FEATURES
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LT1637
1.1MHz, 0.4V/µs
Over-The-Top Micropower, Rail-To-Rail
Input and Output Op Amp
DESCRIPTIO
The LT
®
1637 is a rugged op amp that operates on all single
and split supplies with a total voltage of 2.7V to 44V. The
LT1637 has a gain-bandwidth product of 1.1MHz while
drawing less than 250µA of quiescent current. The LT1637
can be shut down, making the output high impedance and
reducing the quiescent current to only 3µA. The LT1637 is
reverse supply protected: it draws virtually no current for
reverse supply up to 25V. The input range of the LT1637
includes both supplies and the output swings to both
supplies. Unlike most micropower op amps, the LT1637
can drive heavy loads; its rail-to-rail output drives 25mA.
The LT1637 is unity-gain stable into all capacitive loads up
to 4700pF when optional 0.22µF and 150Ω compensation
is used.
The LT1637 has a unique input stage that operates and
remains high impedance when above the positive supply.
The inputs take 44V both differential and common mode,
even when operating on a 3V supply. Built-in resistors
protect the inputs for faults below the negative supply up
to 22V. There is no phase reversal of the output for inputs
5V below V
EE
or 44V above V
EE
, independent of V
CC
.
The LT1637 op amp is available in the 8-pin MSOP, PDIP
and SO packages.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Over-The-Top is a trademark of Linear Technology Corporation.
Operates with Inputs Above V
+
Rail-to-Rail Input and Output
Micropower: 250µA Supply Current Max
Gain-Bandwidth Product: 1.1MHz
Slew Rate: 0.4V/µs
Low Input Offset Voltage: 350µV Max
Single Supply Input Range: – 0.4V to 44V
High Output Current: 25mA Min
Specified on 3V, 5V and
±15V
Supplies
Output Shutdown
Output Drives 4700pF with Output Compensation
Reverse Battery Protection to 25V
High Voltage Gain: 800V/mV
High CMRR: 110dB
APPLICATIO S
s
s
s
s
s
Battery or Solar Powered Systems:
Portable Instrumentation
Sensor Conditioning
Supply Current Sensing
Battery Monitoring
MUX Amplifiers
4mA to 25mA Transmitters
TYPICAL APPLICATIO
+
4.7µF
R*
LT1004-1.2
2k
Over-The-Top
TM
Current Source with Shutdown
Switchable Precision Current Source
4V TO 44V
6V
4V
V
SHDN
2V
R
+
LT1637
TP0610
I
OUT
= 1.2
R
e.g., 10mA = 120Ω
1637 TA01
0V
–
I
OUT
SHDN
10mA
I
OUT
5mA
0mA
*OPTIONAL FOR LOW OUTPUT CURRENTS,
R* = R
U
U
U
Current Source Timing
100µs/DIV
1637 TA01b
1
LT1637
ABSOLUTE
(Note 1)
AXI U RATI GS
Operating Temperature Range (Note 3) .. – 40°C to 85°C
Specified Temperature Range (Note 4) ... – 40°C to 85°C
Junction Temperature ........................................... 150°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
Total Supply Voltage (V
+
to V
–
) .............................. 44V
Input Differential Voltage ......................................... 44V
Input Current ......................................................
±25mA
Shutdown Pin Voltage Above V
– .....................................
32V
Shutdown Pin Current ........................................
±10mA
Output Short-Circuit Duration (Note 2) ......... Continuous
PACKAGE/ORDER I FOR ATIO
TOP VIEW
NULL
–
IN
+
IN
V
–
1
2
3
4
8
7
6
5
NULL
V
+
OUT
SHDN
ORDER PART
NUMBER
LT1637CMS8
MS8 PACKAGE
8-LEAD PLASTIC MSOP
T
JMAX
= 150°C,
θ
JA
= 250°C/W
MS8 PART
MARKING
LTIE
Consult factory for Military grade parts.
3V A D 5V ELECTRICAL CHARACTERISTICS
The
q
denotes the specifications which apply over the specified temperature range, otherwise specifications are at T
A
= 25°C.
V
S
= 3V, 0V; V
S
= 5V, 0V; V
SHDN
= V
–
,V
CM
= V
OUT
= Half Supply unless otherwise specified. (Note 4)
SYMBOL
V
OS
PARAMETER
Input Offset Voltage
CONDITIONS
N8, S8 Packages
0°C
≤
T
A
≤
70°C
– 40°C
≤
T
A
≤
85°C
MS8 Package
0°C
≤
T
A
≤
70°C
– 40°C
≤
T
A
≤
85°C
Input Offset Voltage Drift (Note 9)
I
OS
I
B
Input Offset Current
V
CM
= 44V (Note 5)
Input Bias Current
V
CM
= 44V (Note 5)
V
S
= 0V
Input Noise Voltage
e
n
i
n
Input Noise Voltage Density
Input Noise Current Density
0.1Hz to 10Hz
f = 1kHz
f = 1kHz
N8, S8 Packages, – 40°C
≤
T
A
≤
85°C
MS8 Package, – 40°C
≤
T
A
≤
85°C
q
q
2
U
U
W
W W
U
W
TOP VIEW
NULL 1
–
IN
+
IN
8
7
6
5
NULL
V
+
OUT
SHDN
ORDER PART
NUMBER
LT1637CN8
LT1637CS8
LT1637IN8
LT1637IS8
S8 PART
MARKING
1637
1637I
2
3
V
–
4
N8 PACKAGE
8-LEAD PDIP
S8 PACKAGE
8-LEAD PLASTIC SO
T
JMAX
= 150°C,
θ
JA
= 130°C/W (N8)
T
JMAX
= 150°C,
θ
JA
= 190°C/W (S8)
U
MIN
TYP
100
MAX
350
550
700
350
750
900
3
6
6.0
2.5
50
60
UNITS
µV
µV
µV
µV
µV
µV
µV/°C
µV/°C
nA
µA
nA
µA
nA
µV
P-P
nV/√Hz
pA/√Hz
100
q
q
q
q
q
q
q
q
1
2
0.4
20
23
0.1
0.6
27
0.08
LT1637
3V A D 5V ELECTRICAL CHARACTERISTICS
SYMBOL
R
IN
C
IN
CMRR
A
VOL
PARAMETER
Input Resistance
Input Capacitance
Input Voltage Range
Common Mode Rejection Ratio
(Note 5)
Large-Signal Voltage Gain
V
CM
= 0V to (V
CC
– 1V)
V
CM
= 0V to 44V (Note 8)
CONDITIONS
Differential
Common Mode, V
CM
= 0V to 44V
The
q
denotes the specifications which apply over the specified temperature range, otherwise specifications are at T
A
= 25°C.
V
S
= 3V, 0V; V
S
= 5V, 0V; V
SHDN
= V
–
, V
CM
= V
OUT
= Half Supply unless otherwise specified. (Note 4)
MIN
1
0.7
q
q
q
q
q
q
q
q
q
q
q
q
q
q
V
OL
V
OH
I
SC
PSRR
I
S
I
SHDN
t
ON
t
OFF
t
SETTLING
GBW
SR
U
TYP
2.6
1.4
4
MAX
UNITS
MΩ
MΩ
pF
0
88
80
150
100
75
300
200
150
110
98
400
44
V
dB
dB
V/mV
V/mV
V/mV
V/mV
V/mV
V/mV
V
S
= 3V, V
O
= 500mV to 2.5V, R
L
= 10k
V
S
= 3V, 0°C
≤
T
A
≤
70°C
V
S
= 3V, – 40°C
≤
T
A
≤
85°C
V
S
= 5V, V
O
= 500mV to 4.5V, R
L
= 10k
V
S
= 5V, 0°C
≤
T
A
≤
70°C
V
S
= 5V, – 40°C
≤
T
A
≤
85°C
800
Output Voltage Swing LOW
No Load
I
SINK
= 5mA
V
S
= 5V, I
SINK
= 10mA
V
S
= 3V, No Load
V
S
= 3V, I
SOURCE
= 5mA
V
S
= 5V, No Load
V
S
= 5V, I
SOURCE
= 10mA
3
325
580
2.94
2.25
4.94
3.80
10
15
15
15
2.975
2.67
4.975
4.45
14
45
22
60
98
8
700
1300
mV
mV
mV
V
V
V
V
mA
mA
mA
mA
dB
Output Voltage Swing HIGH
Short-Circuit Current (Note 2)
V
S
= 3V, Short Output to Ground
V
S
= 3V, Short Output to V
CC
V
S
= 5V, Short Output to Ground
V
S
= 5V, Short Output to V
CC
Power Supply Rejection Ratio
Minimum Supply Voltage
Reverse Supply Voltage
Supply Current
(Note 6)
Supply Current, SHDN
Shutdown Pin Current
V
S
= 3V to 12.5V, V
CM
= V
O
= 1V
I
S
= – 100µA
q
q
q
q
90
25
2.7
40
190
250
295
12
15
5
V
V
µA
µA
µA
nA
µA
µA
µA
µA
µA
µs
µs
µs
kHz
kHz
kHz
V/µs
V/µs
V/µs
V
PIN5
= 2V, No Load (Note 6)
V
PIN5
= 0.3V, No Load (Note 6)
V
PIN5
= 2V, No Load (Note 5)
V
PIN5
= 3.3V
V
PIN5
= 5V
V
PIN5
= 2V, No Load (Note 6)
V
PIN5
= 32V, No Load (Note 5)
V
PIN5
= 5V to 0V, R
L
= 10k
V
PIN5
= 0V to 5V, R
L
= 10k
0.1% A
V
= 1,
∆V
O
= 2V
f = 10kHz
0°C
≤
T
A
≤
70°C
– 40°C
≤
T
A
≤
85°C
A
V
= – 1, R
L
=
∞
0°C
≤
T
A
≤
70°C
– 40°C
≤
T
A
≤
85°C
q
q
q
3
0.2
1.0
2.5
4.3
0.02
20
45
3
9
650
550
500
0.210
0.185
0.170
1000
Output Leakage Current
Maximum Shutdown Pin Current
Turn-On Time
Turn-Off Time
Settling Time
Gain-Bandwidth Product
(Note 5)
Slew Rate
(Note 7)
q
q
1
150
q
q
q
q
0.35
3
LT1637
The
q
denotes the specifications which apply over the specified temperature range, otherwise specifications are at T
A
= 25°C.
V
S
=
±15V,
V
CM
= 0V, V
OUT
= 0V, V
SHDN
= V
–
unless otherwise specified. (Note 4)
SYMBOL
V
OS
PARAMETER
Input Offset Voltage
CONDITIONS
N8, S8 Packages
0°C
≤
T
A
≤
70°C
– 40°C
≤
T
A
≤
85°C
MS8 Package
0°C
≤
T
A
≤
70°C
– 40°C
≤
T
A
≤
85°C
Input Offset Voltage Drift (Note 9)
I
OS
I
B
e
n
i
n
R
IN
C
IN
CMRR
A
VOL
Input Offset Current
Input Bias Current
Input Noise Voltage
Input Noise Voltage Density
Input Noise Current Density
Input Resistance
Input Capacitance
Input Voltage Range
Common Mode Rejection Ratio
Large-Signal Voltage Gain
V
CM
= – 15V to 29V
V
O
=
±14V,
R
L
= 10k
0°C
≤
T
A
≤
70°C
– 40°C
≤
T
A
≤
85°C
No Load
I
SINK
= 5mA
I
SINK
= 10mA
No Load
I
SOURCE
= 5mA
I
SOURCE
= 10mA
Short Output to GND
0°C
≤
T
A
≤
70°C
– 40°C
≤
T
A
≤
85°C
V
S
=
±1.5V
to
±22V
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
±15V
ELECTRICAL CHARACTERISTICS
MIN
TYP
100
MAX
450
650
800
450
800
950
3
6
6
50
UNITS
µV
µV
µV
µV
µV
µV
µV/°C
µV/°C
nA
nA
µV
P-P
nV/√Hz
pA/√Hz
MΩ
MΩ
pF
100
q
q
q
q
q
q
N8, S8 Packages, – 40°C
≤
T
A
≤
85°C
MS8 Package, – 40°C
≤
T
A
≤
85°C
1
2
1
17
0.6
27
0.08
1
3
2200
4
– 15
80
100
75
50
110
400
0.1Hz to 10Hz
f = 1kHz
f = 1kHz
Differential
Common Mode, V
CM
= – 15V to 14V
29
V
dB
V/mV
V/mV
V/mV
V
OL
Output Voltage Swing LOW
– 14.997
– 14.680
– 14.420
14.9
14.2
13.7
±25
±20
±15
90
14.967
14.667
14.440
±31.7
– 14.95
– 14.25
– 13.65
V
V
V
V
V
V
mA
mA
mA
dB
V
OH
Output Voltage Swing HIGH
I
SC
Short-Circuit Current (Note 2)
PSRR
I
S
Power Supply Rejection Ratio
Minimum Supply Voltage
Supply Current
115
±1.35
230
300
370
40
15
8
150
2
–20.0
V
µA
µA
µA
nA
µA
µA
µA
V
V
µs
µs
q
Positive Supply Current, SHDN
I
SHDN
Shutdown Pin Current
Maximum Shutdown Pin Current
Output Leakage Current
V
L
V
H
t
ON
t
OFF
Shutdown Pin Input Low Voltage
Shutdown Pin Input High Voltage
Turn-On Time
Turn-Off Time
V
PIN5
= – 20V, V
S
=
±22V,
No Load
V
PIN5
= – 21.7V, V
S
=
±22V,
No Load
V
PIN5
= – 20V, V
S
=
±22V,
No Load
V
PIN5
= 32V, V
S
=
±22V
V
PIN5
= – 20V, V
S
=
±22V,
No Load
V
S
=
±22V
V
S
=
±22V
V
PIN5
= – 10V to – 15V, R
L
= 10k
V
PIN5
= – 15V to – 10V, R
L
= 10k
q
q
q
q
q
q
q
6
0.3
0.9
20
0.02
– 21.7
– 21.6
– 20.8
35
3
4
LT1637
±15V
ELECTRICAL CHARACTERISTICS
SYMBOL
GBW
PARAMETER
Gain-Bandwidth Product
CONDITIONS
f = 10kHz
0°C
≤
T
A
≤
70°C
– 40°C
≤
T
A
≤
85°C
The
q
denotes the specifications which apply over the specified temperature range, otherwise specifications are at T
A
= 25°C.
V
S
=
±15V,
V
CM
= 0V, V
OUT
= 0V, V
SHDN
= V
–
unless otherwise specified. (Note 4)
MIN
q
q
q
q
TYP
1100
MAX
UNITS
kHz
kHz
kHz
V/µs
V/µs
V/µs
750
650
600
0.225
0.200
0.180
SR
Slew Rate
A
V
= – 1, R
L
=
∞,
V
O
=
±10V,
Measure at V
O
=
±5V
0°C
≤
T
A
≤
70°C
– 40°C
≤
T
A
≤
85°C
0.4
Note 1:
Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2:
A heat sink may be required to keep the junction temperature
below absolute maximum.
Note 3:
The LT1637 is guaranteed functional over the operating
temperature range of – 40°C to 85°C.
Note 4:
The LT1637C is guaranteed to meet specified performance from
0°C to 70°C. The LT1637C is designed, characterized and expected to
meet specified performance from – 40°C to 85°C but is not tested or QA
sampled at these temperatures. The LT1637I is guaranteed to meet
specified performance from – 40°C to 85°C.
Note 5:
V
S
= 5V limits are guaranteed by correlation to V
S
= 3V and
V
S
=
±15V
or V
S
=
±22V
tests.
Note 6:
V
S
= 3V limits are guaranteed by correlation to V
S
= 5V and
V
S
=
±15V
or V
S
=
±22V
tests.
Note 7:
Guaranteed by correlation to slew rate at V
S
=
±15V
and GBW at
V
S
= 3V and V
S
=
±15V
tests.
Note 8:
This specification implies a typical input offset voltage of 650µV at
V
CM
= 44V and a maximum input offset voltage of 5.4mV at V
CM
= 44V.
Note 9:
This parameter is not 100% tested.
TYPICAL PERFOR A CE CHARACTERISTICS
Supply Current vs Supply Voltage
400
CHANGE IN INPUT OFFSET VOLTAGE (µV)
350
SUPPLY CURRENT (µA)
300
250
200
150
100
50
0
0
10
20
30
40
TOTAL SUPPLY VOLTAGE (V)
1637 G01
200
100
0
–100
–200
–300
–400
0
1
2
3
4
TOTAL SUPPLY VOLTAGE (V)
5
1637 G02
INPUT BIAS CURRENT (µA)
T
A
= 125°C
T
A
= 25°C
T
A
= –55°C
U W
Minimum Supply Voltage
400
300
40
30
20
10
0.12
0.08
0.04
0
0.04
0.08
Input Bias Current
vs Common Mode Voltage
V
S
= 5V, 0V
T
A
= –55°C
T
A
= 125°C
T
A
= –55°C
T
A
= 25°C
T
A
= 125°C
T
A
= 25°C
4
4.2 4.4 4.6 4.8 5 10 20 30 40 50
COMMON MODE VOLTAGE (V)
1637 G03
5
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