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 re-
verse supply up to 25V. The input range of the LT1637 in-
cludes 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. For space limited applications, the
LT1637 is available in a 3mm
×
3mm
×
0.8mm dual fine
pitch leadless package (DFN).
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
Over-The-Top is a registered trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Operates with Inputs Above V
+
Rail-to-Rail Input and Output
Micropower: 250µA Supply Current Max
Operating Temperature Range: – 55°C to 125°C
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
Available in 8-Lead MSOP, PDIP and SO Packages;
and a Tiny (3mm
×
3mm
×
0.8mm) DFN Package
APPLICATIO S
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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
®
Current Source with Shutdown
Switchable Precision Current Source
4V TO 44V
V
SHDN
6V
4V
2V
0V
R
+
LT1637
TP0610
I
OUT
= 1.2
R
e.g., 10mA = 120Ω
1637 TA01
10mA
I
OUT
5mA
–
I
OUT
SHDN
0mA
100µs/DIV
1637 TA01b
*OPTIONAL FOR LOW OUTPUT CURRENTS,
R* = R
U
U
U
Current Source Timing
1637fd
1
LT1637
ABSOLUTE
AXI U RATI GS
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
Operating Temperature Range (Note 3)
LT1637C/LT1637I .............................. – 40°C to 85°C
LT1637H .......................................... – 40°C to 125°C
LT1637MP ......................................... –55°C to 125°C
PACKAGE/ORDER I FOR ATIO
TOP VIEW
NULL 1
–IN A 2
+IN A 3
V
–
8
7
6
5
NULL
V
+
OUT
SHDN
4
NULL
–IN
+IN
V
–
1
2
3
4
DD PACKAGE
8-LEAD (3mm
×
3mm) PLASTIC DFN
T
JMAX
= 125°C,
θ
JA
= 160°C/W (NOTE 2)
MS8 PACKAGE
8-LEAD PLASTIC MSOP
T
JMAX
= 150°C,
θ
JA
= 250°C/W
UNDERSIDE METAL CONNECTED TO V
–
ORDER PART
NUMBER
LT1637CDD
LT1637IDD
DD PART*
MARKING
LAAK
LAAK
ORDER PART
NUMBER
LT1637CMS8
LT1637IMS8
*The temperature grades are identified by a label on the shipping container. Consult factory for parts specified with wider operating temperature ranges.
3V A D 5V ELECTRICAL CHARACTERISTICS
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
DD Package
0°C
≤
T
A
≤
70°C
– 40°C
≤
T
A
≤
85°C
The
●
denotes the specifications which apply over the full operating temperature range of –40°C
≤
T
A
≤
85°C, 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)
LT1637C/LT1637I
MIN
TYP
MAX
100
●
●
2
U
U
W
W W
U
W
(Note 1)
Specified Temperature Range (Note 4)
LT1637C/LT1637I .............................. – 40°C to 85°C
LT1637H .......................................... – 40°C to 125°C
LT1637MP ......................................... –55°C to 125°C
Junction Temperature ........................................... 150°C
Junction Temperature (DD Package) ................... 125°C
Storage Temperature Range ................. – 65°C to 150°C
Storage Temperature Range
(DD Package) ....................................... – 65°C to 125°C
Lead Temperature (Soldering, 10 sec).................. 300°C
TOP VIEW
TOP VIEW
8
7
6
5
NULL
V
+
OUT
SHDN
NULL 1
–IN 2
+IN 3
V
–
4
8
7
6
5
NULL
V
+
OUT
SHDN
N8 PACKAGE
S8 PACKAGE
8-LEAD PDIP
8-LEAD PLASTIC SO
T
JMAX
= 150°C,
θ
JA
= 150°C/W (N8)
T
JMAX
= 150°C,
θ
JA
= 190°C/W (S8)
MS8 PART*
MARKING
LTIE
LTIE
ORDER PART
NUMBER
LT1637CN8
LT1637CS8
LT1637IN8
LT1637IS8
LT1637HS8
LT1637MPS8
S8 PART
MARKING
1637
1637I
1637H
1637MP
U
UNITS
µV
µV
µV
µV
µV
µV
µV
µV
µV
1637fd
350
550
700
350
750
1100
550
950
1100
100
●
●
125
●
●
LT1637
3V A D 5V ELECTRICAL CHARACTERISTICS
SYMBOL
PARAMETER
Input Offset Voltage Drift (Note 9)
The
●
denotes the specifications which apply over the full operating temperature range of –40°C
≤
T
A
≤
85°C, 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)
CONDITIONS
N8, S8 Packages, – 40°C
≤
T
A
≤
85°C
MS8 Package, – 40°C
≤
T
A
≤
85°C
DDPackage, – 40°C
≤
T
A
≤
85°C
V
CM
= 44V (Note 5)
I
B
Input Bias Current
V
CM
= 44V (Note 5)
V
S
= 0V
Input Noise Voltage
e
n
i
n
R
IN
C
IN
CMRR
A
VOL
Input Noise Voltage Density
Input Noise Current Density
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)
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
V
OL
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
I
SC
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
PSRR
Power Supply Rejection Ratio
Minimum Supply Voltage
Reverse Supply Voltage
I
S
Supply Current
(Note 6)
Supply Current, SHDN
I
SHDN
Shutdown Pin Current
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)
I
S
= – 100µA
V
S
= 3V to 12.5V, V
CM
= V
O
= 1V
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
I
OS
V
OH
U
●
●
●
●
●
●
●
LT1637C/LT1637I
MIN
TYP
MAX
1
3
2
6
2
6
0.4
20
23
0.1
0.6
27
0.08
1
0.7
0
88
80
150
100
75
300
200
150
110
98
400
2.6
1.4
4
44
6.0
2.5
50
60
UNITS
µV/°C
µV/°C
µV/°C
nA
µA
nA
µA
nA
µV
P-P
nV/√Hz
pA/√Hz
MΩ
MΩ
pF
V
dB
dB
V/mV
V/mV
V/mV
V/mV
V/mV
V/mV
Input Offset Current
0.1Hz to 10Hz
f = 1kHz
f = 1kHz
Differential
Common Mode, V
CM
= 0V to 44V
800
3
325
580
2.94
2.25
4.94
3.80
10
15
15
15
90
25
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
2.7
40
190
3
0.2
1.0
2.5
4.3
0.02
250
295
12
15
5
V
V
µA
µA
µA
nA
µA
µA
µA
µA
1637fd
Output Leakage Current, SHDN
●
1
3
LT1637
The
●
denotes the specifications which apply over the full operating temperature range of –40°C
≤
T
A
≤
85°C, 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
t
ON
t
OFF
t
SETTLING
GBW
PARAMETER
Maximum Shutdown Pin Current
Turn-On Time
Turn-Off Time
Settling Time
Gain-Bandwidth Product
(Note 5)
Slew Rate
(Note 7)
CONDITIONS
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
●
●
●
●
●
3V A D 5V ELECTRICAL CHARACTERISTICS
SR
The
●
denotes the specifications which apply over the full operating temperature range of –40°C
≤
T
A
≤
85°C, 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
DD Package
0°C
≤
T
A
≤
70°C
– 40°C
≤
T
A
≤
85°C
Input Offset Voltage Drift (Note 9)
N8, S8 Packages, – 40°C
≤
T
A
≤
85°C
MS8 Package, – 40°C
≤
T
A
≤
85°C
DD Package, – 40°C
≤
T
A
≤
85°C
●
●
±15V
ELECTRICAL CHARACTERISTICS
I
OS
I
B
e
n
i
n
R
IN
C
IN
CMRR
A
VOL
V
OL
4
U
LT1637C/LT1637I
MIN
TYP
MAX
20
45
3
9
650
550
500
0.210
0.185
0.170
1000
150
UNITS
µA
µs
µs
µs
kHz
kHz
kHz
V/µs
V/µs
V/µs
0.35
LT1637C/LT1637I
MIN
TYP
MAX
100
450
650
800
450
800
1150
650
1000
1150
3
6
6
6
50
UNITS
µV
µV
µV
µV
µV
µV
µV
µV
µV
µV/°C
µV/°C
µV/°C
nA
nA
µV
P-P
nV/√Hz
pA/√Hz
MΩ
MΩ
pF
100
●
●
125
●
●
●
●
●
●
●
1
2
2
1
17
0.6
27
0.08
1
3
2200
4
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
0.1Hz to 10Hz
f = 1kHz
f = 1kHz
Differential
Common Mode, V
CM
= – 15V to 14V
●
●
●
●
●
●
●
– 15
80
100
75
50
110
400
29
V
dB
V/mV
V/mV
V/mV
Output Voltage Swing LOW
– 14.997
– 14.680
– 14.420
– 14.95
– 14.25
– 13.65
V
V
V
1637fd
LT1637
The
●
denotes the specifications which apply over the full operating temperature range of –40°C
≤
T
A
≤
85°C, 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
OH
PARAMETER
Output Voltage Swing HIGH
CONDITIONS
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
●
●
●
●
●
●
●
±15V
ELECTRICAL CHARACTERISTICS
LT1637C/LT1637I
MIN
TYP
MAX
14.9
14.2
13.7
±25
±20
±15
90
14.967
14.667
14.440
±31.7
UNITS
V
V
V
mA
mA
mA
dB
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
kHz
kHz
kHz
V/µs
V/µs
V/µs
●
Positive Supply Current, SHDN
I
SHDN
Shutdown Pin Current
Maximum Shutdown Pin Current
Output Leakage Current, SHDN
V
L
V
H
t
ON
t
OFF
GBW
Shutdown Pin Input Low Voltage
Shutdown Pin Input High Voltage
Turn-On Time
Turn-Off Time
Gain-Bandwidth Product
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
f = 10kHz
0°C
≤
T
A
≤
70°C
– 40°C
≤
T
A
≤
85°C
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
●
●
●
●
●
●
●
6
0.3
0.9
20
0.02
– 21.7
– 21.6
– 20.8
35
3
750
650
600
0.225
0.200
0.180
1100
●
●
●
●
SR
Slew Rate
0.4
1637fd
5
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