产品详细信息

Common mode voltage (Max) (V) 42 Common mode voltage (Min) (V) -2 Input offset (+/-) (Max) (uV) 1000 Input offset drift (+/-) (Typ) (uV/C) 4 Gain (V/V) Adjustable Gain error (%) 2 Gain error drift (+/-) (Max) (ppm/°C) 140 CMRR (Min) (dB) 60 Bandwidth (kHz) 990 Supply voltage (Max) (V) 12 Supply voltage (Min) (V) 2.7 Iq (Max) (mA) 0.61 Number of channels (#) 1 Comparators (#) 0 Features Low-side Capable, Programmable Gain Rating Catalog Operating temperature range (C) -40 to 125
Common mode voltage (Max) (V) 42 Common mode voltage (Min) (V) -2 Input offset (+/-) (Max) (uV) 1000 Input offset drift (+/-) (Typ) (uV/C) 4 Gain (V/V) Adjustable Gain error (%) 2 Gain error drift (+/-) (Max) (ppm/°C) 140 CMRR (Min) (dB) 60 Bandwidth (kHz) 990 Supply voltage (Max) (V) 12 Supply voltage (Min) (V) 2.7 Iq (Max) (mA) 0.61 Number of channels (#) 1 Comparators (#) 0 Features Low-side Capable, Programmable Gain Rating Catalog Operating temperature range (C) -40 to 125
SOT-23-THN (DDC) 6 5 mm² 2.9 x 1.6
  • Typical Values, TA = 25°C
  • High Common-Mode Voltage Range
    • LMP8645 –2 V to 42 V
    • LMP8645HV –2 V to 76 V
  • Supply Voltage Range 2.7 V to 12 V
  • Gain Configurable With a Single Resistor
  • Maximum Variable Gain Accuracy (With
    External Resistor) 2%
  • Transconductance 200 µA/V
  • Low Offset Voltage 1 mV
  • Input Bias 12 µA
  • PSRR 90 dB
  • CMRR 95 dB
  • Temperature Range –40°C to 125°C
  • 6-Pin SOT Package
  • Typical Values, TA = 25°C
  • High Common-Mode Voltage Range
    • LMP8645 –2 V to 42 V
    • LMP8645HV –2 V to 76 V
  • Supply Voltage Range 2.7 V to 12 V
  • Gain Configurable With a Single Resistor
  • Maximum Variable Gain Accuracy (With
    External Resistor) 2%
  • Transconductance 200 µA/V
  • Low Offset Voltage 1 mV
  • Input Bias 12 µA
  • PSRR 90 dB
  • CMRR 95 dB
  • Temperature Range –40°C to 125°C
  • 6-Pin SOT Package

The LMP8645 and the LMP8645HV devices are precision current sense amplifiers that detect small differential voltages across a sense resistor in the presence of high-input common-mode voltages.

Operating from a supply range of 2.7 V to 12 V, the LMP8645 accepts input signals with a common-mode voltage range of –2 V to 42 V, while the LMP8645HV accepts input signals with a common-mode voltage range of –2 V to 76 V. The LMP8645 and LMP8645HV have adjustable gain for applications where supply current and high common-mode voltage are the determining factors. The gain is configured with a single resistor, providing a high level of flexibility, as well as accuracy as low as 2% (maximum) including the gain setting resistor. The output is buffered to provide low output impedance. This high-side current sense amplifier is ideal for sensing and monitoring currents in DC or battery-powered systems, has excellent AC and DC specifications over temperature, and keeps errors in the current sense loop to a minimum. The LMP8645 is an ideal choice for industrial, automotive, and consumer applications, and is available in SOT-6 package.

The LMP8645 and the LMP8645HV devices are precision current sense amplifiers that detect small differential voltages across a sense resistor in the presence of high-input common-mode voltages.

Operating from a supply range of 2.7 V to 12 V, the LMP8645 accepts input signals with a common-mode voltage range of –2 V to 42 V, while the LMP8645HV accepts input signals with a common-mode voltage range of –2 V to 76 V. The LMP8645 and LMP8645HV have adjustable gain for applications where supply current and high common-mode voltage are the determining factors. The gain is configured with a single resistor, providing a high level of flexibility, as well as accuracy as low as 2% (maximum) including the gain setting resistor. The output is buffered to provide low output impedance. This high-side current sense amplifier is ideal for sensing and monitoring currents in DC or battery-powered systems, has excellent AC and DC specifications over temperature, and keeps errors in the current sense loop to a minimum. The LMP8645 is an ideal choice for industrial, automotive, and consumer applications, and is available in SOT-6 package.

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技术文档

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类型 标题 下载最新的英文版本 日期
* 数据表 LMP8645, LMP8645HV Precision High Voltage Current Sense Amplifier 数据表 (Rev. G) 2015年 9月 30日
技术文章 Solving the multidecade current-measurement challenge in your 48-V BMS application 2021年 6月 14日
技术文章 How current-sense amplifiers monitor satellite health 2021年 2月 8日
技术文章 A key to accurate system thermal management: monitoring both current flow and temperature 2018年 10月 4日
选择指南 电源管理指南 2018 (Rev. K) 2018年 7月 31日
选择指南 电源管理指南 2018 (Rev. R) 2018年 6月 25日
技术文章 System trade-offs for high- and low-side current measurements 2017年 6月 1日
应用手册 具有增强型PWM 抑制功能的低漂移、精密直列式电机电流测量 (Rev. A) 下载最新的英文版本 (Rev.C) 2017年 1月 26日
用户指南 AN-1975 LMP8640 / LMP8645 Evaluation Board User Guide (Rev. C) 2013年 4月 26日

设计与开发

有关其他条款或所需资源,请点击下面的任何链接来查看详情页面。

评估板

LMP8645MKEVAL — 用于 LMP8645 的评估板

The LMP8645 Current Sense Evaluation Board is designed to evaluate the LMP8645, Precision Current Sensing Amplifier with adjustable gain. This board show a typical configuration of a bidirectional current sense with two LMP8645 parts mounted on the PCB together with the required de-coupling (...)

现货
数量限制: 3
仿真模型

LMP8645 PSPICE Model (Rev. A)

SNOM087A.ZIP (18 KB) - PSpice Model
仿真工具

PSPICE-FOR-TI — PSPICE® for TI design and simulation tool

PSpice® for TI 可提供帮助评估模拟电路功能的设计和仿真环境。此功能齐全的设计和仿真套件使用 Cadence® 的模拟分析引擎。PSpice for TI 可免费使用,包括业内超大的模型库之一,涵盖我们的模拟和电源产品系列以及精选的模拟行为模型。

借助 PSpice for TI 的设计和仿真环境及其内置的模型库,您可对复杂的混合信号设计进行仿真。创建完整的终端设备设计和原型解决方案,然后再进行布局和制造,可缩短产品上市时间并降低开发成本。 

在 PSpice for TI 设计和仿真工具中,您可以搜索 TI (...)
仿真工具

TINA-TI — 基于 SPICE 的模拟仿真程序

TINA-TI 提供了 SPICE 所有的传统直流、瞬态和频域分析以及更多。TINA 具有广泛的后处理功能,允许您按照希望的方式设置结果的格式。虚拟仪器允许您选择输入波形、探针电路节点电压和波形。TINA 的原理图捕获非常直观 - 真正的“快速入门”。

TINA-TI 安装需要大约 500MB。直接安装,如果想卸载也很容易。我们相信您肯定会爱不释手。

TINA 是德州仪器 (TI) 专有的 DesignSoft 产品。该免费版本具有完整的功能,但不支持完整版 TINA 所提供的某些其他功能。

如需获取可用 TINA-TI 模型的完整列表,请参阅:SpiceRack - 完整列表 

需要 HSpice (...)

设计工具

CIRCUIT060035 — 具有窗口比较器的双向电流感应电路

该双向电流检测解决方案使用一个电流检测放大器和一个高速双路比较器,在输入电流 (IG1) 升至 100A 以上或降至 -35A 以下时,通过轨到轨输入共模范围在比较器输出端(OUTA 和 OUTB)产生过流 (OC) 警报信号。在此实现中,过流警报信号均为高电平有效,因此在超过 100A 或 -35A 阈值时,比较器输出为高电平。两个比较器均执行外部迟滞,因此在电流降低 10%(90A 和 -31A)时,比较器输出会恢复为逻辑低电平状态。当下方电路中的分流电阻器 R8 接地时,此电路适用于在高达 INA 的共模电压范围内进行高侧电流检测。
设计工具

CIRCUIT060037 — 精密过流锁存电路

该高侧电流检测解决方案使用一个电流检测放大器、一个带有集成基准的比较器和一个 P 沟道 MOSFET 来创建一个过流锁存电路。当检测到大于 200mA 的负载电流时,电路将断开系统与其电源的连接。比较器输出将进行锁存(将 P 沟道 MOSFET 的栅源电压保持在 0V),直到电路循环供电,原因在于比较器驱动 P 沟道 MOSFET 的栅极并将信号反馈回电流检测放大器的基准引脚。
参考设计

TIDA-00302 — 具有瞬态鲁棒性的电流分流监控器参考设计

此高侧电流分流监控器用于测量当电流通过电流感应电阻器时在电阻器上形成的电压。

此外,还采用外部保护电路来提供浪涌保护和快速瞬变保护并展示基于 IEC61000-4-4 和 IEC61000-4-5 的不同抗扰度。

封装 引脚 下载
SOT-23-THIN (DDC) 6 了解详情

订购与质量

包含信息:
  • RoHS
  • REACH
  • 器件标识
  • 引脚镀层/焊球材料
  • MSL 等级/回流焊峰值温度
  • MTBF/FIT 估算
  • 材料成分
  • 认证摘要
  • 持续可靠性监测

支持与培训

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