Product Overview
The Allegro ACS72981 family of current sensor ICs offers economical and precise solutions for AC or DC current sensing. With a 250 kHz bandwidth, it is ideal for motor control, load detection and management, power supply and DC-to-DC converter control, and inverter control. Its <2 s response time enables overcurrent fault detection in safety-critical applications. The device utilizes a precision, low-offset linear Hall circuit with a proprietary digital temperature compensation technology for improved accuracy over temperature and lifetime. The internal resistance of the primary copper conduction path is 200 typical, ensuring low power loss and high power density. Differential sensing techniques minimize output disturbance from common-mode magnetic fields.
Product Attributes
- Brand: Allegro
- Certifications: AEC-Q100 automotive qualification
- Material: Lead (Pb) free, 100% matte tin plating, no Pb inside package, oxygen-free copper leadframe.
- Package: 7-pin PSOF package (suffix LR)
Technical Specifications
| Specification | Value | Details/Notes |
|---|---|---|
| Product Family | ACS72981 | High-Precision Linear Hall-Effect-Based Current Sensor IC |
| Bandwidth | 250 kHz | Analog output |
| Response Time | < 2 s | Enables overcurrent fault detection |
| Primary Conductor Resistance | 200 (typical) | Low power loss, high power density |
| Supply Voltage Options | 3.3 V and 5 V | Nominal supply voltage |
| Noise Performance | Industry-leading | Through proprietary amplifier and filter design |
| Total Output Error | Greatly improved | Digitally programmed and compensated gain and offset |
| Zero Output Voltage Stability | Extremely stable over temperature and lifetime | Proprietary digital temperature compensation |
| Package | 7-pin PSOF | Suffix LR |
| Absolute Maximum Supply Voltage (VCC) | 6.5 V | |
| Maximum Junction Temperature (TJ(max)) | 165 C | |
| Operating Temperature Ranges | 40 to 150 C (L) | |
| 40 to 125 C (K) | ||
| 40 to 85 C (E) | ||
| Typical Overcurrent Capability (IPOC) | 285 A | TA = 25C, 1 second on time |
| Typical Thermal Resistance (RJA) | 18 C/W | Mounted on Allegro evaluation board |
| ESD Ratings (HBM) | 12 kV | Per AEC-Q100 |
| ESD Ratings (CDM) | 1 kV | Per AEC-Q100 |
| Pin 1 Description | VCC | Device power supply terminal |
| Pin 2 Description | GND | Device ground terminal |
| Pin 3 Description | VIOUT | Analog output signal |
| Pin 4 Description | NC | No connection; connect to GND for optimal ESD performance |
| Pin 5 Description | IP+ | Positive terminal for current being sampled |
| Pin 6 Description | IP | Negative terminal for current being sampled |
| Pin 7 Description | NC | No connection; connect to GND for optimal ESD performance |
| Chopper Stabilization | Yes | Minimizes Hall offset, reduces thermal noise |
| Common Mode Rejection | Virtually eliminates output disturbance from common-mode magnetic fields | Differential sensing techniques |
| Selection Guide - Example Variants | ACS72981LLRATR-050B3 | 50 A, 26.4 mV/A, 3.3 V, 40 to 150 C |
| ACS72981LLRATR-050B5 | 50 A, 40 mV/A, 5 V, 40 to 150 C | |
| ACS72981KLRATR-150B3 | 150 A, 8.8 mV/A, 3.3 V, 40 to 125 C | |
| ACS72981ELRATR-200B3 | 200 A, 6.6 mV/A, 3.3 V, 40 to 85 C | |
| ACS72981ELRATR-200B5 | 200 A, 10 mV/A, 5 V, 40 to 85 C |
2506301206_ALLEGRO-ACS72981KLRATR-150B5_C3685716.pdf
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