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LT2940IDD#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24
LT2940
1
2940f
TYPICAL APPLICATION
DESCRIPTION
Power and Current Monitor
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 fl ow.
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,
fi ltering 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
CMP
+
PMON IMON
CMPOUT
CMPOUT
LATCH
V
–
V
+
I
–
I
+
2940 TA01a
V
CC
110k
+
–
10.0k
0A TO 10A
LED ON WHEN
P
LOAD
> 60W
P
LOAD
= V
LOAD
• I
LOAD
V
LOAD
6V TO 80V
I
LOAD
LT2940
GND
20m
2W
5V
1k
V
IMON
= I
LOAD
• 100
mV
A
V
PMON
= P
LOAD
• 20.75
mV
W
24.9K 4.99k
LOAD
k
V
=
k
I
= 20m
1
12
I
LOAD
(A)
P
LOAD
(W)
0
V
PMON
(V)
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
V
LOAD
=6V
60W ALARM
Monitor Output Level and Load Power
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.
LT2940
2
2940f
ABSOLUTE MAXIMUM RATINGS
V
CC
,
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 V
CC
+ 1V, Up to 16V
CMPOUT, CMPOUT ....................................–0.3V to 36V
CMPOUT, CMPOUT DC Output Current ..................22mA
(Notes 1, 2)
TOP VIEW
DD PACKAGE
12-LEAD (3mm s 3mm) PLASTIC DFN
12
13
11
8
9
10
4
5
3
2
1
V
CC
I
+
I
–
LATCH
V
+
V
–
CMPOUT
CMPOUT
CMP
+
PMON
IMON
GND
6
7
T
JMAX
= 125°C, θ
JA
= 43°C/W
EXPOSED PAD (PIN 13) PCB GND CONNECTION OPTIONAL
1
2
3
4
5
6
CMPOUT
CMPOUT
CMP
+
PMON
IMON
GND
12
11
10
9
8
7
V
CC
I
+
I
–
LATCH
V
+
V
–
TOP VIEW
MS PACKAGE
12-LEAD PLASTIC MSOP
T
JMAX
= 125°C, θ
JA
= 135°C/W
PIN CONFIGURATION
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LT2940CDD#PBF LT2940CDD#TRPBF LDPP 12-Lead Plastic DFN 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 specifi ed with wider operating temperature ranges. *The temperature grade is identifi ed 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 specifi cations, go to:
http://www.linear.com/tapeandreel/
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
LT2940
3
2940f
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Supply
V
CC
Supply Voltage Operating Range
l
680V
I
CC
Supply Current I
PMON
= +200µA, I
IMON
= +200µA
(Note 2)
l
2 3.5 5 mA
V
CC(UVLC)
Supply Undervoltage Latch Clear V
CC
Falling
l
2.3 2.5 2.7 V
∆V
CC(HYST)
Supply Undervoltage Hysteresis V
CC
Rising
l
20 75 100 mV
Voltage Sense
V
VSEN(OR)
Voltage Sense Pin Operating Range V
CC
≤ 12V
l
–0.1 V
CC
– 3 V
12V < V
CC
< 30V
l
–0.1 9 V
V
+
Pin and V
–
Pin V
CC
≥ 30V
l
–0.1 18 V
V
V
Voltage Sense Differential Input Voltage Range
(Note 5)
V
CC
< 11V
l
±(V
CC
– 3) V
V
V
= V
V
+
– V
V
–
V
CC
≥ 11V
l
±8 V
V
V(CL)
Voltage Sense Differential Clipping Limit
(Note 5)
V
CC
≥ 12V
l
±9 V
I
VSEN
Voltage Sense Input Bias Current
V
+
Pin and V
–
Pin
l
–300 –100 100 nA
∆I
VSEN
Voltage Sense Input Offset Current
∆I
VSEN
= I
V
+
– I
V
–
V
V
+
= V
V
–
l
±50 ±150 nA
Current Sense
V
ISEN(OR)
Current Sense Pin Operating Range
I
+
Pin and I
–
Pin
l
480V
V
I
Current Sense Differential Input Voltage
Range (Note 6)
V
I
= V
I
+
– V
I
–
l
±200 mV
V
I(CL)
Current Sense Differential Clipping Limit
(Note 6)
l
±225 mV
I
ISEN
Current Sense Input Bias Current
I
+
Pin and I
–
Pin
l
75 100 125 µA
∆I
ISEN
Current Sense Input Offset Current
∆I
ISEN
= I
I
+
– I
I
–
V
I
+
= V
I
–
l
±200 ±800 nA
Power Monitor (Note 2)
I
PMON(OR)
Power Monitor Output Current Operating
Range
l
±200 µA
I
PMON(CAPA)
Power Monitor Output Current Capability V
CC
≥ 12V, V
PMON
≥ 0V, and
V
V
= –9V, V
I
= –225mV, or
V
V
= 9V, V
I
= 225mV
l
900 1200 µA
V
CC
≥ 12V, V
PMON
≥ 0.5V, and
V
V
= –9V, V
I
= 225mV, or
V
V
= 9V, V
I
= –225mV
l
–240 –1200 µA
V
CC
≥ 12V, V
PMON
≥ 4V, and
V
V
= –9V, V
I
= 225mV, or
V
V
= 9V, V
I
= –225mV
l
–800 –1200 µA
The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. All specifi cations apply at 6V ≤ V
CC
≤ 80V, unless otherwise specifi ed.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24

LT2940IDD#PBF

Mfr. #:
Buy LT2940IDD#PBF
Manufacturer:
Analog Devices Inc.
Description:
Current & Power Monitors & Regulators Power & Current Monitor
Lifecycle:
New from this manufacturer.
Delivery:
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