Overview
The LMP8601QMA/NOPB, produced by Texas Instruments, is a fixed-gain, precision current-sense amplifier designed for both unidirectional and bidirectional current sensing applications. This device is part of the LMP860x-Q1 family, which is specifically enhanced for the automotive market and complies with the AEC-Q100 standard. The LMP8601QMA/NOPB operates with a precise gain of 20x, making it suitable for driving an ADC to full-scale value in various applications.
Key Specifications
| Parameter | Min | Max | Unit | |
|---|---|---|---|---|
| Supply Voltage (VS - GND) | 3 | - | 5.5 | V |
| Input Common-Mode Voltage Range (VS = 3.3V) | -4 | - | 27 | V |
| Input Common-Mode Voltage Range (VS = 5V) | -22 | - | 60 | V |
| Total Gain | 19.9 | 20 | 20.1 | V/V |
| Input Offset Voltage | - | - | 1 | mV |
| TCVOS (Input Offset Voltage Drift) | - | - | 10 | μV/°C |
| CMRR (Common-Mode Rejection Ratio) | - | - | 90 | dB |
| Operating Temperature Range | -40 | - | 125 | °C |
| Package Type | - | - | SOIC (8) | - |
Key Features
- Precise gain of 20x for the LMP8601QMA/NOPB, achieved through a two-stage amplifier configuration (10x preamplifier and 2x output stage buffer amplifier).
- Single-supply bidirectional operation, enabling current sensing in both directions.
- Wide input common-mode voltage range: –4 V to +27 V with a 3.3-V supply, and –22 V to +60 V with a 5-V supply.
- High common-mode rejection ratio (CMRR) of 90 dB minimum.
- Low input offset voltage of 1 mV maximum.
- Temperature coefficient of the input offset voltage (TCVOS) of 10 μV/°C maximum.
- AEC-Q100 qualified for automotive applications with temperature grades 1 and 0 (for LMP8601EDRQ1 only).
- Enhanced ESD protection: HBM ESD classification level 2 (3A on inputs).
Applications
- High-side and low-side driver configuration current sensing.
- Bidirectional current measurement.
- Current loop to voltage conversion.
- Automotive applications such as fuel injection control, transmission control, and power steering.
- Battery management systems.
Q & A
- What is the primary function of the LMP8601QMA/NOPB?
The primary function is to serve as a fixed-gain, precision current-sense amplifier for unidirectional and bidirectional current sensing applications. - What is the gain of the LMP8601QMA/NOPB?
The gain is precisely 20x. - What is the input common-mode voltage range for the LMP8601QMA/NOPB when operating from a 3.3-V supply?
The range is –4 V to +27 V. - What is the input common-mode voltage range for the LMP8601QMA/NOPB when operating from a 5-V supply?
The range is –22 V to +60 V. - What is the CMRR of the LMP8601QMA/NOPB?
The CMRR is 90 dB minimum. - What is the maximum input offset voltage of the LMP8601QMA/NOPB?
The maximum input offset voltage is 1 mV. - Is the LMP8601QMA/NOPB qualified for automotive applications?
Yes, it is AEC-Q100 qualified. - What are the operating temperature ranges for the LMP8601QMA/NOPB?
The operating temperature range is –40°C to 125°C, with a special version (LMP8601EDRQ1) operating up to 150°C. - What type of ESD protection does the LMP8601QMA/NOPB have?
The device has HBM ESD classification level 2 (3A on inputs). - In what package type is the LMP8601QMA/NOPB available?
The device is available in an SOIC (8) package.
