LT2940

1

2940f

TYPICAL APPLICATION

DESCRIPTION

Power and Current Monitor

ential voltage, multiplies them and outputs a current

proportional to instantaneous power. Bidirectional high

side currents and bipolar voltage differences are correctly

handled by the four-quadrant multiplier and push-pull

output stage, which allows the LT2940 to indicate forward

and reverse power flow.

An integrated comparator with inverting and noninvert-

ing open-collector outputs makes the LT2940 a complete

power level monitor. In addition, an output current pro-

portional to the sensed high side current allows current

monitoring. The current mode outputs make scaling,

filtering and time integration as simple as selecting ex-

ternal resistors and/or capacitors.

Load Monitor Alarms Above 60W

FEATURES

APPLICATIONS

n

Four-Quadrant Power Measurement

n

±5% Power Measurement Accuracy

n

4V to 80V High Side Sense, 100V Max

n

Current Mode Power and Current Outputs

n

Output Bandwidth Exceeds 500kHz

n

±3% Current Measurement Accuracy

n

6V to 80V Supply Range, 100V Max

n

Inverting and Noninverting Open-Collector

Comparator Outputs

n

Available in 12-Pin DFN (3mm

× 3mm) and 12-Lead

MSOP Packages

n

Board Level Power and Current Monitoring

n

Line Card and Server Power Monitoring

n

Power Sense Circuit Breaker

n

Power Control Loops

n

Power/Energy Meters

n

Battery Charger Metering

PMON

IMON

CMPOUT

CMPOUT

LATCH

2940 TA01a

110k

+

–

10.0k

0A TO 10A

LED ON WHEN

6V TO 80V

LT2940

GND

20mΩ

2W

5V

1k

mV

A

mV

W

24.9K

4.99k

LOAD

1

12

0

2.0

1.5

1.0

4

8

2

6

10

12

14

0.5

0

2.5

96

72

48

24

0

120

80V

30V

15V

10V

2940 TA01b

LED ON

LED OFF

60W ALARM

Monitor Output Level and Load Power

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