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LT1787HVIMS8#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
1
LT1787/LT1787HV
1787fc
Precision, High Side
Current Sense Amplifiers
■
Input Offset Voltage: 75
µ
V (Max)
■
60V Supply Operation (LT1787HV)
■
12-Bit Dynamic Range
■
Operating Current: 60µA
■
User-Selectable External Sense Resistor
■
Bidirectional High Side Current Sensing
■
Unidirectional or Bidirectional Output
■
Input Noise Filtering
■
–40°C to 125°C Operating Temperature Range
■
Available in 8-Lead SO and MSOP Packages
The LT
®
1787 is a complete micropower precision high
side current sense amplifier. The LT1787 monitors bidi-
rectional currents via the voltage across an external sense
resistor. A current or voltage output indicates the direction
and magnitude of the sense current. The LT1787 delivers
greater than a 12-bit dynamic range with ultralow 40µV
input offset voltage compared to a typical 250mV full-
scale input voltage. A fixed gain of 8 is set by onboard
precision resistors. Input signal filtering is easily imple-
mented with a capacitor between the FIL
–
and FIL
+
pins.
The LT1787HV operates from 2.5V to 60V total supply
voltage and the LT1787 operates from 2.5V to 36V total
supply voltage. Both versions have a PSRR in excess of
120dB. The LT1787/LT1787HV draw only 60µA and are
available in 8-lead SO and MSOP packages.
■
Battery Monitoring
■
Power Monitoring
■
Portable Phones
■
Cellular Phones
■
Portable Test/Measurement Systems
■
Battery-Operated Systems
Input Offset Voltage vs Supply Voltage
12-Bit Dynamic Resolution Unidirectional Output into LTC
®
1286 ADC
TOTAL SUPPLY VOLTAGE (V)
0
INPUT OFFSET VOLTAGE (µV)
10
20
30 40
1787 TA01b
50
50
40
30
20
10
0
–10
–20
–30
–40
–50
60
18
27
36
45
LT1787HV
R
SENSE
0.0016Ω
1787 TA01
C1
1µF
5V
FIL
+
FIL
–
R1
15k
C2
0.1µF
V
OUT
= V
BIAS
+ (8 • I
LOAD
• R
SENSE
)
I = 100A
2.5V TO 60V
TO
LOAD
LT1634-1.25
TO µP
V
REF
V
CC
GND
LTC1286
CS
CLK
D
OUT
+IN
–IN
V
BIAS
V
OUT
R
OUT
20k
V
S
–
V
S
+
DNC
V
EE
APPLICATIO S
U
FEATURES
TYPICAL APPLICATIO
U
DESCRIPTIO
U
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
2
LT1787/LT1787HV
1787fc
ABSOLUTE MAXIMUM RATINGS
W
WW
U
Differential Sense Voltage ...................................... ±10V
Total Supply Voltage (LT1787) ................................ 40V
Total Supply Voltage (LT1787HV) ........................... 65V
Output Voltage ..................... (V
EE
– 0.3V) to (V
EE
+ 35V)
Output Bias Voltage ............. (V
EE
– 0.3V) to (V
EE
+ 35V)
Operating Temperature Range (Note 3)
LT1787C ............................................. –40°C to 85°C
LT1787I .............................................. –40°C to 85°C
LT1787H .......................................... –40°C to 125°C
(Notes 1, 2)
PACKAGE/ORDER INFORMATION
W
U
U
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
S
–
, V
S
+
Sense Amplifier Supply Voltage Single Supply Operation (LT1787) ● 2.5 36 V
Single Supply Operation (LT1787HV)
● 2.5 60 V
V
SENSE
Input Sense Voltage Full Scale V
SENSE
= V
S
+
– V
S
–
, V
S
= 10V, V
BIAS
= 5V, A
V
= 8 ±10% ● 500 mV
V
OS
Input Offset Voltage (S8) I
OUT
= 0, V
S
Supply = 5V – 75 ±40 75 µV
0°C ≤ T
A
≤ 70°C ● –135 135 µV
I
OUT
= 0 (LT1787) –100 100 µV
0°C ≤ T
A
≤ 70°C ● –160 160 µV
I
OUT
= 0 (LT1787HV) –100 100 µV
0°C ≤ T
A
≤ 70°C ● –160 160 µV
The ● denotes the specifications which apply over the temperature range 0°C ≤ T
A
≤ 70°C, otherwise specifications are at T
A
= 25°C.
Total supply = (V
S
–
– V
EE
) = 2.5V to 36V (LT1787C), 2.5V to 60V (LT1787HVC) unless otherwise specified.
Specified Temperature Range (Note 4)
LT1787C ............................................. –40°C to 85°C
LT1787I .............................................. –40°C to 85°C
LT1787H .......................................... –40°C to 125°C
Storage Temperature Range ..................–65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
(Note 5)
TOP VIEW
FIL
+
V
S
+
V
BIAS
V
OUT
FIL
–
V
S
–
DNC*
V
EE
S8 PACKAGE
8-LEAD PLASTIC SO
1
2
3
4
8
7
6
5
* DO NOT CONNECT
T
JMAX
= 150°C, θ
JA
= 190°C/ W
1
2
3
4
8
7
6
5
TOP VIEW
MS8 PACKAGE
8-LEAD PLASTIC MSOP
FIL
+
V
S
+
V
BIAS
V
OUT
FIL
–
V
S
–
DNC*
V
EE
* DO NOT CONNECT
T
JMAX
= 150°C, θ
JA
= 250°C/ W
MS8 PART MARKING
Consult LTC Marketing for parts specified with wider operating temperature ranges.
LTGM
LTGN
LTKJ
LTKK
Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: http://www.linear.com/leadfree/
ORDER PART NUMBER
LT1787CMS8
LT1787IMS8
LT1787HVCMS8
LT1787HVIMS8
S8 PART MARKING
1787
1787I
1787H
1787HV
787HVI
787HVH
ORDER PART NUMBER
LT1787CS8
LT1787IS8
LT1787HS8
LT1787HVCS8
LT1787HVIS8
LT1787HVHS8
3
LT1787/LT1787HV
1787fc
Input Offset Voltage (MS8) I
OUT
= 0, V
S
Supply = 5V –125 ±40 125 µV
0°C ≤ T
A
≤ 70°C ● –230 230 µV
I
OUT
= 0 (LT1787) –150 150 µV
0°C ≤ T
A
≤ 70°C ● –250 250 µV
I
OUT
= 0 (LT1787HV) –150 150 µV
0°C ≤ T
A
≤ 70°C ● –250 250 µV
V
OS
TC Temperature Coefficient of V
OS
V
S
Supply = 5V (Note 6) ● 0.5 2 µV/°C
I
OUT(O)
No-Load Output Current Error V
SENSE
= 0V 4 nA
V
OUT(O)
No-Load Output Voltage Error V
SENSE
= 0V, V
S
Supply = 5V –600 600 µV
(S8) 0°C ≤ T
A
≤ 70°C ● –1080 1080 µV
No-Load Output Voltage Error V
SENSE
= 0V, V
S
Supply = 5V –1000 1000 µV
(MS8) 0°C ≤ T
A
≤ 70°C ● –1840 1840 µV
g
m
Tranconductance, I
OUT
/V
SENSE
±V
SENSE
= 10mV, 50mV, 100mV, 150mV, 250mV, 400 µA/V
V
S
Supply = Total Supply + |V
SENSE
|
A
V
Gain, V
OUT
/V
SENSE
±V
SENSE
= 100mV, V
S
Supply = 5V ● 7.76 8 8.24 V/V
Output Voltage Gain Error ±V
SENSE
= 100mV, V
S
Supply = 5V ● –3 1 3 %
V
S
PSRR V
S
Supply Rejection Ratio V
SENSE
= 0V, V
S
Supply = 2.5V to 36V (LT1787) ● 120 135 dB
V
SENSE
= 0V, V
S
Supply = 2.5V to 60V (LT1787HV) ● 120 135 dB
V
EE
PSRR Negative Supply Rejection Ratio V
SENSE
= 0V, V
S
Supply = 15V, V
BIAS
= 0V, ● 100 130 dB
V
EE
= –1V to –15V (LT1787)
V
SENSE
= 0V, V
S
Supply = 40V, V
BIAS
= 0V, ● 100 130 dB
V
EE
= –1V to – 15V (LT1787HV)
∆V
OS
Change in Input Offset Voltage V
SENSE
= 0V, V
S
Supply = 36V, V
BIAS
= 0.5V to 25V (LT1787) ● 100 130 dB
∆V
BIAS
with Change in V
BIAS
Voltage V
SENSE
= 0V, V
S
Supply = 60V, V
BIAS
= 0.5V to 25V (LT1787HV) ● 100 130 dB
I
S
+
(O)
Positive Input Sense Current V
SENSE
= 0V ● 10 20 µA
I
S
–
(O)
Negative Input Sense Current V
SENSE
= 0V ● 50 100 µA
I
EE(O)
Negative Supply Current V
SENSE
= 0V ● 60 120 µA
I
OUT
Output Current V
SENSE
= ±128mV ±50 µA
V
OUT
Output Voltage V
SENSE
= ±128mV, V
S
+
≥ 3.3V V
BIAS
±1.024 V
Ripple Rejection V
S
+
= V
S
–
= 20V, ∆V
S
Supply = 1V, f = 1kHz ● 80 88 dB
V
OMIN
Minimum Output Voltage V
SENSE
= 0V, V
BIAS
= 0V 30 45 mV
V
SENSE
= V
S
+
– V
S
–
= –128mV, V
BIAS
= 0V 10 mV
V
SENSE
= 0V, V
BIAS
= 0V ● 30 49 mV
V
SENSE
= V
S
+
– V
S
–
= –128mV, V
BIAS
= 0V 10 mV
Unipolar Output V
SENSE
= 2mV, V
BIAS
= 0V 32 50 mV
Saturation Voltage V
SENSE
= 4mV, V
BIAS
= 0V 38 55 mV
V
SENSE
= 5mV, V
BIAS
= 0V 43 60 mV
V
SENSE
= 6mV, V
BIAS
= 0V 49 65 mV
V
SENSE
= 2mV, V
BIAS
= 0V ● 32 54 mV
V
SENSE
= 4mV, V
BIAS
= 0V ● 38 59 mV
V
SENSE
= 5mV, V
BIAS
= 0V ● 43 64 mV
V
SENSE
= 6mV, V
BIAS
= 0V ● 49 69 mV
V
OMAX
Maximum Output Voltage V
S
+
– 0.75 V
R
G1A,
R
G2A
Input Gain-Setting Resistor Pin 1 to Pin 2, Pin 7 to Pin 8 1.25 kΩ
R
OUT
Output Resistor Pin 5 to Pin 6 20 kΩ
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
The ● denotes the specifications which apply over the temperature range 0°C ≤ T
A
≤ 70°C, otherwise specifications are at T
A
= 25°C.
Total supply = (V
S
–
– V
EE
) = 2.5V to 36V (LT1787C), 2.5V to 60V (LT1787HVC) unless otherwise specified.
(Note 5)
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

LT1787HVIMS8#PBF

Mfr. #:
Buy LT1787HVIMS8#PBF
Manufacturer:
Analog Devices Inc.
Description:
Current Sense Amplifiers Prec, Hi Side C Sense Amps
Lifecycle:
New from this manufacturer.
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