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Analog Devices Inc./Maxim Integrated MAX44285FAUA+
- Part No.:
- MAX44285FAUA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX44285FAUA+.pdf
- Description:
- IC CURRENT SENSE 2 CIRCUIT 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:1,367
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Product details
Overview
MAX44285FAUA+ 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–76V input common-mode range - designed for accurate high-side current monitoring in multichannel power systems such as server backplanes and base station power amplifiers.
For engineers reviewing the MAX44285FAUA+ datasheet, MAX44285FAUA+ pinout, MAX44285FAUA+ application, or MAX44285FAUA+ equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated pin functions, application-specific implementation insights, and two confirmed alternative parts with documented functional and packaging differences.
Technical Context
The MAX44285FAUA+ uses a high-voltage BiCMOS architecture to achieve rail-to-rail input common-mode operation up to 76V independent of its 2.7V–5.5V supply, enabling direct sensing on battery-powered or telecom power rails. Its dual-channel topology isolates measurement paths while sharing VDD and GND.
Each channel implements a precision current-mirror-based gain stage with internal matched resistors (RG11/RG12 = 10kΩ, R01 = 25kΩ, RF1 = 475kΩ), delivering exact 50V/V gain without external components. Output transient recovery time is 2µs with 14-bit ADC settling, supporting multiplexed data acquisition at ≤80kHz bandwidth.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 50V/V - precisely scales 50mV full-scale sense voltage to 2.5V output, matching 12-bit SAR ADC reference ranges. |
| Input Offset Voltage | ±12µV max at +25°C - enables accurate sub-1A current sensing with 50mΩ shunt at 50mV full scale. |
| Gain Error | 0.1% max at +25°C - ensures <±1.25mV absolute output error over full-scale 2.5V output. |
| Common-Mode Range | 2.7V to 76V - supports direct sensing on 48V telecom, 54V PoE++, and 60V GaN power amplifier rails. |
| Small-Signal Bandwidth | 80kHz - sufficient for dynamic load monitoring in server VRMs and base station PA bias control loops. |
| Supply Current | 1.5mA max over -40°C to +125°C - enables low-power always-on current monitoring in thermal-critical modules. |
| CMRR | 125dB min - rejects >99.99997% of common-mode noise from noisy 48V/76V bus transients. |
Pinout & Package
MAX44285FAUA+ is housed in an 8-pin µMAX package (package code U8+1, outline 21-0036), measuring 3.0mm × 3.0mm × 1.1mm with exposed pad for thermal enhancement. Pin 5 is GND, pin 8 is VDD, pins 1–4 are differential sense inputs (RS1+, RS1−, RS2+, RS2−), and pins 6–7 are buffered outputs (OUT2, OUT1).
| 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 Kelvin pair with RS1+ to reject trace IR errors. |
| RS2+ | Channel 2 high-side sense input | Independent high-voltage input for second current path; shares same 76V CMR and gain accuracy. |
| RS2− | Channel 2 low-side sense input | Completes second Kelvin sense loop; enables simultaneous dual-rail monitoring without crosstalk. |
| VDD | Positive supply | 2.7V–5.5V logic-compatible supply; powers internal op amps and bias circuitry only - no HV path. |
| GND | Analog ground reference | Single-point return for all analog circuitry; must be isolated from power ground to avoid noise coupling. |
| OUT1 | Channel 1 amplified output | Rail-to-rail output driving 400Ω + 1nF ADC input; VOL = 15mV @ 500µA sink ensures clean LSB resolution. |
| OUT2 | Channel 2 amplified output | Identical performance to OUT1; allows time-aligned sampling of two independent loads via single ADC MUX. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent high-side channels | Enables concurrent monitoring of primary and backup power rails or redundant load paths without shared error sources. |
| 50V/V fixed gain (MAX44285F variant) | Eliminates external gain-setting resistors; guarantees 50mV full-scale input → 2.5V output for 12-bit ADC compatibility. |
| 12μV max input offset voltage | Reduces minimum resolvable current by 2× vs. 25μV competitors - critical for low-power standby current detection. |
| 80kHz small-signal bandwidth | Supports closed-loop response in digital power supplies with ≤10µs control loop periods. |
| −40°C to +125°C operating range | Validated for under-hood automotive junction-box modules and industrial motor drive cabinets without derating. |
Applications
| Base Station Power Amplifier Monitoring | Server Backplane Current Guarding |
|---|---|
Use Scenario: Real-time current monitoring of GaN HEMT power amplifier bias rails operating at 48V–60V in 5G macro base stations. IC Role / Device Role / Timing Role: High-side current-sense amplifier converting mV-level shunt voltage to clean 2.5V-ranged ADC input with 80kHz bandwidth. Use Value: Enables precise PA efficiency optimization and fault detection before thermal runaway, leveraging ±12µV offset to resolve <100mA changes on 50mΩ shunts. |
Use Scenario: Dual-rail current supervision on 12V and 48V server backplane power distribution networks with hot-swap controllers. IC Role / Device Role / Timing Role: Dual-channel high-voltage sense amplifier feeding multiplexed SAR ADC for per-rail telemetry and OCP triggering. Use Value: Simultaneous measurement eliminates timing skew between rails; 0.1% gain error ensures accurate power budgeting across 100A+ loads. |
| Industrial PLC Power Module Protection | Telecom DC Power Shelf Management |
Use Scenario: Overcurrent detection in programmable logic controller (PLC) power modules supplying 24V/48V I/O cards with fast transient immunity. IC Role / Device Role / Timing Role: High-CMRR current sensor rejecting common-mode noise from nearby 20A switching loads during 10ms fault response. Use Value: 125dB CMRR prevents false trips from bus transients; saturation recovery time of 10µs enables rapid fault clearance and restart. |
Use Scenario: Distributed current sensing across multiple 54V PoE++ power shelves feeding edge AI accelerators and wireless access points. IC Role / Device Role / Timing Role: Dual-channel monitor interfacing with microcontroller ADC to track per-port current allocation and thermal derating. Use Value: 76V common-mode range covers full PoE++ specification margin; WLP/µMAX package options allow layout flexibility in space-constrained shelf designs. |
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 |
|---|---|---|---|
| INA240A1D | Single-channel, 20V/V gain, 10µV max VOS, 85V CMR, SOIC-8 package | Requires two devices for dual-channel use; higher CMR but no integrated dual-channel matching | Select when absolute lowest offset (<10µV) is required and board area permits duplication. |
| MAX40088AUB+ | Dual-channel, 20V/V gain, 15µV max VOS, 65V CMR, 8-pin µMAX package | Lower CMR (65V vs. 76V); optimized for 3.3V/5V systems with lower supply current (900µA) | Select for cost-sensitive 48V systems where 65V margin suffices and lower quiescent current is prioritized. |
Compared with MAX44285FAUA+, INA240A1D offers superior offset but lacks native dual-channel integration and requires PCB duplication, while MAX40088AUB+ matches the µMAX footprint and dual-channel architecture but trades 11V of common-mode headroom and 30kHz bandwidth for lower power - making MAX44285FAUA+ optimal for 76V telecom and high-dynamic-range server applications.
Availability
MAX44285FAUA+ is available at Aetrix Electronics and suitable for server backplane telemetry, 5G base station PA monitoring, and industrial PLC power module protection requiring stable component supply across extended temperature and high-voltage operating conditions.
Supply support for MAX44285FAUA+ 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-common-mode current sensing for multichannel power systems - specifically engineered to replace discrete op-amp + resistor solutions in telecom infrastructure and high-density server power delivery.
FAQ
What is the exact gain configuration of MAX44285FAUA+?
The MAX44285FAUA+ is the 50V/V gain variant of the MAX44285 family, internally configured with R01 = R02 = 25kΩ, RG11 = RG12 = RG21 = RG22 = 10kΩ, and RF1 = RF2 = 475kΩ. This yields a precise 50V/V transfer function where a 50mV differential input produces a 2.5V output, validated across -40°C to +125°C with 0.1% max gain error at +25°C. The 'F' in MAX44285FAUA+ explicitly denotes the 50V/V option.
Does MAX44285FAUA+ support true high-side sensing above its supply voltage?
Yes, MAX44285FAUA+ supports true high-side sensing with input common-mode voltages up to 76V while operating from a 2.7V–5.5V VDD supply. Its BiCMOS input stage isolates the high-voltage sense inputs (RS1+/RS1−, RS2+/RS2−) from the low-voltage core, enabling direct connection to 48V, 54V, or 60V power rails without level-shifting. Absolute maximum ratings confirm RS+/RS− withstand ±80V transients relative to GND.
What package type and dimensions does MAX44285FAUA+ use?
MAX44285FAUA+ 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. It is distinct from the WLP variant (e.g., MAX44285FAWA+) and features gull-wing leads compatible with standard reflow soldering. The 'U' in FAUA+ denotes µMAX packaging, and the '+' suffix confirms RoHS compliance and lead-free finish.
How does MAX44285FAUA+ achieve its 12μV max input offset voltage?
MAX44285FAUA+ achieves 12μV max input offset voltage through laser-trimmed thin-film resistors and matched BiCMOS input transistor pairs fabricated on Maxim's precision analog process. Offset is guaranteed over temperature (-40°C to +125°C) and specified at ±25μV max across full temperature range. The low 130nV/°C drift ensures minimal offset variation in thermally unstable environments like base station cabinets.
Can MAX44285FAUA+ drive an ADC directly without external buffering?
Yes, MAX44285FAUA+ is designed to drive SAR ADC inputs directly. Its output drives 400Ω + 1nF loads with 2µs transient recovery to 14-bit settling, matching typical ADC sampling capacitor requirements. VOL = 15mV @ 500µA sink and VOH = VDD − 15mV @ 500µA source ensure full dynamic range utilization. No external op-amp buffer is needed for 12-bit or 14-bit converters with ≤1MSPS sampling rates.
MAX44285FAUA+ 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:
- 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+ FAQ
1.How can I place an order for MAX44285FAUA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX44285FAUA+ 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+ reliable?
The price and inventory of MAX44285FAUA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX44285FAUA+ is usually 5 days.
3.What payment methods are accepted for MAX44285FAUA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX44285FAUA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX44285FAUA+?
MAX44285FAUA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX44285FAUA+ 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+?
For technical support, including MAX44285FAUA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX44285FAUA+ requirements.
6.How does Aetrix verify that MAX44285FAUA+ is sourced from the original manufacturer or authorized distributors?
All MAX44285FAUA+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX44285FAUA+?
All MAX44285FAUA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX44285FAUA+, 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+ part is unused and in its original packaging.
Return procedure for MAX44285FAUA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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