Overview
The LMP8640MKX-T/NOPB, produced by Texas Instruments, is a precision high-voltage current sense amplifier. This device is designed to detect small differential voltages across a sense resistor in the presence of high input common-mode voltages. It is available in several variants, including the LMP8640, LMP8640-Q1, and LMP8640HV, each catering to different application requirements. The LMP8640 and LMP8640-Q1 have a common-mode voltage range of -2 V to 42 V, while the LMP8640HV extends this range to -2 V to 76 V. These amplifiers are ideal for sensing and monitoring currents in DC or battery-powered systems, ensuring high accuracy and minimal errors in the current sense loop.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Common-Mode Voltage Range | -2 V to 42 V (LMP8640, LMP8640-Q1), -2 V to 76 V (LMP8640HV) | 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
- Precision high-voltage current sense amplifier with high common-mode voltage range.
- Fixed gain options (20 V/V, 50 V/V, 100 V/V) ensuring high accuracy over temperature.
- Low offset voltage of 900 µV and low input bias current of 13 µA.
- High power supply rejection ratio (PSRR) of 85 dB and common-mode rejection ratio (CMRR) of 103 dB.
- Buffered output to provide low output impedance.
- AEC-Q100 grade 1 qualified version (LMP8640-Q1) available for automotive applications.
Applications
- High-side current sensing in DC or battery-powered systems.
- Vehicle current measurement and motor controls.
- Battery monitoring and remote sensing devices.
- Power management systems.
- Industrial and consumer applications, with the LMP8640-Q1 specifically suited for automotive use.
Q & A
- What is the common-mode voltage range of the LMP8640 and LMP8640-Q1? The common-mode voltage range for the LMP8640 and LMP8640-Q1 is -2 V to 42 V.
- What is the common-mode voltage range of the LMP8640HV? The common-mode voltage range for the LMP8640HV is -2 V to 76 V.
- What are the gain options available for the LMP8640 series? The gain options are 20 V/V, 50 V/V, and 100 V/V.
- What is the maximum gain error for the LMP8640 series? The maximum gain error is 0.25%.
- What is the input bias current of the LMP8640 series? The input bias current is 13 µA.
- What is the temperature range for the LMP8640 series? The temperature range is -40°C to 125°C.
- In what package is the LMP8640 series available? The LMP8640 series is available in a 6-Pin Thin SOT-23 package.
- Is there an AEC-Q100 qualified version of the LMP8640 for automotive applications? Yes, the LMP8640-Q1 is AEC-Q100 grade 1 qualified for automotive applications.
- What are some typical applications of the LMP8640 series? Typical applications include high-side current sensing, vehicle current measurement, motor controls, battery monitoring, and power management systems.
- What is the power supply rejection ratio (PSRR) of the LMP8640 series? The PSRR is 85 dB.
