LTC2919
Precision Triple/Dual Input
UV, OV and Negative
Voltage Monitor
FEATURES
■
■
■
■
DESCRIPTIO
■
■
■
■
■
■
■
■
■
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 V
CC
= 0.5V
Space Saving 10-Lead 3mm
×
2mm DFN and MSOP
Packages
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.
APPLICATIO S
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■
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Desktop and Notebook Computers
Network Servers
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
Combinations
453k
ADJ1
10.7k
REF
ADJ2
76.8k
SEL
GND
2919 TA01a
3.3V
V
CC
LTC2919–2.5
OUT1
OUT2
RST
TMR
UV
OV
10k
10k
10k
FAULT
0.1μF
POLARITY
ADJ1
ADJ2
SEL PIN
V
CC
OPEN
GND
+
+
–
U
+
–
–
2919f
U
U
1
LTC2919
ABSOLUTE
AXI U RATI GS
Terminal Voltages
V
CC
(Note 3)............................................. –0.3V to 6V
OUT1, OUT2,
RST
................................. –0.3V to 7.5V
ADJ1, ADJ2 .......................................... –0.3V to 7.5V
TMR, SEL..................................–0.3V to (V
CC
+ 0.3V)
Terminal Currents
I
CC
(Note 3)......................................................±10mA
I
REF
....................................................................±1mA
PIN CONFIGURATION
TOP VIEW
SEL 1
V
CC
2
OUT1 3
OUT2 4
RST 5
11
10 ADJ1
9
8
7
6
ADJ2
TMR
REF
GND
SEL
V
CC
OUT1
OUT2
RST
1
2
3
4
5
TOP VIEW
10
9
8
7
6
ADJ1
ADJ2
TMR
REF
GND
DDB PACKAGE
10-LEAD (3mm × 2mm) PLASTIC DFN
T
JMAX
= 150°C,
θ
JA
= 76°C/W
EXPOSED PAD (PIN 11) MAY BE LEFT OPEN OR TIED TO GND
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
LTC2919IDDB-2.5#TRPBF
LDGT
10-Lead (3mm
×
2mm) Plastic DFN
–40°C to 85°C
LTC2919HDDB-2.5#PBF LTC2919HDDB-2.5#TRPBF
LDGT
10-Lead (3mm
×
2mm) Plastic DFN
–40°C to 125°C
LTC2919CDDB-3.3#PBF
LTC2919CDDB-3.3#TRPBF
LDMW
10-Lead (3mm
×
2mm) Plastic DFN
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
10-Lead (3mm
×
2mm) Plastic DFN
–40°C to 125°C
LTC2919CDDB-5#PBF
LTC2919CDDB-5#TRPBF
LDMX
10-Lead (3mm
×
2mm) Plastic DFN
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
LTC2919HDDB-5#TRPBF
LDMX
10-Lead (3mm
×
2mm) Plastic DFN
–40°C to 125°C
LTC2919CMS-2.5#PBF
LTC2919CMS-2.5#TRPBF
LTDGS
10-Lead Plastic MSOP
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/
2919f
2
U
W W
W
(Notes 1, 2)
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
MS PACKAGE
10-LEAD PLASTIC MSOP
T
JMAX
= 150°C,
θ
JA
= 120°C/W
LTC2919
ELECTRICAL CHARACTERISTICS
SYMBOL
V
CC(MIN)
V
CC(SHUNT)
I
CC
V
RT
ΔV
RT
I
ADJ
V
CC(UVLO)
PARAMETER
Operating Supply Voltage
V
CC
Shunt Regulation Voltage
V
CC
Input Current
ADJ Input Threshold
●
The
●
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 2.5V (LTC2919-2.5), V
CC
= 3.3V (LTC2919-3.3), V
CC
= 5V
(LTC2919-5), ADJ1 = ADJ2 = 0.55V, SEL = floating, unless otherwise noted. (Note 2)
CONDITIONS
RST,
OUT1, OUT2 in Correct State
I
CC
= 1mA, I
REF
= 0
2.175V < V
CC
< 6V (C-Grade, I-Grade)
2.175V < V
CC
< 6V (H-Grade)
●
●
●
●
MIN
0.5
6.0
TYP
6.5
50
50
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
V
CC
– 0.10
160
0.40
160
800
800
0.15
0.15
0.30
±1
±5
0.4
V
CC
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
495.0
492.5
1.5
500
500
3.5
0
0
ADJ Hysteresis (Note 4)
ADJ Input Current
V
CC
–10% UVLO Threshold
TMR = V
CC
V
ADJ
= 0.55V (C-Grade, I-Grade)
V
ADJ
= 0.55V (H-Grade)
LTC2919-2.5
LTC2919-3.3
LTC2919-5
TMR = V
CC
V
CC
> 2.175V, I
REF
= ±1mA
●
●
●
●
●
●
2.175
2.871
4.350
0.3
0.990
0.985
–1.5
1.5
15
140
V
CC
– 0.40
40
0.10
40
50
50
0
0
0
2.213
2.921
4.425
0.7
1.000
1.000
–2.2
2.2
20
200
V
CC
– 0.20
100
0.20
100
150
150
0.01
0.01
0.10
0
0
ΔV
CC(UVLO)
V
REF
I
TMR(UP)
I
TMR(DOWN)
t
RST(EXT)
t
RST(INT)
V
TMR(DIS)
ΔV
TMR(DIS)
V
TMR(INT)
ΔV
TMR(INT)
t
PROP
t
UV
V
OL
UVLO Hysteresis (Note 4)
Buffered Reference Voltage
TMR Pull-Up Current
TMR Pull-Down Current
Reset Timeout Period, External
Reset Timeout Period, Internal
Timer Disable Voltage
Timer Disable Hysteresis
Timer Internal Mode Voltage
Timer Internal Mode Hysteresis
ADJx Comparator Propagation Delay to
OUT
X
V
CC
Undervoltage Detect to
RST
Output Voltage Low
V
TMR
= 1V
V
TMR
= 1V
C
TMR
= 2.2nF
V
TMR
= 0V
V
TMR
Rising
V
TMR
Falling
V
TMR
Falling
V
TMR
Rising
ADJx Driven Beyond Threshold (V
RTX
) by
5mV
V
CC
Less Than UVLO Threshold
(V
CC(UVLO)
) by 1%
V
CC
= 0.5V, I = 5μA
V
CC
= 1V, I = 100μA
V
CC
= 3V, I = 2500μA
Output = V
CC
(C-Grade, I-Grade)
Output = V
CC
(H-Grade)
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
I
OH
Output Voltage High Leakage
Three-State Input SEL
V
IL
V
IH
V
Z
Low Level Input Voltage
High Level Input Voltage
Pin Voltage when Left in Open State
I
SEL
= 0μA
●
●
0
1.4
0.8
0.9
1.0
2919f
3
LTC2919
ELECTRICAL CHARACTERISTICS
SYMBOL
I
SEL(Z)
I
SEL
PARAMETER
Allowable Leakage When Open
SEL Input Current
SEL = V
CC
or SEL = GND
The
●
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 2.5V (LTC2919-2.5), V
CC
= 3.3V (LTC2919-3.3), V
CC
= 5V
(LTC2919-5), ADJ1 = ADJ2 = 0.55V, SEL = floating, unless otherwise noted. (Note 2)
CONDITIONS
●
●
MIN
TYP
±17
MAX
±5
±25
UNITS
μA
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.
Note 3:
V
CC
maximum pin voltage is limited by input current. Since the
V
CC
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
T
A
= 25°C unless otherwise noted.
THRESHOLD VOLTAGE VARIATION (% OF 25°C VALUE)
ADJ Threshold Voltage
vs Temperature
508
THRESHOLD VOLTAGE, V
RT
(mV)
506
504
502
500
498
496
494
492
–50 –25
0
25 50 75 100 125 150
TEMPERATURE (°C)
2919 G01
0.5
0
–0.5
–1.0
–1.5
–50 –25
REF VOLTAGE, V
REF
(V)
REF Output Load Regulation
0.6
0.4
0.2
0.0
T
A
= 125°C
–0.2
–0.4
–0.6
–1
–0.5
0
0.5
LOAD CURRENT (mA)
1
2919 G04
REF VOLTAGE VARIATION (% OF 2.5V SUPPLY AND 25°C VALUE)
REF VOLTAGE, VARIATION (%OF NO LOAD AND 25°C VALUE)
T
A
= 150°C
T
A
= 150°C
0.4
0.2
0.0
T
A
= 125°C
–0.2
–0.4
–0.6
2
3
4
5
SUPPLY VOLTAGE (V)
6
2919 G05
QUIESCENT SUPPLY CURRENT, I
CC
(μA)
V
CC
= 2.5V
T
A
= 25°C
T
A
= –40°C
4
U W
V
CC
UVLO Threshold Variation
vs Temperature
1.5
1.0
1.015
1.010
1.005
1.000
REF Output Voltage
vs Temperature
I
REF
= 0A
0.995
0.990
0
25 50 75 100 125 150
TEMPERATURE (°C)
2919 G02
0.985
–50 –25
0
25 50 75 100 125 150
TEMPERATURE (°C)
2919 G03
REF Output Line Regulation
0.6
I
REF
= 0A
90
Quiescent Supply Current
vs Temperature
ADJ1 = 0.55V
ADJ2 = 0.45V
80
SEL = OPEN
70
60
50
V
CC
= 2.5V
40
30
20
–50 –25
V
CC
= 5V
V
CC
= 3.3V
T
A
= 25°C
T
A
= –40°C
0
25 50 75 100 125 150
TEMPERATURE (°C)
2919 G06
2919f
LTC2919
TYPICAL PERFOR A CE CHARACTERISTICS
Propagation Delay vs Overdrive
700
600
PROPAGATION DELAY (μs)
500
400
300
200
100
0
0.1
1
10
100
GLITCH PERCENTAGE PAST THRESHOLD (%)
2919 G07
RESET TIMEOUT PERIOD, t
RST
(ms)
RESET TIMEOUT PERIOD, t
RST
(ms)
Shunt Regulation Voltage
vs Temperature
SHUNT REGULATION VOLTAGE, V
CC(SHUNT)
(V)
SHUNT REGULATOR VOLTAGE, V
CC(SHUNT)
(V)
7.0
7.6
6.8
I
CC
= 10mA
6.6
I
CC
= 1mA
6.4
I
CC
= 100μA
6.2
OUTPUT VOLTAGE (V)
6.0
–50 –25
0
25 50 75 100 125 150
TEMPERATURE (°C)
2919 G10
OUT1, OUT2,
RST
Output Voltage
vs V
CC
0.4
OUTPUT PULL-DOWN CURRENT (mA)
6
OUTPUT PULL-DOWN CURRENT (mA)
OUTPUT VOLTAGE (V)
0.3
V
CC
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
SUPPLY VOLTAGE, V
CC
(V)
0.7
0.8
U W
2919 G13
T
A
= 25°C unless otherwise noted.
Reset Timeout Period
vs Temperature
260
240
220
200
EXTERNAL, C
TMR
= 22nF
180
160
140
–50 –25
INTERNAL
Reset Timeout Period
vs Capacitance
10000
1000
100
10
1
0.1
1
10
100
TMR PIN CAPACITANCE, C
TMR
(nF)
1000
2919 G08
0
25 50 75 100 125 150
TEMPERATURE (°C)
2919 G09
Shunt Regulation Voltage
vs Supply Current
T
A
= 25°C
5
OUT1, OUT2,
RST
Output Voltage
vs V
CC
ADJ1 = 0.55V
ADJ2 = 0.45V
4 SEL = OPEN
10k PULL-UP R TO V
CC
3
7.2
6.8
2
LTC2919-2.5
1
LTC2919-3.3
LTC2919-5
6.4
6.0
0.01
0
0.1
1
10
SUPPLY CURRENT, I
CC
(mA)
100
2919 G11
0
1
3
4
2
SUPPLY VOLTAGE, V
CC
(V)
5
2919 G12
OUT1, OUT2,
RST
Pull-Down
Current vs V
CC
ADJ1 = 0.45V
ADJ2 = 0.55V
5 SEL = OPEN
4
OUTPUT AT 150mV
3
2
1
0
0
1
2
3
4
SUPPLY VOLTAGE, V
CC
(V)
5
2919 G14
OUT1, OUT2,
RST
Pull-Down
Current vs V
CC
1
OUTPUT AT 150mV
0.1
OUTPUT AT 50mV
0.01
0.001
OUTPUT AT 50mV
0.0001
0
0.2
0.4
0.6
0.8
SUPPLY VOLTAGE, V
CC
(V)
1
2919 G15
2919f
5
嵌入式系统
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