型号INA281
品牌
分类模拟电流检测放大器
描述-4V 至 110V、1.3MHz 高精度电流感应放大器
相关操作
产品概述

参数

Product type Analog output
Common-mode voltage (max) (V) 110
Common-mode voltage (min) (V) -4
Input offset (±) (max) (V) 0.00015
Input offset drift (±) (typ) (V/°C) 0.00000007
Voltage gain (V/V) 20, 50, 100, 200, 500
CMRR (min) (dB) 120
Bandwidth (MHz) 1.3
Supply voltage (max) (V) 20
Supply voltage (min) (V) 2.7
Iq (max) (mA) 2.25
Number of channels 1
Comparators (#) 0
Gain error (%) 0.5
Gain error drift (±) (max) (ppm/°C) 20
Slew rate (V/µs) 2.5
Features High precision, Low-side Capable
Rating Catalog
Operating temperature range (°C) -40 to 125

封装 | 引脚 | 尺寸

SOT-23 (DBV) 5 8.12 mm² 2.9 x 2.8

特性

  • Wide common-mode voltage:
    • 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:
      • 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
  • High bandwidth: 1.3 MHz
  • Slew rate: 2.5V/µs
  • Quiescent current: 1.5 mA

说明

The INA281 is a high-precision current sense 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).

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.

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.