Triple Supervisor Monitors Positive or Negative Supplies for Overvoltage & Undervoltage Conditions

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% 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 50uA. 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 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 400us, 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. In addition to 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.