Precision triple voltage supervisor
16 April 2008
Power Electronics / Power Management
Linear Technology has introduced the LTC2919, a versatile triple supervisor that monitors its own supply voltage and two adjustable inputs. Polarity selection and a buffered reference output allow it to monitor a combination of two positive or negative supplies for undervoltage (UV) and overvoltage (OV) conditions. The two inputs have a nominal 0,5 V threshold and tight ±1,5% 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 2,5 V, 3,3 V or 5 V at a fixed -10% 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 3 x 2 mm DFN-10 packages, this supervisor draws only 50 μA. With guaranteed specifications across the -40°C to +125°C temperature range, it can be used in a wide variety of designs, including network servers and multirail systems.
The LTC2919 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 of positive and negative supplies. The reset timeout period can be set to a fixed 400 μs, fixed 200 ms, 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 0,5 V.
In addition to monitoring low voltages, the LTC2919’s VCC supply includes a 6,5 V shunt regulator, which when connected to an external current limiting resistor, allows a high voltage supply to power the device. This makes it a good fit for multichannel low voltage designs and high voltage positive or negative monitoring.
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