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Datasheet Linear Technology LT2940IMS#PBF

Manufacturer:Linear Technology
Series:LT2940
Part Number:LT2940IMS#PBF

Power and Current Monitor

Datasheets

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    LT2940 Power and Current Monitor FEATURES n DESCRIPTION
    The LT2940 measures a high side current and a differential 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 noninverting open-collector outputs makes the LT2940 a complete power level monitor. In addition, an output current proportional to the sensed high side current allows current monitoring. The current mode outputs make scaling, filtering and time integration as simple as selecting external resistors and/or capacitors.
    L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Four-Quadrant Power Measurement 5% Power Measurement Accuracy 4V to 80V High Side Sense, 100V Max Current Mode Power and Current Outputs Output Bandwidth Exceeds 500kHz 3% Current Measurement Accuracy 6V to 80V Supply Range, 100V Max Inverting and Noninverting Open-Collector Comparator Outputs Available in 12-Pin DFN (3mm 3mm) and 12-Lead MSOP Packages APPLICATIONS Board Level Power and Current Monitoring Line Card and Server Power Monitoring Power Sense Circuit Breaker Power Control Loops Power/Energy Meters Battery Charger Metering TYPICAL APPLICATION
    Load Monitor Alarms Above 60W
    ILOAD 6V TO 80V 20m 2W 5V VCC 1k LATCH CMPOUT LED ON WHEN PLOAD > 60W CMPOUT CMP+ PMON VPMON = PLOAD 20.75 mV W 24.9K kV = 1 12 kI = 20m PLOAD = VLOAD ILOAD
    2940 TA01a Monitor Output Level and Load Power
    2.5 + VLOAD VPMON (V) 80V 30V 2.0 15V 10V 1.5 VLOAD = 6V 72 PLOAD (W) 96 120 0A TO 10A LOAD I 110k I+ LED ON LT2940 V+ 10.0k V 1.0 LED OFF 48 60W ALARM 0.5 24 GND IMON VIMON = ILOAD 100 4.99k mV A 0 0 2 4 6 8 ILOAD (A) 10 12 14
    2940 TA01b 0 2940f 1 LT2940 ABSOLUTE MAXIMUM RATINGS
    (Notes 1, 2) VCC , I+, I , LATCH . 0.3V to 100V V+, V , CMP+ . 0.3V to 36V Voltage Sense (V+ V ) .36V Current Sense (I+ I ) .36V PMON, IMON (Note 3) . 0.3V to VCC + 1V, Up to 16V CMPOUT, CMPOUT . 0.3V to 36V CMPOUT, CMPOUT DC Output Current .22mA Operating Temperature Range LT2940C. 0C to 70C LT2940I .40C to 85C Storage Temperature Range.65C to 150C Lead Temperature (Soldering, 10 sec) MSOP Package . 300C PIN CONFIGURATION
    TOP VIEW CMPOUT CMPOUT CMP+ PMON IMON GND TOP VIEW 1 2 3 4 5 6 13 12 VCC 11 I+ 10 I 9 LATCH 8 V+ 7 V CMPO ...

Other Names: LT2940IMSPBF, LT2940IMS PBF

Docket:
LT2940 Power and Current Monitor FEATURES n DESCRIPTION
The LT2940 measures a high side current and a differential 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 noninverting open-collector outputs makes the LT2940 a complete power level monitor. In addition, an output current proportional to the sensed high side current allows current monitoring. The current mode outputs make scaling, filtering and time integration as simple as selecting external resistors and/or capacitors.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Four-Quadrant Power Measurement 5% Power Measurement Accuracy 4V to 80V High Side Sense, 100V Ma...

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