LTC2912
Single UV/OV
Voltage Monitor
FEATURES DESCRIPTION
n
Monitors Single Voltage
The LTC 2912 voltage monitor is designed to detect power
n
Adjustable UV and OV Trip Values
supply undervoltage and overvoltage events. The VL and
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Guaranteed Threshold Accuracy: 1.5%
VH monitor inputs include filtering to reject brief glitches,
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Power Supply Glitch Immunity
thereby ensuring reliable reset operation without false or
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Adjustable Reset Timeout with Timeout Disable
noisy triggering. An adjustable timer defines the duration
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29A Quiescent Current
of the overvoltage and undervoltage reset outputs which
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Open Drain OV and UV Outputs
function independently. While the LTC2912 operates
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Guaranteed OV and UV for V 1V
directly from 2.3V to 6V supplies, an internal V shunt
CC
CC
TM
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Available in 8 Lead ThinSOT and (3mm 2mm)
regulator coupled with low supply current demand allows
DFN Packages
operation from higher voltages such as 12V, 24V or 48V.
Three output configurations are available: the LTC29121
has a latch control for the OV output; the LTC2912 2
APPLICATIONS
has an OV and UV output disable feature for margining
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Desktop and Notebook Computers
applications; the LTC2912 3 is identical to the LTC2912 1
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Network Servers
but with a noninverting, OV output.
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Core, I/O Voltage Monitors
The LTC2912 provides a precise, versatile, space conscious
micropower solution for voltage monitoring.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property
of their respective owners.
TYPICAL APPLICATION
Single OV/UV Supply Monitor, 3.3V 10% Tolerance Reset Time-Out Period vs Capacitance
10000
3.3V
POWER
SUPPLY
0.1F
1000
27.4k
V
CC
SYSTEM
VH OV
100
LTC2912-1
1k
VL UV
4.53k
10
LATCH
GND TMR
2912 TA01a
1
22nF
0.1 1 10 100 1000
TIMEOUT = 200ms
TMR PIN CAPACITANCE, C (nF)
TMR
2912 G08
2912fb
1
For more information www.linear.com/LTC2912
UV/OV TIMEOUT PERIOD, t (ms)
UOTOLTC2912
ABSOLUTE MAXIMUM RATINGS (Note 1)
Terminal Voltages Operating Temperature Range
V (Note 3) ............................................. 0.3V to 6V LTC2912C ................................................ 0C to 70C
CC
OV, UV, OV ............................................. 0.3V to 16V LTC2912I .............................................40C to 85C
TMR ..........................................0.3V to (V + 0.3V) LTC2912H .......................................... 40C to 125C
CC
VH, VL, LATCH, DIS ...............................0.3V to 7.5V Storage Temperature Range
Terminal Currents TSOT .................................................. 65C to 125C
I ....................................................................10mA DFN .................................................... 65C to 150C
VCC
I , I , I ........................................................10mA Lead Temperature (Soldering, 10 sec)
UV OV OV
TSOT .................................................................300C
PACKAGE/ORDER INFORMATION
LTC2912 1 LTC2912 1
TOP VIEW
TOP VIEW
V 1 8 LATCH
CC
LATCH 1 8 V
CC
VH 2 7 UV
UV 2 7 VH
9
VL 3 6 OV
OV 3 6 VL
TMR GND
4 5
GND 4 5 TMR
TS8 PACKAGE
8-LEAD PLASTIC TSOT-23
DDB PACKAGE
8-LEAD (3mm 2mm) PLASTIC DFN
T = 150C, = 195C/W
JMAX JA
T = 125C, = 55C/W
JMAX JA
EXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO PCB
LTC2912 2 LTC2912 2
TOP VIEW
TOP VIEW
V 1 8 DIS
CC
DIS 1 8 V
CC
VH 2 7 UV
UV 2 7 VH
9
VL 3 6 OV
OV 3 6 VL
TMR GND
4 5
GND 4 5 TMR
TS8 PACKAGE
8-LEAD PLASTIC TSOT-23
DDB PACKAGE
8-LEAD (3mm 2mm) PLASTIC DFN
T = 125C, = 55C/W
JMAX JA
T = 125C, = 55C/W
JMAX JA
EXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO PCB
LTC2912 3 LTC2912 3
TOP VIEW
TOP VIEW
V 1 8 LATCH
CC
LATCH 1 8 V
CC
VH 2 7 UV
UV 2 7 VH
9
VL OV
3 6
OV 3 6 VL
TMR 4 5 GND
GND 4 5 TMR
TS8 PACKAGE
8-LEAD PLASTIC TSOT-23
DDB PACKAGE
8-LEAD (3mm 2mm) PLASTIC DFN
T = 125C, = 55C/W
JMAX JA
T = 125C, = 55C/W
JMAX JA
EXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO PCB
2912fb
2
For more information www.linear.com/LTC2912