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Analog Devices Inc./Maxim Integrated MAX40056FAUA/V+
- Part No.:
- MAX40056FAUA/V+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX40056FAUA/V+.pdf
- Description:
- IC CURRENT SENSE 1 CIRCUIT 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:138
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Product details
Overview
The MAX40056FAUA/V+ from Maxim Integrated is a bidirectional current-sense amplifier (CSA) designed for in-phase motor winding current monitoring in PWM-driven H-bridge and 3-phase servo systems. It features -0.1V to +65V input common-mode range, ±500V/µs PWM edge rejection with 500ns recovery, 50V/V fixed gain, 5µV typical input offset voltage, and operates from +2.7V to +5.5V supply across -40°C to +125°C.
For engineers reviewing the MAX40056FAUA/V+ datasheet, MAX40056FAUA/V+ pinout, MAX40056FAUA/V+ application, or MAX40056FAUA/V+ equivalent, this device delivers precision bidirectional sensing with integrated overcurrent window comparator, rail-to-rail output, and internal 1.5V reference - critical for high-reliability motor control, solenoid drive, and battery stack monitoring where fast PWM transients and wide common-mode voltages are present.
Technical Context
The MAX40056FAUA/V+ employs a chopper-stabilized architecture to achieve ±5µV (typ) input offset voltage and <0.05% (typ) gain error over temperature, enabling accurate low-value shunt measurements. Its proprietary input stage withstands -5V to +70V transient immunity while rejecting ±500V/µs PWM edges via differential slew-rate hardening.
It integrates a dual-threshold window comparator with programmable thresholds referenced to either its internal 1.5V reference or an external reference, supporting immediate overcurrent fault detection. The REF pin sources current to drive adjacent ADCs or external comparators, eliminating noisy PCB reference routing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 50V/V - enables ±30mV full-scale input sensing with ±1.5V output swing around 1.5V reference, ideal for low-resistance shunts (e.g., 2mΩ at ±30A). |
| Input Common-Mode Range | -0.1V to +65V - supports direct sensing on high-side, low-side, or in-line configurations in 12V–48V motor/solenoid systems. |
| PWM Edge Recovery | 500ns - ensures clean output settling after ±500V/µs switching transients, preventing false current readings during H-bridge dead-time transitions. |
| DC CMRR | 140dB - suppresses DC common-mode errors from ground shifts or supply ripple, preserving accuracy in noisy industrial environments. |
| AC CMRR @ 50V, ±500V/µs | 60dB - maintains signal integrity under worst-case PWM edge conditions, critical for phase-current reconstruction in servo drives. |
| Supply Voltage Range | +2.7V to +5.5V - compatible with standard 3.3V microcontroller I/O domains and allows operation from single Li-ion or regulated 5V rails. |
| Operating Temperature | -40°C to +125°C - qualified for under-hood automotive, industrial motor drives, and battery management systems requiring extended thermal robustness. |
Pinout & Package
MAX40056FAUA/V+ is housed in an 8-pin µMAX package (package code U8+4), measuring 3.0mm × 3.0mm × 1.1mm, with exposed pad for thermal enhancement. Pin 1 is marked by a dot; pin numbering follows standard counter-clockwise orientation from top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 RS+ | Power-side sense resistor connection | High-side input terminal; accepts up to +65V common-mode; Kelvin connection recommended to avoid trace resistance errors. |
| 2 COP | Active-low comparator push-pull output | Asserts low on overcurrent (OUT < VCIP or OUT > VA); sinks 4mA, sources 2mA; directly interfaces with MCU GPIO or fault latch circuits. |
| 3 VDD | Positive supply input | +2.7V to +5.5V supply; requires local 10nF COG/NPO + 1µF X5R bypass to GND for stable PWM rejection performance. |
| 4 OUT | Current-sense amplifier output | Rail-to-rail output centered at VREF; equation: VOUT = (ISENSE × RSENSE × 50) + VREF; drives 10kΩ load with 20pF capacitance. |
| 5 REF | Reference voltage output/input | Internal 1.5V ±15mV reference (1.485V–1.515V); sources ≤500µA; overridden by external >1.65V reference to extend output swing. |
| 6 GND | Signal and power ground return | Single-point ground connection; must be tied to low-impedance PCB plane; separates analog and digital return paths in mixed-signal layouts. |
| 7 CIP | Comparator threshold input | Accepts external resistor divider from REF to set lower trip threshold (VCIP); input range: 0.08V to min(VREF−0.08V, VDD−1.25V). |
| 8 RS- | Load-side sense resistor connection | Low-side input terminal; differential input with RS+; supports bidirectional current flow; immune to -5V inductive kickback. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional sensing with 1.5V offset reference | Output voltage above 1.5V indicates current flow from RS+ to RS-; below 1.5V indicates reverse flow - enables direction-aware motor commutation without external level-shifting. |
| Integrated window comparator with hysteresis | Simultaneously monitors overcurrent in both directions using one external resistor divider; 40mV hysteresis prevents chatter near trip thresholds in noisy PWM environments. |
| 500ns PWM edge recovery | Guarantees valid output within 500ns after ±500V/µs common-mode transients - eliminates blanking periods required by slower CSAs in high-frequency motor control. |
| Chopper-stabilized input stage | Delivers ±5µV (typ) input offset and <0.5µV/°C drift - enables sub-1% total error over temperature with 10mΩ shunts at 100A peak currents. |
| Rail-to-rail output with 300kHz bandwidth | Supports real-time current waveform capture for field-oriented control (FOC) algorithms; bandwidth sufficient for 10kHz PWM carrier frequencies with minimal phase lag. |
Applications
| PWM H-Bridge Motor Control | Solenoid Actuator Monitoring |
|---|---|
Use Scenario: In-line phase current sensing in 3-phase BLDC or PMSM servo drives using discrete MOSFET H-bridges. IC Role / Device Role / Timing Role: Bidirectional CSA providing instantaneous winding current feedback to FOC controller; synchronizes with PWM gate signals without blanking. Use Value: Enables precise torque control and dynamic braking by resolving current direction and magnitude within 500ns of PWM edge transitions. |
Use Scenario: Real-time current profiling of automotive fuel injectors or industrial pneumatic solenoids driven by 12V–24V PWM. IC Role / Device Role / Timing Role: High-CMRR CSA capturing turn-on/turn-off transients and steady-state current to detect coil degradation or open-circuit faults. Use Value: Detects <10ms coil de-energization failures and <5% resistance drift via 5µV offset stability - improves functional safety compliance (ISO 26262 ASIL-B). |
| Battery Stack Current Monitoring | Industrial DC Motor Drive |
Use Scenario: Bidirectional current measurement across series-connected Li-ion or lead-acid battery cells in UPS or energy storage systems. IC Role / Device Role / Timing Role: High-voltage CSA interfacing with isolated ADCs to monitor charge/discharge cycles while rejecting pack-level common-mode noise. Use Value: Supports ±65V common-mode range and -5V transient immunity - eliminates need for additional isolation or clamping circuitry in multi-cell stacks. |
Use Scenario: Field weakening and overload protection in 48V industrial DC motors with regenerative braking. IC Role / Device Role / Timing Role: CSA feeding current feedback to motor controller while its integrated comparator triggers immediate shutdown on >150% overcurrent events. Use Value: Combines precision sensing and hardware fault response in one IC - reduces BOM count and improves system MTBF versus discrete comparator solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional current-sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A1QDRQ1 | 20V/V gain, 80dB AC CMRR at 100kHz, no integrated comparator, AEC-Q100 Grade 1 only | Lacks window comparator and 500ns PWM recovery; requires external fault logic; better suited for lower-frequency (<50kHz) sensing | Select when cost sensitivity outweighs need for integrated fault detection and ultra-fast PWM rejection. |
| MAX40080FAUA+ | Same 8-pin µMAX package, 100V/V gain, 400ns recovery, but no internal reference or comparator | Higher gain enables smaller shunts but lacks REF/COP pins - requires external reference and comparator for overcurrent signaling | Choose when higher gain is mandatory and board space permits discrete support components. |
Compared with INA240A1QDRQ1 and MAX40080FAUA+, the MAX40056FAUA/V+ uniquely integrates 50V/V gain, 500ns PWM recovery, internal 1.5V reference, and window comparator in one 3mm × 3mm package - reducing design complexity and PCB area for automotive and industrial motor control where fast, self-contained current monitoring is essential.
Availability
MAX40056FAUA/V+ is available at Aetrix Electronics and suitable for automotive motor control, industrial solenoid actuation, and battery energy storage systems requiring stable component supply, AEC-Q100 qualification, and long-term production continuity.
Supply support for MAX40056FAUA/V+ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Maxim Integrated, now part of Analog Devices, designs high-performance analog and mixed-signal ICs for automotive, industrial, communications, and computing markets, with emphasis on signal integrity, power efficiency, and reliability.
The MAX40056 product line targets high-dynamic-range current sensing in PWM-based power conversion systems, specifically engineered to eliminate measurement corruption from fast-switching transients in motor drives and solenoid controllers.
FAQ
What is the gain configuration of the MAX40056FAUA/V+?
The MAX40056FAUA/V+ has a fixed gain of 50V/V, as indicated by the "F" suffix in the part number per Maxim's ordering guide. This gain is laser-trimmed and guaranteed to have ≤0.5% error over -40°C to +125°C. It enables precise measurement of small differential voltages across low-value shunt resistors - for example, ±30mV input yields ±1.5V output swing around the 1.5V reference, supporting ±30A sensing with a 1mΩ shunt. The MAX40056FAUA/V+ does not support gain selection via external resistors or pins.
Does the MAX40056FAUA/V+ require an external reference voltage?
No, the MAX40056FAUA/V+ includes an internal 1.5V ±15mV reference that is fully functional with a 3.3V supply and can source up to 500µA. The REF pin serves as both output and input: it delivers the internal reference by default, but accepts an external reference >1.65V to override it and extend the output voltage swing. This dual-mode capability eliminates the need for external references in most 3.3V systems while allowing flexibility for higher-supply applications - a key feature distinguishing the MAX40056FAUA/V+ from alternatives lacking integrated reference functionality.
How does the integrated window comparator in the MAX40056FAUA/V+ operate?
The MAX40056FAUA/V+ features a hardware window comparator that monitors the OUT pin against two thresholds: a user-defined lower threshold (VCIP) set via an external resistor divider from REF, and an internally generated upper threshold (VA = 2×VREF − VCIP). When OUT falls below VCIP or rises above VA, the COP pin asserts low. Hysteresis of 40mV prevents noise-induced toggling. This fully integrated fault detection eliminates the need for external comparators and associated passive components - simplifying layout and improving response time to overcurrent events in motor windings or solenoids.
Is the MAX40056FAUA/V+ qualified for automotive applications?
Yes, the MAX40056FAUA/V+ is AEC-Q100 qualified for Grade 1 (-40°C to +125°C), as explicitly stated in the "Benefits and Features" section of its datasheet. It meets automotive reliability stress tests including HTOL, TC, and ESD. Its -0.1V to +65V input common-mode range, -5V transient immunity, and operation up to +125°C ambient make it suitable for under-hood motor control modules, electric power steering (EPS), and battery management systems - all requiring robust performance in harsh electromagnetic and thermal environments.
What package type does the MAX40056FAUA/V+ use, and is it RoHS-compliant?
The MAX40056FAUA/V+ uses the 8-pin µMAX package (outline 21-0036, land pattern 90-0092), measuring 3.0mm × 3.0mm × 1.1mm with an exposed thermal pad. The "+" suffix in the part number denotes RoHS-compliant, lead-free packaging per JEDEC J-STD-609. This package offers superior thermal performance (θJA = 206°C/W on four-layer board) compared to SOIC alternatives and is optimized for automated SMT assembly in high-volume automotive and industrial manufacturing.
MAX40056FAUA/V+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- Current Sense
- Number of Circuits:
- 1
- Output Type:
- Push-Pull, Rail-to-Rail
- Slew Rate:
- 1.5V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 300 kHz
- Current - Input Bias:
- 30 µA
- Voltage - Input Offset:
- 20 µV
- Current - Supply:
- 6mA
- Current - Output / Channel:
- 20 mA
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-uMAX/uSOP
MAX40056FAUA/V+ FAQ
1.How can I place an order for MAX40056FAUA/V+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX40056FAUA/V+ on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MAX40056FAUA/V+ reliable?
The price and inventory of MAX40056FAUA/V+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX40056FAUA/V+ is usually 5 days.
3.What payment methods are accepted for MAX40056FAUA/V+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX40056FAUA/V+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX40056FAUA/V+?
MAX40056FAUA/V+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX40056FAUA/V+ order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MAX40056FAUA/V+?
For technical support, including MAX40056FAUA/V+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX40056FAUA/V+ requirements.
6.How does Aetrix verify that MAX40056FAUA/V+ is sourced from the original manufacturer or authorized distributors?
All MAX40056FAUA/V+ products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MAX40056FAUA/V+ meets industry standards.
7.What is the process for return or replacement of MAX40056FAUA/V+?
All MAX40056FAUA/V+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX40056FAUA/V+, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MAX40056FAUA/V+ part is unused and in its original packaging.
Return procedure for MAX40056FAUA/V+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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