LMP8481
- Typical values: TA = 25°C
- Bidirectional or unidirectional sensing
- Common mode voltage range: 4.0V to 76V
- Supply voltage range: 4.5V to 76V
- Fixed gains: 20, 60, and 100V/V
- Gain accuracy: ±0.1%
- Offset: ±80µV
- Bandwidth (–3dB): 270kHz
- Quiescent current: < 100µA
- Buffered high-current output: > 5mA
- Input bias current: 7µA
- PSRR (DC): 122dB
- CMRR (DC): 124dB
- Temperature range: –40°C to 125°C
The LMP8480 and LMP8481 are precision high-side current sense amplifiers that amplify a small differential voltage developed across a current sense resistor in the presence of high input common-mode voltages. These amplifiers are designed for bidirectional (LMP8481) or unidirectional (LMP8480) current applications and accept input signals with common-mode voltage range from 4V to 76V with a bandwidth of 270kHz. Because the operating power supply range overlaps the input common-mode voltage range, the LMP848x can be powered by the same voltage that is being monitored. This benefit eliminates the need for an intermediate supply voltage to be routed to the point of load where the current is being monitored, resulting in reduced component count and board space.
The LMP848x family consists of fixed gains of 20, 60, and 100 for applications that demand high accuracy over temperature. The low-input offset voltage allows the use of smaller sense resistors without sacrificing system error. The wide operating temperature range of –40°C to 125°C makes the LMP848x an ideal choice for automotive, telecommunications, industrial, and consumer applications. The LMP8480 and LMP8481 are pin-for-pin replacements for the MAX4080 and MAX4081, offering improved offset voltage, wider reference adjust range and higher output drive capabilities. The LMP8480 and LMP8481 are available in a 8-pin VSSOP package.
技術文件
| 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 | LMP848x Precision 76V High-Side Current Sense Amplifiers With Voltage Output datasheet (Rev. F) | PDF | HTML | 2026/5/14 | ||
| 應用說明 | Using a PCB Copper Trace as a Current Sense Shunt Resistor (Rev. A) | PDF | HTML | 2026/4/27 | |||
| Application brief | Improving Power Amplifier Efficiency With Current Monitors (Rev. B) | PDF | HTML | 2023/7/24 | |||
| Application brief | Current Mode Control in Switching Power Supplies (Rev. E) | PDF | HTML | 2023/4/12 | |||
| Application brief | Switching Power Supply Current Measurements (Rev. E) | PDF | HTML | 2023/4/7 | |||
| Application brief | Low-Drift, Precision, In-Line Motor Current Measurements With PWM Rejection (Rev. D) | PDF | HTML | 2023/4/7 | |||
| 電子書 | An Engineer's Guide to Current Sensing (Rev. B) | 2022/4/12 | ||||
| 選擇指南 | Current Sense Amplifiers (Rev. E) | 2021/9/20 | ||||
| 使用指南 | LMP8480EVM Current Shunt Monitors Guide (Rev. A) | 2013/3/19 |
設計與開發
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LMP848XMMEVM-X — LMP8480 和 LMP8481 評估工具
The Texas Instruments LMP8480/81 evaluation module (EVM) helps designers quickly evaluate the operation and performance of the LMP8480/81 76V Precision High Side Current Sense Amplifier. The EVM is ready to connect to power, load, and test instruments through the use of on-board terminals.
The EVM (...)
CS-AMPLIFIER-ERROR-TOOL — Current Sense Amplifier Comparison and Error Tool
PMP9297 — 適用於 GaN 音訊應用的 150W 雙通道同步升壓
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TIDA-00302 — 具瞬態穩定性的電流分流監控器參考設計
此高壓側電流分流監控器可用於測量電流通過电流感测電阻器時在电阻器上所形成的電壓。
此外，實作外部保護電路以提供突波和快速暫態保護，並針對 IEC61000-4-4 和 IEC61000-4-5 展示不同的抗擾度等級。
| 封裝 | 針腳 | CAD 符號、佔位空間與 3D 模型 |
|---|---|---|
| VSSOP (DGK) | 8 | Ultra Librarian |