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Power supervisor monitors own UV, OV inputs

Posted: 03 Mar 2008 ?? ?Print Version ?Bookmark and Share

Keywords:power supervisor? adjustable input? power monitoring?

Linear Technology Corp. has released the LTC2919 a triple supervisor that monitors its own supply voltage and two adjustable inputs.

Polarity selection and a buffered reference output allow the LTC2919 to monitor a combination of two positive or negative supplies for undervoltage (UV) and overvoltage (OV) conditions. The two inputs have a nominal 0.5V threshold and tight 1.5 percent accuracy over the full temperature range.

In addition to monitoring the two adjustable inputs for UV or OV, the LTC2919 monitors the supply voltage at 2.5V, 3.3V or 5V at a fixed -10 percent UV. The adjustable trip thresholds are set with an external resistive divider network, giving users complete control over the trip point. Offered in the tiny MSOP-10 and 3mm x 2mm DFN-10 packages, this supervisor draws only 50?A. With guaranteed specifications across the -40?C to 125?C temperature range, the LTC2919 can be used in a wide variety of designs, including network servers and multirail systems.

The LTC2919 also includes a common open-drain reset output and two open-drain comparator outputs that indicate the status of the adjustable inputs. The individual comparator outputs simplify sequencing positive and negative supplies. The reset timeout period can be set to a fixed 400?s, fixed 200ms, an adjustable period or disabled for fast response. Glitch filtering ensures reliable reset operation without false triggering and the LTC2919 guarantees the reset output once VCC rises above 0.5V.

Besides monitoring low voltages, the LTC2919's VCC supply includes a 6.5V shunt regulator, which when connected to an external current limiting resistor, allows a high voltage supply to power the device. This makes the LTC2919 a good fit for multichannel low voltage designs and high voltage positive or negative monitoring.

The LTC2919 is available today in commercial, industrial, and automotive temperature grades, with pricing beginning at $1.75 each, in 1,000-piece quantities.

Linear Tech is one of the exhibitors in the upcoming IIC-China 2008.

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