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Analog Devices Inc./Maxim Integrated MAX44285FAUA+T
- Part No.:
- MAX44285FAUA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX44285FAUA+T.pdf
- Description:
- IC CURRENT SENSE 2 CIRCUIT 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:4,968
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Product details
Overview
MAX44285FAUA+T from Maxim Integrated is a dual-channel, high-precision, high-voltage current-sense amplifier with 50V/V fixed gain, ±12μV max input offset voltage, 0.1% max gain error, and 2.7V to 76V input common-mode range - designed for high-side sensing in server backplanes and industrial power management systems.
For engineers reviewing the MAX44285FAUA+T datasheet, MAX44285FAUA+T pinout, MAX44285FAUA+T application, or MAX44285FAUA+T equivalent, this page delivers verified specifications, package mapping, real-world use cases, and validated alternative options for precision current monitoring in high-voltage, multichannel data acquisition systems.
Technical Context
The MAX44285FAUA+T implements a high-voltage, current-mirror-based architecture that enables accurate high-side sensing independent of VDD. Its internal p-channel FET and matched resistor network (RG11/RG12 = 10kΩ, R01 = 25kΩ, RF1 = 475kΩ) deliver precise 50V/V gain without external components.
It supports simultaneous dual-channel operation with 80kHz small-signal bandwidth and maintains CMRR ≥125dB across its full 2.7V–76V common-mode range, enabling reliable interfacing with SAR ADCs in multiplexed systems operating from -40°C to +125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 50V/V - fixed, factory-set ratio enabling direct 50× amplification of sense voltage without external resistors |
| Input Offset Voltage | ±12μV (max) - ensures sub-1mV error at 20mΩ sense resistor, critical for low-current accuracy |
| Gain Error | 0.1% (max) - guarantees ≤0.5mV output deviation at 1V full-scale, supporting 12-bit+ system resolution |
| Input Common-Mode Range | 2.7V to 76V - allows monitoring battery discharge down to 2.7V and telecom power rails up to 76V |
| Small-Signal Bandwidth | 80kHz - supports fast transient detection in switching power supplies and motor control feedback loops |
| Supply Voltage | 2.7V to 5.5V - compatible with standard 3.3V and 5V logic rails while isolating high-voltage sensing path |
| Operating Temperature | -40°C to +125°C - qualified for under-hood automotive, industrial PLC, and telecom base station environments |
Pinout & Package
MAX44285FAUA+T is housed in an 8-pin µMAX package (outline 21-0036), measuring 3mm × 3mm × 0.95mm, with exposed pad for thermal enhancement and RoHS-compliant lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RS1+ | Channel 1 high-side sense input | Connects to power-rail side of RSENSE1; withstands up to +80V transient relative to GND |
| RS1- | Channel 1 low-side sense input | Connects to load side of RSENSE1; forms differential input pair with RS1+, rejecting common-mode noise |
| RS2+ | Channel 2 high-side sense input | Independent second channel input; enables concurrent monitoring of two power domains |
| RS2- | Channel 2 low-side sense input | Differential partner to RS2+; shares same 76V common-mode tolerance and 80kHz bandwidth |
| VDD | Positive supply rail | Powers internal amplifiers and bias circuitry; decoupling required within 1cm of pin |
| GND | Analog ground reference | Return path for all internal currents; must be separated from noisy digital ground per layout guidelines |
| OUT1 | Channel 1 amplified output | Single-ended 50× scaled replica of VSENSE1; drives ADC inputs directly with <15mV VOL at 500µA sink |
| OUT2 | Channel 2 amplified output | Independent output with identical gain, offset, and drive capability as OUT1 |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent channels | Enables simultaneous monitoring of two high-voltage rails (e.g., +48V and +12V) without cross-talk or shared error sources |
| Matched internal resistor network | RG11 = RG12 = RG21 = RG22 = 10kΩ and R01 = R02 = 25kΩ ensure channel-to-channel gain matching ≤0.05% |
| High CMRR ≥125dB | Maintains accuracy despite large common-mode transients on telecom or server power buses |
| Low THD (63dB) | Preserves signal fidelity for AC-coupled current waveforms up to 1kHz, supporting motor phase current analysis |
| Capacitive load stability | Drives up to 20nF with 250Ω isolation resistor - compatible with typical ADC input filtering networks |
Applications
| Server Backplane Monitoring | Industrial Motor Drive Feedback |
|---|---|
Use Scenario: Real-time current monitoring of redundant 48V/12V power distribution rails in rack-mounted servers. IC Role / Device Role / Timing Role: High-side current-sense amplifier converting mV-level shunt voltage into clean, amplified analog signals for ADC sampling. Use Value: Enables dynamic load balancing and overcurrent shutdown with <1mV total error budget, leveraging ±12μV VOS and 0.1% gain accuracy. | Use Scenario: Closed-loop phase current sensing in three-phase inverters for HVAC compressors and pumps. IC Role / Device Role / Timing Role: Dual-channel analog front-end providing synchronized current feedback for PWM-driven IGBT gate drivers. Use Value: 80kHz bandwidth supports 20kHz PWM carrier frequency with <2µs transient recovery, ensuring stable torque control. |
| Telecom Base Station PA Bias | Industrial PLC Power Module |
Use Scenario: Monitoring bias current of RF power amplifiers operating at 50V–60V drain voltages in macrocell base stations. IC Role / Device Role / Timing Role: High-voltage sense interface isolating sensitive ADC inputs from RF power domain while maintaining DC accuracy. Use Value: 76V common-mode range accommodates full PA voltage swing; low 1300µA supply current minimizes thermal impact on RF section. | Use Scenario: Input current supervision for modular 24V/48V DC power supplies in programmable logic controllers. IC Role / Device Role / Timing Role: Dual-channel fault detector feeding analog watchdog circuits and microcontroller ADCs. Use Value: -40°C to +125°C operation ensures reliability in uncooled control cabinets; GND-referenced outputs simplify MCU interface design. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage, dual-channel current-sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A2IDR | Single-channel, 20V/V gain, 50kHz bandwidth, ±20μV VOS, SOIC-8 package | Requires two devices for dual-channel use; lower bandwidth limits high-frequency transient capture | Select when cost-per-channel is prioritized over integration and bandwidth |
| MAX40056ATA+T | Dual-channel, 20V/V gain, 1MHz bandwidth, ±50μV VOS, 8-TDFN package | Higher bandwidth but higher offset reduces low-current accuracy; not rated for >60V common-mode | Select when fast transient response is critical and common-mode stays below 60V |
Compared with MAX44285FAUA+T, INA240A2IDR offers lower unit cost but requires duplication and sacrifices bandwidth and offset performance; MAX40056ATA+T provides superior speed but trades off precision and high-voltage robustness - making MAX44285FAUA+T optimal for 76V, dual-channel, sub-12μV applications.
Availability
MAX44285FAUA+T is available at Aetrix Electronics and suitable for server backplane monitoring, industrial motor drive feedback, and telecom base station PA bias applications requiring stable component supply, long-term lifecycle support, and guaranteed RoHS compliance.
Supply support for MAX44285FAUA+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 demanding industrial, communications, and computing applications.
The MAX44285 product line delivers high-accuracy, high-voltage current sensing for multichannel data acquisition systems where traditional op-amp solutions fail due to limited common-mode range or insufficient gain stability.
FAQ
What is the exact gain configuration of MAX44285FAUA+T?
The MAX44285FAUA+T is factory-configured for 50V/V fixed gain, as indicated by the "F" suffix in the part number. This gain is achieved via internal laser-trimmed resistors (RG = 10kΩ, R0 = 25kΩ, RF = 475kΩ) and requires no external components. It supports full-scale sense voltages of 50mV, delivering 2.5V output at VDD = 5V - ideal for direct interfacing with 12-bit SAR ADCs.
Does MAX44285FAUA+T support true high-side sensing above the supply voltage?
Yes, MAX44285FAUA+T supports true high-side sensing with input common-mode voltage up to 76V - fully independent of its 2.7V–5.5V VDD supply. This allows it to monitor current in 48V or 60V power rails while powered from a separate 3.3V system rail, eliminating ground-loop interference and preserving load ground integrity - a key requirement in server and telecom applications.
What package type and footprint does MAX44285FAUA+T use?
MAX44285FAUA+T uses the 8-pin µMAX package (outline 21-0036), a 3mm × 3mm surface-mount package with gull-wing leads and an exposed thermal pad. It shares footprint compatibility with other µMAX current-sense amplifiers like MAX4080 and MAX4372, simplifying board reuse. Land pattern number 90-0092 applies, and the "+T" suffix denotes tape-and-reel packaging for automated assembly.
How does MAX44285FAUA+T achieve its low input offset voltage?
MAX44285FAUA+T achieves ±12μV max input offset voltage through a combination of BiCMOS process optimization, laser-trimmed internal resistor matching, and chopper-stabilized input stage design. The offset is guaranteed over temperature (-40°C to +125°C) and exhibits only ±25μV max drift across the full range, enabling accurate low-current measurement even at milliohm-level sense resistors without calibration.
Can MAX44285FAUA+T drive an ADC input directly without external buffering?
Yes, MAX44285FAUA+T can drive SAR ADC inputs directly: its 0.1mΩ output resistance, 15mV max VOL at 500µA sink, and 20nF capacitive load stability (with 250Ω series resistor) meet typical ADC input requirements. For 14-bit systems, its 2µs transient recovery time ensures full settling before sample-and-hold activation - eliminating need for external op-amp buffers in most multichannel DAQ designs.
MAX44285FAUA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Current Sense
- Number of Circuits:
- 2
- Output Type:
- -
- Slew Rate:
- -
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 80 kHz
- Current - Input Bias:
- 65 µA
- Voltage - Input Offset:
- 12 µV
- Current - Supply:
- -
- Current - Output / Channel:
- -
- 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
MAX44285FAUA+T FAQ
1.How can I place an order for MAX44285FAUA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX44285FAUA+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 MAX44285FAUA+T reliable?
The price and inventory of MAX44285FAUA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX44285FAUA+T is usually 5 days.
3.What payment methods are accepted for MAX44285FAUA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX44285FAUA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX44285FAUA+T?
MAX44285FAUA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX44285FAUA+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 MAX44285FAUA+T?
For technical support, including MAX44285FAUA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX44285FAUA+T requirements.
6.How does Aetrix verify that MAX44285FAUA+T is sourced from the original manufacturer or authorized distributors?
All MAX44285FAUA+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 MAX44285FAUA+T meets industry standards.
7.What is the process for return or replacement of MAX44285FAUA+T?
All MAX44285FAUA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX44285FAUA+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 MAX44285FAUA+T part is unused and in its original packaging.
Return procedure for MAX44285FAUA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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