Overview
Features and Benefits
- Two Low Voltage Adjustable Inputs (0.5V)
- Pin Selectable Input Polarity Allows Negative and OV Monitoring
- Guaranteed Threshold Accuracy: ±1.5%
- 6.5V Shunt Regulator for High Voltage Operation
- Low 50μA Quiescent Current
- Buffered 1V Reference for Negative Supply Offset
- Input Glitch Rejection
- Adjustable Reset Timeout Period
- Selectable Internal Timeout Saves Components
- Open-Drain RST Output
- Accurate UVLO for 2.5V, 3.3V, 5V Systems
- Ultralow Voltage Reset: VCC = 0.5V Guaranteed
- Space Saving 8-Lead TSOT-23 and 3mm × 2mm DFN Packages
Product Details
The LTC2909 is a dual input monitor intended for a variety of system monitoring applications. Polarity selection and a buffered reference output allow the LTC2909 to monitor positive and negative supplies for undervoltage (UV) and overvoltage (OV) conditions.
The two inputs have a nominal 0.5V threshold, featuring tight 1.5% threshold accuracy over the entire operating temperature range. Glitch filtering ensures reliable reset operation without false triggering. A third fixed-threshold UVLO monitor on the part’s VCC (also 1.5% accuracy) is available for standard logic supplies.
The common reset output has a timeout that may use a preset 200ms, be set by an external capacitor or be disabled. A three-state input pin sets the input polarity of each adjustable input without requiring any external components.
The LTC2909 provides a highly versatile, precise, space-conscious, micropower solution for supply monitoring.
Applications
- Desktop and Notebook Computers
- Handheld Devices
- Network Servers
- Core, I/O Monitor
- Automotive
Product Categories
Product Lifecycle
Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Documentation & Resources
-
R413 Reliability Data3/26/2018
Tools & Simulations
LTspice
LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.
Models for the following parts are available in LTspice:
LTC2909-25
LTC2909-33
LTC2909-50
Design Resources
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.
Support & Discussions
LTC2909 Discussions
Sample & Buy
Ordering FAQs
See our Ordering FAQs for answers to questions about online orders, payment options and more.
Buy Now Pricing
(**) Displayed Buy Now Price and Price Range is based on small quantity orders.
List Pricing
(*)The 1Ku list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
Lead Times
Please see the latest communication from our CCO regarding lead times.
Sampling
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