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Analog Devices Inc./Maxim Integrated MAX44285HAUA+
- Part No.:
- MAX44285HAUA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX44285HAUA+.pdf
- Description:
- IC CURRENT SENSE 2 CIRCUIT 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:100
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Product details
Overview
MAX44285HAUA+ from Maxim Integrated is a dual-channel, high-precision, high-voltage current-sense amplifier with 100V/V fixed gain, ±12μV (max) input offset voltage, 0.1% (max) gain error at +25°C, and 2.7V to 76V input common-mode range. It enables accurate high-side current monitoring in server backplanes and telecom power amplifiers where supply voltage is lower than sensed rail.
For engineers reviewing the MAX44285HAUA+ datasheet, MAX44285HAUA+ pinout, MAX44285HAUA+ application, or MAX44285HAUA+ equivalent, this page delivers verified pin functions, real-world use cases in multichannel data acquisition, thermal performance data for µMAX package, and validated alternative parts with documented gain and packaging differences.
Technical Context
The MAX44285HAUA+ uses a high-voltage p-channel FET-based current mirror architecture to achieve input common-mode independence from VDD. Its dual-channel design shares internal gain resistors (RG11 = RG12 = RG21 = RG22 = 10kΩ; R01 = R02 = 25kΩ; RF1 = RF2 = 975kΩ), enabling matched channel performance across temperature.
It features 80kHz small-signal bandwidth and 125dB (min) DC CMRR, supporting SAR ADC interfacing with 14-bit settling in 2µs. Output stage drives 400Ω load with 1nF–6nF sampling capacitors while maintaining stability up to 20nF with 250Ω isolation resistor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 100V/V - sets full-scale sense voltage to 25mV for direct interface with 2.5V ADC reference |
| Input Offset Voltage (max) | ±25μV over -40°C to +125°C - ensures ≤0.1% measurement error at 25mV sense voltage |
| Gain Error (max) | 0.5% over full temperature range - guarantees calibrated current reading without per-unit trimming |
| Common-Mode Range | 2.7V to 76V - supports battery monitoring down to 2.7V and telecom PA bias rails up to 60V |
| Supply Voltage | 2.7V to 5.5V - operates from single 3.3V or 5V rail independent of sensed voltage |
| Bandwidth | 80kHz - captures fast transient currents in switching power supplies and motor control loops |
| PSRR | 110dB (min) - rejects supply noise when sharing VDD with digital controllers or ADCs |
Pinout & Package
MAX44285HAUA+ is housed in an 8-pin µMAX package (outline 21-0036) with 0.65mm pitch, 3mm × 3mm body, and exposed pad for thermal dissipation. Junction-to-ambient thermal resistance is 206.3°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RS1+, RS2+ | High-side sense resistor connections | Accept up to +80V absolute voltage; tolerate ±80V differential during transient events |
| RS1-, RS2- | Low-side sense resistor connections | Reference points for differential sense voltage; tied to load side of shunt resistor |
| OUT1, OUT2 | Analog output channels | Rail-to-rail outputs swing within 15mV of GND and VDD–0.015V at 500µA load |
| VDD | Positive supply | 2.7V–5.5V logic-compatible supply; powers internal op amps and bias circuitry |
| GND | Analog ground reference | Return path for all internal currents; must be low-impedance connection to system ground plane |
Key Features
| Feature | Design Value |
|---|---|
| Dual-channel matched gain | 100V/V per channel with <0.01% inter-channel gain mismatch - eliminates need for per-channel calibration in dual-rail systems |
| Ultra-low offset drift | 130nV/°C - maintains sub-0.05% full-scale error across industrial temperature range |
| Capacitive load stability | Stable with up to 20nF load when isolated by 250Ω - simplifies anti-aliasing filter design for ADC front-end |
| Fast saturation recovery | 10µs - recovers from overcurrent events faster than typical 100kHz PWM periods |
| High-voltage transient tolerance | ±80V RS+–RS− for 1s - withstands surge events in 48V telecom and industrial bus systems |
Applications
| Base Station Power Amplifier Monitoring | Server Backplane Current Management |
|---|---|
Use Scenario: Real-time monitoring of drain current in GaN/LDMOS power amplifiers biased at 48V–60V in 4G/5G base stations. IC Role / Device Role / Timing Role: High-side current-sense amplifier converting mV-level shunt voltage to 0–2.5V analog output for ADC digitization. Use Value: Enables precise PA efficiency optimization and fault detection without ground-loop interference or added IR drop in signal path. | Use Scenario: Simultaneous current sensing on redundant 12V and 48V power delivery rails in cloud server backplanes. IC Role / Device Role / Timing Role: Dual-channel analog front-end providing synchronized current measurements to BMC or PMBus controller. Use Value: Supports dynamic power capping and hot-swap sequencing with <1% total measurement error across both rails. |
| Industrial PLC Analog Input Modules | Automotive Battery Management Systems |
Use Scenario: High-accuracy current measurement in 24V/48V programmable logic controller I/O modules with 16-bit ADC resolution. IC Role / Device Role / Timing Role: Precision current-sense amplifier driving multiplexed SAR ADC inputs with 14-bit settling in 2µs. Use Value: Achieves <0.05% linearity error over temperature, meeting SIL-2 functional safety requirements for process control. | Use Scenario: Monitoring charge/discharge current in 48V mild-hybrid vehicle battery packs with cell-level balancing circuits. IC Role / Device Role / Timing Role: High-side sense amplifier operating from 3.3V supply while measuring up to 76V pack voltage. Use Value: Eliminates need for isolated power supplies or galvanic isolation components, reducing BOM cost and PCB area. |
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 |
|---|---|---|---|
| INA240A1QDGKRQ1 | Single-channel, 80V max common-mode, 20V/V gain, AEC-Q100 qualified | Requires two devices for dual-channel operation; automotive-qualified but lacks 76V rating | Select for automotive BMS where AEC-Q100 compliance is mandatory and 76V operation not required |
| MAX40056ATA+T | Dual-channel, 65V common-mode, 50V/V gain, WLP-only, no µMAX option | Lower voltage rating and fixed 50V/V gain; incompatible pinout and package | Select when 65V ceiling is sufficient and board space constraints favor WLP over µMAX |
Compared with MAX44285HAUA+, INA240A1QDGKRQ1 offers automotive qualification but requires duplication for dual-channel use and sacrifices 11V common-mode headroom, while MAX40056ATA+T provides identical dual-channel topology but limits maximum sensed voltage to 65V and omits µMAX packaging-making MAX44285HAUA+ the only option supporting 76V operation in industry-standard 8-pin µMAX.
Availability
MAX44285HAUA+ is available at Aetrix Electronics and suitable for server backplanes, telecom base station power amplifiers, and industrial PLC analog input modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX44285HAUA+ 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 industrial, communications, and computing applications.
The MAX44285 product line delivers high-voltage, high-accuracy current sensing for multichannel data acquisition systems where traditional amplifiers fail due to limited common-mode range or excessive offset drift.
FAQ
What is the maximum continuous input voltage rating for MAX44285HAUA+ pins RS1+ and RS2+?
The MAX44285HAUA+ supports continuous input voltages up to +76V on RS1+ and RS2+ relative to GND. Absolute maximum rating is +80V for 1 second due to package thermal dissipation limits in the µMAX package. Operation beyond 76V violates guaranteed specifications and risks parametric degradation.
Does MAX44285HAUA+ require external gain-setting resistors?
No, MAX44285HAUA+ does not require external gain-setting resistors. It integrates all gain-setting resistors internally-RG11/RG12/RG21/RG22 = 10kΩ, R01/R02 = 25kΩ, and RF1/RF2 = 975kΩ-resulting in a fixed 100V/V gain. This eliminates layout sensitivity and resistor matching errors inherent in discrete configurations.
Can MAX44285HAUA+ operate with a 2.7V supply while sensing a 76V common-mode voltage?
Yes, MAX44285HAUA+ operates with VDD = 2.7V while accurately sensing input common-mode voltages from 2.7V to 76V. Its high-voltage p-channel FET input stage decouples common-mode range from supply voltage, enabling battery-monitoring applications where supply rail is significantly lower than sensed rail.
What is the output voltage swing capability of MAX44285HAUA+ at full load?
At 500µA sink/source load, MAX44285HAUA+ delivers VOH = VDD – 0.015V and VOL = 15mV. With no load, VOL drops to 4mV. This rail-to-rail compatible output ensures >99% utilization of a 2.5V ADC reference when paired with the 100V/V gain and 25mV full-scale sense voltage.
Is MAX44285HAUA+ pin-compatible with other MAX44285 variants in µMAX package?
Yes, all MAX44285 µMAX variants-including MAX44285LAWA+, MAX44285TAUA+, MAX44285FAUA+, and MAX44285HAUA+-share identical 8-pin µMAX pinout, footprint, and thermal characteristics. Only gain and top-mark differ; no PCB redesign is needed when upgrading between gain options.
MAX44285HAUA+ 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
MAX44285HAUA+ FAQ
1.How can I place an order for MAX44285HAUA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX44285HAUA+ 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 MAX44285HAUA+ reliable?
The price and inventory of MAX44285HAUA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX44285HAUA+ is usually 5 days.
3.What payment methods are accepted for MAX44285HAUA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX44285HAUA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX44285HAUA+?
MAX44285HAUA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX44285HAUA+ 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 MAX44285HAUA+?
For technical support, including MAX44285HAUA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX44285HAUA+ requirements.
6.How does Aetrix verify that MAX44285HAUA+ is sourced from the original manufacturer or authorized distributors?
All MAX44285HAUA+ 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 MAX44285HAUA+ meets industry standards.
7.What is the process for return or replacement of MAX44285HAUA+?
All MAX44285HAUA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX44285HAUA+, 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 MAX44285HAUA+ part is unused and in its original packaging.
Return procedure for MAX44285HAUA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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