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

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.

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

Applications

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

Packaging

Order Information

Part Number	Package	Temp	Price(1-99)	Price (1k)*
LTC2909CDDB-2.5#PBF	3x2 DFN-8	C	$2.30
LTC2909CDDB-2.5#TRMPBF	3x2 DFN-8	C	$2.30	$1.63
LTC2909CDDB-2.5#TRPBF	3x2 DFN-8	C	$2.30	$1.61
LTC2909CDDB-3.3#PBF	3x2 DFN-8	C	$2.30
LTC2909CDDB-3.3#TRMPBF	3x2 DFN-8	C	$2.30	$1.63
LTC2909CDDB-3.3#TRPBF	3x2 DFN-8	C	$2.30	$1.61
LTC2909CDDB-5#PBF	3x2 DFN-8	C	$2.30
LTC2909CDDB-5#TRMPBF	3x2 DFN-8	C	$2.30	$1.63
LTC2909CDDB-5#TRPBF	3x2 DFN-8	C	$2.30	$1.61
LTC2909CTS8-2.5#PBF	SOT-23	C	$2.30
LTC2909CTS8-2.5#TRMPBF	SOT-23	C	$2.30	$1.63
LTC2909CTS8-2.5#TRPBF	SOT-23	C	$2.30	$1.61
LTC2909CTS8-3.3#PBF	SOT-23	C	$2.30
LTC2909CTS8-3.3#TRMPBF	SOT-23	C	$2.30	$1.63
LTC2909CTS8-3.3#TRPBF	SOT-23	C	$2.30	$1.61
LTC2909CTS8-5#PBF	SOT-23	C	$2.30
LTC2909CTS8-5#TRMPBF	SOT-23	C	$2.30	$1.63
LTC2909CTS8-5#TRPBF	SOT-23	C	$2.30	$1.61
LTC2909IDDB-2.5#PBF	3x2 DFN-8	I	$2.73
LTC2909IDDB-2.5#TRMPBF	3x2 DFN-8	I	$2.73	$1.93
LTC2909IDDB-2.5#TRPBF	3x2 DFN-8	I	$2.73	$1.91
LTC2909IDDB-3.3#PBF	3x2 DFN-8	I	$2.73
LTC2909IDDB-3.3#TRMPBF	3x2 DFN-8	I	$2.73	$1.93
LTC2909IDDB-3.3#TRPBF	3x2 DFN-8	I	$2.73	$1.91
LTC2909IDDB-5#PBF	3x2 DFN-8	I	$2.73
LTC2909IDDB-5#TRMPBF	3x2 DFN-8	I	$2.73	$1.93
LTC2909IDDB-5#TRPBF	3x2 DFN-8	I	$2.73	$1.91
LTC2909ITS8-2.5#PBF	SOT-23	I	$2.73
LTC2909ITS8-2.5#TRMPBF	SOT-23	I	$2.73	$1.93
LTC2909ITS8-2.5#TRPBF	SOT-23	I	$2.73	$1.91
LTC2909ITS8-3.3#PBF	SOT-23	I	$2.73
LTC2909ITS8-3.3#TRMPBF	SOT-23	I	$2.73	$1.93
LTC2909ITS8-3.3#TRPBF	SOT-23	I	$2.73	$1.91
LTC2909ITS8-5#PBF	SOT-23	I	$2.73
LTC2909ITS8-5#TRMPBF	SOT-23	I	$2.73	$1.93
LTC2909ITS8-5#TRPBF	SOT-23	I	$2.73	$1.91