LT1637
1.1MHz, 0.4V/s
Over-The-Top Micropower, Rail-To-Rail
Input and Output Op Amp
FEATURES DESCRIPTIO
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Operates with Inputs Above V The LT 1637 is a rugged op amp that operates on all single
Rail-to-Rail Input and Output and split supplies with a total voltage of 2.7V to 44V. The
Micropower: 250A Supply Current Max LT1637 has a gain-bandwidth product of 1.1MHz while
Operating Temperature Range: 55C to 125C drawing less than 250A of quiescent current. The LT1637
Gain-Bandwidth Product: 1.1MHz can be shut down, making the output high impedance and
Slew Rate: 0.4V/s reducing the quiescent current to only 3A. The LT1637 is
Low Input Offset Voltage: 350V Max reverse supply protected: it draws virtually no current for re-
Single Supply Input Range: 0.4V to 44V verse supply up to 25V. The input range of the LT1637 in-
High Output Current: 25mA Min cludes both supplies and the output swings to both supplies.
Specified on 3V, 5V and 15V Supplies Unlike most micropower op amps, the LT1637 can drive
Output Shutdown heavy loads; its rail-to-rail output drives 25mA. The LT1637
Output Drives 4700pF with Output Compensation is unity-gain stable into all capacitive loads up to 4700pF
Reverse Battery Protection to 25V when optional 0.22F and 150 compensation is used.
High Voltage Gain: 800V/mV
The LT1637 has a unique input stage that operates and
High CMRR: 110dB
remains high impedance when above the positive supply.
Available in 8-Lead MSOP, PDIP and SO Packages;
The inputs take 44V both differential and common mode,
and a Tiny (3mm 3mm 0.8mm) DFN Package
even when operating on a 3V supply. Built-in resistors
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protect the inputs for faults below the negative supply up
APPLICATIO S
to 22V. There is no phase reversal of the output for inputs
Battery or Solar Powered Systems: 5V below V or 44V above V , independent of V .
EE EE CC
Portable Instrumentation
The LT1637 op amp is available in the 8-pin MSOP, PDIP
Sensor Conditioning
and SO packages. For space limited applications, the
Supply Current Sensing
LT1637 is available in a 3mm 3mm 0.8mm dual fine
Battery Monitoring
pitch leadless package (DFN).
MUX Amplifiers
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
4mA to 25mA Transmitters
Over-The-Top is a registered trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATIO
Over-The-Top Current Source with Shutdown
Current Source Timing
Switchable Precision Current Source
6V
4V TO 44V
4V
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V
SHDN
4.7F LT1004-1.2
2V
2k R
0V
R*
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LT1637 TP0610
10mA
1.2
I = I 5mA
OUT OUT
R
I e.g., 10mA = 120
OUT
0mA
SHDN *OPTIONAL FOR LOW OUTPUT CURRENTS, 1637 TA01
1637 TA01b
R* = R
100s/DIV
1637fd
1
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ULT1637
ABSOLUTE AXI U RATI GS
(Note 1)
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Total Supply Voltage (V to V ) .............................. 44V Specified Temperature Range (Note 4)
Input Differential Voltage ......................................... 44V LT1637C/LT1637I .............................. 40C to 85C
Input Current ...................................................... 25mA LT1637H .......................................... 40C to 125C
Shutdown Pin Voltage Above V ..................................... 32V LT1637MP......................................... 55C to 125C
Shutdown Pin Current ........................................ 10mA Junction Temperature........................................... 150C
Output Short-Circuit Duration (Note 2) .........Continuous Junction Temperature (DD Package) ................... 125C
Operating Temperature Range (Note 3) Storage Temperature Range ................. 65C to 150C
LT1637C/LT1637I .............................. 40C to 85C Storage Temperature Range
LT1637H .......................................... 40C to 125C (DD Package) ....................................... 65C to 125C
LT1637MP......................................... 55C to 125C Lead Temperature (Soldering, 10 sec).................. 300C
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PACKAGE/ORDER I FOR ATIO
TOP VIEW
TOP VIEW
TOP VIEW
NULL 1 8 NULL
NULL 1 8 NULL
NULL 1 8 NULL
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IN A 2 7 V
IN 2 7 V
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IN 2 7 V
+IN A 3 6 OUT
+IN 3 6 OUT
+IN 3 6 OUT
V 4 5 SHDN
V SHDN
4 5
V SHDN
4 5
MS8 PACKAGE
8-LEAD PLASTIC MSOP
N8 PACKAGE S8 PACKAGE
DD PACKAGE
T = 150C, = 250C/W
8-LEAD PDIP 8-LEAD PLASTIC SO
JMAX JA
8-LEAD (3mm 3mm) PLASTIC DFN
T = 150C, = 150C/W (N8)
JMAX JA
T = 125C, = 160C/W (NOTE 2)
JMAX JA
T = 150C, = 190C/W (S8)
JMAX JA
UNDERSIDE METAL CONNECTED TO V
ORDER PART ORDER PART MS8 PART* ORDER PART S8 PART
DD PART*
NUMBER NUMBER MARKING NUMBER MARKING
MARKING
LT1637CDD LAAK LT1637CMS8 LTIE LT1637CN8 1637
LT1637IDD LAAK LT1637IMS8 LTIE LT1637CS8 1637I
LT1637IN8 1637H
LT1637IS8 1637MP
LT1637HS8
LT1637MPS8
*The temperature grades are identified by a label on the shipping container. Consult factory for parts specified with wider operating temperature ranges.
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3V A D 5V ELECTRICAL CHARACTERISTICS
The denotes the specifications which apply over the full operating temperature range of 40C T 85C, otherwise
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specifications are at T = 25C. V = 3V, 0V; V = 5V, 0V; V = V ,V = V = half supply unless otherwise specified. (Note 4)
A S S SHDN CM OUT
LT1637C/LT1637I
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V Input Offset Voltage N8, S8 Packages 100 350 V
OS
0C T 70C 550 V
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40C T 85C 700 V
A
MS8 Package 100 350 V
0C T 70C 750 V
A
40C T 85C 1100 V
A
DD Package 125 550 V
0C T 70C 950 V
A
40C T 85C 1100 V
A
1637fd
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