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Analog Devices Inc./Maxim Integrated MAX40056UAWA+T
- Part No.:
- MAX40056UAWA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-WFBGA, WLBGA
- Datasheet:
-
MAX40056UAWA+T.pdf
- Description:
- CURRENT-SENSE AMPLIFIER W / PWM
- Quantity:
- Payment:
- Shipping:
Inventory:2,007
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Product details
Overview
The MAX40056UAWA+T 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 bandwidth. It enables accurate phase-current monitoring in motor windings and solenoids with integrated 1.5V reference and overcurrent comparator.
For engineers reviewing the MAX40056UAWA+T datasheet, MAX40056UAWA+T pinout, MAX40056UAWA+T application, or MAX40056UAWA+T equivalent, key selection criteria include PWM edge recovery time (500ns), AC CMRR at ±500V/µs (60dB), rail-to-rail output swing, internal reference sourcing capability, and AEC-Q100 qualification for automotive-grade reliability.
Technical Context
The MAX40056UAWA+T implements a chopper-stabilized architecture to achieve ±5µV (typ) input offset voltage and <0.05% (typ) gain error across -40°C to +125°C, enabling high-accuracy current measurement with low-value sense resistors. Its proprietary input stage rejects fast PWM edges up to ±500V/µs without saturation or settling delay.
It integrates a window comparator with user-configurable thresholds via the CIP pin and a 1.5V internal reference that offsets the OUT pin to indicate current direction. The REF pin sources current to external loads while maintaining 30µV/µA load regulation, eliminating noisy PCB routing of reference signals.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 10V/V - sets full-scale output swing proportional to sense resistor voltage drop; enables ±180mV differential input range with 3.3V supply and internal 1.5V reference. |
| Input Offset Voltage | ±5µV (typ) - ensures sub-millivolt measurement accuracy even with 1mΩ sense resistors, minimizing system-level current error. |
| Bandwidth | 300kHz (-3dB) - supports real-time current capture in high-frequency PWM motor control (e.g., >20kHz switching). |
| PWM Edge Recovery | 500ns - guarantees output stability within one half-cycle of 2MHz PWM edges, critical for in-phase winding current sampling. |
| Common-Mode Range | -0.1V to +65V - allows direct sensing on high-side or low-side of 48V industrial/motor drives without level-shifting circuitry. |
| Supply Voltage | +2.7V to +5.5V - compatible with standard 3.3V and 5V logic rails; internal reference remains stable across full range. |
| Operating Temperature | -40°C to +125°C - qualified per AEC-Q100 Grade 0, suitable for under-hood automotive and industrial motor control environments. |
Pinout & Package
MAX40056UAWA+T is housed in an 8-bump wafer-level package (WLP), measuring 2.02mm × 1.4mm, with solder bumps arranged in a 2×4 array. This ultra-compact, bottom-terminated package supports high-density PCB layouts and thermal performance with θJA = 74.65°C/W (four-layer board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RS+ | Power-side sense resistor connection | High-impedance input accepting common-mode voltages up to +65V; designed for Kelvin connection to minimize trace resistance error. |
| RS- | Load-side sense resistor connection | Differential complement to RS+; forms precision current-sense node with ±2V max differential input range. |
| VDD | Positive supply input | Accepts +2.7V to +5.5V; requires local 10nF COG/NPO + 1µF X5R bypass to GND for stable operation during PWM transients. |
| GND | Signal and power return | Low-impedance ground reference shared by amplifier, comparator, and reference; must be routed separately from power ground. |
| OUT | Current-sense amplifier output | Rail-to-rail output referenced to VREF; voltage above VREF indicates positive current flow (RS+ → RS-), below indicates reverse flow. |
| REF | Internal 1.5V reference output | Sources current to external loads (≤500µA); used to bias OUT and define comparator thresholds; can be overridden by external >1.65V reference. |
| COP | Active-low comparator push-pull output | Asserts low when OUT exceeds upper threshold (VA) or falls below lower threshold (VCIP); drives microcontroller interrupt directly. |
| CIP | Comparator input / threshold control | Accepts externally derived voltage (e.g., resistor divider from REF) to set lower fault threshold; defines window hysteresis with VA = 2×VREF − VCIP. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional current sensing | Output centered at VREF (1.5V) enables unambiguous detection of forward/reverse current direction without external level-shifting. |
| Integrated window comparator | Single-pin CIP configuration sets both overcurrent and undercurrent fault thresholds; COP provides immediate digital fault flag with built-in hysteresis. |
| PWM-rejection architecture | Withstands ±500V/µs common-mode dV/dt without distortion or recovery delay, eliminating need for external RC filtering in H-bridge applications. |
| Chopper-stabilized core | Delivers ±5µV (typ) input offset and <0.5µV/°C drift, enabling stable 12-bit+ current measurements across automotive temperature range. |
| AEC-Q100 qualified | Grade 0 (−40°C to +125°C) qualification confirms suitability for safety-critical automotive subsystems including EPS, HVAC blowers, and seat motors. |
Applications
| Motor Phase Current Monitoring | Solenoid Drive Protection |
|---|---|
|
Use Scenario: Real-time in-line current sampling of each winding in a 3-phase BLDC servo motor driven by 20–100kHz PWM. IC Role / Device Role / Timing Role: Bidirectional CSA providing synchronized analog output for ADC conversion; COP pin triggers MCU fault handling within 14µs propagation delay. Use Value: Enables field-oriented control (FOC) with <1% current measurement error across full torque range, supporting precise torque ripple suppression. |
Use Scenario: Monitoring coil current during energization/de-energization cycles in automotive fuel injectors or transmission solenoids. IC Role / Device Role / Timing Role: High-CMRR amplifier rejecting inductive kickback spikes up to -5V; internal comparator detects stall or short-circuit faults. Use Value: Prevents coil overheating by triggering immediate PWM shutdown upon overcurrent, extending solenoid lifetime and meeting ISO 16750-2 surge immunity. |
| Battery Stack Cell Balancing | Industrial H-Bridge Motor Control |
|
Use Scenario: Measuring charge/discharge current in 12–48V Li-ion battery packs with active balancing circuits. IC Role / Device Role / Timing Role: Low-offset CSA interfacing with isolated sigma-delta ADC; REF pin supplies reference to ADC for ratiometric accuracy. Use Value: Achieves ±0.5% current measurement accuracy over full SOC and temperature range, improving state-of-charge estimation and thermal management. |
Use Scenario: High-side current sensing in 24–48V industrial conveyor or pump motor drives using discrete IGBT half-bridges. IC Role / Device Role / Timing Role: Direct connection to shunt resistor on high-side leg; withstands 65V common-mode while rejecting gate-drive crosstalk. Use Value: Eliminates need for isolated amplifiers or optocouplers, reducing BOM cost and PCB area while maintaining functional safety compliance. |
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, 80kHz bandwidth, 120dB DC CMRR, no integrated comparator, SOIC-8 package. | Lacks window comparator and PWM-edge recovery optimization; requires external fault logic and reference buffering. | Select when lower bandwidth suffices and comparator functionality is implemented elsewhere; preferred for cost-sensitive non-automotive designs. |
| ACS724LLCTR-10AU-T | 10A integrated Hall-effect sensor, 1.2mV/A sensitivity, 120kHz bandwidth, ratiometric output, SOIC-8. | Galvanically isolated but lower accuracy (±1.5% total error), no high-CMRR rejection, limited to unidirectional or dual-output variants. | Choose for isolation-critical applications where ±1% current accuracy is acceptable and PWM rejection is less demanding. |
Compared with INA240A1QDRQ1 and ACS724LLCTR-10AU-T, the MAX40056UAWA+T delivers superior PWM-edge resilience (500ns recovery vs. >1µs), tighter offset (±5µV vs. ±20µV), and integrated fault signaling-making it optimal for high-dynamic motor control where timing-critical protection is mandatory.
Availability
MAX40056UAWA+T is available at Aetrix Electronics and suitable for automotive motor control, industrial actuator monitoring, and battery management systems requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant performance.
Supply support for MAX40056UAWA+T 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, mixed-signal, and power management ICs for automotive, industrial, and communications markets.
The MAX40056 family was developed specifically for high-accuracy, high-CMRR current sensing in PWM-controlled inductive loads-addressing challenges in electric power steering, HVAC actuators, and servo motor drives.
FAQ
What is the gain configuration of the MAX40056UAWA+T?
The MAX40056UAWA+T has a fixed 10V/V gain, as indicated by the "U" suffix in the part number. This gain setting enables ±180mV full-scale differential input range when paired with the internal 1.5V reference and 3.3V supply. Gain is laser-trimmed at wafer test and does not require external components.
Does the MAX40056UAWA+T require external components for basic operation?
Yes - the MAX40056UAWA+T requires a 10nF COG/NPO and 1µF X5R capacitor between VDD and GND for supply decoupling, plus 10nF and 1µF capacitors from REF to GND. For comparator use, a resistor divider from REF to CIP sets the lower fault threshold. No gain-setting resistors are needed due to its fixed 10V/V architecture.
Can the internal 1.5V reference of the MAX40056UAWA+T be overridden?
Yes - applying a voltage ≥1.65V to the REF pin overrides the internal 1.5V reference. The device automatically selects the higher voltage, allowing full-scale output swing extension (e.g., 2.5V reference with 5V supply yields ±250mV input range). The internal reference remains active as a backup if the external source fails.
How does the MAX40056UAWA+T handle negative inductive kickback?
The MAX40056UAWA+T features robust input protection rated to -5V on RS+/RS-, preventing damage during inductive turn-off events. Its input stage maintains functionality and signal integrity across the full -5V to +70V protected range, unlike standard CSAs that may latch up or saturate under negative transients.
Is the MAX40056UAWA+T pin-compatible with other MAX40056 variants?
No - all MAX40056 variants (F/T/U) share identical pinout and package footprint, but differ only in factory-trimmed gain (50V/V, 20V/V, 10V/V). The MAX40056UAWA+T is mechanically and electrically pin-compatible with MAX40056FAUA+ and MAX40056TAUA+, enabling design reuse across current-sense ranges.
MAX40056UAWA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-WFBGA, WLBGA
- Packaging:
- Tape & Reel (TR)
- 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:
- 20 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:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-WLP (2.02x1.4)
MAX40056UAWA+T FAQ
1.How can I place an order for MAX40056UAWA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX40056UAWA+T 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 MAX40056UAWA+T reliable?
The price and inventory of MAX40056UAWA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX40056UAWA+T is usually 5 days.
3.What payment methods are accepted for MAX40056UAWA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX40056UAWA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX40056UAWA+T?
MAX40056UAWA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX40056UAWA+T 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 MAX40056UAWA+T?
For technical support, including MAX40056UAWA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX40056UAWA+T requirements.
6.How does Aetrix verify that MAX40056UAWA+T is sourced from the original manufacturer or authorized distributors?
All MAX40056UAWA+T 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 MAX40056UAWA+T meets industry standards.
7.What is the process for return or replacement of MAX40056UAWA+T?
All MAX40056UAWA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX40056UAWA+T, 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 MAX40056UAWA+T part is unused and in its original packaging.
Return procedure for MAX40056UAWA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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