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類比電流感測放大器

INA181

現行

26-V 雙向 350-kHz 電流感測放大器

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INA181

現行
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產品詳細資料

Product type Analog output Common-mode voltage (max) (V) 26 Common-mode voltage (min) (V) -0.2 Input offset (±) (max) (µV) 150 Input offset drift (±) (typ) (µV/°C) 0.2 Features Bidirectional, Low-side Capable Rating Catalog Voltage gain (V/V) 20, 50, 100, 200 CMRR (min) (dB) 84 Bandwidth (kHz) 105, 150, 210, 350 Iq (max) (mA) 0.3 Number of channels 1 Comparators (#) 0 Gain error (%) 0.8 Gain error drift (±) (max) (ppm/°C) 20 Slew rate (V/µs) 2 Operating temperature range (°C) -40 to 125
Product type Analog output Common-mode voltage (max) (V) 26 Common-mode voltage (min) (V) -0.2 Input offset (±) (max) (µV) 150 Input offset drift (±) (typ) (µV/°C) 0.2 Features Bidirectional, Low-side Capable Rating Catalog Voltage gain (V/V) 20, 50, 100, 200 CMRR (min) (dB) 84 Bandwidth (kHz) 105, 150, 210, 350 Iq (max) (mA) 0.3 Number of channels 1 Comparators (#) 0 Gain error (%) 0.8 Gain error drift (±) (max) (ppm/°C) 20 Slew rate (V/µs) 2 Operating temperature range (°C) -40 to 125
SOT-SC70 (DCK) 6 4.2 mm² (2 mm × 2.1 mm) SOT-23 (DBV) 6 8.12 mm² (2.9 mm × 2.8 mm)
  • Common-mode range (V CM): –0.2 V to +26 V
  • High bandwidth: 350 kHz (A1 devices)
  • Offset voltage:
    • ±150 µV (maximum) at V CM = 0 V
    • ±500 µV (maximum) at V CM = 12 V
  • Output slew rate: 2 V/µs
  • Bidirectional current-sensing capability
  • Accuracy:
    • ±1% gain error (maximum)
    • 1-µV/°C offset drift (maximum)
  • Gain options:
    • 20 V/V (A1 devices)
    • 50 V/V (A2 devices)
    • 100 V/V (A3 devices)
    • 200 V/V (A4 devices)
  • Quiescent current: 260 µA maximum (INA181)
  • Common-mode range (V CM): –0.2 V to +26 V
  • High bandwidth: 350 kHz (A1 devices)
  • Offset voltage:
    • ±150 µV (maximum) at V CM = 0 V
    • ±500 µV (maximum) at V CM = 12 V
  • Output slew rate: 2 V/µs
  • Bidirectional current-sensing capability
  • Accuracy:
    • ±1% gain error (maximum)
    • 1-µV/°C offset drift (maximum)
  • Gain options:
    • 20 V/V (A1 devices)
    • 50 V/V (A2 devices)
    • 100 V/V (A3 devices)
    • 200 V/V (A4 devices)
  • Quiescent current: 260 µA maximum (INA181)

The INA181, INA2181, and INA4181 (INAx181) current sense amplifiers are designed for cost-optimized applications. These devices are part of a family of bidirectional, current-sense amplifiers (also called current-shunt monitors) that sense voltage drops across current-sense resistors at common-mode voltages from –0.2 V to +26 V, independent of the supply voltage. The INAx181 family integrates a matched resistor gain network in four, fixed-gain device options: 20 V/V, 50 V/V, 100 V/V, or 200 V/V. This matched gain resistor network minimizes gain error and reduces the temperature drift.

These devices operate from a single 2.7-V to 5.5-V power supply. The single-channel INA181 draws a maximum supply current of 260 µA; whereas, the dual-channel INA2181 draws a maximum supply current of 500 µA, and the quad-channel INA4181 draws a maximum supply current of 900 µA.

The INA181 is available in both the 6-pin, SOT-23 and SC70 packages. The INA2181 is available in 10-pin, VSSOP and WSON packages. The INA4181 is available in a 20-pin, TSSOP package. All device options are specified over the extended operating temperature range of –40°C to +125°C.

The INA181, INA2181, and INA4181 (INAx181) current sense amplifiers are designed for cost-optimized applications. These devices are part of a family of bidirectional, current-sense amplifiers (also called current-shunt monitors) that sense voltage drops across current-sense resistors at common-mode voltages from –0.2 V to +26 V, independent of the supply voltage. The INAx181 family integrates a matched resistor gain network in four, fixed-gain device options: 20 V/V, 50 V/V, 100 V/V, or 200 V/V. This matched gain resistor network minimizes gain error and reduces the temperature drift.

These devices operate from a single 2.7-V to 5.5-V power supply. The single-channel INA181 draws a maximum supply current of 260 µA; whereas, the dual-channel INA2181 draws a maximum supply current of 500 µA, and the quad-channel INA4181 draws a maximum supply current of 900 µA.

The INA181 is available in both the 6-pin, SOT-23 and SC70 packages. The INA2181 is available in 10-pin, VSSOP and WSON packages. The INA4181 is available in a 20-pin, TSSOP package. All device options are specified over the extended operating temperature range of –40°C to +125°C.
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功能相同，但針腳輸出與所比較的裝置不同。
INA180 現行 26V、350kHz 電流感測放大器 The INA180 offers the same performance for uni-directional applications

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重要文件 類型 標題 格式選項 下載最新的英文版本 日期
* 資料表 INAx181 Bidirectional,Low- and High-Side Voltage Output,Current-Sense Amplifiers datasheet (Rev. H) PDF | HTML 2023/11/29
應用說明 Using a PCB Copper Trace as a Current Sense Shunt Resistor (Rev. A) PDF | HTML 2026/4/27
技術文章 以 TI GaN FET 為基礎的 10kW 單相串列式逆變器設計考量 PDF | HTML Download English Version PDF | HTML 2025/4/11
應用說明 Risks and Prevention of ESD, EOS, and Latch Up Events for Current Sense Amplifiers PDF | HTML 2024/11/18
Application brief Introduction to Current Sense Amplifiers PDF | HTML 2022/2/2
選擇指南 Current Sense Amplifiers (Rev. E) 2021/9/20
Circuit design Low-Drift, Low-Side, Bidirectional Current Sensing Circuit (Rev. A) PDF | HTML 2020/12/2
電子書 E-book: An engineer’s guide to industrial robot designs 2020/2/12
Circuit design Adjustable-gain, current-output, high-side current-sensing circuit 2019/8/9
Circuit design Fast-response overcurrent event detection circuit 2019/5/27
Application brief Bidirectional, Low-Side Phase Current Sensing With Onboard Overcurrent Detection (Rev. D) 2019/3/6
應用說明 Closed-Loop Analysis of Load-Induced Amplifier Stability Issues Using Zout 2017/10/27
Application brief Low-Drift, Low-Side Current Measurements for Three-Phase Systems (Rev. B) 2017/9/5
應用說明 Low Cost Bidirectional Current Sensing Using INA181 2017/7/28
技術文章 Precise constant current regulation helps advance fast-charging PDF | HTML 2017/6/15
技術文章 System trade-offs for high- and low-side current measurements PDF | HTML 2017/6/1
Application brief Low-Side Current Sense Circuit Integration 2017/3/30

設計與開發

如需其他條款或必要資源，請按一下下方的任何標題以檢視詳細頁面 (如有)。

開發板

INA180-181EVM — INA180 和 INA181 評估模組

INA180 是運算放大器電流感測整合電路，提供易用性與高性能。INA181 具有與 INA180 相同的功能，但增加了可進行雙向電流測量的參考針腳。INA180-181EVM 旨在提供對此裝置系列的基本功能評估。  此固定裝置配置並非用作目標電路模型，亦非針對電磁相容性 (EMC) 測試所採取的配置。INA180-181EVM 包含一個 PCB，可選擇裁切八個獨立 PCB，適用於八部裝置 (INA180A1、INA180A2、INA180A3、INA180A4、INA181A1、INA181A2、INA181A3 和 INA181A4) 中的每一部。
使用指南: PDF
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模擬型號

INA181 PSpice Model (Rev. B)

SBOMAD5B.ZIP (2070 KB) - PSpice 模型
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模擬型號

INA181 TINA-TI Reference Design (Rev. B)

SBOMAD4B.TSC (2820 KB) - TINA-TI 參考設計
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模擬型號

INA181 TINA-TI Spice Model (Rev. A)

SBOMAD3B (49 KB) - TINA-TI Spice 模型
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模擬型號

INA181A1 PSpice Model

SBOMBB7.ZIP (21 KB) - PSpice 模型
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模擬型號

INA181A2 PSpice Model

SBOMBB8.ZIP (22 KB) - PSpice 模型
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模擬型號

INA181A3 PSpice Model

SBOMBF2.ZIP (22 KB) - PSpice 模型
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模擬型號

INA181A4 PSpice Model

SBOMBC5.ZIP (21 KB) - PSpice 模型
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模擬工具

TINA-TI — 基於 SPICE 的類比模擬程式

TINA-TI provides all the conventional DC, transient and frequency domain analysis of SPICE and much more. TINA has extensive post-processing capability that allows you to format results the way you want them. Virtual instruments allow you to select input waveforms and probe circuit nodes voltages (...)

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計算工具

ANALOG-ENGINEER-CALC — PC software analog engineer's calculator

類比工程師的計算機旨在加速類比電路設計工程師定期使用的許多重複計算。此基於 PC 的工具提供圖形介面，列出各種常見計算，從使用回饋電阻器設定運算放大器增益到選擇適當的電路設計元件以穩定類比數位轉換器 (ADC) 驅動緩衝電路。

除了作為獨立工具使用外，此計算機還與類比工程師口袋參考中描述的概念相得益彰。

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計算工具

CS-AMPLIFIER-ERROR-TOOL — Current Sense Amplifier Comparison and Error Tool

此 Excel 計算機提供兩個與五個標準電流感測放大器的比較，並提供包含各裝置基本參數的圖表。此計算機也會採用使用者的系統條件輸入，例如共模電壓、供應電壓、分流電阻器值與公差，然後在可調整電流範圍中繪製錯誤曲線。此外，計算機會根據計算的全刻度輸入電壓除以最大量測電流，輸出最大分流值 (mΩ)。
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設計工具

CIRCUIT060033 — 具有整合式精密增益的低漂移、低壓側、雙向電流感測電路

下圖所示的低壓側雙向電流分流監控器解決方案可精確測量 –4 A 至 4 A 的電流，且可針對不同電流量測範圍輕鬆變更設計參數。INA21x 系列的電流分流監控器具備整合式精密增益電阻器及零漂移架構，可實現分流器中最大壓降低至 10-mV 的全刻度電流感測。
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設計工具

CIRCUIT060038 — 快速回應過電流事件偵測電路

這是一種快速回應單向電流感測解決方案，通常稱爲過電流防護 (OCP)，可提供 < 2-μs 時間回應、tresp、過電流警報訊號，以關閉超出閾值電流的系統。在此特定設定中，正常運作負載為 80 mA 至 900 mA，過電流閾值定義為 1 A (IOC_TH)。電流分流監控器由 5-V 電源軌供電。OCP 可套用至高壓側與低壓側拓撲。此電路中的解決方案為高壓側實作。此電路對於智慧型揚聲器和擴充底座很有用。
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許多 TI 參考設計包含 INA181

使用我們的參考設計選擇工具，以檢視並找出最適合您的應用和參數的設計。
封裝 針腳 CAD 符號、佔位空間與 3D 模型
SOT-SC70 (DCK) 6 Ultra Librarian
SOT-23 (DBV) 6 Ultra Librarian
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