LTC2909
Precision Triple/Dual Input
UV, OV and Negative
Voltage Monitor
DESCRIPTIO
FEATURES
Two Low Voltage Adjustable Inputs (0.5V) The LTC 2909 is a dual input monitor intended for a variety
Pin Selectable Input Polarity Allows Negative of system monitoring applications. Polarity selection and
and OV Monitoring a buffered reference output allow the LTC2909 to monitor
Guaranteed Threshold Accuracy: 1.5% positive and negative supplies for undervoltage (UV) and
6.5V Shunt Regulator for High Voltage Operation overvoltage (OV) conditions.
Low 50A Quiescent Current
The two inputs have a nominal 0.5V threshold, featuring
Buffered 1V Reference for Negative Supply Offset
tight 1.5% threshold accuracy over the entire operating
Input Glitch Rejection
temperature range. Glitch ltering ensures reliable reset
Adjustable Reset Timeout Period
operation without false triggering. A third xed-threshold
Selectable Internal Timeout Saves Components
UVLO monitor on the parts V (also 1.5% accuracy) is
CC
Open-Drain RST Output
available for standard logic supplies.
Accurate UVLO for 2.5V, 3.3V, 5V Systems
The common reset output has a timeout that may use
Ultralow Voltage Reset: V = 0.5V Guaranteed
CC
a preset 200ms, be set by an external capacitor or be
Space Saving 8-Lead TSOT-23 and 3mm 2mm DFN
disabled. A three-state input pin sets the input polarity
Packages
of each adjustable input without requiring any external
U
components.
APPLICATIO S
The LTC2909 provides a highly versatile, precise, space-
Desktop and Notebook Computers
conscious, micropower solution for supply monitoring.
Handheld Devices
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
Network Servers
All other trademarks are the property of their respective owners.
Core, I/O Monitor
Automotive
TYPICAL APPLICATIO
3.3V UV/OV (Window) Monitor Application with
200ms Internal Timeout (3.3V Logic Out)
SEL Pin Connection for Input Polarity
C
BYP
Combinations
100nF
3.3V POLARITY
R R
P6 PU
V
ADJ1 ADJ2 SEL PIN
453k CC 10k
FAULT
ADJ1 RST
OUTPUT
V
++
CC
LTC2909-2.5
R
P5
REF SEL
10.7k OPEN
+
ADJ2 TMR
GND
R
P4
GND
76.8k
2909 TA01a
2909fb
1
U
ULTC2909
ABSOLUTE AXI U RATI GS (Notes 1, 2)
Terminal Voltages Operating Temperature Range
V (Note 3) ............................................. 0.3V to 6V LTC2909C ................................................ 0C to 70C
CC
SEL, RST .............................................. 0.3V to 7.5V LTC2909I ............................................. 40C to 85C
ADJ1, ADJ2 .......................................... 0.3V to 7.5V Storage Temperature Range
TMR ..........................................0.3V to (V + 0.3V) DFN .................................................... 65C to 125C
CC
Terminal Currents TSOT-23 ............................................. 65C to 150C
I (Note 3) ....................................................10mA Lead Temperature (Soldering, 10 sec)
VCC
I ....................................................................1mA TSOT-23 ............................................................300C
REF
UUW
PACKAGE/ORDER I FOR ATIO
ORDER PART DDB PART*
TOP VIEW
NUMBER MARKING
SEL 1 8 ADJ1
LTC2909CDDB-2.5 LBXG
TMR 2 7 ADJ2
9
LTC2909IDDB-2.5 LBXG
V 3 6 REF
CC
LTC2909CDDB-3.3 LBZS
RST 4 5 GND
LTC2909IDDB-3.3 LBZS
DDB PACKAGE
LTC2909CDDB-5 LBZT
8-LEAD (3mm 2mm) PLASTIC DFN
LTC2909IDDB-5 LBZT
T = 125C, = 76C/W
JMAX JA
EXPOSED PAD (PIN 9) MAY BE LEFT OPEN OR TIED TO GND
(PCB CONNECTION REQUIRED FOR STATED )
JA
ORDER PART TS8 PART*
TOP VIEW
NUMBER MARKING
ADJ1 1 8 SEL
ADJ2 2 7 TMR
LTC2909CTS8-2.5 LTBXF
REF 3 6 V
CC
LTC2909ITS8-2.5 LTBXF
GND 4 5 RST
LTC2909CTS8-3.3 LTBZV
TS8 PACKAGE
LTC2909ITS8-3.3 LTBZV
8-LEAD PLASTIC TSOT-23
T = 125C, = 250C/W
JMAX JA
LTC2909CTS8-5 LTBZW
LTC2909ITS8-5 LTBZW
Order Options Tape and Reel: Add #TR Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: