LT2940 Datasheet PDF - Linear Technology

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LT2940
Linear Technology

Part Number LT2940
Description Power and Current Monitor
Page 24 Pages


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LT2940
Power and Current Monitor
FEATURES
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
APPLICATIONS
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
DESCRIPTION
The LT®2940 measures a high side current and a differ-
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.
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.
TYPICAL APPLICATION
www.DataSheet4U.com Load Monitor Alarms Above 60W
6V TO 80V
5V
1k
LED ON WHEN
PLOAD > 60W
VPMON
=
PLOAD
20.75
mV
W
kV =
1
12
kI = 20mΩ
ILOAD 0A TO 10A
VCC
LATCH
20mΩ
2W
I+ I
LOAD
+
VLOAD
110k
CMPOUT
CMPOUT
CMP+
PMON
LT2940
GND
24.9K
V+
10.0k
V
IMON
VIMON
=
ILOAD
100
mV
A
4.99k
PLOAD = VLOAD • ILOAD
2940 TA01a
Monitor Output Level and Load Power
2.5
80V
30V
2.0
1.5
120
15V 96
10V VLOAD = 6V
LED ON
72
1.0 LED OFF 48
60W ALARM
0.5 24
00
0 2 4 6 8 10 12 14
ILOAD (A)
2940 TA01b
2940f
1

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LT2940 Power and Current Monitor LT2940
Linear Technology
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