LT1787HV Linear Technology, LT1787HV Datasheet

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LT1787HV

Manufacturer Part Number
LT1787HV
Description
Precision/ High Side Current Sense Amplifiers
Manufacturer
Linear Technology
Datasheet

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FEATURES
APPLICATIO S
TYPICAL APPLICATIO
LOAD
V
OUT
TO
12-Bit Dynamic Resolution Unidirectional Output into LTC
Input Offset Voltage: 75 V (Max)
60V Supply Operation (LT1787HV)
12-Bit Dynamic Range
Operating Current: 60 A
User-Selectable External Sense Resistor
Bidirectional High Side Current Sensing
Unidirectional or Bidirectional Output
Input Noise Filtering
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
0.0016
R
SENSE
SENSE
U
V
R
20k
V
)
BIAS
FIL
OUT
V
OUT
S
+
+
0.1 F
8
7
6
5
C2
U
2.5V TO 60V
R1
15k
LT1634-1.25
+IN
–IN
V
REF
LTC1286
GND
V
CC
1 F
D
C1
CLK
OUT
®
CS
1286 ADC
TO P
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 depicts the direction
and magnitude of the sense current. The LT1787 delivers
greater than a 12-bit dynamic range with ultralow 40 V
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 60 A and are
available in 8-lead SO and MSOP packages.
5V
, LTC and LT 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.
1

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LT1787HV Summary of contents

Page 1

... 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 60 A and are available in 8-lead SO and MSOP packages. , LTC and LT are registered trademarks of Linear Technology Corporation. ...

Page 2

... C/ W JMAX JA ELECTRICAL CHARACTERISTICS The denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T – Total supply = (V – 2.5V to 36V (LT1787), 2.5V to 60V (LT1787HV) unless otherwise specified SYMBOL PARAMETER – Sense Amplifier Supply Voltage Single Supply Operation (LT1787) ...

Page 3

... ELECTRICAL CHARACTERISTICS The denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T – Total supply = (V – 2.5V to 36V (LT1787), 2.5V to 60V (LT1787HV) unless otherwise specified SYMBOL PARAMETER V TC Temperature Coefficient No-Load Output Current Error ...

Page 4

... LT1787/LT1787HV W U TYPICAL PERFORMANCE CHARACTERISTICS Input Offset Voltage vs Supply Voltage 50 + – BIAS V = –1.25V –10 –20 – – –40 – TOTAL SUPPLY VOLTAGE (V) 1787 G01 Input Offset Voltage vs ...

Page 5

... Step Response 128mV SENSE 100mV 0V 1V 500mV 0pF OUT Step Response –128mV SENSE 0V –100mV 0V –500mV – 1000pF OUT LT1787/LT1787HV Positive Input Sense Current vs Sense Voltage (2. 60V S SENSE –128 128 – ...

Page 6

... LT1787/LT1787HV W U TYPICAL PERFORMANCE CHARACTERISTICS Step Response 128mV to –128mV SENSE 100mV –100mV 1V 0V – 2200pF 1787 G15 OUT 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 ...

Page 7

... The LT1787’s input offset voltage gives high resolution for low sense voltages. This wide OUT operating dynamic range gives the user wide latitude in tailoring the range and resolution of his supply monitoring . BIAS function. LT1787/LT1787HV + FIL V BIAS ...

Page 8

... LT1787/LT1787HV U U APPLICATIONS INFORMATION Kelvin connection of the LT1787’s V the sense resistor should be used in all but the lowest power applications. Solder connections and PC board interconnect resistance (approximately 0.5m per square) can be a large error in high current systems. A 5-Amp application might choose a 20m sense resistor to give a 100mV full-scale input to the LT1787 ...

Page 9

... F03 1 FIL DNC – FIL may be OUT LT1787/LT1787HV R SENSE 3. 60V 1 8 – + FIL FIL LT1787HV – BIAS DNC C2 R OUT OUT C3* 1000pF OUTPUT = 1.25V BIAS 1 3.3V TO 60V ...

Page 10

... OUT A + LT1495 LT1389-1.25 1787 F07 Figure 9. Expanded Scale of Unidirectional Output above ground. The level shifting may BIAS and V BIAS OUT R SENSE TO 2. 60V 0 – + FIL FIL LT1787HV – BIAS DNC R OUT OUT V OUT 1787 F08 ...

Page 11

... DWG # 05-08-1610) 0.053 – 0.069 (1.346 – 1.752) 0.004 – 0.010 (0.101 – 0.254) 0.050 0.014 – 0.019 (0.355 – 0.483) (1.270) BSC TYP LT1787/LT1787HV specification –0.75V. OMAX S 0.118 0.004* (3.00 0.102 0.118 0.004** 0.193 0.006 (3.00 0.102) (4 ...

Page 12

... LT1787/LT1787HV U TYPICAL APPLICATION Split or Single Supply Operation, Bidirectional Output into A/D I 125mA – SRCE FIL 4.75V – DNC –5V RELATED PARTS PART NUMBER DESCRIPTION LTC1043 Dual Precision Instrumentation Switched Capacitor Building Block LT1490/LT1491 Dual and Quad Micropower Rail-to-Rail Input and Output Op Amps ...

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