LTC2919 Datasheet, PDF (1/16 Pages) Linear Technology – Precision Triple/Dual Input UV, OV and NegativeVoltage Monitor

FEATURES
■ _{Two Low Voltage Adjustable Inputs (0.5V)}
■ _{Accurate UVLO Provides a Third Monitor Input}
■ _{Open-Drain RST, OUT1 and OUT2 Outputs}
■ _{Pin Selectable Input Polarity Allows Negative, UV}
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}
■ _{Outputs Guaranteed Low With VCC = 0.5V}
■ _{Space Saving 10-Lead 3mm × 2mm DFN and MSOP}
Packages
U
APPLICATIO S
■ _{Desktop and Notebook Computers}
■ _{Network Servers}
■ _{Core, I/O Monitor}
■ _Automotive
LTC2919
Precision Triple/Dual Input
UV, OV and Negative
Voltage Monitor
DESCRIPTIO
The LTC^®2919 is a triple/dual input monitor intended for a
variety of system monitoring applications. Polarity selec-
tion and a buffered reference output allow the LTC2919 to
monitor positive and negative supplies for undervoltage
(UV) and overvoltage (OV) conditions.
The two adjustable inputs have a nominal 0.5V threshold,
featuring tight 1.5% threshold accuracy over the entire
operating temperature range. Glitch filtering ensures out-
puts operate reliably without false triggering. An accurate
threshold at the V_CC pin provides a third input supply
monitor for a 2.5V, 3.3V or 5V supply.
Two independent output pins indicate the status of each
adjustable input. A third common output provides a
configurable reset timeout that may be set by an accu-
rate internal 200ms timer, programmed with an external
capacitor, or disabled for a fast response. A three-state
input pin sets the input polarity of each adjustable input
without requiring any external components.
The LTC2919 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. Protected by U.S. Patents,
including 6949965, 7292076.
TYPICAL APPLICATIO
3.3V UV/OV (Window) Monitor Application with
200ms Internal Timeout (3.3V Logic Out)
3.3V
453k
10.7k
76.8k
V_CC
LTC2919–2.5
ADJ1 OUT1
REF
OUT2
ADJ2
RST
SEL
TMR
GND
10k
10k
UV
OV
0.1μF
10k
FAULT
2919 TA01a
SEL Pin Connection for Input Polarity
Combinations
POLARITY
ADJ1
ADJ2
SEL PIN
+
+
V_CC
+
–
OPEN
–
–
GND
2919f
1