LT1787IMS8#TR Linear Technology, LT1787IMS8#TR Datasheet

IC AMP PREC CURRENT SENSE 8MSOP

LT1787IMS8#TR

Manufacturer Part Number
LT1787IMS8#TR
Description
IC AMP PREC CURRENT SENSE 8MSOP
Manufacturer
Linear Technology
Datasheet

Specifications of LT1787IMS8#TR

Amplifier Type
Current Sense
Number Of Circuits
1
Voltage - Input Offset
40µV
Current - Supply
60µA
Current - Output / Channel
50µA
Voltage - Supply, Single/dual (±)
2.5 V ~ 36 V, ±1.25 V ~ 18 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Output Type
-
-3db Bandwidth
-
Slew Rate
-
Gain Bandwidth Product
-
Current - Input Bias
-

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Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
LT1787IMS8#TRLT1787IMS8
Manufacturer:
LT
Quantity:
10 000
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Part Number:
LT1787IMS8#TRLT1787IMS8
Manufacturer:
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Quantity:
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Part Number:
LT1787IMS8#TRLT1787IMS8#PBF
Manufacturer:
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Quantity:
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Company:
Part Number:
LT1787IMS8#TRPBF
Manufacturer:
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Quantity:
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Company:
Part Number:
LT1787IMS8#TRPBF
Manufacturer:
LINEAR/凌特
Quantity:
20 000
FEATURES
APPLICATIO S
TYPICAL APPLICATIO
LOAD
V
OUT
TO
12-Bit Dynamic Resolution Unidirectional Output into LTC
Input Offset Voltage: 75
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
Battery Monitoring
Power Monitoring
Portable Phones
Cellular Phones
Portable Test/Measurement Systems
Battery-Operated Systems
= V
BIAS
+ (8 • I
1
2
3
4
I = 100A
FIL
V
DNC
V
LOAD
S
EE
LT1787HV
• R
0.0016Ω
R
SENSE
SENSE
U
V
R
20k
V
)
BIAS
FIL
OUT
V
OUT
S
+
+
0.1µF
8
7
6
5
µ
C2
V (Max)
U
2.5V TO 60V
R1
15k
LT1634-1.25
+IN
–IN
V
REF
LTC1286
GND
V
CC
1µF
D
C1
CLK
OUT
®
CS
1286 ADC
TO µP
1787 TA01
DESCRIPTIO
The LT
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
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.
All other trademarks are the property of their respective owners.
5V
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
Current Sense Amplifiers
®
1787 is a complete micropower precision high
Precision, High Side
–10
–20
–30
–40
–50
50
40
30
20
10
U
Input Offset Voltage vs Supply Voltage
0
0
LT1787/LT1787HV
10
TOTAL SUPPLY VOLTAGE (V)
20
30
40
and FIL
50
1787 TA01b
+
60
pins.
1787fc
1

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LT1787IMS8#TR Summary of contents

Page 1

... 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. , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. ® 1286 ADC ...

Page 2

LT1787/LT1787HV ABSOLUTE MAXIMUM Differential Sense Voltage ...................................... ±10V Total Supply Voltage (LT1787) ................................ 40V Total Supply Voltage (LT1787HV) ........................... 65V Output Voltage ..................... (V – 0.3V Output Bias Voltage ............. (V – 0.3V) to ...

Page 3

ELECTRICAL CHARACTERISTICS denotes the specifications which apply over the temperature range 0°C ≤ T The ● – Total supply = (V – 2.5V to 36V (LT1787C), 2.5V to 60V (LT1787HVC) unless otherwise specified SYMBOL PARAMETER ...

Page 4

LT1787/LT1787HV ELECTRICAL CHARACTERISTICS denotes the specifications which apply over the temperature range –40°C ≤ T The ● – 25°C. Total supply = (V – 2.5V to 36V (LT1787I), 2.5V to 60V (LT1787HVI) unless otherwise specified. ...

Page 5

ELECTRICAL CHARACTERISTICS denotes the specifications which apply over the temperature range –40°C ≤ T ● The – 25°C. Total supply = (V – 2.5V to 36V (LT1787I), 2.5V to 60V (LT1787HVI) unless otherwise specified. (Note ...

Page 6

LT1787/LT1787HV ELECTRICAL CHARACTERISTICS denotes the specifications which apply over the temperature range –40°C ≤ T The ● – 25°C. Total supply = (V – 2.5V to 36V (LT1787H), 2.5V to 60V (LT1787HVH) unless otherwise specified. ...

Page 7

W U TYPICAL PERFORMANCE CHARACTERISTICS Input Offset Voltage vs Negative Supply Voltage 30 + – 2. 85°C BIAS 25°C A – ...

Page 8

LT1787/LT1787HV W U TYPICAL PERFORMANCE CHARACTERISTICS Step Response 10mV SENSE 10mV 0V 80mV 0pF OUT 1787 G12 Step Response –128mV SENSE 0V – 100mV 0V – 500mV ...

Page 9

PIN FUNCTIONS – + FIL , FIL (Pins 1, 8): Negative and Positive Filter Termi- nals. Differential mode noise can be filtered by connecting – a capacitor across FIL and FIL f = 1/(2πRC 1.25kΩ. ...

Page 10

LT1787/LT1787HV U U APPLICATIONS INFORMATION The LT1787 high side current sense amplifier (Figure 1) provides accurate bidirectional monitoring of current through a user-selected sense resistor. The sense voltage is amplified by a fixed gain of 8 and level shifted from ...

Page 11

U U APPLICATIONS INFORMATION with absolute minimum swing at 30mV above V may swing positive to within 0.75V 35V, a limit set by internal junction breakdown. Within these contraints, an amplified, level shifted representation of the R ...

Page 12

LT1787/LT1787HV U U APPLICATIONS INFORMATION Operation with A/D Converter Figure 6 shows the LT1787 operating with the LTC1286 A/D converter. This low cost circuit is capable of 12-bit resolution of unipolar currents. The – IN pin of the A/D converter ...

Page 13

U U APPLICATIONS INFORMATION 0.30 0.25 0.20 0.15 0.10 0.05 IDEAL 0 0 0.005 0.010 0.015 0.020 + – V – Figure 9. Expanded Scale of Unidirectional Output Adjusting Gain Setting The LT1787 may be used ...

Page 14

LT1787/LT1787HV PACKAGE DESCRIPTION 5.23 (.206) MIN 0.42 ± 0.038 (.0165 ± .0015) TYP RECOMMENDED SOLDER PAD LAYOUT 0.254 (.010) GAUGE PLANE 0.18 (.007) NOTE: 1. DIMENSIONS IN MILLIMETER/(INCH) 2. DRAWING NOT TO SCALE 3. DIMENSION DOES NOT INCLUDE MOLD FLASH, ...

Page 15

... MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm) Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. ...

Page 16

... Dual Precision Instrumentation Switched Capacitor Building Block LT1490/LT1491 Dual and Quad Micropower Rail-to-Rail Input and Output Op Amps LT1620/LT1621 Rail-to-Rail Current Sense Amplifiers Over-The-Top is a trademark of Linear Technology Corporation. Linear Technology Corporation 16 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 ● ...

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