LT1782
1
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TYPICAL APPLICATION
DESCRIPTION
Micropower, Over-The-Top
SOT-23, Rail-to-Rail
Input and Output Op Amp
The LT
®
1782 is a 200kHz op amp available in the small
SOT-23 package that operates on all single and split sup-
plies with a total voltage of 2.5V to 18V. The amplifi er
draws less than 55µA 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™ 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 5µA. The
LT1782 op amp is available in the 5- and 6-lead SOT-23
packages. For applications requiring higher speed, refer
to the LT1783.
Positive Supply Rail Current Sense
FEATURES
APPLICATIONS
n Operates with Inputs Above V+
n Rail-to-Rail Input and Output
n Micropower: 55μA Supply Current Max
n Operating Temperature Range: –40°C to 125°C
n Low Profi le (1mm) ThinSOT™ Package
n Low Input Offset Voltage: 800µV Max
n Single Supply Input Range: 0V to 18V
n High Output Current: 18mA Min
n Specifi ed on 3V, 5V and ±5V Supplies
n Output Shutdown on 6-Lead Version
n Reverse Battery Protection to 18V
n High Voltage Gain: 1500V/mV
n Gain Bandwidth Product: 200kHz
n Slew Rate: 0.07V/µs
n Portable Instrumentation
n Battery- or Solar-Powered Systems
n Sensor Conditioning
n Supply Current Sensing
n Battery Monitoring
n MUX Amplifi ers
n 4mA to 20mA Transmitters
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. ThinSOT and Over-The-Top are trademarks of Linear Technology
Corporation. All other trademarks are the property of their respective owners.
Distribution of Input Offset Voltage
–
+
LT1782
ILOAD
VOUT = 2(ILOAD)
0V TO 4.3V
2k
200
1782 TA01a
5V
V+
5V TO 18V
200
0.2
LOAD
MMBT3904
–900 –600 –300 0 300 600 900
PERCENTAGE OF AMPLIFIERS
INPUT OFFSET VOLTAGE (µV)
1782 TA01b
25
20
15
10
5
0
VS = 5V, 0V
VCM = 2.5V
LT1782
2
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ABSOLUTE MAXIMUM RATINGS
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) ........... Indefi nite
Operating Temperature Range (Note 3)
LT1782C ...............................................–40°C to 85°C
LT1782I ................................................–40°C to 85°C
LT1782H ............................................–40°C to 125°C
(Note 1)
4
5
3
1
OUT
V–
+IN
V+
–IN
TOP VIEW
S5 PACKAGE
5-LEAD PLASTIC TSOT-23
2
+–
TJMAX = 150°C, θJA = 250°C/W
1
2
3
6
5
4
TOP VIEW
S6 PACKAGE
6-LEAD PLASTIC TSOT-23
OUT
V–
+IN
V+
SHDN
–IN
+–
TJMAX = 150°C, θJA = 230°C/W
PIN CONFIGURATION
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION SPECIFIED TEMPERATURE RANGE
LT1782CS5#PBF LT1782CS5#TRPBF LTLD 5-Lead Plastic TSOT-23 0°C to 70°C
LT1782IS5#PBF LT1782IS5#TRPBF LTLE 5-Lead Plastic TSOT-23 –40°C to 85°C
LT1782HS5#PBF LT1782HS5#TRPBF LTXK 5-Lead Plastic TSOT-23 –40°C to 125°C
LT1782CS6#PBF LT1782CS6#TRPBF LTIS 6-Lead Plastic TSOT-23 0°C to 70°C
LT1782IS6#PBF LT1782IS6#TRPBF LTIT 6-Lead Plastic TSOT-23 –40°C to 85°C
LT1782HS6#PBF LT1782HS6#TRPBF LTXL 6-Lead Plastic TSOT-23 –40°C to 125°C
Consult LTC Marketing for parts specifi ed with wider operating temperature ranges.
Consult LTC Marketing for information on non-standard lead based fi nish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifi cations, go to: http://www.linear.com/tapeandreel/
Specifi ed Temperature Range (Note 4)
LT1782C ...............................................–40°C to 85°C
LT1782I ................................................–40°C to 85°C
LT1782H ............................................–40°C to 125°C
Junction Temperature........................................... 150°C
Storage Temperature Range ................... –65°C to 150°C
Lead Temperature (Soldering, 10 sec) .................. 300°C
LT1782
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ELECTRICAL CHARACTERISTICS
The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at TA = 25°C. VS = 3V, 0V; VS = 5V, 0V, VCM = VOUT = half supply, for the 6-lead part
VPIN5 = 0V, pulse power tested unless otherwise specifi ed.
SYMBOL PARAMETER CONDITIONS
LT1782C/LT1782I
UNITSMIN TYP MAX
VOS Input Offset Voltage TA = 25°C
0°C ≤ TA ≤ 70°C
–40°C ≤ TA ≤ 85°C
l
l
400
800
950
1100
µV
µV
µV
ΔVOS/ΔTInput Offset Voltage Drift (Note 7) l 25 µV/°C
IOS Input Offset Current
VCM = 18V (Note 5)
l
l
0.7 2
1
nA
µA
IB Input Bias Current
VCM = 18 (Note 5)
SHDN or VS = 0V, VCM = 0V to 18V
l
l
8
6
0.1
15
12
nA
µA
nA
Input Bias Current Drift –40°C ≤ TA ≤ 85°C l0.01 nA/°C
Input Noise Voltage 0.1Hz to 10Hz 1 µVP-P
enInput Noise Voltage Density f = 1kHz 50 nV/√Hz
inInput Noise Current Density f = 1kHz 0.05 pA/√Hz
RIN Input Resistance Differential
Common Mode, VCM = 0V to (VCC – 1V)
Common Mode, VCM = 0V to 18V
l
l
3.4
1.5
6.5
5
3
MΩ
GΩ
MΩ
CIN Input Capacitance 5pF
Input Voltage Range l0 18 V
CMRR Common Mode Rejection Ratio
(Note 5)
VCM = 0V to VCC – 1V
VCM = 0V to 18V (Note 8)
l
l
90
68
100
80
dB
dB
PSRR Power Supply Rejection Ratio VS = 3V to 12.5V, VCM = VO = 1V l 90 100 dB
AVOL Large-Signal Voltage Gain VS = 3V, VO = 500mV to 2.5V, RL = 10k
VS = 3V, 0°C ≤ TA ≤ 70°C
VS = 3V, –40°C ≤ TA ≤ 85°C
l
l
200
133
100
1500 V/mV
V/mV
V/mV
VS = 5V, VO = 500mV to 4.5V, RL = 10k
VS = 5V, 0°C ≤ TA ≤ 70°C
VS = 5V, –40°C ≤ TA ≤ 85°C
l
l
400
250
200
500 V/mV
V/mV
V/mV
VOL Output Voltage Swing LOW No Load
ISINK = 5mA
VS = 5V, ISINK = 10mA
l
l
l
3
200
400
8
500
800
mV
mV
mV
VOH Output Voltage Swing HIGH VS = 3V, No Load
VS = 3V, ISOURCE = 5mA
l
l
2.91
2.6
2.94
2.8
V
V
VS = 5V, No Load
VS = 5V, ISOURCE = 10mA
l
l
4.91
4.5
4.94
4.74
V
V
ISC Short-Circuit Current (Note 2) VS = 3V, Short to GND
VS = 3V, Short to VCC
5
15
10
30
mA
mA
VS = 5V, Short to GND
VS = 5V, Short to VCC
15
20
30
40
mA
mA
Minimum Supply Voltage l2.7 V
Reverse Supply Voltage IS = –100µA l18 V
ISSupply Current
(Note 6) 0°C ≤ TA ≤ 70°C
–40°C ≤ TA ≤ 85°C
l
l
40 55
60
65
µA
µA
µA
Supply Current, SHDN VPIN5 = 2V, No Load (Note 10) l515 µA
LT1782
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ELECTRICAL CHARACTERISTICS
The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at TA = 25°C. VS = 3V, 0V; VS = 5V, 0V, VCM = VOUT = half supply, for the 6-lead part
VPIN5 = 0V, pulse power tested unless otherwise specifi ed.
SYMBOL PARAMETER CONDITIONS
LT1782C/LT1782I
UNITSMIN TYP MAX
ISHDN Shutdown Pin Current VPIN5 = 0.3V, No Load (Note 10)
VPIN5 = 2V, No Load (Note 10)
VPIN5 = 5V, No Load (Note 10)
l
l
l
0.5
2
5
8
nA
µA
µA
Shutdown Output Leakage Current VPIN5 = 2V, No Load (Note 10) l0.05 1 µA
Maximum Shutdown Pin Current VPIN5 = 18V, No Load (Note 10) l10 30 µA
VLShutdown Pin Input Low Voltage (Note 10) l0.3 V
VHShutdown Pin Input High Voltage (Note 10) l2V
tON Turn-On Time VPIN5 = 5V to 0V, RL = 10k (Note 10) 100 µs
tOFF Turn-Off Time VPIN5 = 0V to 5V, RL = 10k (Note 10) 6 µs
GBW Gain Bandwidth Product
(Note 5)
f = 5kHz
0°C ≤ TA ≤ 70°C
–40°C ≤ TA ≤ 85°C
l
l
110
100
90
200 kHz
kHz
kHz
SR Slew Rate
(Note 5)
AV = –1, RL = ∞
0°C ≤ TA ≤ 70°C
–40°C ≤ TA ≤ 85°C
l
l
0.035
0.031
0.028
0.07 V/µs
V/µs
V/µs
tSSettling Time VS = 5V, ΔVOUT = 2V to 0.1%, AV = –1 45 µs
THD Distortion VS = 3V, VO = 2VP-P, AV = 1, RL = 10k, f = 1kHz 0.003 %
FPBW Full-Power Bandwidth (Note 9) VOUT = 2VP-P 11 kHz
The l denotes the specifi cations which apply over the full operating temperature range, otherwise specifi cations are at TA = 25°C.
VS = ±5V, VCM = 0V, VOUT = 0V, for the 6-lead part VPIN5 = V–, pulse power tested unless otherwise specifi ed.
SYMBOL PARAMETER CONDITIONS
LT1782C/LT1782I
UNITSMIN TYP MAX
VOS Input Offset Voltage TA = 25°C
0°C ≤ TA ≤ 70°C
–40°C ≤ TA ≤ 85°C
l
l
500
900
1050
1200
µV
µV
µV
ΔVOS/ΔTInput Offset Voltage Drift (Note 7) l 25 µV/°C
IOS Input Offset Current l 0.7 2 nA
IB Input Bias Current l 815 nA
Input Bias Current Drift l0.01 nA/°C
Input Noise Voltage 0.1Hz to 10Hz 1 µVP-P
enInput Noise Voltage Density f = 1kHz 50 nV/√Hz
inInput Noise Current Density f = 1kHz 0.05 pA/√Hz
RIN Input Resistance Differential
Common Mode, VCM = –5V to 13V
l
l
3.4
1.5
6.5
3
MΩ
MΩ
CIN Input Capacitance 5pF
Input Voltage Range l–5 13 V
CMRR Common Mode Rejection Ratio VCM = –5V to 13V l 68 80 dB
AVOL Large-Signal Voltage Gain VO = ±4V, RL = 10k
0°C ≤ TA ≤ 70°C
–40°C ≤ TA ≤ 85°C
l
l
55
40
30
150 V/mV
V/mV
V/mV
LT1782
5
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SYMBOL PARAMETER CONDITIONS
LT1782C/LT1782I
UNITSMIN TYP MAX
VOL Output Voltage Swing LOW No Load
ISINK = 5mA
ISINK = 10mA
l
l
l
–4.997
–4.8
–4.6
–4.992
–4.5
–4.2
V
V
V
VOH Output Voltage Swing HIGH No Load
ISINK = 5mA
ISINK = 10mA
l
l
l
4.91
4.6
4.5
4.94
4.8
4.74
V
V
V
ISC Short-Circuit Current (Note 2) Short to GND
0°C ≤ TA ≤ 70°C l
18
15
30 mA
mA
PSRR Power Supply Rejection Ratio VS = ±1.5V to ±9V l 90 100 dB
ISSupply Current
0°C ≤ TA ≤ 70°C
–40°C ≤ TA ≤ 85°C
l
l
45 60
65
70
µA
µA
µA
Supply Current, SHDN VPIN5 = –3V, VS = ±5V, No Load (Note 10) l620 µA
ISHDN Shutdown Pin Current VPIN5 = –4.7V, VS = ±5V, No Load (Note 10)
VPIN5 = –3V, VS = ±5V, No Load (Note 10)
l
l
0.5
28
nA
µA
Maximum Shutdown Pin Current VPIN5 = 9V, VS = ±9V (Note 10) l10 30 µA
Shutdown Output Leakage Current VPIN5 = –7V, VS = ±9V, No Load (Note 10) l0.05 1 µA
VLShutdown Pin Input Low Voltage VS = ±5V (Note 10) l–4.7 V
VHShutdown Pin Input High Voltage VS = ±5V (Note 10) l–3 V
tON Turn-On Time VPIN5 = 0V to –5V, RL = 10k (Note 10) l100 µs
tOFF Turn-Off Time VPIN5 = –5V to 0V, RL = 10k (Note 10) l6 µs
GBW Gain Bandwidth Product f = 5kHz
0°C ≤ TA ≤ 70°C
–40°C ≤ TA ≤ 85°C
l
l
120
110
100
225 kHz
kHz
kHz
SR Slew Rate AV = –1, RL = ∞, VO = ±4V, Measured at VO = ±2V
0°C ≤ TA ≤ 70°C
–40°C ≤ TA ≤ 85°C
l
l
0.0375
0.033
0.030
0.075 V/µs
V/µs
V/µs
tSSettling Time ΔVOUT = 4V to 0.1%, AV = 1 50 µs
FPBW Full-Power Bandwidth (Note 9) VOUT = 8VP-P 3kHz
ELECTRICAL CHARACTERISTICS
The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at TA = 25°C. VS = ±5V, VCM = 0V, VOUT = 0V, for the 6-lead part VPIN5 = V–, pulse
power tested unless otherwise specifi ed.
The l denotes the specifi cations which apply over the full operating temperature range of –40°C ≤ TA ≤ 125°C. VS = 3V, 0V; VS = 5V, 0V;
VCM = VOUT = half supply, for the 6-lead part VPIN5 = 0V, pulse power tested unless otherwise specifi ed. (Note 4)
SYMBOL PARAMETER CONDITIONS
LT1782H
UNITSMIN TYP MAX
VOS Input Offset Voltage
l
400 800
3
µV
mV
ΔVOS/ΔTInput Offset Voltage Drift l 15 µV/°C
IOS Input Offset Current
VCM = 18V (Note 5)
l
l
3
2
nA
µA
IB Input Bias Current
VCM = 18V (Note 5)
l
l
30
25
nA
µA
Input Voltage Range l0.3 18 V
CMRR Common Mode Rejection Ratio VCM = 0.3V to VCC – 1V
VCM = 0.3V to 18V
l
l
76
60
dB
dB
LT1782
6
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SYMBOL PARAMETER CONDITIONS
LT1782H
UNITSMIN TYP MAX
AVOL Large-Signal Voltage Gain VS = 3V, VO = 500mV to 2.5V, RL = 10k
l
200
50
1500 V/mV
V/mV
VS = 5V, VO = 500mV to 4.5V, RL = 10k
l
400
80
1500 V/mV
V/mV
VOL Output Voltage Swing LOW No Load
ISINK = 5mA
VS = 5V, ISINK = 10mA
l
l
l
15
900
1500
mV
mV
mV
VOH Output Voltage Swing HIGH VS = 3V, No Load
VS = 3V, ISOURCE = 5mA
l
l
2.85
2.20
V
V
VS = 5V, No Load
VS = 5V, ISOURCE = 10mA
l
l
4.85
3.80
V
V
PSRR Power Supply Rejection Ratio VS = 3V to 12.5V, VCM = VO = 1V l 80 dB
Minimum Supply Voltage l2.7 V
Reverse Supply Voltage IS = –100µA l18 V
ISSupply Current
l
40 55
100
µA
µA
Supply Current, SHDN VPIN5 = 2V, No Load (Note 10) l25 µA
ISHDN Shutdown Pin Current VPIN5 = 0.3V, No Load (Note 10)
VPIN5 = 2V, No Load (Note 10)
l
l
0.5
12
nA
µA
Output Leakage Current VPIN5 = 2V, No Load (Note 10) l3µA
Maximum Shutdown Pin Current VPIN5 = 18V, No Load l45 µA
VLShutdown Pin Input Low Voltage (Note 10) l0.3 V
VHShutdown Pin Input High Voltage (Note 10) l2V
GBW Gain Bandwidth Product f = 10kHz (Note 5)
l
110
65
200 kHz
kHz
SR Slew Rate AV = –1, RL = ∞ (Note 7)
l
0.035
0.020
0.07 V/µs
V/µs
ELECTRICAL CHARACTERISTICS
The l denotes the specifi cations which apply over the full operating
temperature range of –40°C ≤ TA ≤ 125°C. VS = 3V, 0V; VS = 5V, 0V; VCM = VOUT = half supply, for the 6-lead part VPIN5 = 0V, pulse power
tested unless otherwise specifi ed. (Note 4)
The l denotes the specifi cations which apply over the full operating temperature range of –40°C ≤ TA ≤ 125°C.
VS = ±5V, VCM = 0V, VOUT = 0V, for the 6-lead part VPIN5 = V–, pulse power tested unless otherwise specifi ed. (Note 4)
SYMBOL PARAMETER CONDITIONS
LT1782H
UNITSMIN TYP MAX
VOS Input Offset Voltage
l
500 900
3.2
µV
mV
ΔVOS/ΔTInput Offset Voltage Drift (Note 9) l 15 µV/°C
IOS Input Offset Current l 3nA
IB Input Bias Current l 30 nA
CMRR Common Mode Rejection Ratio VCM = –4.7V to 13V l 60 dB
AVOL Large-Signal Voltage Gain VS = ±4V, RL = 10k
l
55
20
150 V/mV
V/mV
VOOutput Voltage Swing No Load
ISINK = ±5mA
ISINK = ±10mA
l
l
l
±4.85
±4.10
±3.50
V
V
V
LT1782
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SYMBOL PARAMETER CONDITIONS
LT1782H
UNITSMIN TYP MAX
PSRR Power Supply Rejection Ratio VS = ±1.5V to ±9V l 80 dB
Minimum Supply Voltage l±1.35 V
ISSupply Current
l
45 60
110
µA
µA
Supply Current, SHDN VPIN5 = –3V, VS = ±5V, No Load (Note 10) l25 µA
ISHDN Shutdown Pin Current VPIN5 = –4.7V, VS = ±5V, No Load (Note 10)
VPIN5 = –3V, VS = ±5V, No Load (Note 10)
l
l
0.5
12
nA
µA
Maximum Shutdown Pin Current VPIN5 = 9V, VS = ±9V, No Load (Note 10) l45 µA
Output Leakage Current VPIN5 = –7V, VS = ±9V, No Load l3µA
VLShutdown Pin Input Low Voltage VS = ±5V l–4.7 V
VHShutdown Pin Input High Voltage VS = ±5V l–3 V
GBW Gain Bandwidth Product f = 5kHz
l
120
70
225 kHz
kHz
SR Slew Rate AV = –1, RL = ∞, VO = ±4V
Measured at VO = ±2V l
0.0375
0.0220
0.075 V/µs
V/µs
ELECTRICAL CHARACTERISTICS
The l denotes the specifi cations which apply over the full operating
temperature range of –40°C ≤ TA ≤ 125°C. VS = ±5V, VCM = 0V, VOUT = 0V, for the 6-lead part VPIN5 = V–, pulse power tested unless
otherwise specifi ed. (Note 4)
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: A heat sink may be required to keep the junction temperature
below absolute maximum.
Note 3: The LT1782C and LT1782I are guaranteed functional over the
operating temperature range of –40°C to 85°C. The LT1782H is guaranteed
functional over the operating temperature range of –40°C to 125°C.
Note 4: The LT1782C is guaranteed to meet specifi ed performance from
0°C to 70°C. The LT1782C is designed, characterized and expected to
meet specifi ed performance from –40°C to 85°C but is not tested or
QA sampled at these temperatures. The LT1782I is guaranteed to meet
specifi ed performance from – 40°C to 85°C. The LT1782H is guaranteed to
meet specifi ed performance from –40°C to 125°C.
Note 5: VS = 5V limits are guaranteed by correlation to VS = 3V and
VS = ±5V or VS = ±9V tests.
Note 6: VS = 3V limits are guaranteed by correlation to VS = 5V and
VS = ±5V or VS = ±9V tests.
Note 7: Guaranteed by correlation to slew rate at VS = ±5V, and GBW at
VS = 3V and VS = ±5V tests.
Note 8: This specifi cation implies a typical input offset voltage of 1.8mV at
VCM = 18V and a maximum input offset voltage of 7.2mV at VCM = 18V.
Note 9: This parameter is not 100% tested.
Note 10: Specifi cations apply to 6-lead SOT-23 with shutdown.
Note 11: Full-power bandwidth is calculated for the slew rate.
FPBW = SR/2VP.
LT1782
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TYPICAL PERFORMANCE CHARACTERISTICS
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
Output Short-Circuit Current
vs Temperature 0.1Hz to 10Hz Noise Voltage
Supply Current vs Supply Voltage Minimum Supply Voltage
Output Voltage
vs Large Input Voltage
SUPPLY VOLTAGE (V)
26 10 144 8 12 16 18
SUPPLY CURRENT (µA)
1782 G01
50
45
40
35
30
25
20
TA = 125°C
TA = 25°C
TA = –55°C
TOTAL SUPPLY VOLTAGE (V)
01 2 3 4 5
INPUT OFFSET VOLTAGE CHANGE (µV)
1782 G02
400
300
200
100
0
–100
–200
–300
–400
TA = 125°C TA = –55°C
TA = 25°C
VIN (V)
–10–8 6 8 10 12 14 16 18
VOUT (V)
1782 G03
5
4
3
2
1
0
VS = 5V, 0V
–6 –4 0 2–2 4
VIN
5V
–
+
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 G04
6000
5000
4000
3000
2000
1000
40
30
20
10
0
–10
TA = 125°C
VS = 5V, 0V
TA = –55°C
TA = 25°C
1µ
0.01
OUTPUT SATURATION VOLTAGE (V)
0.1
1
100µ10µ 1m 10m
1782 G05
TA = 125°C
VS = ±2.5V
VOD = 30mV
TA = –55°C
TA = 25°C
SOURCING LOAD CURRENT (A) SINKING LOAD CURRENT (A)
0.01
OUTPUT SATURATION VOLTAGE (V)
0.1
1µ 1µ 1m 10m
1782 G06
0.001 10µ
1
TA = 125°C
TA = –55°C
TA = 25°C
VS = ±2.5V
VOD = 30mV
INPUT OVERDRIVE (mV)
0
OUTPUT SATURATION VOLTAGE (mV)
100
10
1
1782 G07
10 20 30 40 50 60
OUTPUT HIGH
OUTPUT LOW
VS = ±2.5V
NO LOAD
TEMPERATURE (°C)
–50 –25 0 25 50 75 100 125
OUTPUT CURRENT (mA)
1782 G08
40
35
30
25
20
15
VS = ±5V
SINKING CURRENT
SOURCING CURRENT
TIME (sec)
NOISE VOLTAGE (400nV/DIV)
1782 G09
VS = ±2.5V
012345678910
LT1782
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TYPICAL PERFORMANCE CHARACTERISTICS
Gain Bandwidth Product
vs Temperature Slew Rate vs Temperature
Gain Bandwidth Product and
Phase Margin vs Supply Voltage
Gain Bandwidth Product and
Phase Margin vs Load Resistance PSRR vs Frequency CMRR vs Frequency
Noise Voltage Density
vs Frequency Input Noise Current vs Frequency
Gain and Phase Shift
vs Frequency
FREQUENCY (Hz)
INPUT NOISE VOLTAGE DENSITY (nV/√Hz)
80
70
60
50
40
30
20 1 100 1k 10k
1782 G10
10
FREQUENCY (Hz)
INPUT NOISE CURRENT DENSITY (pA/√Hz)
0.40
0.35
0.30
0.25
0.20
0.15
0.10
0.05
01 100 1k 10k
1782 G11
10
VS = ±2.5V
FREQUENCY (Hz)
1k
GAIN (dB)
70
60
50
40
30
20
10
0
–10
–20
–30
PHASE SHIFT (DEG)
100
80
60
40
20
0
–20
–40
–60
–80
–100
10k 100k 1M
1782 G12
VS = ±2.5V
PHASE
GAIN
TEMPERATURE (°C)
–50 –25 0 25 50 75 100 125
GAIN BANDWIDTH (kHz)
1782 G13
230
220
210
200
190
180
170
f = 5kHz
VS = ±2.5V
TEMPERATURE (°C)
–50 –25 0 25 50 75 100 125
SLEW RATE (V/µs)
1782 G14
0.11
0.10
0.09
0.08
0.07
0.06
0.05
0.04
VS = ±2.5V
RISING
FALLING
TOTAL SUPPLY VOLTAGE (V)
02 4 6 8 10 12 14 16 18
GAIN BAINDWIDTH PRODUCT (kHz)
PHASE MARGIN (DEG)
1782 G15
240
220
200
180
160
60
55
50
AV = –1
RF = RG = 10k
f = 5kHz
PHASE MARGIN
GAIN BANDWIDTH PRODUCT
LOAD RESISTANCE (Ω)
1k
GAIN BANDWIDTH PRODUCT (kHz)
250
200
150
100
50
PHASE MARGIN (DEG)
70
60
50
10k 100k
1782 G16
VS = ±2.5V
AV = –1
RF = RG = 10k
f = 5kHz
PHASE MARGIN
GAIN BANDWIDTH PRODUCT
FREQUENCY (Hz)
1k
POWER SUPPLY REJECTION RATIO (dB)
90
80
70
60
50
40
30
20
10
0
–10
10k 100k 1M
1782 G17
VS = ±2.5V
POSITIVE SUPPLY
NEGATIVE SUPPLY
FREQUENCY (Hz)
1k
COMMON MODE REJECTION RATIO (dB)
110
100
90
80
70
60
50
40
30 10k 100k
1782 G18
VS = ±2.5V
LT1782
10
1782fb
TYPICAL PERFORMANCE CHARACTERISTICS
Capacitive Load Handling
Overshoot vs Capacitive Load
Undistorted Output Swing
vs Frequency
Total Harmonic Distortion + Noise
vs Frequency
Total Harmonic Distortion + Noise
vs Load Resistance
Total Harmonic Distortion + Noise
vs Output Voltage Amplitude Open-Loop Gain
Output Impedance vs Frequency
Disabled Output Impedance
vs Frequency (Note 8)
Settling Time to 0.1%
vs Output Step
FREQUENCY (Hz)
100
0.1
OUTPUT IMPEDANCE (Ω)
10
10k
10k1k 100k 1M
1782 G19
1
100
1k AV = 100
VS = ±2.5V
AV = 10
AV = 1
FREQUENCY (Hz)
100
100
OUTPUT IMPEDANCE (Ω)
10k
1M
1k 10k 100k 1M
1782 G20
1k
100k
VS = ±2.5V
VPIN5 (SHUTDOWN) = 2.5V
SETTLING TIME (µs)
25 30 35 40 50 60 70 80
OUTPUT STEP (V)
1782 G21
4
3
2
1
0
–1
–2
–3
–4
AV = 1 AV = –1
AV = 1 AV = –1
VS = ±5V
CAPACITIVE LOAD (pF)
10
OVERSHOOT (%)
40
35
30
25
20
15
10
5
0100 1000 10000
1782 G22
VS = 5V, 0V
VCM = 2.5V
AV = 1
AV = 5
AV = 10
FREQUENCY (Hz)
100 1k 10k 100k
OUTPUT SWING (VP-P)
12
10
8
6
4
2
0
1782 G23
DISTORTION ≤ 1%
AV = 1
VS = ±1.5V
VS = ±5V
FREQUENCY (Hz)
0.010
THD + NOISE (%)
0.1
10 1k 10k
1782 G24
0.001
100
1
AV = –1
RF = RG = 100k
AV = 1
VS = 3V, 0V
VOUT = 2VP-P
VCM = 1.2V
RL = 10k
LOAD RESISTANCE TO GROUND (Ω)
0.1
THD + NOISE (%)
1
100 100k
1782 G25
0.01
0.001
1k 10k
10 VS = 3V TOTAL
AV = 1
VIN = 2VP-P AT 1kHz
VS = ±1.5V
VIN = ±1V
VS = 3V, 0V
VIN = 0.5V TO 2.5V
VS = 3V, 0V
VIN = 0.2V TO 2.2V
OUTPUT VOLTAGE AMPLITUDE (VP-P)
0.1
THD + NOISE (%)
1
0123
1782 G26
0.01
0.001
10
AV = –1, RF = RG = 100k
VS = ±1.5V
VCM = 0V
AV = 1
VS = ±1.5V
VCM = 0V
f = 1kHz, RL = 10k
AV = –1, RF = RG = 100k
VS = 3V, 0V
VCM = 1.5V
AV = 1
VS = 3V. 0V
VCM = 1.5V
OUTPUT VOLTAGE (V)
–6 –5 –4 –3 –2 –1 0 1 2 3 456
INPUT OFFSET VOLTAGE CHANGE (50µV/DIV)
1782 G27
RL = 10k
RL = 50k
RL = 2k
VS = ±5V
LT1782
11
1782fb
TYPICAL PERFORMANCE CHARACTERISTICS
Supply Current
vs Shutdown Voltage Large-Signal Response Small-Signal Response
APPLICATIONS INFORMATION
Supply Voltage
The positive supply pin of the LT1782 should be bypassed
with a small capacitor (typically 0.1µF) within an inch of
the pin. When driving heavy loads, an additional 4.7µF
electrolytic capacitor should be used. When using split
supplies, the same is true for the negative supply pin.
The LT1782 is protected against reverse battery voltages
up to 18V. In the event a reverse battery condition occurs,
the supply current is typically less than 1nA.
Inputs
The LT1782 has two input stages, NPN and PNP (see the
Simplifi ed Schematic), resulting in three distinct operating
regions as shown in the Input Bias Current vs Common
Mode typical performance curve.
For input voltages about 0.8V or more below V+, the PNP
input stage is active and the input bias current is typically
–8nA. When the input common mode voltage is within
0.5V of the positive rail, the NPN stage is operating and
the input bias current is typically 15nA. Increases in tem-
perature will cause the voltage at which operation switches
from the PNP input stage to the NPN input stage to move
towards V+. The input offset voltage of the NPN stage is
untrimmed and is typically 1.8mV.
A Schottky diode in the collector of the input NPN tran-
sistors, along with special geometries for these NPN
transistors, allows the LT1782 to operate with either or
both of its inputs above V+. At about 0.3V above V+, the
NPN input transistor is fully saturated and the input bias
current is typically 4µA at room temperature. The input
offset voltage is typically 1.8mV when operating above
V+. The LT1782 will operate with its inputs 18V above
V– regardless of V+.
The inputs are protected against excursions as much as
10V below V– by an internal 6k resistor in series with each
input and a diode from the input to the negative supply.
The input stage of the LT1782 incorporates phase reversal
protection to prevent the output from phase reversing for
inputs up to 9V below V–. There are no clamping diodes
between the inputs and the maximum differential input
voltage is 18V.
Output
The output of the LT1782 can swing to within 60mV of the
positive rail with no load and within 3mV of the negative
rail with no load. When monitoring voltages within 60mV
of the positive rail or within 3mV of the negative rail, gain
should be taken to keep the output from clipping. The
LT1782 can sink and source over 30mA at ±5V supplies,
SHUTDOWN PIN VOLTAGE (V)
0 0.5 1 1.5 2 2.5
SUPPLY CURRENT (µA)
1782 G28
50
40
30
20
10
0
TA = 25°C
TA = –55°C
TA = 125°C VS = 5V, 0V
VS = ±5V
AV = 1
CL = 15pF
1782 G29 VS = ±5V
AV = 1
CL = 15pF
1782 G30
LT1782
12
1782fb
APPLICATIONS INFORMATION
sourcing current is reduced to 10mA at 3V total supplies
as noted in the Electrical Characteristics section.
The LT1782 is internally compensated to drive at least
600pF of capacitance under any output loading condi-
tions. A 0.22µF capacitor in series with a 150Ω resistor
between the output and ground will compensate these
amplifi ers for larger capacitive loads, up to 10,000pF, at
all output currents.
Distortion
There are two main contributors to distortion in op amps:
output crossover distortion as the output transitions from
sourcing to sinking current, and distortion caused by non-
linear common mode rejection. If the op amp is operating
inverting, there is no common mode induced distortion.
If the op amp is operating in the PNP input stage (input is
not within 0.8V of V+), the CMRR is very good, typically
100dB. When the LT1782 switches between input stages,
there is signifi cant nonlinearity in the CMRR. Lower load
resistance increases the output crossover distortion but
has no effect on the input stage transition distortion. For
lowest distortion, the LT1782 should be operated single
supply, with the output always sourcing current and with
the input voltage swing between ground and (V+ – 0.8V).
See the Typical Performance Characteristics curves,
“Total Harmonic Distortion + Noise vs Ouput Voltage
Amplitude.”
Gain
The open-loop gain is almost independent of load when
the output is sourcing current. This optimizes performance
in single supply applications where the load is returned to
ground. The typical performance curve of open-loop gain
for various loads shows the details.
Shutdown
The 6-lead part includes a shutdown feature that disables
the part, reducing quiescent current and making the output
high impedance. The part can be shut down by bringing
the SHDN pin 1.2V or more above V–. When shut down,
the supply current is about 5mA and the output leakage
current is less than 1µA (V– ≤ VOUT ≤ V+). In normal opera-
tion, the SHDN pin can be tied to V– or left fl oating. See
the Typical Performance Characteristics curves, “Supply
Current vs Shutdown Pin Voltage.”
SIMPLIFIED SCHEMATIC
Q10
D5
Q9
Q1
Q7
R2
6k
R3
6k
R4
40k
Q8
Q5
–IN
+IN
Q11 Q12
D4
Q2
D1
Q6
Q13 Q14
R1
30k
R5
40k
Q4
Q15
Q19
D3
Q3
Q16 Q18
Q22
V+
Q17 Q20
Q21
OUT
SHDN
V–
1782 SS
2µA
+
Q23 Q24Q25
Q26
J1
LT1782
13
1782fb
TYPICAL APPLICATIONS
Protected Fault Conditions
Compact, High Output Current, Low Dropout, Precision 2.5V Supply
1782 TA02
–18V
24V
V+
LT1782
5VOK! OK!
+
18V
5V
10V
5VOK! OK!
+
+
REVERSE BATTERY INPUT OVERVOLTAGE
INPUT DIFFERENTIAL VOLTAGE INPUT BELOW GROUND
LT1782
LT1782 LT1782
–
+
LT1782
VS
2.8V to 3.3V
SUPPLY CURRENT 120µA, NO LOAD
ILOAD = 0mA TO 300mA
NOTE: NOT CURRENT LIMITED
0.1µF
1µF 1782 TA03
1k
5%
22
5%
680
5%
100k
5%
VISHAY
SILICONIX
Si3445DV
VOUT
2.5V
LT1790-2.5
LT1782
14
1782fb
PACKAGE DESCRIPTION
S5 Package
5-Lead Plastic TSOT-23
(Reference LTC DWG # 05-08-1635)
1.50 – 1.75
(NOTE 4)
2.80 BSC
0.30 – 0.45 TYP
5 PLCS (NOTE 3)
DATUM ‘A’
0.09 – 0.20
(NOTE 3) S5 TSOT-23 0302 REV B
PIN ONE
2.90 BSC
(NOTE 4)
0.95 BSC
1.90 BSC
0.80 – 0.90
1.00 MAX
0.01 – 0.10
0.20 BSC
0.30 – 0.50 REF
NOTE:
1. DIMENSIONS ARE IN MILLIMETERS
2. DRAWING NOT TO SCALE
3. DIMENSIONS ARE INCLUSIVE OF PLATING
4. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR
5. MOLD FLASH SHALL NOT EXCEED 0.254mm
6. JEDEC PACKAGE REFERENCE IS MO-193
3.85 MAX
0.62
MAX
0.95
REF
RECOMMENDED SOLDER PAD LAYOUT
PER IPC CALCULATOR
1.4 MIN
2.62 REF
1.22 REF
LT1782
15
1782fb
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
PACKAGE DESCRIPTION
S6 Package
6-Lead Plastic TSOT-23
(Reference LTC DWG # 05-08-1636)
1.50 – 1.75
(NOTE 4)
2.80 BSC
0.30 – 0.45
6 PLCS (NOTE 3)
DATUM ‘A’
0.09 – 0.20
(NOTE 3) S6 TSOT-23 0302 REV B
2.90 BSC
(NOTE 4)
0.95 BSC
1.90 BSC
0.80 – 0.90
1.00 MAX 0.01 – 0.10
0.20 BSC
0.30 – 0.50 REF
PIN ONE ID
NOTE:
1. DIMENSIONS ARE IN MILLIMETERS
2. DRAWING NOT TO SCALE
3. DIMENSIONS ARE INCLUSIVE OF PLATING
4. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR
5. MOLD FLASH SHALL NOT EXCEED 0.254mm
6. JEDEC PACKAGE REFERENCE IS MO-193
3.85 MAX
0.62
MAX
0.95
REF
RECOMMENDED SOLDER PAD LAYOUT
PER IPC CALCULATOR
1.4 MIN
2.62 REF
1.22 REF
LT1782
16
1782fb
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com
© LINEAR TECHNOLOGY CORPORATION 1999
LT 0809 REV B • PRINTED IN USA
RELATED PARTS
TYPICAL APPLICATIONS
Current Source
Programmable Gain, AV = 2, AV = 20, 100kHz Amplifi er Programmable Gain Amplifi er Frequency Response
PART NUMBER DESCRIPTION COMMENTS
LT1783 Micropower Over-The-Top SOT-23 Rail-to-Rail Input and
Output Op Amp
SOT-23 Package, Micropower 210µA per Amplifi er, Rail-to-Rail Input and
Output, 1.25MHz GBW
LT1490/LT1491 Dual/Quad Over-The-Top Micropower Rail-to-Rail Input
and Output Op Amps
Single Supply Input Range: –0.4V to 44V, Micropower 50µA per Amplifi er,
Rail-to-Rail Input and Output , 200kHz GBW
LT1636 Single Over-The-Top Micropower Rail-to-Rail Input
and Output Op Amp
55µA Supply Current, VCM Extends 44V Above VEE, Independent of VCC,
MSOP Package, Shutdown Function
LT1638/LT1639 Dual/Quad, 1.2MHz, 0.4V/µs, Over-The-Top Micropower
Rail-to-Rail Input and Output Op Amps
170mA Supply Current, Single Supply Input Range: –0.4V to 44V,
Rail-to-Rail Input and Output
–
+
LT1782
R1
LT1634-1.25
1782 TA04
VCC
IOUT =
2N3906
1.25V
R1
–
+
LT1782
VCC
SHDN
IN
OUT
1782 TA05
VEE
R2
9.09k
R1
10k
R3
1k
–
+
LT1784
VCC
VCC
AV = 2AV = 20
SHDN
VEE
()
AV = 1+ R1 + R2
R3
()
OR 1+ R1
R2 + R3
FREQUENCY (Hz)
GAIN (dB)
30
25
20
15
10
5
0
–5
–10
–15
–201k 100k 1M 10M
1782 TA06
10k
AV = 20
AV = 2
