LT2940 Datasheet | Linear Technology

LT2940 Power and Current Monitor Features n n n n n n n n n DESCRIPTION The LT®2940 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 parator with inverting and noninverting open-collector outputs makes the LT2940 a plete 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 500k Hz ±3% Current Measurement Accuracy 6V to 80V Supply Range, 100V Max Inverting and Noninverting Open-Collector parator Outputs Available in 12-Pin DFN (3mm × 3mm) and 12-Lead MSOP Packages APPLICATIONS n n n n n n 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 0A TO 10A + VLOAD - VPMON (V) Monitor Output Level and Load Power 2.5 80V 30V 2.0 15V 10V 1.5 VLOAD = 6V 72 PLOAD (W) 96 120 6V TO 80V 20mΩ 2W 5V VCC 1k LATCH CMPOUT LED ON WHEN PLOAD > 60W CMPOUT CMP+ PMON VPMON = PLOAD - 20.75 m V W 24.9K k V = 1 12 k I = 20mΩ PLOAD = VLOAD - ILOAD GND LT2940 I+ I- LOAD LED ON 110k V+ 10.0k V- IMON VIMON = ILOAD - 100 4.99k m V A LED OFF 48...