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LTC2909ITS8-2.5 Datasheet(PDF) 1 Page - Linear Technology |
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LTC2909ITS8-2.5 Datasheet(HTML) 1 Page - Linear Technology |
1 / 16 page LTC2909 1 2909fa SEL Pin Connection for Input Polarity Combinations POLARITY ADJ1 ADJ2 SEL PIN ++ VCC +– OPEN –– GND Precision Triple/Dual Input UV, OV and Negative Voltage Monitor ■ Desktop and Notebook Computers ■ Handheld Devices ■ Network Servers ■ Core, I/O Monitor ■ Automotive ■ 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 ⎯R⎯S⎯T 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 3.3V UV/OV (Window) Monitor Application with 200ms Internal Timeout (3.3V Logic Out) VCC ADJ1 LTC2909-2.5 REF ADJ2 RST SEL RPU 10k FAULT OUTPUT 2909 TA01a RP6 453k 3.3V RP5 10.7k RP4 76.8k CBYP 100nF TMR GND The LTC®2909 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. FEATURES DESCRIPTIO APPLICATIO S TYPICAL APPLICATIO , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. |
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