LTC2909IDDB-2.5#TRPBF

Supervisors Overview

The LTC2909IDDB-2.5#TRPBF is a precision supervisory circuit manufactured by Analog Devices Inc., designed for monitoring multiple voltage rails in embedded systems. It features three independent input channels capable of detecting under-voltage, over-voltage, and negative voltage conditions. The device operates with a low supply current of 50 µA and supports a maximum supply voltage of 6 V. It provides an open-drain reset output with a fixed 200 ms delay and offers 1.5% accuracy. Packaged in an 8-lead DFN (3x2 mm) surface-mount case, it functions within a temperature range of -40°C to +85°C.

Supervisors Feature Summary

• Monitors three independent voltage inputs for under-voltage, over-voltage, and negative voltage faults
• Provides a single open-drain active-low reset signal with a fixed 200 ms timeout delay
• Operates with ultra-low quiescent current of 50 µA for battery-powered applications
• Delivers high accuracy of 1.5% across the specified industrial temperature range

Supervisors Applications

• Multi-rail power system supervision in industrial equipment
• Battery backup monitoring in portable electronic devices
• Negative voltage detection in mixed-signal circuits
• Over-voltage protection in communication infrastructure

Supervisors Procurement Notes

Verify the specific suffix #TRMPBF against the requested #TRPBF, as packaging variations may exist between cut tape and reel formats. Confirm availability status, as this component may be subject to limited supply or discontinuation notices from Analog Devices. Ensure the operating environment remains within the -40°C to +85°C junction temperature limits defined in the datasheet.

Supervisors Selection Notes

Select this component when simultaneous monitoring of three distinct voltage rails is required within a compact footprint. The fixed 200 ms reset delay suits applications tolerant of startup transients without requiring external timing components. Consider the 1.5% accuracy specification against system tolerance requirements. The open-drain output allows flexible interfacing with various logic families through appropriate pull-up resistor selection.

Supervisors Part Context

This part belongs to the LTC2909 family of precision supervisors, which includes variants with different packages such as SOT-23-8 and threshold configurations like 2.5V, 3.3V, and adjustable options. The IDDB designation indicates the industrial temperature grade and the 8-DFN package style. This series is engineered for cost-sensitive designs needing reliable fault detection without complex programming interfaces.

Supervisors Replacement Considerations

Direct substitutes include other LTC2909 variants with compatible pinouts and electrical characteristics, such as LTC2909IDDB-3.3#TRMPBF for similar monitoring needs with different thresholds. Verify that any replacement maintains the 6 V maximum supply rating and 50 µA quiescent current specifications to ensure equivalent power performance.