LTC6104

1

6104f

TYPICAL APPLICATION

FEATURES

APPLICATIONS

DESCRIPTION

High Voltage, High Side,

Bi-Directional Current

Sense Amplifier

The LTC

directional current sense amplifier. Design flexibility is

provided by the excellent device characteristics: ±450µV

maximum offset and only 520µA of current consumption

(typical at 12V). The LTC6104 operates on supplies from

4V to 60V.

The LTC6104 monitors bi-directional current via the voltage

across an external sense resistor (shunt resistor). This

sense voltage is then translated into a ground referenced

signal. Gain is set with three external resistors and can

be separately configured for both directions. Low DC

offset allows the use of a small shunt resistor and large

gain-setting resistors. As a result, power loss in the shunt

is minimal.

The wide operating supply range and high accuracy make

the LTC6104 ideal for a wide variety of automotive, industrial

and power management applications. A maximum input

sense voltage of 500mV allows a wide range of currents

to be monitored. The fast response makes the LTC6104

the perfect choice for load current warnings and shutoff

protection control. With very low supply current, the

LTC6104 is suitable for power sensitive applications.

The LTC6104 is available in an 8-lead MSOP package.

Maximum

Direction is Gain Configurable

, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.

All other trademarks are the property of their respective owners.

+

–

8

7

6

4

+INA

OUT

A

LTC6104

12V

TO

µP

6104 TA01a

–INA

–INB

100

Ω

100

Ω

TO

CHARGER/LOAD

+

–

+INB

+IN

5V

–IN

LT

C2

0.1

µF

R1

2.3k

LTC1286

GND

+

CURRENT

MIRROR

+

–

5

B

CS

CLK

2.5k

+

C1

1

µF

1

16-Bit Resolution Bi-Directional Output into LTC1286 ADC

Step Response

TIME (1

µs/DIV)

6V

1V

1.5V

6104 G15

–

S