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 | <0.1 | % | ||
| 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 | ||
2106080105_ALLEGRO-ACS726LLFTR-20B-T_C2654897.pdf
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