LT1782CS6#TR - Linear Technology

LT1782

1782fc

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 ampliﬁer

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 Proﬁle (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 Speciﬁed 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 Ampliﬁers

n 4mA to 20mA Transmitters

L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and

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 = 2Ω(ILOAD)

0V TO 4.3V

200Ω

1782 TA01a

V+

5V TO 18V

200Ω

0.2Ω

LOAD

MMBT3904

–900 –600 –300 0 300 600 900

PERCENTAGE OF AMPLIFIERS

INPUT OFFSET VOLTAGE (µV)

1782 TA01b

VS = 5V, 0V

VCM = 2.5V

LT1782

1782fc

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) ........... Indeﬁnite

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)

OUT

V–

+IN

V+

–IN

TOP VIEW

S5 PACKAGE

5-LEAD PLASTIC TSOT-23

+–

TJMAX = 150°C, θJA = 250°C/W

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 speciﬁed with wider operating temperature ranges.

Consult LTC Marketing for information on non-standard lead based ﬁnish parts.

For more information on lead free part marking, go to: http://www.linear.com/leadfree/

For more information on tape and reel speciﬁcations, go to: http://www.linear.com/tapeandreel/

Speciﬁed 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

1782fc

ELECTRICAL CHARACTERISTICS

The l denotes the speciﬁcations which apply over the full operating

temperature range, otherwise speciﬁcations 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 speciﬁed.

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

400

800

950

1100

µV

∆VOS/∆TInput Offset Voltage Drift (Note 7) l 2 5 µV/°C

IOS Input Offset Current

VCM = 18V (Note 5)

0.7 2

µA

IB Input Bias Current

VCM = 18 (Note 5)

SHDN or VS = 0V, VCM = 0V to 18V

0.1

µA

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

3.4

1.5

6.5

MΩ

GΩ

MΩ

CIN Input Capacitance 5 pF

Input Voltage Range l0 18 V

CMRR Common Mode Rejection Ratio

(Note 5)

VCM = 0V to VCC – 1V

VCM = 0V to 18V (Note 8)

100

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

200

133

100

1500 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

400

250

200

500 V/mV

V/mV

VOL Output Voltage Swing LOW No Load

ISINK = 5mA

VS = 5V, ISINK = 10mA

200

400

500

800

VOH Output Voltage Swing HIGH VS = 3V, No Load

VS = 3V, ISOURCE = 5mA

2.91

2.6

2.94

2.8

VS = 5V, No Load

VS = 5V, ISOURCE = 10mA

4.91

4.5

4.94

4.74

ISC Short-Circuit Current (Note 2) VS = 3V, Short to GND

VS = 3V, Short to VCC

VS = 5V, Short to GND

VS = 5V, Short to VCC

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

40 55

µA

Supply Current, SHDN VPIN5 = 2V, No Load (Note 10) l5 15 µA

LT1782

1782fc

ELECTRICAL CHARACTERISTICS

The l denotes the speciﬁcations which apply over the full operating

temperature range, otherwise speciﬁcations 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 speciﬁed.

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)

0.5

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) l2 V

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

110

100

200 kHz

kHz

SR Slew Rate

(Note 5)

AV = –1, RL = ∞

0°C ≤ TA ≤ 70°C

–40°C ≤ TA ≤ 85°C

0.035

0.031

0.028

0.07 V/µs

V/µs

tSSettling Time VS = 5V, ∆VOUT = 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 speciﬁcations which apply over the full operating temperature range, otherwise speciﬁcations are at TA = 25°C.

VS = ±5V, VCM = 0V, VOUT = 0V, for the 6-lead part VPIN5 = V–, pulse power tested unless otherwise speciﬁed.

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

500

900

1050

1200

µV

∆VOS/∆TInput Offset Voltage Drift (Note 7) l 2 5 µV/°C

IOS Input Offset Current l 0.7 2 nA

IB Input Bias Current l 8 15 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

3.4

1.5

6.5

MΩ

CIN Input Capacitance 5 pF

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

150 V/mV

V/mV

LT1782

1782fc

SYMBOL PARAMETER CONDITIONS

LT1782C/LT1782I

UNITSMIN TYP MAX

VOL Output Voltage Swing LOW No Load

ISINK = 5mA

ISINK = 10mA

–4.997

–4.8

–4.6

–4.992

–4.5

–4.2

VOH Output Voltage Swing HIGH No Load

ISINK = 5mA

ISINK = 10mA

4.91

4.6

4.5

4.94

4.8

4.74

ISC Short-Circuit Current (Note 2) Short to GND

0°C ≤ TA ≤ 70°C

30 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

45 60

µA

Supply Current, SHDN VPIN5 = –3V, VS = ±5V, No Load (Note 10) l6 20 µA

ISHDN Shutdown Pin Current VPIN5 = –4.7V, VS = ±5V, No Load (Note 10)

VPIN5 = –3V, VS = ±5V, No Load (Note 10)

0.5

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

120

110

100

225 kHz

kHz

SR Slew Rate AV = –1, RL = ∞, VO = ±4V, Measured at VO = ±2V

0°C ≤ TA ≤ 70°C

–40°C ≤ TA ≤ 85°C

0.0375

0.033

0.030

0.075 V/µs

V/µs

tSSettling Time ∆VOUT = 4V to 0.1%, AV = 1 50 µs

FPBW Full-Power Bandwidth (Note 9) VOUT = 8VP-P 3 kHz

ELECTRICAL CHARACTERISTICS

The l denotes the speciﬁcations which apply over the full operating

temperature range, otherwise speciﬁcations are at TA = 25°C. VS = ±5V, VCM = 0V, VOUT = 0V, for the 6-lead part VPIN5 = V–, pulse

power tested unless otherwise speciﬁed.

The l denotes the speciﬁcations 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 speciﬁed. (Note 4)

SYMBOL PARAMETER CONDITIONS

LT1782H

UNITSMIN TYP MAX

VOS Input Offset Voltage

400 800

µV

∆VOS/∆TInput Offset Voltage Drift l 15 µV/°C

IOS Input Offset Current

VCM = 18V (Note 5)

µA

IB Input Bias Current

VCM = 18V (Note 5)

µA

Input Voltage Range l0.3 18 V

CMRR Common Mode Rejection Ratio VCM = 0.3V to VCC – 1V

VCM = 0.3V to 18V

LT1782

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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

200

1500 V/mV

V/mV

VS = 5V, VO = 500mV to 4.5V, RL = 10k

400

1500 V/mV

V/mV

VOL Output Voltage Swing LOW No Load

ISINK = 5mA

VS = 5V, ISINK = 10mA

900

1500

VOH Output Voltage Swing HIGH VS = 3V, No Load

VS = 3V, ISOURCE = 5mA

2.85

2.20

VS = 5V, No Load

VS = 5V, ISOURCE = 10mA

4.85

3.80

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

40 55

100

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)

0.5

µA

Output Leakage Current VPIN5 = 2V, No Load (Note 10) l3 µA

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) l2 V

GBW Gain Bandwidth Product f = 10kHz (Note 5)

110

200 kHz

kHz

SR Slew Rate AV = –1, RL = ∞ (Note 7)

0.035

0.020

0.07 V/µs

V/µs

ELECTRICAL CHARACTERISTICS

The l denotes the speciﬁcations 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 speciﬁed. (Note 4)

The l denotes the speciﬁcations 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 speciﬁed. (Note 4)

SYMBOL PARAMETER CONDITIONS

LT1782H

UNITSMIN TYP MAX

VOS Input Offset Voltage

500 900

3.2

µV

∆VOS/∆TInput Offset Voltage Drift (Note 9) l 15 µV/°C

IOS Input Offset Current l 3 nA

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

150 V/mV

V/mV

VOOutput Voltage Swing No Load

ISINK = ±5mA

ISINK = ±10mA

±4.85

±4.10

±3.50

LT1782

1782fc

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

45 60

110

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)

0.5

µA

Maximum Shutdown Pin Current VPIN5 = 9V, VS = ±9V, No Load (Note 10) l45 µA

Output Leakage Current VPIN5 = –7V, VS = ±9V, No Load l3 µA

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

120

225 kHz

kHz

SR Slew Rate AV = –1, RL = ∞, VO = ±4V

Measured at VO = ±2V

0.0375

0.0220

0.075 V/µs

V/µs

ELECTRICAL CHARACTERISTICS

The l denotes the speciﬁcations 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 speciﬁed. (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 speciﬁed performance from

0°C to 70°C. The LT1782C is designed, characterized and expected to

meet speciﬁed performance from –40°C to 85°C but is not tested or

QA sampled at these temperatures. The LT1782I is guaranteed to meet

speciﬁed performance from – 40°C to 85°C. The LT1782H is guaranteed to

meet speciﬁed 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 speciﬁcation 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: Speciﬁcations apply to 6-lead SOT-23 with shutdown.

Note 11: Full-power bandwidth is calculated for the slew rate.

FPBW = SR/2�VP.

LT1782

1782fc

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

TA = 125°C

TA = 25°C

TA = –55°C

TOTAL SUPPLY VOLTAGE (V)

012345

INPUT OFFSET VOLTAGE CHANGE (µV)

1782 G02

400

300

200

100

–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

VS = 5V, 0V

–6 –4 0 2–2 4

VIN

–

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

–10

TA = 125°C

VS = 5V, 0V

TA = –55°C

TA = 25°C

1µ

0.01

OUTPUT SATURATION VOLTAGE (V)

0.1

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

TA = 125°C

TA = –55°C

TA = 25°C

VS = ±2.5V

VOD = 30mV

INPUT OVERDRIVE (mV)

OUTPUT SATURATION VOLTAGE (mV)

100

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

VS = ±5V

SINKING CURRENT

SOURCING CURRENT

TIME (sec)

NOISE VOLTAGE (400nV/DIV)

1782 G09

VS = ±2.5V

012345678910

LT1782

1782fc

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)

20 1 100 1k 10k

1782 G10

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

VS = ±2.5V

FREQUENCY (Hz)

GAIN (dB)

–10

–20

–30

PHASE SHIFT (DEG)

100

–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

AV = –1

RF = RG = 10k

f = 5kHz

PHASE MARGIN

GAIN BANDWIDTH PRODUCT

LOAD RESISTANCE (Ω)

GAIN BANDWIDTH PRODUCT (kHz)

250

200

150

100

PHASE MARGIN (DEG)

10k 100k

1782 G16

VS = ±2.5V

AV = –1

RF = RG = 10k

f = 5kHz

PHASE MARGIN

GAIN BANDWIDTH PRODUCT

FREQUENCY (Hz)

POWER SUPPLY REJECTION RATIO (dB)

–10

10k 100k 1M

1782 G17

VS = ±2.5V

POSITIVE SUPPLY

NEGATIVE SUPPLY

FREQUENCY (Hz)

COMMON MODE REJECTION RATIO (dB)

110

100

30 10k 100k

1782 G18

VS = ±2.5V

LT1782

1782fc

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)

10k

10k1k 100k 1M

1782 G19

100

1k AV = 100

VS = ±2.5V

AV = 10

AV = 1

FREQUENCY (Hz)

100

OUTPUT IMPEDANCE (Ω)

10k

1k 10k 100k 1M

1782 G20

100k

VS = ±2.5V

VPIN5 (SHUTDOWN) = 2.5V

SETTLING TIME (µs)

25 30 35 40 50 60 70 80

OUTPUT STEP (V)

1782 G21

–1

–2

–3

–4

AV = 1 AV = –1

VS = ±5V

CAPACITIVE LOAD (pF)

OVERSHOOT (%)

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)

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

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 (%)

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 (%)

0123

1782 G26

0.01

0.001

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 4 5 6

INPUT OFFSET VOLTAGE CHANGE (50µV/DIV)

1782 G27

RL = 10k

RL = 50k

RL = 2k

VS = ±5V

LT1782

1782fc

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

Simpliﬁed 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

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

1782fc

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

ampliﬁers 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 signiﬁcant 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 5µA 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 ﬂoating. See

the Typical Performance Characteristics curves, “Supply

Current vs Shutdown Pin Voltage.”

SIMPLIFIED SCHEMATIC

Q10

40k

–IN

+IN

Q11 Q12

Q13 Q14

30k

40k

Q15

Q19

Q16 Q18

Q22

V+

Q17 Q20

Q21

OUT

SHDN

V–

1782 SS

2µA

Q23 Q24Q25

Q26

LT1782

1782fc

TYPICAL APPLICATIONS

Protected Fault Conditions

Compact, High Output Current, Low Dropout, Precision 2.5V Supply

1782 TA02

–18V

24V

V+

LT1782

5VOK! OK!

18V

10V

5VOK! OK!

REVERSE BATTERY INPUT OVERVOLTAGE

INPUT DIFFERENTIAL VOLTAGE INPUT BELOW GROUND

LT1782

LT1782 LT1782

–

LT1782

2.8V to 3.3V

SUPPLY CURRENT ≅ 120µA, NO LOAD

ILOAD = 0mA TO 300mA

NOTE: NOT CURRENT LIMITED

0.1µF

1µF 1782 TA03

22Ω

680Ω

100k

VISHAY

SILICONIX

Si3445DV

VOUT

2.5V

LT1790-2.5

LT1782

1782fc

S6 Package

6-Lead Plastic TSOT-23

(Reference LTC DWG # 05-08-1636)

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

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

1782fc

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.

REVISION HISTORY

REV DATE DESCRIPTION PAGE NUMBER

C 10/10 Revised supply current in shutdown mode from 5mA to 5µA in Shutdown section of Applications Information 12

(Revision history begins at Rev C)

LT1782

1782fc

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 1010 REV C • PRINTED IN USA

RELATED PARTS

TYPICAL APPLICATIONS

Current Source

Programmable Gain, AV = 2, AV = 20, 100kHz Ampliﬁer Programmable Gain Ampliﬁer 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 Ampliﬁer, 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 Ampliﬁer,

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

LT1634-1.25

1782 TA04

VCC

IOUT =

2N3906

1.25V

–

LT1782

VCC

SHDN

OUT

1782 TA05

VEE

9.09k

10k

–

LT1784

VCC

AV = 2AV = 20

SHDN

VEE

( )

AV = 1+ R1 + R2

( )

OR 1+ R1

R2 + R3

FREQUENCY (Hz)

GAIN (dB)

–5

–10

–15

–201k 100k 1M 10M

1782 TA06

10k

AV = 20

AV = 2