Overview
The LMP8480MME-S/NOPB is a precision high-side current sense amplifier produced by Texas Instruments. This device is part of the LMP8480 and LMP8481 family, designed to amplify small differential voltages developed across a current sense resistor in high common-mode voltage environments. The LMP8480 is specifically tailored for unidirectional current sensing applications. It operates with a supply voltage range of 4.5 V to 76 V and can handle common-mode input voltages from 4.0 V to 76 V, making it highly versatile for various industrial and automotive applications.
Key Specifications
| Parameter | Min | Typical | Max | Unit |
|---|---|---|---|---|
| Supply Voltage Range | 4.5 | - | 76 | V |
| Common Mode Voltage Range | 4.0 | - | 76 | V |
| Fixed Gains | - | 20, 60, 100 | - | V/V |
| Gain Accuracy | - | ±0.1% | - | % |
| Offset Voltage | - | ±80 µV | - | µV |
| Bandwidth (–3 dB) | - | 270 kHz | - | kHz |
| Quiescent Current | - | < 100 µA | - | µA |
| Output Current (Sourcing) | - | > 5 mA | - | mA |
| Temperature Range | -40 | - | 125 | °C |
| Package Type | - | VSSOP-8 | - | - |
Key Features
- Bidirectional/Unidirectional Sensing: The LMP8480 is designed for unidirectional current sensing, while the LMP8481 supports bidirectional sensing.
- High Accuracy: Features fixed gains of 20, 60, and 100 V/V with a gain accuracy of ±0.1%.
- Low Offset Voltage: Offers a low input offset voltage of ±80 µV, allowing the use of smaller sense resistors without sacrificing system error.
- Wide Operating Range: Operates over a wide supply voltage range of 4.5 V to 76 V and common-mode input voltage range of 4.0 V to 76 V.
- High CMRR and PSRR: Provides high common-mode rejection ratio (CMRR) and power supply rejection ratio (PSRR) of 124 dB and 122 dB, respectively.
- Buffered High-Current Output: Capable of sourcing more than 5 mA of output current.
- Compact Package: Available in an 8-pin VSSOP package.
Applications
- High-Side Current Sense: Ideal for monitoring current in high-side configurations.
- Vehicle Current Measurement: Suitable for automotive applications requiring precise current measurement.
- Telecommunications: Used in telecommunications equipment for current sensing and monitoring.
- Motor Controls: Applied in motor control systems to monitor and regulate current flow.
- Laser or LED Drivers: Used in driving lasers and LEDs where precise current control is necessary.
- Energy Management: Utilized in energy management systems for monitoring and controlling power consumption.
- Solar Panel Monitoring: Employed in solar panel systems to monitor current output.
Q & A
- What is the supply voltage range of the LMP8480?
The supply voltage range of the LMP8480 is from 4.5 V to 76 V.
- What are the fixed gain options available for the LMP8480?
The fixed gain options available are 20, 60, and 100 V/V.
- What is the typical bandwidth of the LMP8480?
The typical bandwidth of the LMP8480 is 270 kHz.
- What is the quiescent current of the LMP8480?
The quiescent current of the LMP8480 is less than 100 µA.
- What is the output current sourcing capability of the LMP8480?
The LMP8480 can source more than 5 mA of output current.
- What is the temperature range of the LMP8480?
The operating temperature range is from –40°C to 125°C.
- What package type is the LMP8480 available in?
The LMP8480 is available in an 8-pin VSSOP package.
- Can the LMP8480 be used for bidirectional current sensing?
No, the LMP8480 is designed for unidirectional current sensing. For bidirectional sensing, the LMP8481 should be used.
- What are some common applications of the LMP8480?
Common applications include high-side current sense, vehicle current measurement, telecommunications, motor controls, laser or LED drivers, energy management, and solar panel monitoring.
- How does the LMP8480 handle high common-mode voltages?
The LMP8480 can handle common-mode input voltages from 4.0 V to 76 V, making it suitable for high common-mode voltage environments.
