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Analog Devices Inc./Maxim Integrated MAX44285LAWA+T
- Part No.:
- MAX44285LAWA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-WFBGA, WLBGA
- Datasheet:
-
MAX44285LAWA+T.pdf
- Description:
- IC CURR SENSE 2 CIRCUIT 8WLP
- Quantity:
- Payment:
- Shipping:
Inventory:19,178
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Product details
Overview
MAX44285LAWA+T 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 - designed for high-side current monitoring in multichannel power management systems interfacing with SAR ADCs.
For engineers reviewing the MAX44285LAWA+T datasheet, MAX44285LAWA+T pinout, MAX44285LAWA+T application, or MAX44285LAWA+T equivalent, this page delivers verified specifications, package mapping, thermal performance data, real-world use scenarios in base stations and server backplanes, and validated alternative options for precision high-voltage sensing.
Technical Context
The MAX44285LAWA+T implements a high-voltage p-channel FET-based current mirror architecture that enables accurate high-side sensing independent of VDD. Its two matched channels share identical internal gain resistors (RG11 = RG12 = RG21 = RG22 = 10kΩ) and output-stage feedback networks (RF1 = RF2 = 100kΩ, R01 = R02 = 25kΩ), delivering precisely trimmed 12.5V/V total gain.
It features rail-to-rail output swing with 15mV max VOL at 500µA sink load and VDD − 0.015V VOH at 500µA source load, operates from 2.7V to 5.5V supply, and maintains 125dB min CMRR across its full 2.7V–76V common-mode range - enabling stable operation in noisy, high-voltage industrial and telecom environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 12.5V/V - fixed ratio enabling direct conversion of 200mV full-scale sense voltage to 2.5V output for 12-bit ADC compatibility |
| Input Offset Voltage (max) | ±12µV - ensures ≤0.006% error at 200mV sense voltage, critical for low-current accuracy |
| Gain Error (max) | 0.1% - guarantees ≤2.5mV absolute gain deviation at 2.5V output, supporting <0.5% system-level current measurement accuracy |
| Input Common-Mode Range | 2.7V to 76V - supports battery monitoring down to 2.7V and high-side sensing in 48V/60V telecom rails without level-shifting |
| Small-Signal Bandwidth | 80kHz - sufficient for sampling fast transient currents in power amplifier bias control loops |
| Supply Voltage Range | 2.7V to 5.5V - compatible with standard 3.3V and 5V logic supplies while isolating analog sensing domain |
| Operating Temperature | −40°C to +125°C - qualified for under-hood automotive, industrial motor drives, and base station outdoor cabinets |
Pinout & Package
MAX44285LAWA+T is supplied in an 8-bump wafer-level package (WLP), measuring 1mm × 2mm, with 0.4mm pitch and bottom-side solder pads. Thermal resistance θJA is 75°C/W on a 4-layer JEDEC board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RS1+, RS2+ | Channel 1 & 2 high-side sense inputs | Accept up to +76V common-mode; connect directly to power-rail side of sense resistor |
| RS1−, RS2− | Channel 1 & 2 low-side sense inputs | Reference node for differential sense voltage; must be Kelvin-connected to minimize trace IR error |
| OUT1, OUT2 | Amplified output channels | Rail-to-rail outputs drive ADC inputs directly; 0.1mΩ output resistance minimizes loading effects |
| VDD | Positive supply | 2.7V–5.5V digital/analog supply; powers internal op amps and bias circuitry |
| GND | Analog ground reference | Single-point return for all internal circuits; must be isolated from power ground to avoid noise coupling |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent high-side channels | Enables simultaneous monitoring of two power rails (e.g., PA bias and DC-DC output) without shared error sources |
| Ultra-low 12µV max VOS | Reduces minimum resolvable current by >2× vs. typical 25µV amplifiers, enabling sub-10mA detection with 100mΩ shunt |
| 80kHz small-signal bandwidth | Supports accurate capture of switching ripple and transient events in 48V server VRMs and telecom PSUs |
| 76V max common-mode voltage | Eliminates need for external level shifters or isolation when monitoring 48V/60V systems like LTE base station PAs |
| 1mm × 2mm WLP footprint | Minimizes PCB area in space-constrained modules such as compact power sequencers and hot-swap controllers |
Applications
| Base Station Power Amplifier Monitoring | Server Backplane Current Supervision |
|---|---|
Use Scenario: Real-time monitoring of RF power amplifier drain current in LTE/5G macro base stations operating at 48V–60V supply rails. IC Role / Device Role / Timing Role: High-side current-sense amplifier converting mV-level shunt voltage into clean, amplified analog signal for ADC digitization. Use Value: Enables precise PA bias control and fault detection with <0.1% gain error and ±12µV offset - reducing shunt power loss by allowing smaller RSENSE values. |
Use Scenario: Continuous current measurement across redundant 12V/48V backplane power feeds in cloud server racks. IC Role / Device Role / Timing Role: Dual-channel high-voltage sensor providing independent analog outputs for real-time load balancing and overcurrent shutdown logic. Use Value: 76V common-mode range allows direct connection to high-side of backplane fuses; dual channel eliminates need for two discrete amplifiers per feed. |
| Industrial Motor Drive Phase Current Sensing | High-Voltage Battery Management System |
Use Scenario: Shunt-based phase current measurement in 400V–690V AC motor inverters with isolated gate drivers. IC Role / Device Role / Timing Role: High-side current amplifier feeding isolated sigma-delta ADCs; operates with floating ground referenced to phase voltage. Use Value: 80kHz bandwidth captures PWM-edge transients; −40°C to +125°C rating supports operation near IGBT heatsinks. |
Use Scenario: Cell-string current monitoring in 300V–800V EV battery packs during charge/discharge cycles. IC Role / Device Role / Timing Role: Precision high-side monitor placed between battery pack positive terminal and main contactor, reporting to BMS MCU via ADC. Use Value: 2.7V–76V common-mode range accommodates partial-string monitoring (e.g., 16S Li-ion = ~64V); low VOS preserves resolution at low C-rate currents. |
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 |
|---|---|---|---|
| INA240A1QDGKRQ1 | Single-channel, 80V max common-mode, 100µV max VOS, 0.3% max gain error, SOIC-8 package | Lacks dual-channel integration; requires two devices for same functionality; larger 3.9mm × 4.9mm footprint | Select when single-channel monitoring suffices and AEC-Q100 qualification is required for automotive BMS |
| MAX40056ATA+T | Dual-channel, 65V max common-mode, 25µV max VOS, 0.2% max gain error, 8-WLP package | Lower common-mode range limits use in 72V telecom or 60V PA applications; higher VOS reduces low-current resolution | Select when cost sensitivity outweighs need for 76V rating and ultra-low offset, and existing layout supports same 1mm × 2mm WLP |
Compared with MAX44285LAWA+T, INA240A1QDGKRQ1 offers automotive qualification but doubles component count and board area for dual-rail monitoring, while MAX40056ATA+T shares the WLP form factor but sacrifices 11V common-mode headroom and 13µV offset performance - making MAX44285LAWA+T optimal for space-constrained, high-accuracy 76V systems.
Availability
MAX44285LAWA+T is available at Aetrix Electronics and suitable for base station power management, server backplane supervision, and industrial motor drive current sensing requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX44285LAWA+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 dual-channel, high-voltage current-sense amplifiers optimized for accuracy-critical power monitoring in telecom infrastructure, data center power systems, and high-reliability industrial controls.
FAQ
What is the exact gain configuration of MAX44285LAWA+T?
The MAX44285LAWA+T is the L-grade variant of the MAX44285 family and provides a fixed gain of 12.5V/V. This is achieved through factory-trimmed internal resistor networks (R01/R02 = 25kΩ, RG11/RG12/RG21/RG22 = 10kΩ, RF1/RF2 = 100kΩ), ensuring guaranteed 0.1% max gain error across temperature. The 'L' suffix explicitly denotes this 12.5V/V option.
Does MAX44285LAWA+T support operation at 76V common-mode voltage continuously?
Yes, MAX44285LAWA+T is fully specified for continuous operation with input common-mode voltages from 2.7V to 76V. Its internal high-voltage p-channel FET architecture enables this capability independent of the 2.7V–5.5V VDD supply. Absolute maximum ratings allow ±50V transient stress on RS+ and RS− pins for 1 second due to WLP thermal limits.
What package type does MAX44285LAWA+T use, and what are its key mechanical properties?
MAX44285LAWA+T uses an 8-bump wafer-level package (WLP) with dimensions of 1.0mm × 2.0mm and 0.4mm pitch. It features bottom-side solder balls, JEDEC-standard thermal resistance (θJA = 75°C/W on 4-layer board), and RoHS-compliant lead-free construction denoted by the '+' suffix. The top mark is '+AAF'.
How does the input offset voltage of MAX44285LAWA+T impact low-current sensing accuracy?
With a maximum input offset voltage of ±12µV, MAX44285LAWA+T introduces ≤0.006% error when measuring a 200mV full-scale sense voltage. For example, using a 10mΩ shunt, this corresponds to ≤1.2mA absolute offset error - enabling reliable detection of load currents below 100mA in battery-powered or standby-power monitoring applications.
Can MAX44285LAWA+T interface directly with a 12-bit SAR ADC without additional signal conditioning?
Yes, MAX44285LAWA+T is specifically designed for direct SAR ADC interfacing. Its 12.5V/V gain converts a 200mV full-scale shunt voltage to a 2.5V output - matching the typical 2.5V reference of 12-bit ADCs like the MAX11125. Combined with rail-to-rail output swing, low 15mV VOL, and 80kHz bandwidth, it delivers clean, digitizable signals without external buffers or level shifters.
MAX44285LAWA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-WFBGA, WLBGA
- Packaging:
- Bulk
- 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-WLP
MAX44285LAWA+T FAQ
1.How can I place an order for MAX44285LAWA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX44285LAWA+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 MAX44285LAWA+T reliable?
The price and inventory of MAX44285LAWA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX44285LAWA+T is usually 5 days.
3.What payment methods are accepted for MAX44285LAWA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX44285LAWA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX44285LAWA+T?
MAX44285LAWA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX44285LAWA+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 MAX44285LAWA+T?
For technical support, including MAX44285LAWA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX44285LAWA+T requirements.
6.How does Aetrix verify that MAX44285LAWA+T is sourced from the original manufacturer or authorized distributors?
All MAX44285LAWA+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 MAX44285LAWA+T meets industry standards.
7.What is the process for return or replacement of MAX44285LAWA+T?
All MAX44285LAWA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX44285LAWA+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 MAX44285LAWA+T part is unused and in its original packaging.
Return procedure for MAX44285LAWA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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