1

LT1787/LT1787HV

1787fc

Precision, High Side

Current Sense Amplifiers

µA

°C to 125°C Operating Temperature Range

The LT

side current sense amplifier. The LT1787 monitors bidi-

rectional currents via the voltage across an external sense

resistor. A current or voltage output indicates the direction

and magnitude of the sense current. The LT1787 delivers

greater than a 12-bit dynamic range with ultralow 40

µV

input offset voltage compared to a typical 250mV full-

scale input voltage. A fixed gain of 8 is set by onboard

precision resistors. Input signal filtering is easily imple-

The LT1787HV operates from 2.5V to 60V total supply

voltage and the LT1787 operates from 2.5V to 36V total

supply voltage. Both versions have a PSRR in excess of

120dB. The LT1787/LT1787HV draw only 60

µA and are

available in 8-lead SO and MSOP packages.

■

Cellular Phones

Input Offset Voltage vs Supply Voltage

12-Bit Dynamic Resolution Unidirectional Output into LTC

TOTAL SUPPLY VOLTAGE (V)

0

10

20

30

40

1787 TA01b

50

50

40

30

20

10

0

–10

–20

–30

–40

–50

60

18

27

36

45

LT1787HV

0.0016

Ω

1787 TA01

C1

1

µF

5V

R1

15k

C2

0.1

µF

I = 100A

2.5V TO 60V

TO

LOAD

LT1634-1.25

TO

µP

GND

LTC1286

CS

CLK

+IN

–IN

20k

–

+

DNC

APPLICATIO S

FEATURES

TYPICAL APPLICATIO

DESCRIPTIO

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

All other trademarks are the property of their respective owners.