Low offset ac current sensor ic ALLEGRO ACS726LLFTR-20B-T featuring integrated back end amplifier and operation mode
Product Overview
The Allegro ACS726 current sensor IC family offers economical and precise AC current sensing solutions for industrial, commercial, and communications systems. These galvanically isolated sensors feature a fully differential output for superior immunity to offset drift and common mode noise. The integrated back-end amplifier (BEA) allows for externally adjustable gain and bandwidth via RC networks, and can be powered down to reduce consumption. The device's precise, low-offset Hall sensor circuit, coupled with a low-resistance copper conduction path, ensures accurate current measurement with low power loss. Typical applications include motor control, load detection and management, switched-mode power supplies, and overcurrent fault protection. The ACS726 is available in a small, low-profile QSOP24 package, ideal for space-constrained applications.
Product Attributes
- Brand: Allegro
- Package Type: QSOP24 (LF)
- Lead Finish: 100% matte tin
- RoHS Status: Pb-free, excluding flip-chip high-temperature Pb-based solder balls
Technical Specifications
| Characteristic | Symbol | Test Conditions* | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|---|---|
| Common Operating Characteristics (Not including BEA) | ||||||
| Supply Voltage | VCC | 3 | 3.3 | 3.6 | V | |
| Supply Current (BEA Disabled) | ICC | VCC = 3.3 V, no output load | 8 | 14 | 23 mA | |
| Supply Current (BEA Enabled) | ICCTOTAL | VCC = 3.0 V to 3.6 V | 12 | 22 | 40 mA | |
| Primary Conductor Resistance | Rprimary | TA = 25C | 1.1 | m | ||
| Internal Bandwidth | BWi | Small signal 3 dB; TA = 25C, CL = 1 nF | 120 | kHz | ||
| Differential Quiescent Output Voltage | VIOUTdiff(Q) | IP = 0 | 0 | V | ||
| ACS726-20B Operating Characteristics (Not including BEA) | ||||||
| Current Sensing Range | IP | 20 | 20 | A | ||
| Differential Sensitivity | Sensdiff | Across full range of IP, TA = 25C | 98 | 100 | 102 | mV/A |
| Total Output Error | ErrTOT | IP = 20 A, TA = 25C, BWi = 120 kHz | -3 | 1 | 3 | % |
| ACS726-40B Operating Characteristics (Not including BEA) | ||||||
| Current Sensing Range | IP | 40 | 40 | A | ||
| Differential Sensitivity | Sensdiff | Across full range of IP, TA = 25C | 49 | 50 | 51 | mV/A |
| Total Output Error | ErrTOT | IP = 40 A, TA = 25C, BWi = 120 kHz | -2.5 | 1 | 2.5 | % |
| Differential Back End Amplifier (BEA) Operating Characteristics | ||||||
| Closed Loop Gain | GCL(BEA) | 2 | 10 | |||
| Bandwidth | BW(BEA) | GCL(BEA) = 2, CL(BEA) = 1 nF | 1000 | kHz | ||
| Linearity | ErrLin(BEA) | GCL(BEA) = 2, Over 2 V differential dynamic range | % | |||
| Absolute Maximum Ratings | ||||||
| Supply Voltage | VCC | VCC pin | 6 | V | ||
| Electric Strength Test Voltage | VESTV | Between pins 1-12 and 13-24; 60 Hz, 1 minute (Agency Type Test), TA = 25C | 2100 | VAC | ||
| Working Voltage | Vworking | For single protection according to UL 1577 standard | 277 | VAC | ||
| Operating Ambient Temperature | TA | Range L | 40 | 150 | C | |
| Maximum Junction Temperature | TJ(max) | 165 | C | |||
| Storage Temperature | Tstg | 65 | 170 | C | ||
| Thermal Characteristics | ||||||
| Package Thermal Resistance (Junction to Ambient) | RJA | On Allegro ACS726 evaluation board (expected value) | 27 | C/W | ||
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