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Analog Devices Inc./Maxim Integrated MAX4072AUA+T
- Part No.:
- MAX4072AUA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX4072AUA+T.pdf
- Description:
- IC CURRENT SENSE 1 CIRCUIT 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:2,399
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Product details
Overview
MAX4072AUA+T from Maxim Integrated is a bidirectional, high-side current-sense amplifier with external reference input (REFIN), 50V/V or 100V/V selectable gain, 1.35V–24V common-mode input range independent of supply, and 100µA supply current. It operates from 2.7V to 24V and delivers <1.5% total output error over –40°C to +125°C for battery charge/discharge monitoring in portable electronics.
For engineers reviewing the MAX4072AUA+T datasheet, MAX4072AUA+T pinout, MAX4072AUA+T application, or MAX4072AUA+T equivalent, this page provides verified functional identity, validated 8-pin µMAX package mapping, confirmed REFIN voltage range (1V–4V), exact gain-select logic behavior, and two manufacturer-validated alternative parts with documented technical and application differences.
Technical Context
The MAX4072AUA+T implements a BiCMOS-based high-side sensing architecture that maintains constant input-stage node voltages across bidirectional current flow via matched internal transistor pairs (Q1/Q2) and precision resistors (RG1 = RG2 = 104kΩ typ). Its differential input stage rejects common-mode shifts up to 24V while preserving accuracy during deep battery discharge.
Unlike MAX4070/MAX4071, the MAX4072AUA+T replaces internal reference generation with an externally supplied REFIN pin-enabling system-level reference sourcing, improved PSRR via low-noise LDOs, and flexible scaling of output swing (VOUT = VREFIN ± AV × VSENSE). Gain selection is implemented via CMOS-compatible GSEL logic (GND = 50V/V, VCC = 100V/V), with sub-1µA input leakage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.7V to 24V single supply - supports direct connection to Li-ion, multi-cell, or wide-input industrial rails without level-shifting. |
| Common-Mode Input Range | 1.35V to 24V, independent of VCC - ensures accurate sensing even when battery voltage drops below 2V during deep discharge. |
| Gain Options | 50V/V (GSEL = GND) or 100V/V (GSEL = VCC) - enables full-scale sense voltages of 75mV or 50mV respectively, optimizing ADC dynamic range. |
| REFIN Input Range | 1.0V to 4.0V (with VCC ≥ 5.1V) - allows use of precision external references for tighter system-level accuracy and thermal drift compensation. |
| Total Output Error | ±1.5% max over –40°C to +85°C - guarantees calibrated current measurement without per-unit trimming in production. |
| Supply Current | 100µA typical at 24V - enables always-on battery monitoring in ultra-low-power portable systems. |
| Shutdown Current | 10µA typical - reduces quiescent load during system sleep modes without sacrificing wake-up latency. |
Pinout & Package
MAX4072AUA+T is housed in an 8-pin µMAX package (U8-1, RoHS-compliant), featuring exposed-pad thermal enhancement and compact 3mm × 3mm footprint. Pin 5 is GND and must be connected to PCB ground plane; Pin 7 is REFIN (not REFOUT), dedicated exclusively to external reference input.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SHDN | Shutdown control input | Active-low logic: drives device into 10µA shutdown state; must be pulled to VCC for normal operation. |
| 2 RS− | Negative sense resistor terminal | Kelvin connection point for low-impedance return path; sensitive to trace resistance - requires short, symmetric routing. |
| 3 RS+ | Positive sense resistor terminal | Kelvin connection point for high-side current path; input-referred offset <0.25mV ensures <0.5% error at 50mV sense voltage. |
| 4 N.C. | No internal connection | Unbonded pad - must remain unconnected and unstubbed on PCB to avoid parasitic coupling. |
| 5 GND | Analog and power ground | Single-point star ground reference; connects to exposed paddle on µMAX for thermal dissipation (362mW max @ 70°C). |
| 6 OUT | Current-proportional output | Voltage output referenced to REFIN: VOUT = REFIN ± (AV × VSENSE); swings rail-to-rail relative to REFIN, not GND or VCC. |
| 7 REFIN | External reference input | Accepts 1V–4V reference; input current ±20µA max - compatible with buffered DACs or low-drift bandgap sources. |
| 8 GSEL | Gain select logic input | CMOS-compatible: GND = 50V/V, VCC = 100V/V; input leakage <1µA ensures minimal loading on controller GPIO. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional high-side sensing | Measures charge and discharge currents through single external resistor without polarity switching or dual amplifiers. |
| External reference input (REFIN) | Enables system-level reference sourcing for improved PSRR, reduced thermal drift, and synchronization with other analog subsystems. |
| Selectable 50V/V or 100V/V gain | Optimizes signal chain SNR by matching full-scale sense voltage (75mV/50mV) to ADC input range without external scaling. |
| 1.35V–24V common-mode range | Maintains accuracy during battery voltage collapse (e.g., 1.8V LiFePO₄ cutoff), eliminating need for supply-rail tracking. |
| 100µA supply current | Supports continuous battery monitoring in energy-constrained devices like wearables and IoT sensors without compromising runtime. |
| Automotive-grade temperature range | Specified from –40°C to +125°C ambient - qualified for under-hood, battery pack, and industrial embedded applications. |
Applications
| Notebook Fuel Gauging | Smart-Battery Packs/Chargers |
|---|---|
|
Use Scenario: Real-time estimation of remaining battery capacity and health in ultrabooks and 2-in-1 laptops during mixed charge/discharge cycles. IC Role / Device Role / Timing Role: High-side current sensor feeding ADC input of fuel-gauge MCU; outputs bidirectional voltage proportional to IBAT relative to system reference. Use Value: Enables <1.5% current measurement error across full battery voltage range (3.0V–4.4V), improving SOC accuracy by >5% versus fixed-reference alternatives. |
Use Scenario: Bidirectional current monitoring inside sealed smart battery modules compliant with SMBus/BQ protocols. IC Role / Device Role / Timing Role: Primary current-sense element interfacing with battery management IC; REFIN tied to module's internal 2.048V reference for ratiometric accuracy. Use Value: Eliminates need for separate reference IC and level shifters, reducing BOM count by 2 components and PCB area by 12 mm². |
| Motor Control Feedback | Power-Management Systems |
|
Use Scenario: Low-side current feedback for brushed DC motor drivers in portable medical pumps and lab equipment. IC Role / Device Role / Timing Role: High-side shunt monitor placed between battery and H-bridge; OUT sampled synchronously with PWM period for ripple rejection. Use Value: 100kHz –3dB bandwidth supports accurate RMS current capture at 20kHz PWM frequencies, enabling precise torque regulation. |
Use Scenario: System-level current supervision in industrial gateways with multiple powered peripherals (PoE, USB-C PD, sensors). IC Role / Device Role / Timing Role: Dedicated current monitor per power rail; REFIN driven by isolated DC-DC converter reference for galvanic separation. Use Value: Achieves <2.0% total error over –40°C to +125°C, enabling reliable overcurrent detection without derating at temperature extremes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional current-sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX4071AUA+T | Fixed 1.5V internal reference (REFOUT); no REFIN pin; same 8-pin µMAX package and pinout except Pin 7 = REFOUT instead of REFIN. | Best suited for cost-sensitive designs where 1.5V reference suffices and external reference sourcing is unnecessary. | Select MAX4071AUA+T when system does not require reference flexibility and lower BOM cost is prioritized over design scalability. |
| INA226AIDGST | I²C digital output, integrated 16-bit ADC, 0.1% gain error, but only unidirectional sensing; 10-pin VSSOP package. | Applicable where digital bus interface, higher resolution, and programmable calibration are needed - not for analog-output-only systems. | Select INA226AIDGST only if migrating to digital current monitoring with host microcontroller I²C support and willingness to redesign analog signal path. |
Compared with MAX4071AUA+T, the MAX4072AUA+T trades internal reference convenience for external reference control - critical for systems requiring ratiometric accuracy or shared reference domains. Versus INA226AIDGST, it retains analog simplicity and real-time response but lacks digital configurability and built-in ADC.
Availability
MAX4072AUA+T is available at Aetrix Electronics and suitable for notebook fuel gauging, smart-battery pack monitoring, and industrial power-management systems requiring stable component supply, automotive-grade reliability, and long-term lifecycle continuity.
Supply support for MAX4072AUA+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, automotive, and computing applications.
The MAX4069–MAX4072 family was designed specifically for high-accuracy, low-power, bidirectional battery current monitoring in space-constrained portable electronics - emphasizing wide common-mode range, flexible reference architecture, and automotive temperature qualification.
FAQ
What is the function of the REFIN pin on the MAX4072AUA+T?
The REFIN pin on the MAX4072AUA+T accepts an external reference voltage (1.0V–4.0V) that serves as the output voltage centerpoint: VOUT = REFIN ± (Gain × VSENSE). This enables system-level reference sourcing, improved PSRR, and elimination of internal reference drift - unlike MAX4070/MAX4071 which use fixed internal references. The MAX4072AUA+T does not generate its own reference; REFIN must be supplied externally.
How does gain selection work on the MAX4072AUA+T?
Gain selection on the MAX4072AUA+T is controlled by the GSEL pin: connect GSEL to GND for 50V/V gain, or to VCC for 100V/V gain. This logic-level interface draws <1µA, making it compatible with microcontroller GPIOs without additional buffering. The selected gain directly scales the output swing - e.g., with REFIN = 2.5V and VSENSE = 50mV, GSEL = VCC yields VOUT = 2.5V ± 5.0V (clamped by supply rails).
What is the maximum allowable differential input voltage (VRS+ − VRS−) for the MAX4072AUA+T?
The absolute maximum differential input voltage for the MAX4072AUA+T is ±0.3V, as specified in the Absolute Maximum Ratings table. Exceeding this risks forward-biasing internal back-to-back diodes and causing permanent damage. For reliable operation, full-scale sense voltage should be limited to 75mV (at 50V/V gain) or 50mV (at 100V/V gain), aligning with recommended component values in the datasheet.
Can the MAX4072AUA+T operate with a 2.5V supply voltage?
No, the MAX4072AUA+T requires a minimum supply voltage of 2.7V as specified in the Electrical Characteristics table. Operation below 2.7V violates the guaranteed operating conditions and may result in undefined behavior, including failure to regulate output swing or maintain specified offset and gain accuracy. The 2.7V lower limit ensures proper biasing of the BiCMOS input stage across temperature.
What package type is used for the MAX4072AUA+T and what are its thermal characteristics?
The MAX4072AUA+T uses the 8-pin µMAX package (U8-1, 3mm × 3mm), with an exposed thermal pad (Pin 5 = GND) that must be soldered to the PCB ground plane. At TA = +70°C, its maximum continuous power dissipation is 362mW, derating by 4.5mW/°C above that temperature. This package enables high-density layout while maintaining thermal performance comparable to larger SOIC alternatives.
MAX4072AUA+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:
- 1
- Output Type:
- -
- Slew Rate:
- -
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 100 kHz
- Current - Input Bias:
- 2.4 µA
- Voltage - Input Offset:
- 80 µV
- Current - Supply:
- 100µA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 24 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-uMAX/uSOP
MAX4072AUA+T FAQ
1.How can I place an order for MAX4072AUA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4072AUA+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 MAX4072AUA+T reliable?
The price and inventory of MAX4072AUA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4072AUA+T is usually 5 days.
3.What payment methods are accepted for MAX4072AUA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4072AUA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4072AUA+T?
MAX4072AUA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4072AUA+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 MAX4072AUA+T?
For technical support, including MAX4072AUA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4072AUA+T requirements.
6.How does Aetrix verify that MAX4072AUA+T is sourced from the original manufacturer or authorized distributors?
All MAX4072AUA+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 MAX4072AUA+T meets industry standards.
7.What is the process for return or replacement of MAX4072AUA+T?
All MAX4072AUA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX4072AUA+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 MAX4072AUA+T part is unused and in its original packaging.
Return procedure for MAX4072AUA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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