1
LT1782
s
Operates with Inputs Above V
+
s
Rail-to-Rail Input and Output
s
Micropower: 55
A Supply Current Max
s
Small SOT-23 Package
s
Low Input Offset Voltage: 800
V Max
s
Single Supply Input Range: 0V to 18V
s
High Output Current: 18mA Min
s
Specified on 3V, 5V and
5V Supplies
s
Output Shutdown on 6-Lead Version
s
Reverse Battery Protection to 18V
s
High Voltage Gain: 1500V/mV
s
Gain Bandwidth Product: 200kHz
s
Slew Rate: 0.07V/
s
s
Operating Temperature Range: 40
C to 85
C
The LT
1782 is a 200kHz op amp available in the small
SOT-23 package that operates on all single and split
supplies with a total voltage of 2.5V to 18V. The amplifier
draws less than 55
A of quiescent current and has reverse
battery protection, drawing negligible current for reverse
supply voltages up to 18V.
The input range of the LT1782 includes ground, and a
unique feature of this device is its Over-The-Top
TM
opera-
tion capability with either or both of its inputs above the
positive rail. The inputs handle 18V both differential and
common mode, independent of supply voltage. The input
stage incorporates phase reversal protection to prevent
false outputs from occurring even when the inputs are 9V
below the negative supply.
The LT1782 can drive loads up to 18mA and still maintain
rail-to-rail capability. A shutdown feature on the 6-lead
version can disable the part, making the output high
impedance and reducing quiescent current to 5
A. The
LT1782 op amp is available in the 5- and 6-lead
SOT-23 packages. For applications requiring higher speed,
refer to the LT1783.
s
Portable Instrumentation
s
Battery- or Solar-Powered Systems
s
Sensor Conditioning
s
Supply Current Sensing
s
Battery Monitoring
s
MUX Amplifiers
s
4mA to 20mA Transmitters
Micropower, Over-The-Top
SOT-23, Rail-to-Rail
Input and Output Op Amp
Over-The-Top is a trademark of Linear Technology Corporation.
+
LT1782
I
LOAD
V
OUT
= 2
(I
LOAD
)
0V TO 4.3V
2k
200
1782 TA01
5V
V
+
5V TO 18V
200
0.2
LOAD
2N3904
Positive Supply Rail Current Sense
APPLICATIO S
U
FEATURES
TYPICAL APPLICATIO
U
DESCRIPTIO
U
, LTC and LT are registered trademarks of Linear Technology Corporation.
Distribution of Input Offset Voltage
900
600
300
0
300
600
900
PERCENTAGE OF AMPLIFIERS
INPUT OFFSET VOLTAGE (
V)
1782 TA01a
25
20
15
10
5
0
V
S
= 5V, 0V
V
CM
= 2.5V
2
LT1782
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
OS
Input Offset Voltage
T
A
= 25
C
400
800
V
0
C
T
A
70
C
q
950
V
Input Offset Voltage Drift (Note 7)
0
C
T
A
70
C
q
2
5
V/
C
I
OS
Input Offset Current
q
0.7
2
nA
V
CM
= 18V (Note 3)
q
1
A
I
B
Input Bias Current
q
8
15
nA
V
CM
= 18V (Note 3)
q
6
12
A
SHDN or V
S
= 0V, V
CM
= 0V to 18V
0.1
nA
Input Bias Current Drift
0
C
T
A
70
C
q
0.01
nA/
C
Input Noise Voltage
0.1Hz to 10Hz
1
V
P-P
e
n
Input Noise Voltage Density
f = 1kHz
50
nV/
Hz
i
n
Input Noise Current Density
f = 1kHz
0.05
pA/
Hz
R
IN
Input Resistance
Differential
3.4
6.5
M
Common Mode, V
CM
= 0V to (V
CC
1V)
5
G
Common Mode, V
CM
= 0V to 18V
1.5
3
M
C
IN
Input Capacitance
5
pF
Input Voltage Range
q
0
18
V
CMRR
Common Mode Rejection Ratio
V
CM
= 0V to V
CC
1V
q
90
100
dB
(Note 3)
V
CM
= 0V to 18V (Note 6)
q
68
80
dB
PSRR
Power Supply Rejection Ratio
V
S
= 3V to 12.5V, V
CM
= V
O
= 1V
q
90
100
dB
A
VOL
Large-Signal Voltage Gain
V
S
= 3V, V
O
= 500mV to 2.5V, R
L
= 10k
200
1500
V/mV
V
S
= 3V, 0
C
T
A
70
C
q
133
V/mV
V
S
= 5V, V
O
= 500mV to 4.5V, R
L
= 10k
400
1500
V/mV
V
S
= 5V, 0
C
T
A
70
C
q
250
V/mV
LT1782CS5
T
JMAX
= 150
C,
JA
= 250
C/ W
ORDER PART
NUMBER
Total Supply Voltage (V
+
to V
) .............................. 18V
Input Differential Voltage ........................................ 18V
Input Pin Voltage to V
............................... + 24V/10V
Shutdown Pin Voltage Above V
............................ 18V
Shutdown Pin Current .......................................
10mA
Output Short-Circuit Duration (Note 2) ........... Indefinite
(Note 1)
ABSOLUTE
M
AXI
M
U
M
RATINGS
W
W
W
U
PACKAGE/ORDER I
N
FOR
M
ATIO
N
W
U
U
ELECTRICAL CHARACTERISTICS
Consult factory for Industrial and Military grade parts.
The
q
denotes specifications which apply over the specified temperature range, otherwise specifications are TA = 25
C.
V
S
= 3V, 0V; V
S
= 5V, 0V, V
CM
= V
OUT
= half supply, for the 6-lead part V
PIN5
= 0V, pulse power tested unless otherwise specified.
Operating Temperature Range (Note 10) 40
C to 85
C
Specified Temperature Range ...................... 0
C to 70
C
Junction Temperature ........................................... 150
C
Storage Temperature Range ................ 65
C to 150
C
Lead Temperature (Soldering, 10 sec)................. 300
C
ORDER PART
NUMBER
4
5
3
1
OUT
V
+IN
V
+
IN
TOP VIEW
S5 PACKAGE
5-LEAD PLASTIC SOT-23
2
+
1
2
3
6
5
4
TOP VIEW
S6 PACKAGE
6-LEAD PLASTIC SOT-23
OUT
V
+IN
V
+
SHDN
IN
+
T
JMAX
= 150
C,
JA
= 230
C/ W
S5 PART MARKING
S6 PART MARKING
LTLD
LT1782CS6
LTIS
3
LT1782
ELECTRICAL CHARACTERISTICS
The
q
denotes specifications which apply over the specified temperature range, otherwise specifications are TA = 25
C.
V
S
= 3V, 0V; V
S
= 5V, 0V, V
CM
= V
OUT
= half supply, for the 6-lead part V
PIN5
= 0V, pulse power tested unless otherwise specified.
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
OL
Output Voltage Swing LOW
No Load
q
3
8
mV
I
SINK
= 5mA
q
200
500
mV
V
S
= 5V, I
SINK
= 10mA
q
400
800
mV
V
OH
Output Voltage Swing HIGH
V
S
= 3V, No Load
q
2.91
2.94
V
V
S
= 3V, I
SOURCE
= 5mA
q
2.6
2.8
V
V
S
= 5V, No Load
q
4.91
4.94
V
V
S
= 5V, I
SOURCE
= 10mA
q
4.5
4.74
V
I
SC
Short-Circuit Current (Note 2)
V
S
= 3V, Short to GND
5
10
mA
V
S
= 3V, Short to V
CC
15
30
mA
V
S
= 5V, Short to GND
15
30
mA
V
S
= 5V, Short to V
CC
20
40
mA
Minimum Supply Voltage
q
2.5
2.7
V
Reverse Supply Voltage
I
S
= 100
A
q
18
V
I
S
Supply Current
40
55
A
(Note 4)
q
60
A
Supply Current, SHDN
V
PIN5
= 2V, No Load (Note 8)
q
5
15
A
I
SHDN
Shutdown Pin Current
V
PIN5
= 0.3V, No load (Note 8)
q
0.5
nA
V
PIN5
= 2V, No Load (Note 8)
q
2
8
A
V
PIN5
= 5V, No Load (Note 8)
q
5
A
Shutdown Output Leakage Current
V
PIN5
= 2V, No Load (Note 8)
q
0.05
1
A
Maximum Shutdown Pin Current
V
PIN5
= 18V, No Load (Note 8)
q
10
30
A
V
L
Shutdown Pin Input Low Voltage
(Note 8)
q
0.3
V
V
H
Shutdown Pin Input High Voltage
(Note 8)
q
2
V
t
ON
Turn-On Time
V
PIN5
= 5V to 0V, R
L
= 10k (Note 8)
100
s
t
OFF
Turn-Off Time
V
PIN5
= 0V to 5V, R
L
= 10k (Note 8)
6
s
GBW
Gain Bandwidth Product
f = 5kHz
110
200
kHz
(Note 3)
0
C
T
A
70
C
q
100
kHz
SR
Slew Rate
A
V
= 1, R
L
=
0.035
0.07
V/
s
(Note 5)
0
C
T
A
70
C
q
0.031
V/
s
t
S
Settling Time
V
S
= 5V,
V
OUT
= 2V to 0.1%, A
V
= 1
45
s
THD
Distortion
V
S
= 3V, V
O
= 2V
PP
, A
V
= 1, R
L
= 10k, f =1kHz
0.003
%
FPBW
Full-Power Bandwidth (Note 9)
V
OUT
= 2V
PP
11
kHz
V
S
=
5V, V
CM
= 0V,V
OUT
= 0V, for the 6-lead part V
SHDN
= V
V
OS
Input Offset Voltage
T
A
= 25
C
500
900
V
0
C
T
A
70
C
q
1050
V
Input Offset Voltage Drift (Note 7)
0
C
T
A
70
C
q
2
5
V/
C
I
OS
Input Offset Current
q
0.7
2
nA
I
B
Input Bias Current
q
8
15
nA
Input Bias Current Drift
0
C
T
A
70
C
q
0.01
nA/
C
Input Noise Voltage
0.1Hz to 10Hz
1
V
P-P
e
n
Input Noise Voltage Density
f = 1kHz
50
nV/
Hz
i
n
Input Noise Current Density
f = 1kHz
0.05
pA/
Hz
4
LT1782
ELECTRICAL CHARACTERISTICS
The
q
denotes specifications which apply over the specified temperature range, otherwise specifications are TA = 25
C.
V
S
=
5V, V
CM
= 0V,V
OUT
= 0V, for the 6-lead part V
SHDN
= V
, unless otherwise specified.
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
R
IN
Input Resistance
Differential
q
3.4
6.5
M
Common Mode, V
CM
= 5V to 13V
q
1.5
3
M
C
IN
Input Capacitance
5
pF
Input Voltage Range
q
5
13
V
CMRR
Common Mode Rejection Ratio
V
CM
= 5V to 13V
q
68
80
dB
A
VOL
Large-Signal Voltage Gain
V
O
=
4V, R
L
= 10k
55
150
V/mV
0
C
T
A
70
C
q
40
V/mV
V
OL
Output Voltage Swing LOW
No Load
q
4.997
4.992
V
I
SINK
= 5mA
q
4.8
4.5
V
I
SINK
= 10mA
q
4.6
4.2
V
V
OH
Output Voltage Swing HIGH
No Load
q
4.91
4.94
V
I
SOURCE
= 5mA
q
4.6
4.8
V
I
SOURCE
= 10mA
q
4.5
4.74
V
I
SC
Short-Circuit Current (Note 2)
Short to GND
18
30
mA
0
C
T
A
70
C
q
15
mA
PSRR
Power Supply Rejection Ratio
V
S
=
1.5V to
9V
q
90
100
dB
I
S
Supply Current
45
60
A
q
65
A
Supply Current, SHDN
V
PIN5
= 3V, V
S
=
5V, No Load (Note 8)
q
6
20
A
I
SHDN
Shutdown Pin Current
V
PIN5
= 4.7V, V
S
=
5V, No load (Note 8)
q
0.5
nA
V
PIN5
= 3V, V
S
=
5V, No Load (Note 8)
q
2
8
A
Maximum Shutdown Pin Current
V
PIN5
= 9V, V
S
=
9V (Note 8)
q
10
30
A
Shutdown Output Leakage Current
V
PIN5
= 7V, V
S
=
9V, No Load (Note 8)
q
0.05
1
A
V
L
Shutdown Pin Input Low Voltage
V
S
=
5V (Note 8)
q
4.7
V
V
H
Shutdown Pin Input High Voltage
V
S
=
5V (Note 8)
q
3
V
t
ON
Turn-On Time
V
PIN5
= 0V to 5V, R
L
= 10k (Note 8)
q
100
s
t
OFF
Turn-Off Time
V
PIN5
= 5V to 0V, R
L
= 10k (Note 8)
q
6
s
GBW
Gain Bandwidth Product
f = 5kHz
120
225
kHz
0
C
T
A
70
C
q
110
kHz
SR
Slew Rate
A
V
= 1, R
L
=
, V
O
=
4V, Measured at V
O
=
2V
0.0375
0.075
V/
s
0
C
T
A
70
C
q
0.033
V/
s
t
S
Settling Time
V
OUT
= 4V to 0.1%, A
V
= 1
50
s
FPBW
Full-Power Bandwidth (Note 9)
V
OUT
= 8V
PP
3
kHz
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: V
S
= 5V limits are guaranteed by correlation to V
S
= 3V and
V
S
=
5V or V
S
=
9V tests.
Note 4: V
S
= 3V limits are guaranteed by correlation to V
S
= 5V and
V
S
=
5V or V
S
=
9V tests.
Note 5: Guaranteed by correlation to slew rate at V
S
=
5V, and GBW at
V
S
= 3V and V
S
=
5V tests.
Note 6: This specification implies a typical input offset voltage of 1.8mV at
V
CM
= 18V and a maximum input offset voltage of 7.2mV at V
CM
= 18V.
Note 7: This parameter is not 100% tested.
Note 8: Specifications apply to 6-lead SOT-23 with shutdown.
Note 9: Full-power bandwidth is calculated for the slew rate.
FPBW = SR/2
V
P
.
Note 10: The LT1782 is guaranteed functional over the operating
temperature range 40
C to 85
C.
5
LT1782
TYPICAL PERFOR A CE CHARACTERISTICS
U
W
Supply Current vs Supply Voltage
Minimum Supply Voltage
Input Bias Current vs Common
Mode Voltage
Output Saturation Voltage vs Load
Current (Output High)
Output Saturation Voltage vs Load
Current (Output Low)
Output Saturation Voltage vs
Input Overdrive
SUPPLY VOLTAGE (V)
2
6
10
14
4
8
12
16
18
SUPPLY CURRENT (
A)
1782 G01
50
45
40
35
30
25
20
T
A
= 125
C
T
A
= 25
C
T
A
= 55
C
TOTAL SUPPLY VOLTAGE (V)
0
1
2
3
4
5
INPUT OFFSET VOLTAGE CHANGE (
V)
1782 G02
400
300
200
100
0
100
200
300
400
T
A
= 125
C
T
A
= 55
C
T
A
= 25
C
COMMON MODE VOLTAGE (V)
3.8 4 4.2 4.4 4.6 4.8 5 5.2 5.4
15 16 18
INPUT BIAS CURRENT (nA)
1782 G03
6000
5000
4000
3000
2000
1000
40
30
20
10
0
10
T
A
= 125
C
V
S
= 5V, 0V
T
A
= 55
C
T
A
= 25
C
1
0.01
OUTPUT SATURATION VOLTAGE (V)
0.1
1
100
10
1m
10m
1782 G04
T
A
= 125
C
V
S
=
2.5V
V
OD
= 30mV
T
A
= 55
C
T
A
= 25
C
SOURCING LOAD CURRENT (A)
SINKING LOAD CURRENT (A)
0.01
OUTPUT SATURATION VOLTAGE (V)
0.1
1
1
1m
10m
1782 G05
0.001
10
1
T
A
= 125
C
T
A
= 55
C
T
A
= 25
C
V
S
=
2.5V
V
OD
= 30mV
INPUT OVERDRIVE (mV)
0
OUTPUT SATURATION VOLTAGE (mV)
100
10
1
1782 G06
10
20
30
40
50
60
OUTPUT HIGH
OUTPUT LOW
V
S
=
2.5V
NO LOAD
0.1Hz to 10Hz Noise Voltage
TIME (sec)
NOISE VOLTAGE (400nV/DIV)
1782 G07
V
S
=
2.5V
0
1
2
3
4
5
6
7
8
9
10
V
IN
(V)
108
6 8 10 12 14 16 18
V
OUT
(V)
1782 G02a
5
4
3
2
1
0
V
S
= 5V, 0V
6 4
0 2
2
4
V
IN
5V
+
Output Voltage vs Large Input
Voltage
TEMPERATURE (
C)
50
25
0
25
50
75
100
125
OUTPUT CURRENT (mA)
1782 G06a
40
35
30
25
20
15
V
S
=
5V
SINKING CURRENT
SOURCING CURRENT
Output Short-Circuit Current vs
Temperature
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