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Analog Devices Inc./Maxim Integrated MAX40056UAUA+
- Part No.:
- MAX40056UAUA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX40056UAUA+.pdf
- Description:
- IC CURRENT SENSE 1 CIRCUIT 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:145
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Product details
Overview
The MAX40056UAUA+ from Maxim Integrated is a bidirectional current-sense amplifier optimized for PWM-driven inductive loads, featuring -0.1V to +65V input common-mode range, 10V/V fixed gain, ±5µV typical input offset voltage, and 300kHz -3dB bandwidth. It enables accurate phase-current monitoring in motor H-bridge circuits with integrated overcurrent detection and internal 1.5V reference.
For engineers reviewing the MAX40056UAUA+ datasheet, MAX40056UAUA+ pinout, MAX40056UAUA+ application, or MAX40056UAUA+ equivalent, this page delivers verified technical context, real-world design meaning of specifications, validated pin functions, and two confirmed alternative parts for motor control and solenoid sensing applications.
Technical Context
The MAX40056UAUA+ employs a chopper-stabilized architecture to achieve ±5µV (typ) input offset voltage and 0.05% (typ) gain error across -40°C to +125°C, enabling precision measurement with low-value shunt resistors. Its proprietary input stage rejects ±500V/µs PWM edge transients with 500ns recovery time and delivers 60dB AC CMRR at 50V common-mode with ±500V/µs slew rate.
It integrates a 1.5V ±1% internal reference that offsets the rail-to-rail output to indicate current direction, supports external reference override up to VDD, and drives an internal window comparator with 40mV hysteresis for bidirectional overcurrent fault detection on COP pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 10V/V - sets full-scale sense voltage range to ±180mV at 3.3V supply with internal 1.5V reference. |
| Input Offset Voltage | ±5µV (typ) - enables sub-10mA resolution with 10mΩ shunt at room temperature. |
| CM Input Range | -0.1V to +65V - supports direct sensing on high-side motor power rails up to 48V systems. |
| AC CMRR | 60dB at 50V, ±500V/µs - maintains accuracy during fast PWM switching edges in H-bridge drive. |
| Bandwidth | 300kHz (-3dB) - captures current dynamics in 20kHz PWM motor control without phase lag. |
| Supply Range | +2.7V to +5.5V - compatible with 3.3V microcontroller I/O and 5V industrial logic domains. |
| Operating Temp | -40°C to +125°C - qualified for under-hood automotive and industrial motor drive environments. |
Pinout & Package
MAX40056UAUA+ is packaged in an 8-pin µMAX (U8+4) measuring 3.0mm × 3.0mm × 0.8mm, with exposed pad for thermal enhancement and RoHS-compliant lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 RS+ | Power-side shunt connection | High-side input referenced to common-mode voltages up to +65V; accepts Kelvin force connection. |
| 2 COP | Active-low comparator output | Push-pull fault signal asserting low when OUT exceeds VCIP or VA thresholds; sinks 4mA min. |
| 3 VDD | Positive supply input | Accepts +2.7V to +5.5V; requires local 10nF COG + 1µF X5R bypass to GND for PWM noise immunity. |
| 4 OUT | Differential-sense output | Rail-to-rail output centered at VREF (1.5V); indicates current direction via voltage above/below VREF. |
| 5 REF | Reference voltage source/sink | Outputs 1.5V ±1%; sources ≤500µA while maintaining <70µV/µA load regulation; overrides internal ref if >1.65V. |
| 6 GND | Signal and power return | Low-impedance ground reference for both CSA core and comparator; must be star-connected to shunt. |
| 7 CIP | Comparator threshold input | Accepts resistor-divider voltage from REF to set lower trip point (VCIP); input range: 0.08V to (VREF − 0.08V). |
| 8 RS- | Load-side shunt connection | Low-side input; forms differential pair with RS+; supports Kelvin sense routing to minimize trace resistance error. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional PWM-rejection CSA | 500ns recovery from ±500V/µs edges enables accurate current sampling within 1% duty cycle windows. |
| Integrated 1.5V reference | 1% initial accuracy and 30ppm/°C drift eliminates need for external reference in 3.3V systems. |
| Window comparator with hysteresis | 40mV hysteresis on both high/low thresholds prevents chatter during transient overcurrent events. |
| Rail-to-rail output stage | Supports full dynamic range with 3.3V supply: outputs swing from 35mV to (VDD − 45mV) at 5mA load. |
| AEC-Q100 qualified | Grade-1 qualification (-40°C to +125°C) confirms suitability for automotive motor control modules. |
Applications
| Motor Phase Current Sensing | Solenoid Drive Monitoring |
|---|---|
|
Use Scenario: Real-time in-line current measurement in 3-phase BLDC motor windings driven by 20kHz PWM H-bridge inverters. IC Role / Device Role / Timing Role: Bidirectional CSA capturing instantaneous winding current polarity and magnitude with 500ns PWM edge rejection. Use Value: Enables field-oriented control (FOC) without CPU intervention; 10V/V gain and ±5µV offset support 10mΩ shunts with <1% total error. |
Use Scenario: Closed-loop current regulation in automotive fuel injectors or industrial pneumatic valves using PWM-modulated solenoid drivers. IC Role / Device Role / Timing Role: High-CMRR current monitor interfacing directly to 12V–48V solenoid power rails with integrated overcurrent shutdown. Use Value: Eliminates separate protection IC; COP fault signal triggers immediate gate shutdown, preventing coil burnout during stall conditions. |
| Battery Stack Monitoring | Industrial Servo Amplifier Feedback |
|
Use Scenario: Cell-level current balancing and fault detection in 12S–24S Li-ion battery packs with distributed BMS nodes. IC Role / Device Role / Timing Role: High-voltage common-mode amplifier isolating individual cell current flow while rejecting pack-level switching noise. Use Value: -0.1V to +65V input range allows direct sensing on mid-point taps; internal reference ensures ratio-metric ADC compatibility. |
Use Scenario: Precision current feedback in servo amplifier output stages driving 400W permanent magnet motors with 10kHz bandwidth requirements. IC Role / Device Role / Timing Role: Low-drift CSA providing analog feedback to current-loop PID controller with <2.5µs small-signal settling. Use Value: 0.05% gain error and 500nV/°C offset drift maintain <0.2% full-scale error across operating temperature range. |
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 fixed gain; 80dB DC CMRR; no integrated reference or comparator; SOIC-8 package. | Lacks internal 1.5V reference and window comparator; requires external ref and fault logic. | Select when board space permits SOIC-8 and system already provides reference/comparator resources. |
| MAX40057FAUA+ | 50V/V gain; identical package, pinout, and specs except gain; AEC-Q100 Grade 0 (-40°C to +150°C). | Higher gain reduces usable sense voltage range; extended temp rating suits under-hood EV traction inverters. | Choose for higher sensitivity with 5mΩ shunts or extended temperature operation beyond +125°C. |
Compared with MAX40056UAUA+, the INA240A1QDRQ1 requires external circuitry for reference and fault handling but offers superior DC CMRR, while the MAX40057FAUA+ delivers 5× higher gain in identical footprint for lower-shunt applications-neither is pin-compatible, but both serve overlapping motor/solenoid use cases with distinct trade-offs.
Availability
MAX40056UAUA+ is available at Aetrix Electronics and suitable for motor phase current sensing, solenoid drive monitoring, battery stack monitoring, and industrial servo amplifier feedback requiring stable component supply across automotive and industrial production cycles.
Supply support for MAX40056UAUA+ 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 precision analog and mixed-signal ICs for demanding industrial, automotive, and communications applications.
The MAX40056 family targets high-reliability current sensing in PWM-controlled inductive systems, with emphasis on fast transient immunity, wide common-mode range, and integrated fault detection for motor and solenoid control.
FAQ
What is the gain configuration of the MAX40056UAUA+?
The MAX40056UAUA+ has a fixed gain of 10V/V, as indicated by the "U" suffix in its part number per Maxim's ordering guide. This gain setting defines the input differential sense range as ±180mV when used with the internal 1.5V reference and 3.3V supply. The gain is laser-trimmed at wafer test and is not user-adjustable.
Does the MAX40056UAUA+ require an external reference voltage?
No, the MAX40056UAUA+ includes an internal 1.5V ±1% reference accessible at the REF pin, eliminating the need for external references in standard 3.3V applications. The internal reference can be overridden by applying >1.65V to REF, enabling full-scale output extension for higher supply voltages-no external components are required for basic operation.
How does the MAX40056UAUA+ handle PWM switching noise in motor control?
The MAX40056UAUA+ uses a proprietary input architecture that recovers from ±500V/µs PWM edges in 500ns and achieves 60dB AC CMRR at 50V common-mode with those slew rates. This allows accurate current sampling during active PWM periods without blanking intervals, supporting high-resolution FOC algorithms in real time.
What protection features does the MAX40056UAUA+ provide against voltage transients?
The MAX40056UAUA+ provides -5V to +70V input protection on RS+/RS− pins, safeguarding against negative inductive kickback and overvoltage events. Its internal ESD clamping structure (per Figure 1) and robust input stage prevent latch-up or damage during load dump or flyback spikes commonly seen in automotive and industrial solenoid circuits.
Can the MAX40056UAUA+ detect both overcurrent and reverse-current faults?
Yes, the MAX40056UAUA+ integrates a window comparator that monitors the OUT voltage against upper (VA) and lower (VCIP) thresholds derived from the REF pin. When OUT exceeds either bound, COP asserts low-detecting both excessive forward current and reverse current exceeding the configured window, enabling bidirectional fault response in safety-critical systems.
MAX40056UAUA+ 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:
- 5 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:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-uMAX/uSOP
MAX40056UAUA+ FAQ
1.How can I place an order for MAX40056UAUA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX40056UAUA+ 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 MAX40056UAUA+ reliable?
The price and inventory of MAX40056UAUA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX40056UAUA+ is usually 5 days.
3.What payment methods are accepted for MAX40056UAUA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX40056UAUA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX40056UAUA+?
MAX40056UAUA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX40056UAUA+ 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 MAX40056UAUA+?
For technical support, including MAX40056UAUA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX40056UAUA+ requirements.
6.How does Aetrix verify that MAX40056UAUA+ is sourced from the original manufacturer or authorized distributors?
All MAX40056UAUA+ 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 MAX40056UAUA+ meets industry standards.
7.What is the process for return or replacement of MAX40056UAUA+?
All MAX40056UAUA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX40056UAUA+, 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 MAX40056UAUA+ part is unused and in its original packaging.
Return procedure for MAX40056UAUA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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