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Analog Devices Inc./Maxim Integrated MAX44285TAUA+T
- Part No.:
- MAX44285TAUA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX44285TAUA+T.pdf
- Description:
- IC CURRENT SENSE 2 CIRCUIT 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:3,308
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Product details
Overview
The MAX44285TAUA+T from Maxim Integrated is a dual-channel, high-precision, high-voltage current-sense amplifier with 20V/V fixed gain, 2.7V–76V input common-mode range, ±12μV max input offset voltage at +25°C, 0.1% max gain error at +25°C, and 80kHz small-signal bandwidth-designed for high-side current monitoring in multichannel power management systems interfacing with SAR ADCs.
For engineers reviewing the MAX44285TAUA+T datasheet, MAX44285TAUA+T pinout, MAX44285TAUA+T application, or MAX44285TAUA+T equivalent, this page delivers verified technical context, package-specific pin functions, real-world use cases in base stations and server backplanes, and validated alternative options for precision high-voltage sensing designs.
Technical Context
The MAX44285TAUA+T implements a high-side current-sense architecture using matched internal gain resistors (RG11/RG12 = RG21/RG22 = 10kΩ) and output-stage feedback (RF1/RF2 = 175kΩ) to achieve precise 20V/V gain without external components. Its BiCMOS process enables rail-to-rail output swing and low input bias current (65μA).
It operates independently of supply voltage for common-mode rejection: VCM remains functional from 2.7V to 76V while VDD is constrained to 2.7V–5.5V. AC CMRR exceeds 54dB at 200kHz, and saturation recovery time is 10μs-critical for fast transient detection in telecom power amplifiers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 20V/V fixed-enables accurate 125mV full-scale sense voltage conversion without external gain-setting resistors. |
| Input Offset Voltage | ±12μV max at +25°C-minimizes measurement error at low load currents, supporting sub-milliohm sense resistor use. |
| Gain Error | 0.1% max at +25°C-ensures consistent scaling across channels for differential current monitoring in redundant power rails. |
| Common-Mode Range | 2.7V to 76V-supports direct high-side sensing on battery inputs down to 2.7V and telecom PA rails up to 76V. |
| Small-Signal Bandwidth | 80kHz-sufficient for sampling fast-switching DC-DC converter currents and multiplexed data acquisition at ≤100ksps. |
| Supply Current | 1.5mA max over -40°C to +125°C-enables always-on monitoring in thermally demanding industrial environments. |
| Output Low Voltage | 15mV at 500μA sink-guarantees clean logic-level compatibility with 3.3V ADC reference inputs. |
Pinout & Package
MAX44285TAUA+T uses the 8-pin µMAX package (outline 21-0036), measuring 3.0mm × 3.0mm × 1.1mm, 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 Kelvin pair with RS1+ for accurate differential sensing. |
| RS2+ | Channel 2 high-side sense input | Independent second channel input; supports simultaneous monitoring of dual power domains. |
| RS2- | Channel 2 low-side sense input | Paired with RS2+; enables true differential rejection of common-mode noise between channels. |
| VDD | Positive supply | 2.7V–5.5V analog/digital supply; powers both channels and internal bias circuitry. |
| GND | Analog ground reference | Single-point return for all internal circuits; must be isolated from noisy digital ground planes. |
| OUT1 | Channel 1 amplified output | High-impedance rail-to-rail output driving ADC input or comparator; 0.1mΩ output resistance. |
| OUT2 | Channel 2 amplified output | Matched performance to OUT1; allows synchronous sampling of two independent current paths. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent high-side channels | Enables concurrent monitoring of two power rails (e.g., CPU core + memory VRMs) without shared reference errors. |
| 20V/V fixed gain | Eliminates external resistor selection and layout sensitivity-reduces BOM count and improves production yield. |
| ±12μV max input offset | Supports accurate 10mA–100A current sensing with 100μΩ–10mΩ shunts, minimizing I²R losses. |
| 80kHz bandwidth with 2μs settling | Meets timing requirements for 14-bit SAR ADC sampling at 100ksps with full resolution. |
| -40°C to +125°C operation | Validated for under-hood automotive modules, base station RF power amps, and industrial motor drives. |
Applications
| Base Station Power Amplifier Monitoring | Server Backplane Current Supervision |
|---|---|
Use Scenario: Real-time current monitoring of GaN-based RF power amplifiers operating at 48V–60V DC supply rails in 5G macro base stations. IC Role / Device Role / Timing Role: High-side current-sense amplifier converting mV-level shunt voltage to 2.5V-range ADC-compatible output with <10μs saturation recovery. Use Value: Enables closed-loop bias control and fault detection before thermal runaway, leveraging 76V common-mode tolerance and ±12μV offset for <0.5% full-scale error. |
Use Scenario: Dual-rail current supervision on 12V and 3.3V server backplane power distribution networks with hot-swap controllers. IC Role / Device Role / Timing Role: Simultaneous high-side sensing of primary and standby rails using matched dual channels with <0.1% gain matching. Use Value: Provides correlated current data for dynamic power budgeting and predictive failure analysis, supported by 80kHz bandwidth and 1.5mA quiescent current. |
| Industrial PLC Power Module Protection | Telecom DC Power Distribution Unit (PDU) |
Use Scenario: Overcurrent detection in programmable logic controller (PLC) output modules driving 24V solenoid loads with variable duty cycles. IC Role / Device Role / Timing Role: High-side current sensor feeding safety-critical watchdog circuitry with 10μs saturation recovery and guaranteed -40°C to +125°C operation. Use Value: Enables immediate shutdown on short-circuit events without false triggers from common-mode transients, thanks to 140dB DC CMRR. |
Use Scenario: Redundant current monitoring across dual-input 48V telecom PDUs feeding distributed radio units. IC Role / Device Role / Timing Role: Dual-channel amplifier providing independent measurements for load balancing and fault isolation in N+1 power architectures. Use Value: Delivers <0.3% total error over temperature using 20V/V gain and 0.1% max gain error-critical for accurate billing-grade energy metering. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-precision, high-voltage current-sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A1QDRQ1 | Single-channel, 20V/V gain, 85dB min CMRR, 500kHz bandwidth, AEC-Q100 qualified | Automotive-grade single-channel replacement; lacks dual-channel integration and 76V VCM | Select when automotive qualification is mandatory and dual-channel functionality is not required. |
| MAX40088AUT#TG16 | Dual-channel, 20V/V gain, 2.7V–65V VCM, ±15μV max VOS, 100kHz bandwidth | Lower common-mode range (65V vs. 76V); higher bandwidth but slightly higher offset | Choose for faster transient response where 65V VCM suffices and 100kHz bandwidth improves ADC oversampling. |
Compared with MAX44285TAUA+T, INA240A1QDRQ1 trades dual-channel integration and 76V VCM for automotive qualification and higher bandwidth, while MAX40088AUT#TG16 offers faster response but reduced high-voltage margin-making MAX44285TAUA+T optimal for telecom and industrial 76V systems requiring dual-rail correlation.
Availability
MAX44285TAUA+T is available at Aetrix Electronics and suitable for base station power amplifiers, server backplane monitoring, and industrial PLC protection requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for MAX44285TAUA+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 power monitoring in telecom infrastructure, server platforms, and ruggedized industrial controls-prioritizing offset stability, common-mode robustness, and dual-channel correlation.
FAQ
What is the exact gain configuration of MAX44285TAUA+T?
The MAX44285TAUA+T is factory-configured for 20V/V fixed gain, corresponding to the "T" suffix per Maxim's ordering nomenclature. This gain setting is implemented via internal laser-trimmed resistors (R01/R02 = 25kΩ, RG11/RG12/RG21/RG22 = 10kΩ, RF1/RF2 = 175kΩ) and requires no external components. The 20V/V gain supports a full-scale sense voltage of 125mV, enabling precise current measurement with minimal shunt loss.
Does MAX44285TAUA+T support operation at 76V common-mode voltage continuously?
Yes, MAX44285TAUA+T is fully specified for continuous operation at 76V input common-mode voltage (VCM), as confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables. The RS+ and RS- pins tolerate up to +80V relative to GND for transient conditions (1s duration), and the device maintains 125dB min DC CMRR across the full 2.7V–76V VCM range-ensuring accuracy in high-voltage telecom and industrial applications.
What package type does MAX44285TAUA+T use, and is it RoHS-compliant?
MAX44285TAUA+T uses the 8-pin µMAX package (outline 21-0036), with dimensions 3.0mm × 3.0mm × 1.1mm and an exposed thermal pad. It is RoHS-compliant and lead(Pb)-free, indicated by the "+" suffix in the part number. The µMAX package provides superior thermal performance versus WLP variants, with θJA = 206.3°C/W and 387.8mW max power dissipation at +70°C ambient.
How does MAX44285TAUA+T handle saturation and recover from overcurrent events?
MAX44285TAUA+T features a saturation recovery time of 10μs, measured from output clipping to 14-bit settling after a large step input. During saturation, the output enters high-impedance state (Note 5), preventing loading of downstream ADCs. Recovery is enabled by internal compensation and rail-to-rail output stage design-critical for detecting fast overcurrent faults in switch-mode power supplies and motor drives without missing subsequent events.
Can MAX44285TAUA+T interface directly with a 3.3V SAR ADC?
Yes, MAX44285TAUA+T is optimized for direct interfacing with 3.3V SAR ADCs. Its rail-to-rail output swings from 4mV (VOL, no load) to VDD – 15mV (VOH, 500μA source), delivering a clean 0–3.3V output range. With 80kHz bandwidth and 2μs transient recovery, it meets settling requirements for 14-bit conversion at ≥100ksps sampling rates-eliminating need for external buffer or level-shifting circuitry.
MAX44285TAUA+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
MAX44285TAUA+T FAQ
1.How can I place an order for MAX44285TAUA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX44285TAUA+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 MAX44285TAUA+T reliable?
The price and inventory of MAX44285TAUA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX44285TAUA+T is usually 5 days.
3.What payment methods are accepted for MAX44285TAUA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX44285TAUA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX44285TAUA+T?
MAX44285TAUA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX44285TAUA+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 MAX44285TAUA+T?
For technical support, including MAX44285TAUA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX44285TAUA+T requirements.
6.How does Aetrix verify that MAX44285TAUA+T is sourced from the original manufacturer or authorized distributors?
All MAX44285TAUA+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 MAX44285TAUA+T meets industry standards.
7.What is the process for return or replacement of MAX44285TAUA+T?
All MAX44285TAUA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX44285TAUA+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 MAX44285TAUA+T part is unused and in its original packaging.
Return procedure for MAX44285TAUA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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