LT1636
Over-The-Top
Micropower Rail-to-Rail
Input and Output Op Amp
FEATURES
s
s
s
s
DESCRIPTIO
s
s
s
s
s
s
s
s
s
Rail-to-Rail Input and Output
Micropower: 50
µ
A I
Q
, 44V Supply
MSOP Package
Over-The-Top
TM
: Input Common Mode Range
Extends 44V Above V
EE
, Independent of V
CC
Low Input Offset Voltage: 225µV Max
Specified on 3V, 5V and
±15V
Supplies
High Output Current: 18mA
Output Shutdown
Output Drives 10,000pF with Output Compensation
Reverse Battery Protection to 27V
High Voltage Gain: 2000V/mV
High CMRR: 110dB
220kHz Gain-Bandwidth Product
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 20mA Transmitters
The LT
®
1636 op amp operates on all single and split supplies
with a total voltage of 2.7V to 44V drawing less than 50µA of
quiescent current. The LT1636 can be shut down, making the
output high impedance and reducing the quiescent current to
4µA. The LT1636 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. The output swings to both
supplies. Unlike most micropower op amps, the LT1636 can
drive heavy loads; its rail-to-rail output drives 18mA. The
LT1636 is unity-gain stable into all capacitive loads up to
10,000pF when a 0.22µF and 150Ω compensation network
is used.
The LT1636 is reverse supply protected: it draws no current
for reverse supply up to 27V. 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 LT1636 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.
TYPICAL APPLICATIO
Input Bias Current vs Common Mode Voltage
Over-The-Top Current Source with Shutdown
INPUT BIAS CURRENT (nA)
5000
3000
V
S
= 5V, 0V
4V TO
44V
R*
LT1004-1.2
1M
R
1000
40
30
20
10
0
–10
4.0
4.4
4.8
5.2 10 20 30 40 50
COMMON MODE VOLTAGE (V)
1636 G03
+
LT1636
J176
I
OUT
= 1.2
R
e.g., 10mA = 120Ω
1636 TA01
T
A
= – 55°C
T
A
= 125°C
T
A
= 25°C
–
I
OUT
SHDN
*OPTIONAL FOR LOW OUTPUT CURRENTS
U
U
U
1
LT1636
ABSOLUTE
MAXIMUM
RATINGS
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 INFORMATION
ORDER PART
NUMBER
TOP VIEW
NULL
–IN
+IN
V
–
1
2
3
4
8
7
6
5
NULL
V
+
OUT
SHDN
TOP VIEW
NULL 1
–IN 2
+IN 3
V
–
4
8
7
6
5
NULL
V
+
OUT
SHDN
LT1636CMS8
MS8 PART MARKING
LTCL
MS8 PACKAGE
8-LEAD PLASTIC MSOP
T
JMAX
= 150°C,
θ
JA
= 250°C/ W
Consult factory for Military grade parts.
3V, 5V
ELECTRICAL CHARACTERISTICS
V
S
= 3V, 0V; V
S
= 5V, 0V; V
CM
= V
OUT
= half supply, Pin 5 = open or V
EE
, Pins 1 and 8 open, T
A
= 25°C unless otherwise noted. (Note 3)
SYMBOL
V
OS
PARAMETER
Input Offset Voltage
CONDITIONS
N8 Package
0°C
≤
T
A
≤
70°C
– 40°C
≤
T
A
≤
85°C
S8 Package
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 8)
N8 Package, – 40°C
≤
T
A
≤
85°C
S8 Package, – 40°C
≤
T
A
≤
85°C
MS8 Package, – 40°C
≤
T
A
≤
85°C
V
CM
= 44V (Note 4)
I
B
Input Bias Current
V
CM
= 44V (Note 4)
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
q
q
I
OS
Input Offset Current
2
U
U
W
W W
U
W
(Note 1)
Operating Temperature Range ................ – 40°C to 85°C
Specified Temperature Range (Note 3) .. – 40°C to 85°C
Junction Temperature ........................................... 150°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
ORDER PART
NUMBER
LT1636CN8
LT1636CS8
LT1636IN8
LT1636IS8
S8 PART MARKING
1636
1636I
N8 PACKAGE
8-LEAD PLASTIC DIP
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)
MIN
TYP
50
MAX
225
400
550
225
600
750
225
700
850
5
8
10
0.8
0.6
8
6
UNITS
µV
µV
µV
µV
µV
µV
µV
µV
µV
µV/°C
µV/°C
µV/°C
nA
µA
nA
µA
nA
µV
P-P
nV/√Hz
pA/√Hz
50
q
q
50
q
q
q
q
q
q
q
q
q
1
2
2
0.1
5
3
0.1
0.7
52
0.035
LT1636
3V, 5V
ELECTRICAL CHARACTERISTICS
V
S
= 3V, 0V; V
S
= 5V, 0V; V
CM
= V
OUT
= half supply, Pin 5 = open or V
EE
, Pins 1 and 8 open, T
A
= 25°C unless otherwise noted. (Note 3)
SYMBOL
R
IN
C
IN
CMRR
A
VOL
PARAMETER
Input Resistance
Input Capacitance
Input Voltage Range
Common Mode Rejection Ratio
(Note 4)
Large-Signal Voltage Gain
V
CM
= 0V to V
CC
– 1V
V
CM
= 0V to 44V (Note 7)
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 to GND
V
S
= 3V, Short to V
CC
V
S
= 5V, Short to GND
V
S
= 5V, Short to V
CC
PSRR
I
S
Power Supply Rejection Ratio
Reverse Supply Voltage
Supply Current (Note 5)
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
CONDITIONS
Differential
Common Mode, V
CM
= 0V to 44V
MIN
6
7
0
84
86
200
133
100
400
250
200
TYP
10
15
4
MAX
UNITS
MΩ
MΩ
pF
44
110
98
1300
V
dB
dB
V/mV
V/mV
V/mV
V/mV
V/mV
V/mV
2000
2
480
860
2.95
2.55
4.95
4.30
7
20
12
25
2.985
2.8
4.985
4.75
15
42
25
50
103
40
42
10
875
1600
mV
mV
mV
V
V
V
V
mA
mA
mA
mA
dB
V
V
OH
Output Voltage Swing HIGH
V
S
= 2.7V to 12.5V, V
CM
= V
O
= 1V
I
S
= – 100µA
q
q
90
27
55
60
12
15
5
1
150
µA
µA
µA
nA
µA
µA
µA
µs
µs
kHz
kHz
kHz
V/µs
V/µs
V/µs
Supply Current, SHDN
I
SD
Shutdown Pin Current
Output Leakage Current
Maximum Shutdown Pin Current
t
ON
t
OFF
GBW
Turn-On Time
Turn-Off Time
Gain Bandwidth Product
(Note 4)
Slew Rate
(Note 6)
V
PIN5
= 2V, No Load (Note 5)
V
PIN5
= 0.3V, No Load (Note 5)
V
PIN5
= 2V, No Load (Note 4)
V
PIN5
= 2V, No Load (Note 5)
V
PIN5
= 32V, No Load (Note 4)
V
PIN5
= 5V to 0V, R
L
= 10k
V
PIN5
= 0V to 5V, R
L
= 10k
f = 1kHz
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
q
q
4
0.5
1.1
0.05
27
120
2.5
110
100
90
0.035
0.031
0.030
200
q
q
q
q
SR
0.07
3
LT1636
±15V
ELECTRICAL CHARACTERISTICS
V
S
=
±15V,
V
CM
= 0V, V
OUT
= 0V, Pin 5 = open or V
EE
, Pins 1 and 8 open, T
A
= 25°C unless otherwise noted. (Note 3)
SYMBOL
V
OS
PARAMETER
Input Offset Voltage
CONDITIONS
N8 Package
0°C
≤
T
A
≤
70°C
– 40°C
≤
T
A
≤
85°C
S8 Package
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 8)
N8 Package, – 40°C
≤
T
A
≤
85°C
S8 Package, – 40°C
≤
T
A
≤
85°C
MS8 Package, – 40°C
≤
T
A
≤
85°C
q
q
MIN
TYP
100
MAX
450
550
700
450
750
900
450
850
1000
4
8
10
1.0
10
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
q
q
100
q
q
q
q
q
q
q
1
2
2
0.2
4
1
52
0.035
5.2
13
12000
4
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 to GND
0°C
≤
T
A
≤
70°C
– 40°C
≤
T
A
≤
85°C
V
S
=
±1.35V
to
±22V
0.1Hz to 10Hz
f = 1kHz
f = 1kHz
Differential
Common Mode, V
CM
= – 15V to 14V
q
q
q
q
q
q
q
q
q
q
q
q
q
q
– 15
86
100
75
50
103
500
29
V
dB
V/mV
V/mV
V/mV
V
OL
Output Voltage Swing LOW
– 14.997
– 14.500
– 14.125
14.9
14.5
14.3
±18
±15
±10
90
14.975
14.750
14.650
±30
– 14.95
– 14.07
– 13.35
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
Supply Current
Positive Supply Current, SHDN
114
50
70
85
30
15
8
150
2
µA
µA
µA
nA
µA
µA
µA
kHz
kHz
kHz
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
f = 1kHz
0°C
≤
T
A
≤
70°C
– 40°C
≤
T
A
≤
85°C
q
q
q
q
q
q
q
12
0.7
1.2
27
0.1
125
110
100
220
I
SHDN
Shutdown Pin Current
Maximum Shutdown Pin Current
Output Leakage Current
GBW
Gain Bandwidth Product
4
LT1636
±15V
ELECTRICAL CHARACTERISTICS
V
S
=
±15V,
V
CM
= 0V, V
OUT
= 0V, Pin 5 = open or V
EE
, Pins 1 and 8 open, T
A
= 25°C unless otherwise noted. (Note 3)
SYMBOL
SR
PARAMETER
Slew Rate
CONDITIONS
A
V
= – 1, R
L
=
∞
, V
O
=
±10V
Measured at
±5V
0°C
≤
T
A
≤
70°C
– 40°C
≤
T
A
≤
85°C
q
q
MIN
0.0375
0.033
0.030
TYP
0.075
MAX
UNITS
V/µs
V/µs
V/µs
The
q
denotes specifications that apply over the full specified temperature
range.
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 LT1636C is guaranteed to meet specified performance from
0°C to 70°C and is designed, characterized and expected to meet these
extended temperature limits, but is not tested at –40°C and 85°C. The
LT1636I is guaranteed to meet the extended temperature limits.
Note 4:
V
S
= 5V limits are guaranteed by correlation to V
S
= 3V, and
V
S
=
±15V
or V
S
=
±22V
tests.
Note 5:
V
S
= 3V limits are guaranteed by correlation to V
S
= 5V, and
V
S
=
±15V
or V
S
=
±22V
tests.
Note 6:
Guaranteed by correlation to slew rate at V
S
=
±15V,
and GBW at
V
S
= 3V and V
S
=
±15V
tests.
Note 7:
This specification implies a typical input offset voltage of 600µV at
V
CM
= 44V and a maximum input offset voltage of 3mV at V
CM
= 44V.
Note 8:
This parameter is not 100% tested.
TYPICAL PERFOR A CE CHARACTERISTICS
Supply Current vs Supply Voltage
80
CHANGE IN INPUT OFFSET VOLTAGE (µV)
70
SUPPLY CURRENT (µA)
60
50
40
30
20
10
0
0
5
10 15 20 25 30 35 40
TOTAL SUPPLY VOLTAGE (V)
45
T
A
= 25°C
100
0
–100
T
A
= 125°C
–200
T
A
= 25°C
–300
0
1
2
3
4
TOTAL SUPPLY VOLTAGE (V)
5
1636 G02
INPUT BIAS CURRENT (nA)
T
A
= – 55°C
T
A
= 125°C
Output Saturation Voltage
vs Load Current (Output High)
1
OUTPUT SATURATION VOLTAGE (V)
OUTPUT SATURATION VOLTAGE (V)
V
S
= 5V
V
OD
= 30mV
10
OUTPUT SATURATION VOLTAGE (mV)
0.1
T
A
= 125°C
T
A
= 25°C
T
A
= – 55°C
0.01
0.1
1
10
0.0001 0.001 0.01
SOURCING LOAD CURRENT (mA)
U W
1636 G01
Minimum Supply Voltage
300
200
Input Bias Current
vs Common Mode Voltage
5000
3000
1000
V
S
= 5V, 0V
40
30
20
10
0
–10
4.0
4.4
4.8
5.2 10 20 30 40 50
COMMON MODE VOLTAGE (V)
1636 G03
T
A
= – 55°C
T
A
= 125°C
T
A
= 25°C
T
A
= – 55°C
Output Saturation Voltage
vs Load Current (Output Low)
100
V
S
= 5V
V
OD
= 30mV
1
Output Saturation Voltage
vs Input Overdrive
90
80
70
60
50
40
30
20
10
0
100
1636 G05
V
S
=
±
2.5V
NO LOAD
0.1
T
A
= 125°C
T
A
= 25°C
0.01
T
A
= – 55°C
OUTPUT HIGH
OUTPUT LOW
0
10 20 30 40 50 60 70 80 90 100
INPUT OVERDRIVE (mV)
1636 G06
100
1636 G04
0.001
0.1
1
10
0.0001 0.001 0.01
SINKING LOAD CURRENT (mA)
5
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