LTC2909(RevA) データシートの表示（PDF） - Linear Technology
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LTC2909 Datasheet PDF : 16 Pages
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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 ⎯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
U
APPLICATIO S
■ Desktop and Notebook Computers
■ Handheld Devices
■ Network Servers
■ Core, I/O Monitor
■ 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 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.
, 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
+
–
OPEN
–
–
GND
2909fa
1
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