LT6105

1

6105fa

TYPICAL APPLICATION

FEATURES

APPLICATIONS

DESCRIPTION

Precision, Extended Input

Range Current Sense Amplifier

amplifier with a very wide input common mode range.

The LT6105 monitors unidirectional current via the volt-

age across an external sense resistor. The input common

mode range extends from –0.3V to 44V, with respect to

to operate as a high side current sense monitor or a low

side current sense monitor. It also allows the LT6105 to

monitor current on a negative supply voltage, as well as

continuously monitor a battery from full charge to depletion.

The inputs of LT6105 can withstand differential voltages

up to ±44V, which makes it ideal for monitoring a fuse or

MOSFET switch.

Gain is configured with external resistors from 1V/V to

100V/V. The input common mode rejection and power

supply rejection are in excess of 100dB and the input offset

voltage is less than 300μV. A typical slew rate of 2V/μs

ensures fast response to unexpected current changes.

The LT6105 can operate from an independent power

supply of 2.85V to 36V and draws only 150μA. When

prevents loading of the monitored circuit, irrespective of

the sense voltage. The LT6105 is available in a 6-lead DFN

and 8-lead MSOP package.

Gain Error vs Input Voltage

× 3mm DFN and 8-Lead MSOP

Packages

Voltages

Gain of 50 Current Sense Amplifier

–

+

0.02Ω

100Ω

100Ω

4.99k

LT6105

2.85V TO 36V

TO LOAD

SOURCE

–0.3V TO 44V

+

–

–IN

+IN

6105 TA01

VV

V

R

R

A

R

R

RR

OUT

S

S

OUT

IN

V

OUT

IN

IN

IN

=−

()

==

;

, LT, LTC, LTM and Over-the-Top are registered trademarks of Linear Technology

Corporation. All other trademarks are the property of their respective owners.

0

2

3

35

1

0

10

20

5

15

25

40

30

45

–3

–4

–1

4

–2

6105 TA01b