Overview
The LMP8640MK-F/NOPB, produced by Texas Instruments, is a precision high-voltage current sense amplifier. This device is part of the LMP8640 family and is designed to detect small differential voltages across a sense resistor in the presence of high input common-mode voltages. It operates with a supply voltage range from 2.7 V to 12 V and is available in a 6-pin Thin SOT-23 package. The LMP8640 is ideal for sensing and monitoring currents in DC or battery-powered systems, offering excellent AC and DC specifications over temperature and minimizing errors in the current sense loop.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Common-Mode Voltage Range | -2 V to 42 V | V |
| Supply Voltage Range | 2.7 V to 12 V | V |
| Gain Options | 20 V/V, 50 V/V, 100 V/V | V/V |
| Max Gain Error | 0.25% | % |
| Low Offset Voltage | 900 µV | µV |
| Input Bias Current | 13 µA | µA |
| PSRR | 85 dB | dB |
| CMRR (2.1V to 42V) | 103 dB | dB |
| Temperature Range | -40°C to 125°C | °C |
| Package | 6-Pin Thin SOT-23 |
Key Features
- High common-mode voltage range: -2 V to 42 V for LMP8640 and LMP8640-Q1, and -2 V to 76 V for LMP8640HV.
- Fixed gain options: 20 V/V, 50 V/V, and 100 V/V with a gain accuracy as low as 0.25%.
- Low offset voltage: 900 µV.
- High power supply rejection ratio (PSRR): 85 dB.
- High common-mode rejection ratio (CMRR): 103 dB.
- Buffered output to provide low output impedance.
- Operating temperature range: -40°C to 125°C.
- AEC-Q100 grade 1 qualified version (LMP8640-Q1) for automotive applications.
Applications
- High-side current sensing in DC or battery-powered systems.
- Vehicle current measurement.
- Motor controls.
- Battery monitoring.
- Remote sensing devices.
- Power management systems.
- Industrial and consumer applications.
- Automotive applications (LMP8640-Q1).
Q & A
- What is the common-mode voltage range of the LMP8640?
The LMP8640 has a common-mode voltage range of -2 V to 42 V, while the LMP8640HV extends this range to -2 V to 76 V.
- What are the gain options available for the LMP8640?
The LMP8640 offers fixed gain options of 20 V/V, 50 V/V, and 100 V/V.
- What is the maximum gain error of the LMP8640?
The maximum gain error of the LMP8640 is 0.25%.
- What is the input bias current of the LMP8640?
The input bias current of the LMP8640 is 13 µA.
- What is the power supply rejection ratio (PSRR) of the LMP8640?
The PSRR of the LMP8640 is 85 dB.
- What is the common-mode rejection ratio (CMRR) of the LMP8640?
The CMRR of the LMP8640 is 103 dB for the range 2.1 V to 42 V.
- What is the operating temperature range of the LMP8640?
The operating temperature range of the LMP8640 is -40°C to 125°C.
- Is the LMP8640 available in an automotive-grade version?
Yes, the LMP8640-Q1 is an AEC-Q100 grade 1 qualified version for automotive applications.
- What package type is the LMP8640 available in?
The LMP8640 is available in a 6-pin Thin SOT-23 package.
- What are some typical applications of the LMP8640?
Typical applications include high-side current sensing, vehicle current measurement, motor controls, battery monitoring, and power management systems).
