maintain an accuracy of ±1.5 percent from -40 to +125°C. These preset set points are selected through an external resistive pair on a single pin, while the actual thresholds are set by integrated precision dividers for 5, 3.3, 2.5 and 1.5V supply monitoring.
Built-in power supply glitch immunity allows the monitor to practically eliminate false detections, while only using 80µA of supply current. Set points, reset timeout period and watchdog timeout period are all at the discretion of the designer when using the LTC2939 to monitor multiple positive and negative power rails. The product is suitable for large systems where board space is at a premium and a single supervisor is needed. Oftentimes, multiple supervisor ICs can be found throughout a board, monitoring only a few power rails. The LTC2939 is small and provides the necessary flexibility to consolidate these devices into one IC without compromising functionality or performance. Reset and watchdog timeout periods are easily adjusted using a single external capacitor. A three-state watchdog input allows users to conveniently disable the watchdog function if needed. In addition, a watchdog status output is available, which triggers upon either a watchdog timeout or anytime an undervoltage condition occurs.
Contact: Linear Technology Corp., 1630 McCarthy Blvd., Milpitas, CA 95035-7417
408-432-1900 fax: 408-434-0507 Web:
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