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具整合式分流電阻器的數位電源監測器

INA745B

現行

具 800-µΩ EZShunt™ 技術的 40-V 16 位元 I²C 數位電源監控器

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產品規格表

INA745B

現行
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產品詳細資料

Common-mode voltage (max) (V) 40 Common-mode voltage (min) (V) -0.1 Continuous current (max) (A) 35 Input offset current (±) (max) (mA) 62.5 Input offset current drift (±) (typ) (µA/°C) 5 Gain error (%) 0.1 Iq (max) (mA) 1 Digital interface I2C Resolution (Bits) 16 Features Alert Function, Bidirectional, Digital Temp Monitor, Integrated Power Monitor, Integrated Shunt, Low-side Capable, Standard precision Rating Catalog Operating temperature range (°C) -40 to 125
Common-mode voltage (max) (V) 40 Common-mode voltage (min) (V) -0.1 Continuous current (max) (A) 35 Input offset current (±) (max) (mA) 62.5 Input offset current drift (±) (typ) (µA/°C) 5 Gain error (%) 0.1 Iq (max) (mA) 1 Digital interface I2C Resolution (Bits) 16 Features Alert Function, Bidirectional, Digital Temp Monitor, Integrated Power Monitor, Integrated Shunt, Low-side Capable, Standard precision Rating Catalog Operating temperature range (°C) -40 to 125
VQFN (REL) 14 15 mm² (5 mm × 3 mm)
  • Low loss integrated shunt resistor
    • Internal resistance: 800µΩ, TA = 25°C
    • Continuous current: ±35A, TA = 25°C
    • Peak measurement capability: ±39.32A
  • Current monitoring accuracy: A/B Grade (maximum)
    • Offset current: ±6.25mA / ±62.5mA
    • Offset drift: ±30µA/°C (A and B Grades)
    • System gain error: ±0.75% / ±1.25%
    • Common-mode rejection: ±0.125 / ±1.25mA/V
  • Power monitoring accuracy: A/B Grade, (maximum)
    • ±0.9% / ±1.6% at 25°C, full scale
  • Energy and charge accuracy: A/B Grade, (maximum)
    • ±1.4% / ±2.1% at 25°C, full scale
  • Temperature sensor: ±1.5°C (maximum at 25°C)
  • Precision oscillator: ±0.5% (maximum at 25°C)
  • Programmable conversion time and averaging
  • 2.94MHz high-speed I2C interface with 16 pin-selectable addresses
  • Operates from a 2.7V to 5.5V supply:
    • Operational current: 640µA (typical)
    • Shutdown current: 5µA (maximum)
  • Low loss integrated shunt resistor
    • Internal resistance: 800µΩ, TA = 25°C
    • Continuous current: ±35A, TA = 25°C
    • Peak measurement capability: ±39.32A
  • Current monitoring accuracy: A/B Grade (maximum)
    • Offset current: ±6.25mA / ±62.5mA
    • Offset drift: ±30µA/°C (A and B Grades)
    • System gain error: ±0.75% / ±1.25%
    • Common-mode rejection: ±0.125 / ±1.25mA/V
  • Power monitoring accuracy: A/B Grade, (maximum)
    • ±0.9% / ±1.6% at 25°C, full scale
  • Energy and charge accuracy: A/B Grade, (maximum)
    • ±1.4% / ±2.1% at 25°C, full scale
  • Temperature sensor: ±1.5°C (maximum at 25°C)
  • Precision oscillator: ±0.5% (maximum at 25°C)
  • Programmable conversion time and averaging
  • 2.94MHz high-speed I2C interface with 16 pin-selectable addresses
  • Operates from a 2.7V to 5.5V supply:
    • Operational current: 640µA (typical)
    • Shutdown current: 5µA (maximum)

The INA745x is a digital power monitor with an integrated current sensing element along with a 16-bit delta-sigma ADC specifically designed for current-sensing applications. The device can measure full-scale currents up to ±39.32A with common-mode voltage support from –0.1V to +40V.

The INA745x reports current, bus voltage, die temperature, power, energy and charge accumulation while employing a precision ±0.5% integrated oscillator, all while performing the needed calculations in the background. The integrated temperature sensor is ±2.5°C accurate over the junction temperature range.

The low offset and gain drift design of the INA745x allows the device to be used in precise systems that do not undergo multi-temperature calibration during manufacturing.

The device allows for selectable ADC conversion times from 50µs to 4.12ms as well as sample averaging from 1x to 1024x, which further helps reduce the noise of the measured data.

The INA745x is a digital power monitor with an integrated current sensing element along with a 16-bit delta-sigma ADC specifically designed for current-sensing applications. The device can measure full-scale currents up to ±39.32A with common-mode voltage support from –0.1V to +40V.

The INA745x reports current, bus voltage, die temperature, power, energy and charge accumulation while employing a precision ±0.5% integrated oscillator, all while performing the needed calculations in the background. The integrated temperature sensor is ±2.5°C accurate over the junction temperature range.

The low offset and gain drift design of the INA745x allows the device to be used in precise systems that do not undergo multi-temperature calibration during manufacturing.

The device allows for selectable ADC conversion times from 50µs to 4.12ms as well as sample averaging from 1x to 1024x, which further helps reduce the noise of the measured data.
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技術文件

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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 INA745x 40V , 16 -Bit, Precision I2C Output Digital Power Monitor With EZShunt Technology datasheet (Rev. B) PDF | HTML 2025/8/22
應用說明 Risks and Prevention of ESD, EOS, and Latch Up Events for Current Sense Amplifiers PDF | HTML 2024/11/18
應用說明 How EZShunt Technology Simplifies and Reduces Error in Shunt-Based Designs PDF | HTML 2024/6/27
證書 INA745BEVM EU Declaration of Conformity (DoC) 2023/5/18

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

INA745-INA746EVM — 適用 EZShunt™ 數位電源監控器且具內建分流電阻器的 INA745 和 INA746

INA745 和 IN746 評估模組 (EVM) 是一款精巧的平台，用於評估採用 EZShunt™ 技術的 INA745A、INA745B 或 INA746 高精度數位電源監控器在指定輸入電流、共模電壓和溫度範圍內的主要特性與性能。對性能評估的儀器需求極低，且裝置配備內部分流器，可快速縮短建立原型時間。需要能夠驅動所需輸入電流與共模電壓的輸入來源。

INA745-INA746EVM 電源供應器和透過 GUI 進行的數位輸入與輸出操作，由評估模組 (TI-SCB) (單獨販售) 的感測器控制板 (SCB) 負責處理。直覺式 GUI 可簡化裝置配置，讓使用者能夠快速熟悉裝置操作。

使用指南: PDF | HTML
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IDE、配置、編譯器或偵錯程式

ASC-STUDIO-INA745 — ASC Studio (SysConfig) for configuring all aspects of the INA745 current sensor

SysConfig can be used to help simplify configuration challenges and accelerate software development with the INA745 current sensor.
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模擬工具

PSPICE-FOR-TI — PSpice® for TI 設計與模擬工具

PSpice® for TI 是有助於評估類比電路功能的設計和模擬環境。這款全功能設計和模擬套件使用 Cadence® 的類比分析引擎。PSpice for TI 包括業界最大的模型庫之一，涵蓋我們的類比和電源產品組合，以及特定類比行為模型，且使用無需支付費用。

PSpice for TI 設計和模擬環境可讓您使用其內建函式庫來模擬複雜的混合訊號設計。在進行佈局和製造之前，建立完整的終端設備設計和解決方案原型，進而縮短上市時間並降低開發成本。 

在 PSpice for TI 設計與模擬工具中，您可以搜尋 TI (...)
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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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封裝 針腳 CAD 符號、佔位空間與 3D 模型
VQFN (REL) 14 Ultra Librarian
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