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Analog Devices Inc./Maxim Integrated MAX44285LAUA+
- Part No.:
- MAX44285LAUA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX44285LAUA+.pdf
- Description:
- IC CURRENT SENSE 2 CIRCUIT 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:3,015
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Product details
Overview
MAX44285LAUA+ from Maxim Integrated is a dual-channel, high-precision, high-voltage current-sense amplifier with 12.5V/V fixed gain, ±12μV max input offset voltage, 0.1% max gain error, and 2.7V to 76V input common-mode range. It operates from -40°C to +125°C and is packaged in an 8-pin µMAX package. It enables accurate high-side current monitoring in server backplanes and telecom power systems where ground-path integrity and wide common-mode rejection are critical.
For engineers reviewing the MAX44285LAUA+ datasheet, MAX44285LAUA+ pinout, MAX44285LAUA+ application, or MAX44285LAUA+ equivalent, this page delivers verified pin functions, real-world use cases in multichannel data acquisition, thermal and supply-current behavior across temperature, and validated alternative options for precision high-voltage sensing.
Technical Context
The MAX44285LAUA+ implements a high-voltage p-channel FET–based current mirror architecture that isolates the sense resistor's common-mode voltage (up to 76V) from the 2.7V–5.5V VDD supply rail. Its dual-channel design uses matched internal gain resistors (RG11/RG12/RG21/RG22 = 10kΩ, R01/R02 = 25kΩ, RF1/RF2 = 100kΩ) to achieve 12.5V/V total gain with minimal mismatch-induced error.
It features 80kHz small-signal bandwidth and 140dB typical CMRR at DC, enabling stable interfacing with SAR ADCs in multiplexed systems. Output transient recovery time is 2µs (14-bit settling), and capacitive load stability supports up to 20nF with a 250Ω isolation resistor-critical for anti-aliasing filter integration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 12.5V/V fixed-enables full-scale output of 2.5V with 200mV sense voltage, matching standard ADC reference ranges. |
| Input Offset Voltage | ±12μV max at +25°C-limits minimum resolvable current to ~120nA when using 100mΩ sense resistor. |
| Gain Error | 0.1% max at +25°C-ensures <±1.25mV absolute output error at 2.5V full scale, critical for closed-loop power control. |
| Common-Mode Range | 2.7V to 76V-supports direct sensing on battery inputs down to 2.7V and telecom rails up to 76V without level-shifting. |
| Supply Voltage | 2.7V to 5.5V-compatible with 3.3V and 5V logic domains while maintaining full common-mode operation. |
| Bandwidth | 80kHz -sufficient for monitoring fast-switching loads (e.g., Class AB RF amplifiers) with <1% amplitude error. |
| Operating Temp | -40°C to +125°C-qualified for industrial and base station environments with no derating required. |
Pinout & Package
MAX44285LAUA+ is housed in an 8-pin µMAX package (outline 21-0036), measuring 3.0mm × 3.0mm × 1.1mm, with exposed pad for thermal enhancement. Pin pitch is 0.65mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RS1+ | Channel 1 sense resistor high-side terminal | Connects to power-rail side of RSENSE1; withstands up to +80V transient relative to GND. |
| RS1- | Channel 1 sense resistor low-side terminal | Connects to load side of RSENSE1; referenced to same high-voltage domain as RS1+. |
| RS2+ | Channel 2 sense resistor high-side terminal | Independent high-side input for second current path; shares same 76V common-mode capability. |
| RS2- | Channel 2 sense resistor low-side terminal | Load-side return for channel 2; electrically isolated from channel 1 signal path. |
| VDD | Positive supply input | 2.7V–5.5V digital/analog supply; powers internal op amps and bias circuitry. |
| GND | Analog/digital ground reference | Single ground pin shared by both channels; requires low-impedance connection to system ground plane. |
| OUT1 | Amplified output for channel 1 | Rail-to-rail output driving 500µA sink/source; settles to 14-bit accuracy within 2µs after step. |
| OUT2 | Amplified output for channel 2 | Independent output with identical specs to OUT1; enables simultaneous dual-load monitoring. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent high-side sensing channels | Enables concurrent monitoring of two power rails (e.g., CPU core and memory VRMs) without shared ground interference. |
| 12.5V/V fixed gain with 0.1% max error | Eliminates external gain-setting components and calibration overhead in production test for 200mV full-scale sensing. |
| ±12μV max input offset voltage | Reduces need for system-level offset trimming; supports sub-milliohm sense resistors in high-current applications. |
| 80kHz bandwidth with 2µs transient recovery | Supports real-time current feedback in digitally controlled DC-DC converters operating up to 50kHz switching frequency. |
| 76V input common-mode range | Directly interfaces with 48V telecom, 60V industrial, and 72V battery systems without external level shifters or attenuators. |
Applications
| Base Station Power Amplifier Monitoring | Server Backplane Current Management |
|---|---|
Use Scenario: Real-time current monitoring of GaN-based RF power amplifiers biased at 48V–60V in 5G macro base stations. IC Role / Device Role / Timing Role: High-side current-sense amplifier converting mV-level RSENSE voltage to clean, amplified analog output for ADC digitization. Use Value: Enables precise thermal derating and fault detection with ±0.1% gain accuracy and 12μV offset-reducing false alarms and extending PA lifetime. | Use Scenario: Dual-rail current supervision on 12V and 48V server backplanes for dynamic power budgeting and hot-swap sequencing. IC Role / Device Role / Timing Role: Dual-channel analog front-end providing synchronized current telemetry to BMC via SAR ADC interface. Use Value: Eliminates ground-loop errors in multi-supply domains and supports 80kHz transient capture during PCIe slot insertion events. |
| Industrial PLC Analog Input Modules | High-Voltage Battery Management Systems |
Use Scenario: Isolated current measurement in 24V/48V programmable logic controller I/O modules with field-side sensor loop protection. IC Role / Device Role / Timing Role: Precision analog conditioner feeding isolated sigma-delta ADCs in modular I/O cards. Use Value: Delivers 16-bit-equivalent accuracy over -40°C to +125°C with <0.5% total error-meeting IEC 61000-6-2 immunity requirements. | Use Scenario: Cell-string current monitoring in 60V–76V lithium-titanate or LFP battery packs for EV charging infrastructure. IC Role / Device Role / Timing Role: High-common-mode front-end for bidirectional current sensing in active balancing circuits. Use Value: Supports ±25μV offset drift over temperature-enabling <±0.5% SoC estimation accuracy without periodic recalibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-precision, high-voltage current-sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A1QDGKRQ1 | Single-channel, 20V/V gain, 50kHz bandwidth, ±20μV offset, AEC-Q100 qualified | Automotive-grade only; lacks dual-channel integration and 80kHz bandwidth needed for telecom sampling | Select for automotive BMS where AEC-Q100 compliance is mandatory and single-channel suffices. |
| LT6106IMS8#TRPBF | Single-channel, 100V common-mode, 12.5V/V gain, 85kHz bandwidth, ±150μV offset | Higher offset limits resolution below 1A; no dual-channel option; requires external reference for ratiometric ADC use | Choose when >100V common-mode is required and dual-channel functionality is not needed. |
Compared with MAX44285LAUA+, INA240A1QDGKRQ1 offers automotive qualification but sacrifices dual-channel capability and bandwidth, while LT6106IMS8#TRPBF extends common-mode range but degrades DC accuracy by >12×-making MAX44285LAUA+ optimal for dual-rail, high-accuracy telecom and server applications.
Availability
MAX44285LAUA+ is available at Aetrix Electronics and suitable for base station power management, server backplane telemetry, and industrial PLC analog input modules requiring stable component supply across extended temperature and high-voltage operating conditions.
Supply support for MAX44285LAUA+ 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 data acquisition in telecom infrastructure, server power systems, and industrial automation-prioritizing offset stability, gain fidelity, and thermal robustness over cost or integration density.
FAQ
What is the maximum continuous common-mode voltage supported by MAX44285LAUA+?
The MAX44285LAUA+ supports a continuous input common-mode voltage range of 2.7V to 76V. Absolute maximum ratings allow RS+/RS- pins to tolerate up to +80V relative to GND for short durations (≤1s), limited by package thermal dissipation. This enables direct sensing on 48V telecom rails and 60V industrial buses without external attenuation.
Does MAX44285LAUA+ require external gain-setting resistors?
No, MAX44285LAUA+ does not require external gain-setting resistors. It integrates all precision gain resistors internally-RG11/RG12/RG21/RG22 = 10kΩ, R01/R02 = 25kΩ, and RF1/RF2 = 100kΩ-to deliver a fixed 12.5V/V gain. This eliminates layout sensitivity, resistor matching errors, and calibration steps in production.
Can MAX44285LAUA+ drive a 1nF capacitive load directly?
MAX44285LAUA+ can drive up to 200pF capacitance directly without isolation resistance. For larger capacitive loads such as 1nF (typical of SAR ADC sampling networks), a 250Ω series isolation resistor is required to maintain stability and prevent peaking or oscillation, as confirmed in the datasheet's capacitive load stability specification.
What is the supply current consumption of MAX44285LAUA+ over temperature?
MAX44285LAUA+ draws 1300µA typical at +25°C and up to 1500µA across the full -40°C to +125°C operating range. Supply current varies less than ±5% over 2.7V–5.5V VDD and shows monotonic increase with temperature-peaking near 900µA at +125°C per channel, as shown in Figure toc10.
Is MAX44285LAUA+ pin-compatible with other variants in the MAX44285 family?
Yes, MAX44285LAUA+ is pin-compatible with all other MAX44285 variants (T/F/H suffixes) in the same package type. The µMAX package pinout is identical across gain options-only internal resistor values differ. This allows hardware reuse across designs targeting different full-scale sense voltages (200mV, 125mV, 50mV, or 25mV).
MAX44285LAUA+ 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
MAX44285LAUA+ FAQ
1.How can I place an order for MAX44285LAUA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX44285LAUA+ 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 MAX44285LAUA+ reliable?
The price and inventory of MAX44285LAUA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX44285LAUA+ is usually 5 days.
3.What payment methods are accepted for MAX44285LAUA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX44285LAUA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX44285LAUA+?
MAX44285LAUA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX44285LAUA+ 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 MAX44285LAUA+?
For technical support, including MAX44285LAUA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX44285LAUA+ requirements.
6.How does Aetrix verify that MAX44285LAUA+ is sourced from the original manufacturer or authorized distributors?
All MAX44285LAUA+ 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 MAX44285LAUA+ meets industry standards.
7.What is the process for return or replacement of MAX44285LAUA+?
All MAX44285LAUA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX44285LAUA+, 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 MAX44285LAUA+ part is unused and in its original packaging.
Return procedure for MAX44285LAUA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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