LT6106

1

Rev. C

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TYPICAL APPLICATION

FEATURES

APPLICATIONS

DESCRIPTION

36V Low Cost High Side

Current Sense in a SOT-23

The LT®6106 is a versatile high side current sense ampli-

fier. Design flexibility is provided by the excellent device

characteristics: 250µV maximum offset and 40nA maxi-

mum input bias current. Gain for each device is set by two

resistors and allows for accuracy better than 1%.

The LT6106 monitors current via the voltage across an

external sense resistor (shunt resistor). Internal circuitry

converts input voltage to output current, allowing for a

small sense signal on a high common mode voltage to

be translated into a ground referenced signal. The low DC

offset allows for monitoring very small sense voltages. As

a result, a small valued shunt resistor can be used, which

minimizes the power loss in the shunt.

The wide 2.7V to 44V input voltage range, high accuracy

and wide operating temperature range make the LT6106

ideal for automotive, industrial and power management

applications. The very low power supply current of the

LT6106 also makes it suitable for low power and battery

operated applications.

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Gain Configurable with Two Resistors

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Low Offset Voltage: 250µV Maximum

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Output Current: 1mA Maximum

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Supply Range: 2.7V to 36V, 44V Absolute Maximum

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Low Input Bias Current: 40nA Maximum

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PSRR: 106dB Minimum

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Low Supply Current: 65µA Typical, V+ = 12V

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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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AEC-Q100 Qualified for Automotive Applications

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Current Shunt Measurement

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Battery Monitoring

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Power Management

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Motor Control

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Lamp Monitoring

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Overcurrent and Fault Detection

LT6106

1k

VOUT

200mV/A

6106 TA01a

100

3V TO 36V

LOAD

0.02

V+

V–

OUT

–IN

+IN

3V to 36V, 5A Current Sense with AV = 10

Measurement Accuracy vs Load Current

LOAD CURRENT (A)

0

–1.2

–1.0

–0.6

–0.4

–0.2

2

4

5

0.6

6106 TA01b

–0.8

1

3

0

0.2

0.4

LIMIT OVER TEMPERATURE

LIMIT OVER TEMPERATURE

TYPICAL PART AT TA = 25°C

5A FULL SCALE

RSENSE = 0.02

AV = 10

RIN = 100

ROUT = 1k

V+ = 3V

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