LT1782

1

1782fc

TYPICAL APPLICATION

DESCRIPTION

Micropower, Over-The-Top

SOT-23, Rail-to-Rail

Input and Output Op Amp

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

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Rail-to-Rail Input and Output

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Micropower: 55µA Supply Current Max

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Operating Temperature Range: –40°C to 125°C

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Low Profile (1mm) ThinSOT™ Package

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Low Input Offset Voltage: 800µV Max

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Single Supply Input Range: 0V to 18V

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High Output Current: 18mA Min

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Specified on 3V, 5V and ±5V Supplies

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Output Shutdown on 6-Lead Version

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Reverse Battery Protection to 18V

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High Voltage Gain: 1500V/mV

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Gain Bandwidth Product: 200kHz

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Slew Rate: 0.07V/µs

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Portable Instrumentation

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Battery- or Solar-Powered Systems

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Sensor Conditioning

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Supply Current Sensing

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Battery Monitoring

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MUX Amplifiers

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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

0V TO 4.3V

2k

200

1782 TA01a

5V

5V TO 18V

200

0.2

LOAD

MMBT3904

–900 –600 –300

0

300

600

900

INPUT OFFSET VOLTAGE (µV)

1782 TA01b

25

20

15

10

5

0