LT6703 [Linear]
Ultralow Power Quad; 超低功耗四核
Linear 
LTC1443/LTC1444/LTC1445
Ultralow Power Quad
Comparators with Reference
FeaTures
DescripTion
TheLTC®1443/LTC1444/LTC1445areultralowpowerquad
comparators with a built-in reference. The comparators
feature less than 8.5µA supply current over temperature,
an internal reference (1.182V 1ꢀ for LTC1443 or 1.221V
1ꢀ for LTC1444/LTC1445), programmable hysteresis
(LTC1444/LTC1445) and TTL/CMOS output (LTC1443/
LTC1445) that sinks and sources current (open-drain
output for LTC1444). The reference output can drive a
bypass capacitor of up to 0.01µF without oscillation.
n
Ultralow Quiescent Current: 8.5µA Max
n
Reference Output Drives 0.01µF Capacitor
n
Adjustable Hysteresis (LTC1444/LTC1445)
Wide Supply Range
n
Single: 2V to 11V
Dual: 1V to 5.5V
n
Input Voltage Range Includes the Negative Supply
n
TTL/CMOS Compatible Outputs
Propagation Delay: 12µs (Typ) (10mV Overdrive)
No Crowbar Current
40mA Continuous Source Current
Pin Compatible Upgrades for MAX924 (LTC1443)
Low Profile (5mm × 4mm × 0.8mm) DFN Package
n
n
The comparators operate from a single 2V to 11V supply
or a dual 1V to 5.5V supply (LTC1443). Comparator
hysteresisiseasilyprogrammableusingtworesistorsand
the HYST pin (LTC1444/LTC1445). Each comparator’s
input operates from the negative supply to within 1.3V of
the positive supply. The LTC1443/LTC1445 comparator
output stage can continuously source up to 40mA. By
eliminating the cross-conducting current that normally
happenswhenthecomparatorchangeslogicstates,power
supply glitches are eliminated.
n
n
n
applicaTions
n
Battery-Powered System Monitoring
n
Threshold Detectors
n
Window Comparators
Oscillator Circuits
n
The LTC1443/LTC1444/LTC1445 are available in the
16-pin SO, PDIP and DFN packages.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
Typical applicaTion
Reference Settling Test Circuit
Reference Settling
3
+
V
IN
8V
V
+
V
3.4M
1%
5V
TO 8V
5V
+
5
IN A
+
–
2
OUT
V
REF
–
IN A
4
14
HYST
REF
1.21M
1%
R1
10k
LTC1445
8
OUT
144345 TA02
+
2ms/DIV
1.2V
R2
2.4M
R3
430Ω
–
–
V
C1
1.0µF
9
144345 TA01
144345fe
1
LTC1443/LTC1444/LTC1445
(Note 1)
absoluTe MaxiMuM raTings
+
Voltage:
OUT Short-Circuit Duration (V ≤ 5.5V)........Continuous
Power Dissipation.............................................. 500mW
Operating Temperature Range
+
–
–
+
–
V to V , V to GND, GND to V ...........12V to –0.3V
+
+
–
IN , IN , HYST..................(V + 0.3V) to (V – 0.3V)
+
–
REF...................................(V + 0.3V) to (V – 0.3V)
Commercial..............................................0°C to 70°C
Industrial ............................................ –40°C to 85°C
Storage Temperature Range
PDIP, SO............................................–65°C to 150°C
DFN....................................................–65°C to 150°C
Lead Temperature Range (Soldering, 10 sec)
PDIP, SO...........................................................300°C
+
OUT (LTC1443)...............(V + 0.3V) to (GND – 0.3V)
OUT
+
–
(LTC1444/LTC1445)........(V + 0.3V) to (V – 0.3V)
Current:
+
–
IN , IN , HYST ................................................. 20mA
REF................................................................... 20mA
OUT .................................................................. 50mA
pin conFiguraTion
TOP VIEW
TOP VIEW
OUT B
OUT A
1
2
3
4
5
6
7
8
16 OUT C
15 OUT D
OUT B
OUT A
1
2
3
4
5
6
7
8
16 OUT C
15 OUT D
+
†
+
†
V
14
13
12
11
10
9
GND/HYST
V
14 GND/HYST
–
+
–
+
IN A
IN D
IN A
13 IN D
17
+
–
+
–
IN A
IN D
IN A
12 IN D
–
+
–
+
IN B
IN C
IN B
11 IN C
+
–
+
–
IN B
IN C
IN B
10 IN C
–
–
REF
V
REF
9
V
N PACKAGE
S PACKAGE
DHD16 PACKAGE
16-LEAD PDIP
16-LEAD PLASTIC SO
16-LEAD (5mm × 4mm) PLASTIC DFN
T
= 150°C, θ = 90°C/ W (N)
JA
JMAX
T
= 125°C, θ = 41.7°C/ W
JMAX JA
–
T
= 150°C, θ = 150°C/ W (S)
JA
JMAX
EXPOSED PAD (PIN 17) INTERNALLY CONNECTED TO V
†
†
PIN 14 IS GND FOR THE LTC1443
PIN 14 IS GND FOR THE LTC1443
†
†
PIN 14 IS HYST FOR THE LTC1444 AND LTC1445
PIN 14 IS HYST FOR THE LTC1444 AND LTC1445
144345fe
2
LTC1443/LTC1444/LTC1445
orDer inForMaTion
SPECIFIED
PACKAGE DESCRIPTION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
TEMPERATURE RANGE
LTC1443CN#PBF
LTC1443CS#PBF
LTC1443IN#PBF
LTC1443IS#PBF
LTC1444CN#PBF
LTC1444CS#PBF
LTC1444IN#PBF
LTC1444IS#PBF
LTC1445CN#PBF
LTC1445CS#PBF
LTC1445IN#PBF
LTC1445IS#PBF
LTC1443CDHD#PBF
LTC1443IDHD#PBF
LTC1444CDHD#PBF
LTC1444IDHD#PBF
LTC1445CDHD#PBF
LTC1445IDHD#PBF
LTC1443CN#TRPBF
LTC1443CS#TRPBF
LTC1443IN#TRPBF
LTC1443IS#TRPBF
LTC1444CN#TRPBF
LTC1444CS#TRPBF
LTC1444IN#TRPBF
LTC1444IS#TRPBF
LTC1445CN#TRPBF
LTC1445CS#TRPBF
LTC1445IN#TRPBF
LTC1445IS#TRPBF
LTC1443CDHD#TRPBF
LTC1443IDHD#TRPBF
LTC1444CDHD#TRPBF
LTC1444IDHD#TRPBF
LTC1445CDHD#TRPBF
LTC1445IDHD#TRPBF
LTC1443CN
LTC1443CS
LTC1443IN
LTC1443IS
LTC1444CN
LTC1444CS
LTC1444IN
LTC1444IS
LTC1445CN
LTC1445CS
LTC1445IN
LTC1445IS
1443
16-Lead PDIP
0°C to 70°C
16-Lead Plastic SO
0°C to 70°C
16-Lead PDIP
–40°C to 85°C
–40°C to 85°C
0°C to 70°C
16-Lead Plastic SO
16-Lead PDIP
16-Lead Plastic SO
0°C to 70°C
16-Lead PDIP
–40°C to 85°C
–40°C to 85°C
0°C to 70°C
16-Lead Plastic SO
16-Lead PDIP
16-Lead Plastic SO
0°C to 70°C
16-Lead PDIP
–40°C to 85°C
–40°C to 85°C
0°C to 70°C
16-Lead Plastic SO
16-Lead (5mm × 4mm) Plastic DFN
16-Lead (5mm × 4mm) Plastic DFN
16-Lead (5mm × 4mm) Plastic DFN
16-Lead (5mm × 4mm) Plastic DFN
16-Lead (5mm × 4mm) Plastic DFN
16-Lead (5mm × 4mm) Plastic DFN
1443
–40°C to 85°C
0°C to 70°C
1444
1444
–40°C to 85°C
0°C to 70°C
1445
1445
–40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
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/
elecTrical characTerisTics The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. V+ = 5V, V– = GND = 0V, unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Power Supply
+
l
l
V
I
Supply Voltage Range
Supply Current
2.0
11.0
8.5
V
µA
+
–
IN = IN = 80mV
5.5
CC
HYST = REF (LTC1444/LTC1445)
Comparator
l
l
l
l
V
Comparator Input Offset Voltage
V
V
= 2.5V
3.0
0.01
0.02
10.0
1.0
1.0
mV
nA
nA
V
mV/V
mV/V
OS
CM
+
–
+
–
I
Input Leakage Current (IN , IN )
Input Leakage Current (HYST)
Comparator Input Common Mode Range
Common Mode Rejection Ratio
Power Supply Rejection Ratio
Voltage Noise
= V = 2.5V
IN
IN
IN
LTC1444/LTC1445
–
+
V
V
V – 1.3V
1.0
CM
–
+
CMRR
PSRR
Noise
V to (V – 1.3V)
0.1
0.1
20
+
V = 2V to 11V
1.0
100Hz to 100kHz
µV
RMS
l
V
Hysteresis Input Voltage Range
Propagation Delay
LTC1444, LTC1445
Overdrive = 10mV, C
REF – 50mV
REF
V
µs
µs
HYST
t
= 100pF
= 100pF
12
4
PD
OUT
OUT
Overdrive = 100mV, C
144345fe
3
LTC1443/LTC1444/LTC1445
elecTrical characTerisTics The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. V+ = 5V, V– = GND = 0V, unless otherwise noted.
SYMBOL
PARAMETER
Output High Voltage
Output Low Voltage
CONDITIONS
I = –15mA; LTC1443/LTC1445
MIN
V – 0.4V
TYP
MAX
UNITS
+
l
V
V
V
V
V
OH
OL
O
l
l
I = 1.8mA; LTC1443
GND + 0.4V
O
–
I = 1.8mA; LTC1444/LTC1445
V + 0.4V
O
Reference
l
l
l
l
l
V
Reference Voltage
No Load, LTC1443 C Temp Range
I Temp Range
1.170
1.164
1.209
1.203
100
1.182
1.221
200
1.194
1.200
1.233
1.239
V
V
V
V
µA
REF
No Load, LTC1444/ C Temp Range
LTC1445
I Temp Range
I
I
Reference Output Source Current
Reference Output Sink Current
∆V ≤ 1mV
SOURCE
SINK
REF
∆V ≤ 2.5mV
10
10
15
15
µA
µA
REF
∆V ≤ 5mV
l
REF
Noise
Voltage Noise
100Hz to 100kHz
100
µV
RMS
The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C.
V+ = 3V, V– = GND = 0V, unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Power Supply
+
l
l
V
I
Supply Voltage Range
Supply Current
2.0
11.0
8
V
µA
+
–
IN = IN = 80mV, HYST = REF
5
CC
Comparator
l
l
l
l
V
Comparator Input Offset Voltage
V
V
= 1.5V
3.0
0.01
0.02
10.0
1.0
1.0
mV
nA
nA
V
mV/V
mV/V
OS
CM
+
–
+
–
I
Input Leakage Current (IN , IN )
Input Leakage Current (HYST)
Comparator Input Common Mode Range
Common Mode Rejection Ratio
Power Supply Rejection Ratio
Voltage Noise
= V = 1.5V
IN
IN
IN
LTC1444/LTC1445
–
+
V
V
V – 1.3V
1.0
CM
–
+
CMRR
PSRR
Noise
V to (V – 1.3V)
0.1
0.1
100
+
V = 2V to 11V
1.0
100Hz to 100kHz
µV
RMS
l
l
V
Hysteresis Input Voltage Range
Propagation Delay
LTC1444, LTC1445
Overdrive = 10mV, C
REF – 50mV
REF
V
µs
µs
V
V
V
HYST
t
= 100pF
= 100pF
14
5
PD
OUT
OUT
Overdrive = 100mV, C
+
V
V
Output High Voltage
Output Low Voltage
I = –10mA; LTC1443/LTC1445
V – 0.4V
OH
OL
O
l
l
I = 0.8mA; LTC1443
GND + 0.4V
V + 0.4V
O
–
I = 0.8mA; LTC1444/LTC1445
O
Reference
l
l
l
l
l
V
Reference Voltage
No Load, LTC1443 C Temp Range
I Temp Range
1.170
1.164
1.209
1.203
60
1.182
1.221
120
1.194
1.200
1.233
1.239
V
V
V
V
µA
REF
No Load, LTC1444/ C Temp Range
LTC1445
I Temp Range
I
I
Reference Output Source Current
Reference Output Sink Current
∆V ≤ 1mV
SOURCE
SINK
REF
∆V ≤ 2.5mV
10
10
15
15
µA
µA
REF
∆V ≤ 5mV
l
REF
Noise
Noise Voltage
100Hz to 100kHz
100
µV
RMS
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.
144345fe
4
LTC1443/LTC1444/LTC1445
Typical perForMance characTerisTics
LTC1444/LTC1445
Hysteresis Control
Supply Current vs Supply Voltage
Supply Current vs Temperature
5.2
5.0
80
60
40
20
5.8
5.4
5.0
4.6
4.2
3.8
3.4
3.0
+
–
T
= 25°C
IN = (IN + 100mV)
A
–
V
= GND (LTC1443)
+
V
= 5V
–
V = 0V
4.8
4.6
+
–
V
= 5V
0
V = –5V
+
–
V
= 3V
–20
V = 0V
4.4
4.2
4.0
–40
–60
–80
1.0
1.5
2.0
2.5
3.0
10
20
– V
40
0
50
30
(mV)
–60 –40 –20
0
60 80 100 120
20 40
SUPPLY VOLTAGE (V)
V
TEMPERATURE (°C)
REF
HYST
144345 G02
144345 G01
144345 G03
LTC1444/LTC1445 Reference
Voltage vs Temperature
LTC1443 Reference Voltage
vs Temperature
LTC1443 Reference Output
Voltage vs Output Load Current
1.186
1.184
1.182
1.180
1.178
1.176
1.174
1.172
1.170
1.184
1.183
1.182
1.181
1.180
1.179
1.178
1.224
+
+
–
+
–
V
= 5V
V
V
T
= 5V
= GND
= 25°C
V
V
= 5V
= GND
A
1.220
1.216
1.212
SOURCE
1.208
–60 –40 –20
0
20 40 60 80 100 120
0
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
LOAD CURRENT (mA)
–60 –40 –20
0
20 40 60 80 100 120 140
TEMPERATURE (°C)
TEMPERATURE (°C)
144345 G04
144345 G06
144345 G05
LTC1443 Reference Output
Voltage vs Output Load Current
Comparator Output Voltage High
vs Load Current
Comparator Output Voltage Low
vs Load Current
1.194
1.192
1.190
1.188
1.186
1.184
1.182
1.180
2.5
2.0
1.5
1.0
0.5
0
5.0
4.0
3.0
2.0
+
–
V
V
= 5V
= GND
= 25°C
T
= 25°C
A
T
= 25°C
A
T
A
+
V
= 5V
+
+
+
V
= 2V
V
= 3V
V = 5V
SINK
+
V
= 3V
+
V
= 2V
20
1.0
0
10
30
40
50
60
0
10 20 30
40
LOAD CURRENT (mA)
50 60 70 80
0
5
10 15
30 35 40 45
20 25
LOAD CURRENT (µA)
LOAD CURRENT (mA)
144345 G08
144345 G09
144345 G07
144345fe
5
LTC1443/LTC1444/LTC1445
Typical perForMance characTerisTics
Comparator Response Time
vs Input Overdrive
Comparator Response Time
vs Input Overdrive
Comparator Short-Circuit Sink
Current vs Supply Voltage
5
4
3
2
1
0
5
4
3
2
1
0
200
180
160
140
120
100
80
T
= 25°C
T
= 25°C
T
= 25°C
A
A
A
100mV
50mV
10mV
20mV
50mV
100mV
20mV
10mV
+
OUT CONNECTED TO V
60
0
100
0
40
100
20
0
0
1
2
3
4
5
6
7
8
9
10
–1
0
2
8
10
–1
12 14 16 18
4
6
0
2
4
6
8
10
SUPPLY VOLTAGE (V)
RESPONSE TIME (µs)
RESPONSE TIME (µs)
144345 G12
144345 G10
144345 G11
Comparator Short-Circuit Source
Current vs Supply Voltage
Comparator Response Time
vs Load Capacitance
12
10
8
160
140
120
100
80
t
PHL
PLH
OUT CONNECTED TO
–
V
= GND = 0V
t
6
60
40
4
20
2
0
0
20
40
60
80
100
1
2
4
0
5
3
LOAD CAPACITANCE (nF)
SUPPLY VOLTAGE (V)
144345 G14
144345 G13
Supply Current
vs Comparator Input Frequency
Comparator Response Time at
Low Supply Voltage
10000
1000
100
10
10000
1000
100
10
20mV OVERDRIVE
100mV OVERDRIVE
C
= 55pF
OUT
C
= 15pF
OUT
C
= 5pF
OUT
1
1
1
1.1
1.2
1.3
1.4
1.5
1.6
1
10
100
1k
10k
100k
INPUT FREQUENCY (Hz)
SUPPLY VOLTAGE (V)
144345 G15
144345 G16
144345fe
6
LTC1443/LTC1444/LTC1445
pin FuncTions
LTC1443
LTC1444/LTC1445
1
16
15
1
2
16
15
OUT B
OUT C
OUT D
OUT B
OUT A
OUT C
OUT D
2
OUT A
3
+
14
3
14
+
V
GND
V
HYST
–
–
+
+
–
–
+
+
–
–
+
+
–
–
+
+
–
+
+
–
+
4
5
13
12
4
5
13
12
IN A
IN D
IN A
IN D
–
+
–
IN A
IN D
IN A
IN D
–
–
+
+
IN B
IN B
6
7
IN C
11
10
6
7
IN C
11
10
–
–
+
+
IN C
IN C
IN B
IN B
1.2V
1.2V
–
–
8
9
8
9
REF
V
REF
V
+
–
+
–
144345 PF
–
IN C (Pin10): Inverting Input of Comparator C. Input
OUT B (Pin 1): Comparator B Output. (Open-drain output
for LTC1444). Output can source up to 40mA (LTC1443,
LTC1445) and sink 5mA.
–
+
common mode range from V to V – 1.3V. Input current
typically 10pA at 25°C.
+
IN C (Pin 11): Noninverting Input of Comparator C. Input
OUT A (Pin 2): Comparator A Output. (Open-drain output
for LTC1444). Output can source up to 40mA (LTC1443,
LTC1445) and sink 5mA.
–
+
common mode range from V to V – 1.3V. Input current
typically 10pA at 25°C.
–
+
IN D (Pin 12): Inverting Input of Comparator D. Input
V (Pin 3): Positive Supply.
–
+
common mode range from V to V – 1.3V. Input current
typically 10pA at 25°C.
–
IN A (Pin 4): Inverting Input of Comparator A. Input
–
+
common mode range from V to V – 1.3V. Input current
typically 10pA at 25°C.
+
IN D (Pin 13): Noninverting Input of Comparator D. Input
–
+
common mode range from V to V – 1.3V. Input current
typically 10pA at 25°C.
+
IN A (Pin 5): Noninverting Input of Comparator A. Input
–
+
common mode range from V to V – 1.3V. Input current
typically 10pA at 25°C.
–
GND (Pin 14): LTC1443 Ground. Connect to V for single
supply operation.
–
IN B (Pin 6): Inverting Input of Comparator B. Input
HYST (Pin 14): LTC1444/LTC1445 Hysteresis Input. Con-
–
+
common mode range from V to V – 1.3V. Input current
typically 10pA at 25°C.
nect to REF if not used. Input voltage range is from V
REF
to V – 50mV.
REF
+
IN B (Pin 7): Noninverting Input of Comparator B. Input
OUTD(Pin15):ComparatorDOutput.(Open-drainoutput
for LTC1444). Output can source up to 40mA (LTC1443,
LTC1445) and sink 5mA.
–
+
common mode range from V to V – 1.3V. Input current
typically 10pA at 25°C.
–
REF (Pin 8): Reference Output. With respect to V . Can
OUTC(Pin16):ComparatorCOutput. (Open-drainoutput
for LTC1444). Output can source up to 40mA (LTC1443,
LTC1445) and sink 5mA.
source up to 200µA and sink 15µA at 25°C. Drive 0.01µF
bypass capacitor without oscillation.
–
V (Pin 9): Negative Supply. Connect to ground for single
ExposedPad(Pin17,DFNPackage):Thispinisinternally
supply operation on LTC1443.
connected to V–. Connection is optional, but will improve
thermal dissipation.
144345fe
7
LTC1443/LTC1444/LTC1445
applicaTions inForMaTion
The LTC1443/LTC1444/LTC1445 is a family of quad
micropowercomparatorswithabuilt-inreference(1.182V
for the LTC1443 and 1.221V for the LTC1444/LTC1445).
Features include programmable hysteresis (LTC1444/
LTC1445), wide supply voltage range (2V to 11V) and the
abilityofthereferencetodriveuptoa0.01µFcapacitorwith-
out oscillation. The comparator CMOS outputs (LTC1443/
LTC1445) can source up to 40mA while the LTC1444 has
Voltage Reference
Theinternalbandgapreferencehasavoltageof1.182Vfor
LTC1443 or 1.221V for LTC1444/LTC1445 referenced to
–
V . The reference accuracy is 1.5ꢀ from –40°C to 85°C.
It can source up to 200µA and sink up to 15µA with a 5V
supply. Thereferencecandriveabypasscapacitorofupto
0.01µFwithoutoscillationandbyinsertingaseriesresistor,
capacitance values up to 100µF can be used (Figure 1).
–
an open-drain output to V . The supply current glitches
that normally occur when the comparator output switches
states have been eliminated.
REFERENCE
OUTPUT
REF
R1
Power Supplies
LTC144X
The comparator family operates from a single 2V to 11V
supply. The LTC1443 includes a separate ground for the
comparator output stage, allowing a split supply ranging
+
1.2V
C1
–
–
V
–
from 1Vto 5.5V. ConnectingV toGNDontheLTC1443
144345 F01
allows single supply operation. If the comparator output
is required to source more than 1mA or the supply source
Figure 1. Damping the Reference Output
+
impedance is high, V should be bypassed with a 0.1µF
capacitor.
Figure 2 shows the resistor value required for different
capacitor values to achieve critical damping.
Comparator Inputs
The comparator inputs can swing from the negative sup-
1000
100
10
–
ply (V ) to within 1.3V maximum of the positive supply
+
+
–
(V ). The inputs can be forced 300mV below V or above
V without damage, and the typical input leakage current
is only 10pA.
Comparator Outputs
1
The LTC1443 comparator output swings between GND
+
and V to assure TTL compatibility with a split supply.
–
The LTC1444 and LTC1445 outputs swing between V
0.1
0.001
0.01
0.1
1
10
+
and V . The outputs are capable of sourcing up to 40mA
CAPACITOR VALUE (µF)
144345 F02
(LTC1443/LTC1445) and sinking up to 5mA while still
maintaining microampere quiescent currents. The output
stage does not generate crowbar switching currents dur-
ing transitions which helps minimize parasitic feedback
through the supply pins.
Figure 2. Damping Resistance vs Bypass Capacitor Value
144345fe
8
LTC1443/LTC1444/LTC1445
applicaTions inForMaTion
Bypassing the reference can help prevent false tripping of
Hysteresis
+
the comparators by preventing glitches on the V or the
HysteresiscanbeaddedtotheLTC1444/LTC1445bycon-
necting a resistor (R1) between the REF and HYST pins,
and a second resistor (R2) from HYST to V (Figure 4).
reference output voltage. Figure 3 shows the bypassed
+
reference output with a square wave applied to the V pin.
–
Resistors R1 and R2 set 10mV of hysteresis, while R3
damps the reference response. Note that the comparator
output doesn’t trip.
Thedifferencebetweentheupperandlowerthresholdvolt-
ages or hysteresis voltage band (V ) is equal to twice the
HB
voltage difference between the REF and HYST pins. When
more hysteresis is added, the upper threshold increases
the same amount as the lower threshold decreases. The
maximum voltage allowed between REF and HYST is
50mV, producing a maximum hysteresis voltage band of
100mV. If hysteresis is not wanted, the HYST pin should
3
+
V
5V
TO 8V
+
5
4
IN A
+
–
2
OUT
–
IN A
be shorted to REF. Acceptable values for I range from
REF
14 HYST
REF
0.1µA to 5µA. If 2.4M is chosen for R2, then R1(kΩ) =
R1
10k
LTC1445
V
HB
(mV).
8
+
–
1.2V
–
R2
2.4M
R3
V
(2)(I
HB
8
R1 =
R2 =
430Ω
REF
I
REF
)
REF
V
C1
1.0µF
9
R1
R2
LTC1445
V
2
HB
14
HYST
1.221V –
(
)
144345 F03a
I
REF
144345 F04
9
Figure 3a. V+ Glitching Test Circuit
Figure 4. Programmable Hysteresis
8V
5V
+
V
V
REF
OUT
144345 F03b
2ms/DIV
Figure 3b. V+ Glitching Response
144345fe
9
LTC1443/LTC1444/LTC1445
applicaTions inForMaTion
Level Detector
The following design procedure can be used to select the
component values:
The LTC1444 is ideal for use as a multisupply micropower
level detector as shown in Figure 5.
1. Choose the V1 voltage trip level, in this example 4.65V.
2. Calculate the required resistive divider ratio.
R1 and R2 form a voltage divider from V1 to the non-
inverting comparator A input. R6 and R7 are used to
divide down V2, while R8 is the output pull-up resistor
for the comparator outputs. R3 and R4 set the hysteresis
voltage and R5 and C1 bypass the reference output.
Ratio = V /V
REF IN
Ratio = 1.221V/4.65V = 0.263
3. Choosetherequiredhysteresisvoltagebandattheinput,
V
, in this example 60mV. Calculate the hysteresis
HBIN
5V
voltage band referred to the comparator input V .
HB
3
V2
V
V
V
= (V
)(Ratio)
+
R8
2M
1%
HB
HB
HB
HBIN
V
R6
1.82M
1%
+
= (60mV)(0.263)
= 15.78mV
7
6
IN B
+
–
1
2
OUT B
–
+
V1
IN B
4. Choose the values for R3 and R4 to set the hysteresis.
R4 = 2.4M
R2
3.40M
1%
1/2LTC1444
5
IN A
+
–
R3(kΩ) = V = 15k
HB
OUT A
R7
1.21M
1%
–
5. Choose the values for R1 and R2 to set the trip point.
IN A
HYST
REF
4
R1 = V /I
= 1.221V/1µA ≈ 1.21M
REF BIAS
14
R1
1.21M
1%
R3
15k, 1%
8
V
IN
+
1.2V
R4
2.4M
1%
R5
R2 = R1
( )
− 1
–
430Ω
5%
VHB
2
–
V
9
VREF
+
C1
1.0µF
144345 F05
4.65V
R2 = 1.21M
− 1
(
)
15mV
Figure 5. Glitch-Free Level Detector with Hysteresis
1.221V +
2
R2 3.40M
Using the same equations, R6 and R7 are 1.82M and
1.21M, respectively, to set the trip level at 3V for V2.
144345fe
10
LTC1443/LTC1444/LTC1445
package DescripTion
N Package
16-Lead PDIP (Narrow .300 Inch)
(Reference LTC DWG # 05-03-1510 Rev Iꢂ
.770ꢀ
(19.553ꢂ
MAX
14
12
10
9
3
15
1ꢁ
11
16
.255 .015ꢀ
(6.477 0.ꢁ31ꢂ
2
1
ꢁ
4
6
5
7
.ꢁ00 – .ꢁ25
(7.620 – 3.255ꢂ
.1ꢁ0 .005
(ꢁ.ꢁ02 0.127ꢂ
.045 – .065
(1.14ꢁ – 1.651ꢂ
.020
(0.503ꢂ
MIN
.065
(1.651ꢂ
TYP
.003 – .015
(0.20ꢁ – 0.ꢁ31ꢂ
+.0ꢁ5
–.015
.ꢁ25
.120
(ꢁ.043ꢂ
MIN
.013 .00ꢁ
(0.457 0.076ꢂ
.100
(2.54ꢂ
BSC
+0.339
3.255
(
)
–0.ꢁ31
N16 REV I 0711
NOTE:
INCHES
MILLIMETERS
1. DIMENSIONS ARE
ꢀTHESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mmꢂ
S Package
16-Lead Plastic Small Outline (Narrow .150 Inch)
(Reference LTC DWG # 05-08-1610 Rev G)
.386 – .394
(9.804 – 10.008)
.045 .005
NOTE 3
.050 BSC
16
N
15
14
13
12
11
10
9
N
1
.245
MIN
.160 .005
.150 – .157
(3.810 – 3.988)
NOTE 3
.228 – .244
(5.791 – 6.197)
2
3
N/2
N/2
8
.030 .005
TYP
RECOMMENDED SOLDER PAD LAYOUT
3
5
6
7
1
2
4
.010 – .020
(0.254 – 0.508)
× 45°
.053 – .069
(1.346 – 1.752)
.004 – .010
(0.101 – 0.254)
.008 – .010
(0.203 – 0.254)
0° – 8° TYP
.050
(1.270)
BSC
.014 – .019
(0.355 – 0.483)
TYP
.016 – .050
(0.406 – 1.270)
S16 REV G 0212
NOTE:
1. DIMENSIONS IN
INCHES
(MILLIMETERS)
2. DRAWING NOT TO SCALE
3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm)
4. PIN 1 CAN BE BEVEL EDGE OR A DIMPLE
144345fe
11
LTC1443/LTC1444/LTC1445
package DescripTion
DHD Package
16-Lead Plastic DFN (5mm × 4mm)
(Reference LTC DWG # 05-08-ꢀ707 Rev Ø)
0.70 0.05
4.50 0.05
3.ꢀ0 0.05
2.44 0.05
(2 SIDES)
PACKAGE
OUTLINE
0.25 0.05
0.50 BSC
4.34 0.05
(2 SIDES)
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
R = 0.ꢀꢀ5
TYP
0.40 0.ꢀ0
5.00 0.ꢀ0
(2 SIDES)
9
ꢀ6
R = 0.20
TYP
4.00 0.ꢀ0
(2 SIDES)
2.44 0.ꢀ0
(2 SIDES)
PIN ꢀ
TOP MARK
(SEE NOTE 6)
PIN ꢀ
NOTCH
(DHDꢀ6) DFN 0504
8
ꢀ
0.25 0.05
0.50 BSC
0.75 0.05
0.200 REF
4.34 0.ꢀ0
(2 SIDES)
0.00 – 0.05
BOTTOM VIEW—EXPOSED PAD
NOTE:
ꢀ. DRAWING PROPOSED TO BE MADE VARIATION OF VERSION (WJGD-2) IN JEDEC
PACKAGE OUTLINE MO-229
2. DRAWING NOT TO SCALE
3. ALL DIMENSIONS ARE IN MILLIMETERS
4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE
MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.ꢀ5mm ON ANY SIDE
5. EXPOSED PAD SHALL BE SOLDER PLATED
6. SHADED AREA IS ONLY A REFERENCE FOR PIN ꢀ LOCATION ON THE
TOP AND BOTTOM OF PACKAGE
144345fe
12
LTC1443/LTC1444/LTC1445
revision hisTory (Revision history begins at Rev D)
REV
DATE
4/11
5/12
DESCRIPTION
PAGE NUMBER
D
Minor update to Figure 5 in the Applications Information section
Internal Voltage Reference Symbol Updated
DFN Package Description Corrected
DFN Storage Temperature Range Increased to 150°C
Order Information Corrected
10
E
1, 7, 8, 9, 10, 14
2
2
3
Related Parts Updated
14
144345fe
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
13
LTC1443/LTC1444/LTC1445
Typical applicaTion
Single Cell to 5V Supply
R1
1.1M
5%
L1
D1
10µH
3
+
A
1N5817
5
4
SUMIDA
CD54-100
+
V
2
1/4 LTC1444
R2
82.5k
1%
+
–
C2
R7
51k
5%
100µF
6
7
V
SW
SENSE
IN
–
6
7
4
1 CELL
LITHIUM-
ION
B
1
3
5
1
SHDN
1/4 LTC1444
R3
1M
1%
2, 4
3
BATTERY
+
HYST
LT1300
R8
732k
1%
R10
3.37M
5%
R11
51k
5%
Q1
14
I
NC
LIM
MMFT2955ETI
2
V
CC
NMI
µP
NC
SEL
+
11
R5
51k
5%
C3
+
R9
267k
1%
PWR GND
8
GND
1
100µF
R12
C
16 13
+
51k
5%
1/4 LTC1444
D
10
15
RESET
–
1/4 LTC1444
8
REF
R4
2.4M
5%
R6
430Ω
5%
12
–
LTC1444
REF
+
1.2V
–
C1
1µF
C4
0.22µF
–
V
9
144345 TA03
C2, C3: AUX TPSD107M010R0100 OR
SANYO OS-CON 16SA100M
relaTeD parTs
PART NUMBER
LTC1041
DESCRIPTION
Bang-Bang Controller with 1nA Off Current
COMMENTS
2.8V to 18V, Ideal for Temperature or Motor Control Circuit
Fault Detect, Go/No Go Test, Supply Monitor
LTC1042
Micropower, High Accuracy Window Comparator
Ultralow Power Comparator with Reference
LTC1440/LTC1540
LTC1441/LTC1442
LTC1541/LTC1542
LTC1842/LTC1843
LTC1921
1.128V 1ꢀ Reference, 10mV (Max) Input Offset
1.182V 1ꢀ Reference, 8µs Prop Delay, 5.7µA
1.2V 0.8 Reference, Amplifier Stable with 1000pF Load
1.182V 1ꢀ Reference, 4µs, 3.5µA, Open-Drain Out
–48V Telecom and Network Backplane Monitor
Adjustable Threshold and Hysteresis, 2.5mA Supply
Dual Ultralow Power Comparators with Reference
Combined Amplifier, Comparator and Reference
Dual Ultralow Power Comparators with Reference
Dual Independent Monitors for –48V Supply and Fuse
High Accuracy Comparator with 1.2V Reference
Dual Comparators with 400mV Reference
LTC1998
LT®6700
1.4V to 18V Operation, 18µs Prop Delay,
Available in SOT-23 and 2mm × 3mm DFN Packages
LT6703
Single Comparator with 400mV Reference
1.4V to 18V Operation, 6.5µA Supply Current,
Available in SOT-23 and 2mm × 2mm DFN Packages
144345fe
LT 0512 REV E • PRINTED IN USA
LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
14
●
●
LINEAR TECHNOLOGY CORPORATION 1995
(408) 432-1900 FAX: (408) 434-0507 www.linear.com
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