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Linear Technology Electronic Components Datasheet

LT2940 Datasheet

Power and Current Monitor

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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


Linear Technology Electronic Components Datasheet

LT2940 Datasheet

Power and Current Monitor

No Preview Available !

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................................................... 0°C to 70°C
LT2940I................................................–40°C to 85°C
Storage Temperature Range...................–65°C to 150°C
Lead Temperature (Soldering, 10 sec)
MSOP Package ................................................. 300°C
PIN CONFIGURATION
TOP VIEW
CMPOUT 1
12 VCC
CMPOUT 2
11 I+
CMP+ 3 13 10 I
PMON 4
9 LATCH
IMON 5
8 V+
GND 6
7 V
DD PACKAGE
12-LEAD (3mm s 3mm) PLASTIC DFN
TJMAX = 125°C, θJA = 43°C/W
EXPOSED PAD (PIN 13) PCB GND CONNECTION OPTIONAL
CMPOUT 1
CMPOUT 2
CMP+ 3
PMON 4
IMON 5
GND 6
TOP VIEW
12 VCC
11 I+
10 I
9 LATCH
8 V+
7 V
MS PACKAGE
12-LEAD PLASTIC MSOP
TJMAX = 125°C, θJA = 135°C/W
ORDER INFORMATION
wwwL.DEAaDtaSFRheEEetF4IUN.IcSoHm
LT2940CDD#PBF
TAPE AND REEL
LT2940CDD#TRPBF
PART MARKING*
LDPP
PACKAGE DESCRIPTION
12-Lead Plastic DFN
TEMPERATURE RANGE
0°C to 70°C
LT2940IDD#PBF
LT2940IDD#TRPBF
LDPP
12-Lead Plastic DFN
–40°C to 85°C
LT2940CMS#PBF
LT2940CMS#TRPBF
2940
12-Lead Plastic MSOP
0°C to 70°C
LT2940IMS#PBF
LT2940IMS#TRPBF
2940
12-Lead Plastic MSOP
–40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
2940f
2


Part Number LT2940
Description Power and Current Monitor
Maker Linear Technology
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LT2940 Datasheet PDF






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Linear Technology





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