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LTC2909_15 Datasheet, PDF (1/16 Pages) Linear Technology – Precision Triple/Dual Input UV, OV and Negative Voltage Monitor | |||
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FEATURES
â Two Low Voltage Adjustable Inputs (0.5V)
â Pin Selectable Input Polarity Allows Negative
and OV Monitoring
â Guaranteed Threshold Accuracy: ±1.5%
â 6.5V Shunt Regulator for High Voltage Operation
â Low 50μA Quiescent Current
â Buffered 1V Reference for Negative Supply Offset
â Input Glitch Rejection
â Adjustable Reset Timeout Period
â Selectable Internal Timeout Saves Components
â Open-Drain â¯Râ¯Sâ¯T Output
â Accurate UVLO for 2.5V, 3.3V, 5V Systems
â Ultralow Voltage Reset: VCC = 0.5V Guaranteed
â Space Saving 8-Lead TSOT-23 and 3mm à 2mm DFN
Packages
U
APPLICATIO S
â Desktop and Notebook Computers
â Handheld Devices
â Network Servers
â Core, I/O Monitor
â Automotive
LTC2909
Precision Triple/Dual Input
UV, OV and Negative
Voltage Monitor
DESCRIPTIO
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 ï¬ltering ensures reliable reset
operation without false triggering. A third ï¬xed-threshold
UVLO monitor on the partâs 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.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATIO
3.3V UV/OV (Window) Monitor Application with
200ms Internal Timeout (3.3V Logic Out)
3.3V
RP6
453k
RP5
10.7k
RP4
76.8k
CBYP
100nF
RPU
VCC
10k
ADJ1
RST
LTC2909-2.5
REF
SEL
ADJ2
TMR
GND
2909 TA01a
FAULT
OUTPUT
SEL Pin Connection for Input Polarity
Combinations
POLARITY
ADJ1
ADJ2
SEL PIN
+
+
VCC
+
â
OPEN
â
â
GND
2909fb
1
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