LTC2960
36V Nano-Current
Two-Input Voltage Monitor
FeaTures
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DescripTion
The
LTC
®
2960
is a nano-current, high voltage two-input
voltage monitor, ideally suited for multicell battery ap-
plications. External resistive dividers configure custom
comparator thresholds. The supervisory circuit monitors
the ADJ input and pulls the
RST
output low when the input
drops below threshold. A reset timeout period delays the
return of the
RST
output to a high state when the input
rises above the threshold. The spare comparator allows
voltage conditions to be detected with either a non-inverting
input, IN
+
(LTC2960-1/LTC2960-3) or an inverting input,
IN
–
(LTC2960-2/LTC2960-4). A manual reset (MR) input
is provided for external activation of the reset output.
Other options provided on the LTC2960-1/LTC2960-2 in-
clude a reset timeout period select pin, RT, to select between
15ms or 200ms reset timeout periods. The LTC2960-3/
LTC2960-4 have a fixed 200ms reset timeout period. The
RST
and OUT outputs are available with active pull-up cir-
cuits to an output logic supply pin (LTC2960-3/LTC2960-4)
or 36V open-drain outputs (LTC2960-1/LTC2960-2).
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.
850nA Quiescent Current
Operating Range: 2.5V < V
CC
< 36V
1.5% (Max) Accuracy Over Temperature
Adjustable Reset Threshold
Wide Temperature Range (–40°C to 125°C)
Adjustable IN
+
/IN
–
Threshold
Manual Reset Input
Compact 2mm
×
2mm 8-lead DFN and
TSOT-23 (ThinSOT™) Packages
applicaTions
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Portable Equipment
Battery Powered Equipment
Security Systems
Automotive Systems
Inputs
ADJ/IN
+
ADJ/IN
–
ADJ/IN
+
ADJ/IN
–
Reset Timeout Period
15ms/200ms
15ms/200ms
200ms
200ms
Output Type
36V Open-Drain
36V Open-Drain
Active Pull-Up
Active Pull-Up
LTC2960 Option Table
Option
LTC2960-1
LTC2960-2
LTC2960-3
LTC2960-4
Typical applicaTion
Battery and Regulator Monitor
6V < V
IN
< 8.4V
Li-Ion
4.2V
1200
LTC3632
DC/DC
GND
LTC2960-3
DV
CC
V
CC
IN
+
Li-Ion
4.2V
RST
OUT
ADJ
RESET
LOW BATTERY
R3
402k
2960 TA01
Supply Current vs Supply Voltage
V
OUT
1.8V
R4
1.3M
I
CC
(nA)
C2
1µF
900
MR=5V,
27C
+
C1
0.1µF
50V
R2
6.04M
600
+
R1
402k
MR
GND
300
0
0
8
POWER-FAIL FALLING THRESHOLD = 6.410V
RESET FALLING THRESHOLD = 1.693V
16
24
V
CC
(V)
32
40
2960 TA01a
2960fa
For more information
www.linear.com/LTC2960
1
LTC2960
absoluTe MaxiMuM raTings
(Notes 1 & 2)
Input Voltages
V
CC
, RT,
MR
.......................................... –0.3V to 40V
DV
CC
........................................................ –0.3V to 6V
ADJ, IN
+
, IN
–
......................................... –0.3V to 3.5V
Output Voltages (LTC2960-1/LTC2960-2)
RST,
OUT ............................................... –0.3V to 40V
Output Voltages (LTC2960-3/LTC2960-4)
RST,
OUT (DV
CC
≥ 1.6V) ......... –0.3V to (DV
CC
+ 0.3V)
RST,
OUT (DV
CC
= GND) ....................... –0.3V to 6.3V
Average Currents
RST,
OUT ...........................................................±5mA
Operating Ambient Temperature Range
LTC2960C ................................................ 0°C to 70°C
LTC2960I .............................................–40°C to 85°C
LTC2960H .......................................... –40°C to 125°C
Storage Temperature Range .................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec)
TSOT-23 Package ............................................. 300°C
pin conFiguraTion
TOP VIEW
V
CC
1
RT/DV
CC
2
RST
3
OUT 4
9
8 IN
+
/IN
–
7 ADJ
6
MR
5 GND
IN
+
/IN
–
ADJ
MR
GND
1
2
3
4
TOP VIEW
8
7
6
5
V
CC
RT/DV
CC
RST
OUT
DC8 PACKAGE
8-LEAD (2mm
×
2mm) PLASTIC DFN
T
JMAX
= 150°C,
q
JA
= 80.6°C/W
EXPOSED PAD (PIN 9) PCB GND
CONNECTION OPTIONAL
TS8 PACKAGE
8-LEAD PLASTIC TSOT-23
T
JMAX
= 150°C,
q
JA
= 195°C/W
orDer inForMaTion
Lead Free Finish
TAPE AND REEL (MINI)
LTC2960CDC-1#TRMPBF
LTC2960IDC-1#TRMPBF
LTC2960HDC-1#TRMPBF
LTC2960CDC-2#TRMPBF
LTC2960IDC-2#TRMPBF
LTC2960HDC-2#TRMPBF
LTC2960CDC-3#TRMPBF
LTC2960IDC-3#TRMPBF
LTC2960HDC-3#TRMPBF
LTC2960CDC-4#TRMPBF
LTC2960IDC-4#TRMPBF
LTC2960HDC-4#TRMPBF
TAPE AND REEL
LTC2960CDC-1#TRPBF
LTC2960IDC-1#TRPBF
LTC2960HDC-1#TRPBF
LTC2960CDC-2#TRPBF
LTC2960IDC-2#TRPBF
LTC2960HDC-2#TRPBF
LTC2960CDC-3#TRPBF
LTC2960IDC-3#TRPBF
LTC2960HDC-3#TRPBF
LTC2960CDC-4#TRPBF
LTC2960IDC-4#TRPBF
LTC2960HDC-4#TRPBF
PART MARKING
LFZZ
LFZZ
LFZZ
LGBC
LGBC
LGBC
LFSF
LFSF
LFSF
LGBF
LGBF
LGBF
PACKAGE DESCRIPTION
8-Lead (2mm × 2mm) Plastic DFN
8-Lead (2mm × 2mm) Plastic DFN
8-Lead (2mm × 2mm) Plastic DFN
8-Lead (2mm × 2mm) Plastic DFN
8-Lead (2mm × 2mm) Plastic DFN
8-Lead (2mm × 2mm) Plastic DFN
8-Lead (2mm × 2mm) Plastic DFN
8-Lead (2mm × 2mm) Plastic DFN
8-Lead (2mm × 2mm) Plastic DFN
8-Lead (2mm × 2mm) Plastic DFN
8-Lead (2mm × 2mm) Plastic DFN
8-Lead (2mm × 2mm) Plastic DFN
TEMPERATURE RANGE
0°C to 70°C
–40°C to 85°C
–40°C to 125°C
0°C to 70°C
–40°C to 85°C
–40°C to 125°C
0°C to 70°C
–40°C to 85°C
–40°C to 125°C
0°C to 70°C
–40°C to 85°C
–40°C to 125°C
2
2960fa
For more information
www.linear.com/LTC2960
LTC2960
orDer inForMaTion
Lead Free Finish
TAPE AND REEL (MINI)
LTC2960ITS8-1#TRMPBF
TAPE AND REEL
LTC2960ITS8-1#TRPBF
PART MARKING
LTFZY
LTFZY
LTFZY
LTGBB
LTGBB
LTGBB
LTFSD
LTFSD
LTFSD
LTGBD
LTGBD
LTGBD
PACKAGE DESCRIPTION
8-Lead Plastic TSOT-23
8-Lead Plastic TSOT-23
8-Lead Plastic TSOT-23
8-Lead Plastic TSOT-23
8-Lead Plastic TSOT-23
8-Lead Plastic TSOT-23
8-Lead Plastic TSOT-23
8-Lead Plastic TSOT-23
8-Lead Plastic TSOT-23
8-Lead Plastic TSOT-23
8-Lead Plastic TSOT-23
8-Lead Plastic TSOT-23
TEMPERATURE RANGE
0°C to 70°C
–40°C to 85°C
–40°C to 125°C
0°C to 70°C
–40°C to 85°C
–40°C to 125°C
0°C to 70°C
–40°C to 85°C
–40°C to 125°C
0°C to 70°C
–40°C to 85°C
–40°C to 125°C
LTC2960CTS8-1#TRMPBF LTC2960CTS8-1#TRPBF
LTC2960HTS8-1#TRMPBF LTC2960HTS8-1#TRPBF
LTC2960CTS8-2#TRMPBF LTC2960CTS8-2#TRPBF
LTC2960ITS8-2#TRMPBF
LTC2960ITS8-2#TRPBF
LTC2960HTS8-2#TRMPBF LTC2960HTS8-2#TRPBF
LTC2960CTS8-3#TRMPBF LTC2960CTS8-3#TRPBF
LTC2960ITS8-3#TRMPBF
LTC2960ITS8-3#TRPBF
LTC2960HTS8-3#TRMPBF LTC2960HTS8-3#TRPBF
LTC2960CTS8-4#TRMPBF LTC2960CTS8-4#TRPBF
LTC2960ITS8-4#TRMPBF
LTC2960ITS8-4#TRPBF
LTC2960HTS8-4#TRMPBF LTC2960HTS8-4#TRPBF
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on nonstandard 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/
The
l
denotes specifications that apply over the full operating temperature
range, otherwise specifications are at T
A
= 25°C, V
CC
= 7V, DV
CC
= 3.3V unless otherwise noted (Note 2).
SYMBOL PARAMETER
V
CC
V
UVLO
I
CC
DV
CC
I
DVCC
V
TH
V
THM
V
RHYS
V
+HYS
V
–HYS
t
UV
I
TH(LKG)
V
CC
Input Supply Operating Range
V
CC
Undervoltage Lockout
V
CC
Undervoltage Lockout Hysteresis
V
CC
Input Supply Current
DV
CC
Input Supply Operating Range
DV
CC
Input Current
ADJ/IN
+
Input Threshold
IN
–
Input Threshold
ADJ to IN
+
/IN
–
Threshold Matching
ADJ Threshold Hysteresis
IN
+
Threshold Hysteresis
IN
–
Threshold Hysteresis
Under Voltage Detect to
RST,
OUT Falling
Input Leakage Current
Monitored Voltage Rising
Monitored Voltage Rising
Monitored Voltage Falling
V = V
TH
– 40mV
V = 420mV, –40°C ≤ T
A
≤ 85°C
V = 420mV, –40°C ≤ T
A
≤ 125°C
RST
= OUT = LOW DV
CC
= 5.5V
Monitored Voltage Falling
Monitored Voltage Rising
V
CC
Rising
MR
= 5V, V
CC
= 36V, –40°C ≤ T
A
≤ 85°C
MR
= 5V, V
CC
= 36V, –40°C ≤ T
A
≤ 125°C
CONDITIONS
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elecTrical characTerisTics
MIN
2.5
1.85
400
400
1.6
TYP
MAX
36
2.3
1250
2000
5.5
±50
UNITS
V
V
mV
nA
nA
V
nA
mV
mV
mV
mV
mV
mV
µs
nA
nA
100
850
850
THRESHOLD ADJUSTMENT INPUTS: ADJ, IN
+
/IN
–
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394
394
8
18
18
80
400
400
±2
10
20
20
170
±0.1
±0.1
406
406
±6
15
25
25
500
±1
±10
2960fa
For more information
www.linear.com/LTC2960
3
LTC2960
elecTrical characTerisTics
SYMBOL PARAMETER
CONTROL INPUTS:
MR,
RT
V
RT
V
MR
t
PW
t
PD
V
MR
I
MR
I
LK
Control Input Threshold RT
Control Input Threshold
MR
MR
Minimum Detectable Pulse Width
Propagation Delay to
RST
Falling
Manual Reset Open Voltage
Manual Reset Low Current
Input Leakage Current
Manual Reset Falling
MR
Open,
MR
Load = 100nA
MR
= 400mV, V
CC
≥ 2.5V
RT = 15V
MR
= 15V
V
CC
= 1.2V, I = 10µA (LTC2960-1/LTC2960-3)
V
CC
= 3V, I = 500µA
I = –100µA (LTC2960-3/LTC2960-4)
V = 5.5V
V = 15V (LTC2960-1/LTC2960-2)
V = 5.5V, DV
CC
= GND
RST
= GND DV
CC
= 6V (LTC2960-3/ LTC2960-4)
OUT = GND DV
CC
= 6V (LTC2960-3/ LTC2960-4)
LTC2960-3/LTC2960-4
RT Input High
RT Input Low
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l
l
The
l
denotes specifications that apply over the full operating temperature
range, otherwise specifications are at T
A
= 25°C, V
CC
= 7V, DV
CC
= 3.3V unless otherwise noted (Note 2).
CONDITIONS
MIN
0.4
0.4
20
1
2.6
–0.35
–1
7
20
4
–3
±100
±100
25
100
0.7•DV
CC
±50
±100
±50
0.8
0.8
140
140
10
200
200
15
3
3
280
280
25
100
400
TYP
MAX
1.4
1.4
UNITS
V
V
µs
µs
V
µA
nA
nA
mV
mV
V
nA
nA
nA
mA
mA
ms
ms
ms
STATUS OUTPUTS:
RST,
OUT
V
OL
V
OH
I
OH
I
SC
t
RST
Voltage Output Low
Voltage Output High
Leakage Current, Output High
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l
l
l
Output Short-Circuit Current
Reset Timeout Period
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.
Typical perForMance characTerisTics
Supply Current vs Supply Voltage
1500
125°C
MR
CURRENT (µA)
90°C
I
CC
(nA)
900
27°C
600
–45°C
1.2
V
CC
= 7V
1.0
MR
CURRENT (µA)
0.8
0.6
0.4
0.2
0
V
CC
= 2.5V
2.0
V
CC
= 7V
MR
Current vs
MR
Voltage
2.5
Supply Current vs
MR
Voltage
1200
1.5
1.0
V
CC
= 2.5V
0.5
300
0
0
8
16
24
V
CC
(V)
32
40
2960 G01
0
1
2
3
MR
VOLTAGE (V)
4
5
2960 G02
0
0
1
2
3
MR
VOLTAGE (V)
4
5
2960 G03
4
2960fa
For more information
www.linear.com/LTC2960
LTC2960
Typical perForMance characTerisTics
MR
Rising Threshold/Open
Voltage vs V
CC
RISING THRESHOLD/OPEN VOLTAGE (V)
NORMALIZED RESET TIME PERIOD
2.4
MR
OPEN VOLTAGE 27°C
1.9
Normalized Reset Timeout Period
vs Temperature
1.3
1.2
1.1
1.0
0.9
0.8
0.7
–50
GLITCH DURATION (ms)
3.0
V
CC
= 7V
4.0
Comparator Overvoltage/
Undervoltage Glitch Immunity
ADJ/IN
+
/IN
–
V
CC
= 7V
2.0
1.4
MR
INPUT THRESHOLD 27°C
0.9
1.0
0.4
2.5
3.0
3.5
4.0
V
CC
(V)
4.5
5.0
2960 G04
–25
0
25
50
75
TEMPERATURE (°C)
100
125
0.0
0.1
1
10
COMPARATOR OVERDRIVE (%)
100
2960 G06
2960 G05
ADJ, IN
+
, IN
–
Threshold
vs Temperature
430
420
410
V
TH
(mV)
400
390
380
V
–HYS
V
+HYS
V
RHYS
V
OH
(V)
V
TH
3.5
3.0
2.5
2.0
1.5
1.0
0.5
–25
0
25
50
75
TEMPERATURE (°C)
100
125
0
Voltage Output HIGH vs
Pull-Down Current (RST/OUT)
125°C
90°C
27°C
–45°C
370
–50
V
CC
=7V
DV
CC
=3.3V
0
–0.2
–0.4
–0.6
PULL-DOWN CURRENT(mA)
–0.8
2960 G08
2960 G07
Voltage Output LOW vs
Pull-Up Current (RST/OUT)
2.0
125°C
90°C
27°C
–45°C
2.0
Voltage Output HIGH vs
Pull-Down Current (RST/OUT)
125°C
90°C
27°C
–45°C
1.6
1.6
V
OH
(V)
V
OL
(V)
1.2
1.2
0.8
0.8
0.4
0.4
0
V
CC
=7V
DV
CC
=3.3V
0
1
2
3
4
PULL-UP CURRENT (mA)
5
2960 G09
0
V
CC
=7V
DV
CC
=1.6V
0
–20
–40
–60
PULL-DOWN CURRENT(µA)
–80
2960 G08
2960fa
For more information
www.linear.com/LTC2960
5
嵌入式系统
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