ACS72981LLR

Part: ACS72981 family (ACS72981xLR) — Allegro MicroSystems

Type: Linear Hall-Effect Current Sensor IC

Description: Automotive-qualified (AEC-Q100) Hall-effect current sensor IC with a 250 kHz analog output, <2 μs response time, 200 μΩ typical primary conductor resistance, and 3.3 V or 5 V supply operation, in a 7-pin PSOF package.

Operating Conditions:

• Supply voltage: 4.5–5.5 V (5 V variants); 3.0–3.6 V (3.3 V variants)
• Operating temperature: -40 to 85 °C (suffix-dependent: Range E -40 to 85 °C, Range K -40 to 125 °C, Range L -40 to 150 °C)
• Current sensing range: ±50 A to ±200 A (bidirectional) or 50 A to 200 A (unidirectional), depending on variant

Absolute Maximum Ratings:

• Max supply voltage (VCC): 6.5 V
• Reverse supply voltage: -0.5 V
• Max output voltage (VIOUT): 6.5 V
• Max output current: 10 mA
• Max continuous current (TA = 25 °C): 120 A
• Max junction temperature: 165 °C
• Storage temperature: -65 to 165 °C

Key Specs:

• Supply current (ICC): 14 mA typ., no load
• Internal bandwidth: 250 kHz typ. (-3 dB, CL = 1 nF)
• Response time: 1.8 μs typ. (TA = 25 °C, CL = 1 nF, 1 V step)
• Primary conductor resistance: 200 μΩ typ. (TA = 25 °C)
• Output slew rate: 0.53 V/μs typ.
• Nonlinearity: ±0.45 % typ., 0.8 % max
• Total output error (050B3/050B5, 25 to 150 °C): ±2.25 % typ., ±3.25 % max
• Electrical offset error (050B3/050B5, 25 to 150 °C): ±3.3 mV typ., ±5 mV max
• Output load: min 4.7 kΩ; max 10 nF capacitance
• Thermal resistance RθJA: 18 °C/W (on Allegro evaluation board ASEK72981)
• Sensitivity (050B5): 40 mV/A typ.; (050B3): 26.4 mV/A typ.

Features:

• AEC-Q100 automotive qualification
• High-bandwidth 250 kHz analog output
• Less than 2 μs output response time
• 3.3 V and 5 V supply operation
• Ultralow power loss from 200 μΩ internal conductor
• Digitally programmed and compensated gain and offset over temperature
• Factory-trimmed for accuracy
• Differential sensing rejects common-mode interfering magnetic fields
• Monolithic Hall IC for high reliability
• Stable zero-amp output offset over temperature and lifetime
• ESD: HBM ±12 kV, CDM ±1 kV

Applications:

• Motor control
• Load detection and management
• Power supply and DC-to-DC converter control
• Inverter control
• Overcurrent fault detection in safety-critical systems

Package:

• 7-pin PSOF (suffix LR)

• AEC-Q100 automotive qualification
• High-bandwidth 250 kHz analog output
• Less than 2 μs output response time
• 3.3 V and 5 V supply operation
• Ultralow power loss: 200 μΩ internal conductor resistance
• Industry-leading noise performance and increased bandwidth through proprietary amplifier and filter design techniques
• Greatly improved total output error through digitally programmed and compensated gain and offset over the full operating temperature range
• Small package size, with easy mounting capability
• Monolithic Hall IC for high reliability
• Output voltage proportional to AC or DC currents
• Factory-trimmed for accuracy
• Extremely stable zero amp output offset voltage over temperature and lifetime

The ACS72981xLR outputs an analog signal, V OUT , that varies linearly with the bidirectional AC or DC primary sampled current, I P , within the range specified.