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INA281B3IDBVT

更新时间： 2024-11-22 02:46:43
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德州仪器 - TI /
页数 文件大小 规格书
28页 1478K
描述
INA281, –4-V to 110-V, 1.3-MHz Current-Sense Amplifier

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INA281B3IDBVT 数据手册

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INA281  
SBOSA29 –JUNE 2020  
INA281, –4-V to 110-V, 1.3-MHz Current-Sense Amplifier  
1 Features  
3 Description  
The INA281 is  
a high-precision current sense  
1
•
•
•
Wide common-mode voltage:  
amplifier that can measure voltage drops across  
shunt resistors over a wide common-mode range  
from –4 V to 110 V. The negative common-mode  
voltage allows the device to operate below ground,  
thus accommodating precise measurement of  
recirculating currents in half-bridge applications. The  
combination of a low offset voltage, small gain error  
and high DC CMRR enables highly accurate current  
measurement. The INA281 is not only designed for  
DC current measurement, but also for high-speed  
applications (like fast overcurrent protection, for  
example) with a high bandwidth of 1.3 MHz and an  
65-dB AC CMRR (at 50 kHz).  
–
–
Operational voltage: −4 V to +110 V  
Survival voltage: −20 V to +120 V  
Excellent CMRR:  
–
–
120-dB DC CMRR  
65-dB AC CMRR at 50 kHz  
Accuracy:  
–
Gain:  
–
–
Gain error: ±0.5% (maximum)  
Gain drift: ±20 ppm/°C (maximum)  
–
Offset:  
The INA281 operates from a single 2.7-V to 20-V  
supply, drawing 1.5 mA of supply current. The  
INA281 is available with five gain options: 20 V/V, 50  
V/V, 100 V/V, 200 V/V, and 500 V/V. These gain  
options address wide dynamic range for current-  
sensing applications.  
–
–
Offset voltage: ±55 µV (typical)  
Offset drift: ±0.1 µV/°C (typical)  
•
Available gains:  
–
–
–
–
–
INA281A1, INA281B1 : 20 V/V  
INA281A2, INA281B2 : 50 V/V  
INA281A3, INA281B3 : 100 V/V  
INA281A4, INA281B4 : 200 V/V  
INA281A5, INA281B5 : 500 V/V  
The INA281 is specified over an operating  
temperature range of −40 °C to +125 °C and is  
offered in a space-saving SOT-23 package with two  
pin-out variants.  
•
•
•
High bandwidth: 1.3 MHz  
Slew rate: 2.5V/µs  
Device Information(1)  
PART NUMBER  
INA281  
PACKAGE  
BODY SIZE (NOM)  
Quiescent current: 1.5 mA  
SOT-23 (5)  
2.90 mm × 1.60 mm  
2 Applications  
(1) For all available packages, see the package option addendum  
at the end of the data sheet.  
•
•
•
•
Active antenna system mMIMO (AAS)  
Macro remote radio unit (RRU)  
48-V rack server  
Functional Block Diagram  
VS  
VCM  
48-V merchant network & server power supply  
(PSU)  
ISENSE  
•
•
•
•
Solenoid control  
Valve control  
R1  
IN+  
+
Current  
RSENSE  
Bias  
Feedback  
R1  
Telecom equipment  
Power supplies  
OUT  
-
INœ  
Buffer  
Load  
RL  
GND  
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,  
intellectual property matters and other important disclaimers. PRODUCTION DATA.  
 
 
 
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