LTC2909 - Precision Triple/Dual Input UV, OV and Negative Voltage Monitor

Features

  • 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

Typical Application

LTC2909 Typical Application
LTC2909 Typical Application

Description

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.

Packaging

CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.

For complete and up to date package information and drawings, please refer to our packaging page

Part Number Package Code Temp Package
Drawing
RoHS
LTC2909CDDB-2.5#PBF 3x2 DFN-8 DDB C 05-08-1702 Yes
LTC2909CDDB-2.5#TRMPBF 3x2 DFN-8 DDB C 05-08-1702 Yes
LTC2909CDDB-2.5#TRPBF 3x2 DFN-8 DDB C 05-08-1702 Yes
LTC2909CDDB-3.3#PBF 3x2 DFN-8 DDB C 05-08-1702 Yes
LTC2909CDDB-3.3#TRMPBF 3x2 DFN-8 DDB C 05-08-1702 Yes
LTC2909CDDB-3.3#TRPBF 3x2 DFN-8 DDB C 05-08-1702 Yes
LTC2909CDDB-5#PBF 3x2 DFN-8 DDB C 05-08-1702 Yes
LTC2909CDDB-5#TRMPBF 3x2 DFN-8 DDB C 05-08-1702 Yes
LTC2909CDDB-5#TRPBF 3x2 DFN-8 DDB C 05-08-1702 Yes
LTC2909CTS8-2.5#PBF SOT-23 TS8 C 05-08-1637 Yes
LTC2909CTS8-2.5#TRMPBF SOT-23 TS8 C 05-08-1637 Yes
LTC2909CTS8-2.5#TRPBF SOT-23 TS8 C 05-08-1637 Yes
LTC2909CTS8-3.3#PBF SOT-23 TS8 C 05-08-1637 Yes
LTC2909CTS8-3.3#TRMPBF SOT-23 TS8 C 05-08-1637 Yes
LTC2909CTS8-3.3#TRPBF SOT-23 TS8 C 05-08-1637 Yes
LTC2909CTS8-5#PBF SOT-23 TS8 C 05-08-1637 Yes
LTC2909CTS8-5#TRMPBF SOT-23 TS8 C 05-08-1637 Yes
LTC2909CTS8-5#TRPBF SOT-23 TS8 C 05-08-1637 Yes
LTC2909IDDB-2.5#PBF 3x2 DFN-8 DDB I 05-08-1702 Yes
LTC2909IDDB-2.5#TRMPBF 3x2 DFN-8 DDB I 05-08-1702 Yes
LTC2909IDDB-2.5#TRPBF 3x2 DFN-8 DDB I 05-08-1702 Yes
LTC2909IDDB-3.3#PBF 3x2 DFN-8 DDB I 05-08-1702 Yes
LTC2909IDDB-3.3#TRMPBF 3x2 DFN-8 DDB I 05-08-1702 Yes
LTC2909IDDB-3.3#TRPBF 3x2 DFN-8 DDB I 05-08-1702 Yes
LTC2909IDDB-5#PBF 3x2 DFN-8 DDB I 05-08-1702 Yes
LTC2909IDDB-5#TRMPBF 3x2 DFN-8 DDB I 05-08-1702 Yes
LTC2909IDDB-5#TRPBF 3x2 DFN-8 DDB I 05-08-1702 Yes
LTC2909ITS8-2.5#PBF SOT-23 TS8 I 05-08-1637 Yes
LTC2909ITS8-2.5#TRMPBF SOT-23 TS8 I 05-08-1637 Yes
LTC2909ITS8-2.5#TRPBF SOT-23 TS8 I 05-08-1637 Yes
LTC2909ITS8-3.3#PBF SOT-23 TS8 I 05-08-1637 Yes
LTC2909ITS8-3.3#TRMPBF SOT-23 TS8 I 05-08-1637 Yes
LTC2909ITS8-3.3#TRPBF SOT-23 TS8 I 05-08-1637 Yes
LTC2909ITS8-5#PBF SOT-23 TS8 I 05-08-1637 Yes
LTC2909ITS8-5#TRMPBF SOT-23 TS8 I 05-08-1637 Yes
LTC2909ITS8-5#TRPBF SOT-23 TS8 I 05-08-1637 Yes


LTC2909 Package Drawing
LTC2909 Package Drawing

Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
  • Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number Package Temp Price
(1-99)
Price
(1k)*
RoHS
LTC2909CDDB-2.5#PBF 3x2 DFN-8 C $2.30 Yes
LTC2909CDDB-2.5#TRMPBF 3x2 DFN-8 C $2.30 $1.63 Yes
LTC2909CDDB-2.5#TRPBF 3x2 DFN-8 C $2.30 $1.61 Yes
LTC2909CDDB-3.3#PBF 3x2 DFN-8 C $2.30 Yes
LTC2909CDDB-3.3#TRMPBF 3x2 DFN-8 C $2.30 $1.63 Yes
LTC2909CDDB-3.3#TRPBF 3x2 DFN-8 C $2.30 $1.61 Yes
LTC2909CDDB-5#PBF 3x2 DFN-8 C $2.30 Yes
LTC2909CDDB-5#TRMPBF 3x2 DFN-8 C $2.30 $1.63 Yes
LTC2909CDDB-5#TRPBF 3x2 DFN-8 C $2.30 $1.61 Yes
LTC2909CTS8-2.5#PBF SOT-23 C $2.30 Yes
LTC2909CTS8-2.5#TRMPBF SOT-23 C $2.30 $1.63 Yes
LTC2909CTS8-2.5#TRPBF SOT-23 C $2.30 $1.61 Yes
LTC2909CTS8-3.3#PBF SOT-23 C $2.30 Yes
LTC2909CTS8-3.3#TRMPBF SOT-23 C $2.30 $1.63 Yes
LTC2909CTS8-3.3#TRPBF SOT-23 C $2.30 $1.61 Yes
LTC2909CTS8-5#PBF SOT-23 C $2.30 Yes
LTC2909CTS8-5#TRMPBF SOT-23 C $2.30 $1.63 Yes
LTC2909CTS8-5#TRPBF SOT-23 C $2.30 $1.61 Yes
LTC2909IDDB-2.5#PBF 3x2 DFN-8 I $2.73 Yes
LTC2909IDDB-2.5#TRMPBF 3x2 DFN-8 I $2.73 $1.93 Yes
LTC2909IDDB-2.5#TRPBF 3x2 DFN-8 I $2.73 $1.91 Yes
LTC2909IDDB-3.3#PBF 3x2 DFN-8 I $2.73 Yes
LTC2909IDDB-3.3#TRMPBF 3x2 DFN-8 I $2.73 $1.93 Yes
LTC2909IDDB-3.3#TRPBF 3x2 DFN-8 I $2.73 $1.91 Yes
LTC2909IDDB-5#PBF 3x2 DFN-8 I $2.73 Yes
LTC2909IDDB-5#TRMPBF 3x2 DFN-8 I $2.73 $1.93 Yes
LTC2909IDDB-5#TRPBF 3x2 DFN-8 I $2.73 $1.91 Yes
LTC2909ITS8-2.5#PBF SOT-23 I $2.73 Yes
LTC2909ITS8-2.5#TRMPBF SOT-23 I $2.73 $1.93 Yes
LTC2909ITS8-2.5#TRPBF SOT-23 I $2.73 $1.91 Yes
LTC2909ITS8-3.3#PBF SOT-23 I $2.73 Yes
LTC2909ITS8-3.3#TRMPBF SOT-23 I $2.73 $1.93 Yes
LTC2909ITS8-3.3#TRPBF SOT-23 I $2.73 $1.91 Yes
LTC2909ITS8-5#PBF SOT-23 I $2.73 Yes
LTC2909ITS8-5#TRMPBF SOT-23 I $2.73 $1.93 Yes
LTC2909ITS8-5#TRPBF SOT-23 I $2.73 $1.91 Yes
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* The USA 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 Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Click here to view our complete list of demo boards

Applications

  • Desktop and Notebook Computers
  • Handheld Devices
  • Network Servers
  • Core, I/O Monitor
  • Automotive

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Design Tools

LTspice

LTspice® software is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice

Models for the following parts are available in LTspice:
LTC2909-25
LTC2909-33
LTC2909-50

Technical Support