LT2940 Datasheet PDF - Linear Technology

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LT2940
Linear Technology

Part Number LT2940
Description Power and Current Monitor
Page 24 Pages


LT2940 datasheet pdf
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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
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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/
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LT2940
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. All specifications apply at 6V ≤ VCC ≤ 80V, unless otherwise specified.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Supply
VCC Supply Voltage Operating Range
ICC Supply Current
l6
IPMON = +200μA, IIMON = +200μA l 2
(Note 2)
80
3.5 5
V
mA
VCC(UVLC)
Supply Undervoltage Latch Clear
ΔVCC(HYST) Supply Undervoltage Hysteresis
Voltage Sense
VCC Falling
VCC Rising
l 2.3
l 20
2.5 2.7
75 100
V
mV
VVSEN(OR)
VV
Voltage Sense Pin Operating Range
VCC ≤ 12V
V+ Pin and VPin
12V < VCC < 30V
VCC ≥ 30V
Voltage Sense Differential Input Voltage Range VCC < 11V
(Note 5)
l –0.1
l –0.1
l –0.1
l ±(VCC – 3)
VCC – 3
9
18
V
V
V
V
VV(CL)
VV = VV+ – VV
Voltage Sense Differential Clipping Limit
(Note 5)
VCC ≥ 11V
VCC ≥ 12V
l ±8
l ±9
V
V
IVSEN
Voltage Sense Input Bias Current
V+ Pin and VPin
l –300 –100 100
nA
ΔIVSEN
Voltage Sense Input Offset Current
ΔIVSEN = IV+ – IV
Current Sense
VV+ = VV
l
±50 ±150
nA
VISEN(OR)
Current Sense Pin Operating Range
I+ Pin and IPin
l4
80 V
VI Current Sense Differential Input Voltage
Range (Note 6)
VI = VI+ – VI
VI(CL)
Current Sense Differential Clipping Limit
www.DataSheet4U.(cNoomte 6)
IISEN
Current Sense Input Bias Current
I+ Pin and IPin
l ±200
l ±225
l 75
100 125
mV
mV
μA
ΔIISEN
Current Sense Input Offset Current
ΔIISEN = II+ – II
Power Monitor (Note 2)
VI+ = VI
l
±200 ±800
nA
IPMON(OR)
Power Monitor Output Current Operating
Range
l ±200
μA
IPMON(CAPA) Power Monitor Output Current Capability
VCC ≥ 12V, VPMON ≥ 0V, and
VV = –9V, VI = –225mV, or
VV = 9V, VI = 225mV
VCC ≥ 12V, VPMON ≥ 0.5V, and
VV = –9V, VI = 225mV, or
VV = 9V, VI = –225mV
VCC ≥ 12V, VPMON ≥ 4V, and
VV = –9V, VI = 225mV, or
VV = 9V, VI = –225mV
l 900
l –240
l –800
1200
–1200
–1200
μA
μA
μA
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LT2940
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. All specifications apply at 6V ≤ VCC ≤ 80V, unless otherwise specified.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
VPMON
EPMON
KPMON
VV(OSP)
Power Monitor Output Compliance Voltage
Power Monitor Output Total Error (Note 4)
Power Monitor Scaling Coefficient
IPMON = KPMON • VV • VI
Power Monitor Voltage Sense Input-Referred
Offset Voltage
VCC ≤ 12V, IPMON ≥ 0μA
12V < VCC < 30V, IPMON ≥ 0μA
VCC ≥ 30V, IPMON ≥ 0μA
VCC ≤ 12V, IPMON < 0μA
12V < VCC < 30V, IPMON < 0μA
VCC ≥ 30V, IPMON < 0μA
|VV • VI| ≤ 0.4V2
|VV • VI| ≤ 0.4V2, 25°C < TA ≤ 85°C
|VV • VI| ≤ 0.4V2, LT2940C
|VV • VI| ≤ 0.4V2, LT2940I
Quadrants I and III of Shaded Region
in Figure 4
|VV • VI| = 0.4V2
VV = 0V
l
l
l
l
l
l
l
l
l
l
l
0
0
0
0.5
0.5
0.5
485
VCC – 4.5
7.5
12
VCC – 4.5
7.5
12
±2 ±5
±2.5 ±7
±2.5 ±9
±3.5 ±12
±5 ±15
V
V
V
V
V
V
%FS
%FS
%FS
%FS
%FS
500 515 μA /V2
±40 ±100
mV
VI(OSP)
Power Monitor Current Sense Input-Referred VI = 0mV
Offset Voltage
l
±2 ±6
mV
IPMON(OS)
Power Monitor Output Offset Current
BWPMON
Power Monitor Output Bandwidth
Current Monitor (Note 2)
VV= 0V, VI = 0mV
RPMON = 2k
l
±6 ±15
μA
0.5 MHz
IIMON(FS)
Current Monitor Output Current Operating
Range
l ±200
μA
VIMON
Current Monitor Output Compliance Voltage VCC ≤ 12V, IIMON ≥ 0μA
www.DataSheet4U.com
12V < VCC < 30V, IIMON ≥ 0μA
VCC ≥ 30V, IIMON ≥ 0μA
VCC ≤ 12V, IIMON < 0μA
12V < VCC < 30V, IPMON < 0μA
VCC ≥ 30V, IPMON < 0μA
EIMON
Current Monitor Output Total Error (Note 4) |VI| ≤ 200mV, 25°C ≤ TA ≤ 85°C
|VI| ≤ 200mV, LT2940C
|VI| ≤ 200mV, LT2940I
200mV < |VI| ≤ 225mV
GIMON
Current Monitor Scaling, IIMON = GIMON • VI VI = ±200mV
VI(OSI)
Current Monitor Current Sense Input-Referred
Offset Voltage
l0
l0
VCC – 4.5
7.5
V
V
l0
12 V
l 0.5
l 0.5
VCC – 4.5
7.5
V
V
l 0.5
12 V
±1.5 ±3
%FS
l
±2 ±3.5
%FS
l
±2 ±4
%FS
l
±2.5 ±5
%FS
l 975 1000 1025 μA /V
l
±2.5 ±7
mV
BWIMON
Comparator
VCMP(TH)
ΔVCMP(HYST)
ICMP(BIAS)
ICMPOUT(OL)
Current Monitor Output Bandwidth
Comparator Threshold Voltage
Comparator Threshold Hysteresis
Comparator Input Bias Current
CMPOUT Output Low Voltage
RIMON = 2k
CMP+ Rising
CMP+ Falling
1V ≤ VCMP+ ≤ 1.5V
CMP+ High, ICMPOUT = 3mA
1
l 1.222 1.240 1.258
l –15
–35 –60
l ±100 ±300
l 0.2 0.4
MHz
V
mV
nA
V
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