LT1787 データシートの表示（PDF） - Linear Technology

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LT1787

Precision, High Side Current Sense Amplifiers

Linear Technology 

LT1787/LT1787HV

Precision, High Side

Current Sense Amplifiers

FEATURES

■ Input Offset Voltage: 75µV (Max)

■ 60V Supply Operation (LT1787HV)

■ 12-Bit Dynamic Range

■ Operating Current: 60µA

■ User-Selectable External Sense Resistor

■ Bidirectional High Side Current Sensing

■ Unidirectional or Bidirectional Output

■ Input Noise Filtering

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

■ Available in 8-Lead SO and MSOP Packages

U

APPLICATIO S

■ Battery Monitoring

■ Power Monitoring

■ Portable Phones

■ Cellular Phones

■ Portable Test/Measurement Systems

■ Battery-Operated Systems

DESCRIPTIO

The LT®1787 is a complete micropower precision high

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 40µV

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-

mented with a capacitor between the FIL– and FIL+ pins.

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 60µA and are

available in 8-lead SO and MSOP packages.

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

All other trademarks are the property of their respective owners.

TYPICAL APPLICATIO

12-Bit Dynamic Resolution Unidirectional Output into LTC®1286 ADC

TO

LOAD

RSENSE

I = 100A 0.0016Ω

1 FIL–

FIL+ 8

2 VS– LT1787HV VS+ 7

3

DNC

4

VEE

VBIAS 6

ROUT

20k 5

VOUT

VOUT = VBIAS + (8 • ILOAD • RSENSE)

C2

0.1µF

2.5V TO 60V

R1

C1

15k

1µF

VREF VCC

+IN

CS

LTC1286 CLK

–IN

GND DOUT

LT1634-1.25

5V

TO µP

1787 TA01

Input Offset Voltage vs Supply Voltage

50

40

30

20

10

0

–10

–20

–30

–40

–50

0

10 20 30 40 50 60

TOTAL SUPPLY VOLTAGE (V)

1787 TA01b

1787fc

1

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