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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%
www.Da6t.a5SVheSeht4uUn.ct oRmegulator 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 VCC 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
VCC
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
+ + VCC
+ – OPEN
– – GND
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LTC2919
ABSOLUTE AXI U RATI GS (Notes 1, 2)
Terminal Voltages
VOCUCT(1N, oOtUeT32),..R...S..T.....................................................................–..0–.03.V3Vtoto7.65VV
ADJ1, ADJ2 .......................................... –0.3V to 7.5V
TMR, SEL..................................–0.3V to (VCC + 0.3V)
Terminal Currents
ICC (Note 3)......................................................±10mA
IREF ....................................................................±1mA
Operating Temperature Range
LTC2919C ................................................ 0°C to 70°C
LTC2919I..............................................– 40°C to 85°C
LTC2919H .......................................... –40°C to 125°C
Maximum Junction Temperature........................... 150°C
Storage Temperature Range...................– 65°C to 150°C
Lead Temperature (Soldering, 10 sec)
MSOP-10 .......................................................... 300°C
wwwP.DIaNtaShCeOet4UN.cFomIGURATION
TOP VIEW
SEL 1
VCC 2
OUT1 3
OUT2 4
RST 5
10 ADJ1
9 ADJ2
11 8 TMR
7 REF
6 GND
DDB PACKAGE
10-LEAD (3mm × 2mm) PLASTIC DFN
TJMAX = 150°C, θJA = 76°C/W
EXPOSED PAD (PIN 11) MAY BE LEFT OPEN OR TIED TO GND
SEL 1
VCC 2
OUT1 3
OUT2 4
RST 5
TOP VIEW
10 ADJ1
9 ADJ2
8 TMR
7 REF
6 GND
MS PACKAGE
10-LEAD PLASTIC MSOP
TJMAX = 150°C, θJA = 120°C/W
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC2919CDDB-2.5#PBF LTC2919CDDB-2.5#TRPBF LDGT
10-Lead (3mm × 2mm) Plastic DFN 0°C to 70°C
LTC2919IDDB-2.5#PBF
LTC2919HDDB-2.5#PBF
LTC2919CDDB-3.3#PBF
LTC2919IDDB-2.5#TRPBF
LTC2919HDDB-2.5#TRPBF
LTC2919CDDB-3.3#TRPBF
LDGT
LDGT
LDMW
10-Lead (3mm × 2mm) Plastic DFN
10-Lead (3mm × 2mm) Plastic DFN
10-Lead (3mm × 2mm) Plastic DFN
–40°C to 85°C
–40°C to 125°C
0°C to 70°C
LTC2919IDDB-3.3#PBF LTC2919IDDB-3.3#TRPBF LDMW
10-Lead (3mm × 2mm) Plastic DFN –40°C to 85°C
LTC2919HDDB-3.3#PBF LTC2919HDDB-3.3#TRPBF LDMW
LTC2919CDDB-5#PBF LTC2919CDDB-5#TRPBF LDMX
10-Lead (3mm × 2mm) Plastic DFN
10-Lead (3mm × 2mm) Plastic DFN
–40°C to 125°C
0°C to 70°C
LTC2919IDDB-5#PBF LTC2919IDDB-5#TRPBF
LDMX
10-Lead (3mm × 2mm) Plastic DFN –40°C to 85°C
LTC2919HDDB-5#PBF
LTC2919CMS-2.5#PBF
LTC2919HDDB-5#TRPBF
LTC2919CMS-2.5#TRPBF
LDMX
LTDGS
10-Lead (3mm × 2mm) Plastic DFN
10-Lead Plastic MSOP
–40°C to 125°C
0°C to 70°C
LTC2919IMS-2.5#PBF LTC2919IMS-2.5#TRPBF LTDGS
10-Lead Plastic MSOP
–40°C to 85°C
LTC2919HMS-2.5#PBF LTC2919HMS-2.5#TRPBF LTDGS
10-Lead Plastic MSOP
–40°C to 125°C
LTC2919CMS-3.3#PBF LTC2919CMS-3.3#TRPBF LTDMT
10-Lead Plastic MSOP
0°C to 70°C
LTC2919IMS-3.3#PBF LTC2919IMS-3.3#TRPBF LTDMT
10-Lead Plastic MSOP
–40°C to 85°C
LTC2919HMS-3.3#PBF LTC2919HMS-3.3#TRPBF LTDMT
10-Lead Plastic MSOP
–40°C to 125°C
LTC2919CMS-5#PBF
LTC2919CMS-5#TRPBF
LTDMV
10-Lead Plastic MSOP
0°C to 70°C
LTC2919IMS-5#PBF
LTC2919IMS-5#TRPBF
LTDMV
10-Lead Plastic MSOP
–40°C to 85°C
LTC2919HMS-5#PBF
LTC2919HMS-5#TRPBF
LTDMV
10-Lead Plastic MSOP
–40°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *Temperature grades are identified by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
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LTC2919
ELECTRICAL CHARACTERISTICS The denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VCC = 2.5V (LTC2919-2.5), VCC = 3.3V (LTC2919-3.3), VCC = 5V
(LTC2919-5), ADJ1 = ADJ2 = 0.55V, SEL = floating, unless otherwise noted. (Note 2)
SYMBOL
VCC(MIN)
VCC(SHUNT)
ICC
VRT
PARAMETER
Operating Supply Voltage
VCC Shunt Regulation Voltage
VCC Input Current
ADJ Input Threshold
CONDITIONS
RST, OUT1, OUT2 in Correct State
ICC = 1mA, IREF = 0
2.175V < VCC < 6V (C-Grade, I-Grade)
2.175V < VCC < 6V (H-Grade)
ΔVRT ADJ Hysteresis (Note 4)
IADJ ADJ Input Current
www.DataSheet4U.com
VCC(UVLO)
VCC –10% UVLO Threshold
ΔVCC(UVLO)
VREF
UVLO Hysteresis (Note 4)
Buffered Reference Voltage
TMR = VCC
VADJ = 0.55V (C-Grade, I-Grade)
VADJ = 0.55V (H-Grade)
LTC2919-2.5
LTC2919-3.3
LTC2919-5
TMR = VCC
VCC > 2.175V, IREF = ±1mA
ITMR(UP)
ITMR(DOWN)
tRST(EXT)
tRST(INT)
VTMR(DIS)
TMR Pull-Up Current
TMR Pull-Down Current
Reset Timeout Period, External
Reset Timeout Period, Internal
Timer Disable Voltage
VTMR = 1V
VTMR = 1V
CTMR = 2.2nF
VTMR = 0V
VTMR Rising
ΔVTMR(DIS)
VTMR(INT)
ΔVTMR(INT)
tPROP
tUV
VOL
Timer Disable Hysteresis
Timer Internal Mode Voltage
Timer Internal Mode Hysteresis
ADJx Comparator Propagation Delay to
OUTX
VCC Undervoltage Detect to RST
Output Voltage Low
IOH Output Voltage High Leakage
Three-State Input SEL
VIL Low Level Input Voltage
VIH High Level Input Voltage
VZ Pin Voltage when Left in Open State
VTMR Falling
VTMR Falling
VTMR Rising
ADJx Driven Beyond Threshold (VRTX) by
5mV
VCC Less Than UVLO Threshold
(VCC(UVLO)) by 1%
VCC = 0.5V, I = 5μA
VCC = 1V, I = 100μA
VCC = 3V, I = 2500μA
Output = VCC (C-Grade, I-Grade)
Output = VCC (H-Grade)
ISEL = 0μA
MIN
0.5
6.0
495.0
492.5
1.5
2.175
2.871
4.350
0.3
0.990
0.985
–1.5
1.5
15
140
VCC
– 0.40
40
0.10
40
50
50
0
0
0
0
1.4
0.8
TYP
6.5
50
50
500
500
3.5
0
0
2.213
2.921
4.425
0.7
1.000
1.000
–2.2
2.2
20
200
VCC
– 0.20
100
0.20
100
150
150
0.01
0.01
0.10
0
0
0.9
MAX
7.1
220
280
505.0
507.5
10.0
±15
±40
2.250
2.970
4.500
2.0
1.010
1.015
–2.9
2.9
27
280
VCC
– 0.10
160
0.40
160
800
800
0.15
0.15
0.30
±1
±5
0.4
VCC
1.0
UNITS
V
V
μA
μA
mV
mV
mV
nA
nA
V
V
V
%
V
V
μA
μA
ms
ms
V
mV
V
mV
μs
μs
V
V
V
μA
μA
V
V
V
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LTC2919
ELECTRICAL CHARACTERISTICS The denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VCC = 2.5V (LTC2919-2.5), VCC = 3.3V (LTC2919-3.3), VCC = 5V
(LTC2919-5), ADJ1 = ADJ2 = 0.55V, SEL = floating, unless otherwise noted. (Note 2)
SYMBOL
ISEL(Z)
ISEL
PARAMETER
Allowable Leakage When Open
SEL Input Current
CONDITIONS
SEL = VCC or SEL = GND
MIN TYP MAX UNITS
±5 μA
±17 ±25
μA
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: All currents into pins are positive; all voltages are referenced to
GND unless otherwise noted.
wwwN.oDteat3a:SVhCeCemt4axUi.mcuommpin voltage is limited by input current. Since the
VCC pin has an internal 6.5V shunt regulator, a low impedance supply
which exceeds 6V may exceed the rated terminal current. Operation
from higher voltage supplies requires a series dropping resistor. See
Applications Information.
Note 4: Threshold voltages have no hysteresis unless the part is in
comparator mode. Hysteresis is one-sided, affecting only invalid-to-valid
transitions. See Applications Information.
TYPICAL PERFOR A CE CHARACTERISTICS TA = 25°C unless otherwise noted.
ADJ Threshold Voltage
vs Temperature
508
506
504
502
500
498
496
494
492
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
2919 G01
VCC UVLO Threshold Variation
vs Temperature
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
2919 G02
REF Output Voltage
vs Temperature
1.015
IREF = 0A
1.010
1.005
1.000
0.995
0.990
0.985
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
2919 G03
REF Output Load Regulation
0.6
VCC = 2.5V
0.4
TA = 150°C
0.2
TA = 25°C
0.0
TA = 125°C
–0.2 TA = –40°C
–0.4
REF Output Line Regulation
0.6
IREF = 0A
0.4
TA = 150°C
0.2
0.0
TA = 125°C
–0.2
–0.4
TA = 25°C
TA = –40°C
Quiescent Supply Current
vs Temperature
90
ADJ1 = 0.55V
80
ADJ2 = 0.45V
SEL = OPEN
70
VCC = 5V
60
VCC = 3.3V
50
VCC = 2.5V
40
30
–0.6
–1
–0.5 0
0.5
LOAD CURRENT (mA)
1
2919 G04
–0.6
2
34 5
SUPPLY VOLTAGE (V)
6
2919 G05
20
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
2919 G06
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LTC2919
TYPICAL PERFOR A CE CHARACTERISTICS TA = 25°C unless otherwise noted.
Propagation Delay vs Overdrive
700
Reset Timeout Period
vs Capacitance
10000
Reset Timeout Period
vs Temperature
260
600
500
400
300
200
www.Dat1a00Sheet4U.com
0
0.1 1
10 100
GLITCH PERCENTAGE PAST THRESHOLD (%)
2919 G07
1000
100
10
1
0.1 1
10 100 1000
TMR PIN CAPACITANCE, CTMR (nF)
2919 G08
240
INTERNAL
220
200
EXTERNAL, CTMR = 22nF
180
160
140
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
2919 G09
Shunt Regulation Voltage
vs Temperature
7.0
6.8
ICC = 10mA
6.6
ICC = 1mA
6.4
ICC = 100μA
6.2
Shunt Regulation Voltage
vs Supply Current
7.6
TA = 25°C
7.2
6.8
6.4
OUT1, OUT2, RST Output Voltage
vs VCC
5
ADJ1 = 0.55V
ADJ2 = 0.45V
4 SEL = OPEN
10k PULL-UP R TO VCC
3
2
LTC2919-2.5
1
LTC2919-3.3
LTC2919-5
6.0
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
2919 G10
OUT1, OUT2, RST Output Voltage
vs VCC
0.4
0.3
VCC
0.2
WITH 10k PULL-UP
0.1
WITH 100k PULL-UP
0
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8
SUPPLY VOLTAGE, VCC (V)
2919 G13
6.0
0.01
0.1 1
10
SUPPLY CURRENT, ICC (mA)
100
2919 G11
OUT1, OUT2, RST Pull-Down
Current vs VCC
6
ADJ1 = 0.45V
ADJ2 = 0.55V
5 SEL = OPEN
4
OUTPUT AT 150mV
3
0
01 2 345
SUPPLY VOLTAGE, VCC (V)
2919 G12
OUT1, OUT2, RST Pull-Down
Current vs VCC
1
OUTPUT AT 150mV
0.1
OUTPUT AT 50mV
0.01
2
0.001
1 OUTPUT AT 50mV
0
01 2 3 4
SUPPLY VOLTAGE, VCC (V)
0.0001
5 0 0.2 0.4 0.6 0.8 1
SUPPLY VOLTAGE, VCC (V)
2919 G14
2919 G15
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