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Analog Devices Inc./Maxim Integrated MAX4071AUA+T
- Part No.:
- MAX4071AUA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX4071AUA+T.pdf
- Description:
- IC CURRENT SENSE 1 CIRCUIT 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:1,073
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Product details
Overview
MAX4071AUA+T from Maxim Integrated is a bidirectional, high-side current-sense amplifier with integrated 1.5V precision reference, designed for battery charge/discharge monitoring in portable electronics. It operates from 2.7V to 24V supply, supports selectable gain (50V/V or 100V/V), delivers <1.5% total output error over -40°C to +125°C, and features 100µA quiescent current - dropping to 10µA in shutdown. It enables accurate fuel gauging in notebook and smart-battery systems using external sense resistors.
For engineers reviewing the MAX4071AUA+T datasheet, MAX4071AUA+T pinout, MAX4071AUA+T application, or MAX4071AUA+T equivalent, this page provides verified technical context, package-specific pin functions, real-world application mappings, and validated alternative options - all grounded in Maxim's official datasheet Rev 4 (11/2016) and ordering documentation.
Technical Context
The MAX4071AUA+T implements a BiCMOS-based high-side sensing architecture with differential input stage that maintains constant input terminal voltages across bidirectional current flow, enabling precise VSENSE measurement independent of common-mode voltage (1.35V–24V). Its internal 1.5V reference is trimmed to ±30mV over temperature (±20 ppm/°C max), and output swings from VREF to VCC for charge current and from VREF to GND for discharge current.
Gain selection is controlled by the GSEL pin (GND = 50V/V, VCC = 100V/V), and shutdown mode is activated via SHDN pin, placing OUT in high-impedance state while reducing supply current to ≤10µA. The device achieves 100kHz bandwidth at 50V/V gain and 40kHz at 100V/V gain with 100pF capacitive-load stability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.7V to 24V single supply - supports wide battery voltage range including deep-discharge states down to 1.35V common-mode. |
| Reference Voltage | 1.50V ±30mV (typ) - fixed internal reference enables unidirectional ADC interfacing without external components. |
| Gain Options | 50V/V or 100V/V - selected via GSEL pin; determines full-scale sense voltage (75mV or 50mV) for optimal dynamic range. |
| Total Output Error | ±1.5% max over -40°C to +85°C - includes offset and gain errors; ensures accurate current reconstruction for fuel gauging. |
| Supply Current | 100µA typical (250µA max) - enables always-on monitoring in low-power portable systems; drops to 10µA in shutdown. |
| Common-Mode Range | 1.35V to 24V - independent of supply voltage, allowing direct connection to battery packs regardless of VCC. |
| Operating Temperature | -40°C to +125°C - qualified for automotive and industrial embedded applications requiring extended thermal robustness. |
Pinout & Package
MAX4071AUA+T is housed in an 8-pin µMAX package (package code U8-1), with exposed pad not electrically connected but recommended for thermal grounding. Pin 4 is NC (no connection); all other pins are functional per datasheet Rev 4.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SHDN | Shutdown control input | Drive low to enter 10µA shutdown mode; OUT goes high-Z; connect to VCC for normal operation. |
| 2 RS- | Negative sense resistor terminal | Connects to low-side of external current-sense resistor; Kelvin routing recommended for accuracy. |
| 3 RS+ | Positive sense resistor terminal | Connects to high-side (battery/load side) of sense resistor; supports up to 24V common-mode. |
| 4 N.C. | No connection | Not internally bonded; leave unconnected on PCB. |
| 5 GND | Analog ground reference | Primary ground return; connect exposed paddle (if present) to same ground plane for thermal performance. |
| 6 REFOUT | 1.5V reference output | Provides stable 1.5V ±30mV; sources up to 500µA, sinks up to 100µA; keep capacitance ≤500pF. |
| 7 OUT | Current-proportional output | VOUT = VREF + (VRS+ − VRS-) × Gain; swings above VREF for charge, below for discharge. |
| 8 GSEL | Gain select input | Logic low → 50V/V; logic high → 100V/V; input current ≤1µA; compatible with CMOS logic levels. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional high-side sensing | Measures charge and discharge currents through single external resistor without polarity switching circuitry. |
| Integrated 1.5V reference | Eliminates need for external reference IC or resistor divider; reduces BOM count and layout complexity. |
| Selectably scalable gain | 50V/V or 100V/V via single digital pin - adapts full-scale sense voltage (75mV/50mV) to match system current range. |
| Ultra-low quiescent current | 100µA active / 10µA shutdown - extends battery life in always-on monitoring applications like smart batteries. |
| Automotive-grade temperature range | -40°C to +125°C operation - qualified for under-hood and industrial power management environments. |
| High common-mode rejection | 120dB CMRR (typ) - rejects noise from noisy battery rails, ensuring accurate current measurement in EMI-prone systems. |
Applications
| Notebook Fuel Gauging | Smart-Battery Packs/Chargers |
|---|---|
Use Scenario: Real-time estimation of remaining battery capacity in ultrabooks and 2-in-1 devices during mixed charge/discharge cycles. IC Role / Device Role / Timing Role: High-side current sensor feeding analog input of fuel-gauge MCU; outputs referenced to 1.5V for 0–3.3V ADC compatibility. Use Value: Enables <1.5% current measurement error across full battery voltage range (3.0V–12.6V), improving SOC accuracy by ≥5% vs. discrete solutions. |
Use Scenario: Bidirectional current monitoring inside sealed Li-ion battery packs with integrated protection and charging logic. IC Role / Device Role / Timing Role: Primary current-sense element in SMBus/I²C battery management subsystem; interfaces directly to host controller ADC. Use Value: 100µA supply current allows continuous monitoring without depleting standby battery; 1.5V reference simplifies level-shifting for 1.8V/3.3V host domains. |
| Cell-Phone Battery-Current Monitoring | Power-Management Systems |
Use Scenario: Accurate charge/discharge tracking in smartphones with fast-charging protocols (e.g., USB PD, Qualcomm QC). IC Role / Device Role / Timing Role: High-side monitor between battery and system PMIC; provides real-time current data to application processor for thermal throttling decisions. Use Value: 1.35V–24V common-mode range accommodates both 3.6V single-cell and 8.4V dual-cell configurations without redesign. |
Use Scenario: Current supervision in industrial DC power supplies and embedded power distribution units (PDUs). IC Role / Device Role / Timing Role: Fault-detection sensor in redundant power paths; feeds overcurrent alerts to system supervisor MCU. Use Value: 120dB CMRR suppresses switching noise from adjacent buck converters; 10µA shutdown enables fail-safe current monitoring during standby. |
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 |
|---|---|---|---|
| MAX4071ATA+ | Same electrical specs, but in 8-pin thin QFN-EP package (T833-2) with higher thermal dissipation (1951mW vs. 362mW). | Preferred for high-power-density designs requiring improved thermal performance; requires different land pattern and reflow profile. | Select MAX4071ATA+ when board space is constrained and junction temperature must stay <125°C under 200mA load. |
| MAX4070AUA+ | Identical pinout and package, but with 2.5V internal reference instead of 1.5V; otherwise identical gain, error, and supply specs. | Suitable where ADC reference is 2.5V or higher; provides larger headroom for charge-current swing (2.5V→VCC) vs. 1.5V→VCC. | Choose MAX4070AUA+ if system uses 2.5V ADC reference and requires >1V output swing for charge detection at low VCC. |
Compared with MAX4071AUA+T, MAX4071ATA+ offers superior thermal handling in compact layouts, while MAX4070AUA+ shifts the reference upward to improve charge-swing margin - neither is pin-compatible drop-in replacements, but both share identical functional behavior and interface requirements.
Availability
MAX4071AUA+T is available at Aetrix Electronics and suitable for notebook fuel gauging, smart-battery pack monitoring, and cell-phone battery-current measurement requiring stable component supply across automotive and industrial temperature ranges.
Supply support for MAX4071AUA+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 precision analog, mixed-signal, and power-management ICs for industrial, automotive, and portable applications.
The MAX4069–MAX4072 family was engineered specifically for high-accuracy, low-power bidirectional current sensing in battery-powered systems - emphasizing wide common-mode range, integrated references, and minimal quiescent current.
FAQ
What is the reference voltage accuracy of the MAX4071AUA+T over temperature?
The MAX4071AUA+T features a factory-trimmed 1.5V internal reference with ±30mV initial accuracy at +25°C and ±60mV maximum deviation over -40°C to +125°C. Its temperature coefficient is rated at 20 ppm/°C max, meaning drift remains within ±0.3mV over a 15°C change - critical for maintaining fuel-gauge linearity across operating conditions.
Can the MAX4071AUA+T measure current in both directions using a single external sense resistor?
Yes, the MAX4071AUA+T is explicitly designed for bidirectional high-side current sensing using one external resistor. When current flows from RS+ to RS-, VOUT rises above the 1.5V reference; when current reverses (RS− to RS+), VOUT falls below 1.5V - eliminating need for polarity-switching circuitry or dual sensors.
What is the maximum common-mode voltage the MAX4071AUA+T can handle, and is it supply-dependent?
The MAX4071AUA+T supports a guaranteed common-mode input range of 1.35V to 24V, and this range is fully independent of the supply voltage (2.7V to 24V). This allows direct connection to battery terminals even during deep discharge (e.g., 1.8V LiFePO₄ cells) without loss of accuracy or functionality - a key advantage over supply-referenced amplifiers.
How does the GSEL pin affect full-scale current measurement in the MAX4071AUA+T?
The GSEL pin selects gain: GSEL = GND → 50V/V → full-scale sense voltage = 75mV; GSEL = VCC → 100V/V → full-scale sense voltage = 50mV. For example, with a 10mΩ sense resistor, 50V/V gain supports 7.5A full-scale current (75mV/10mΩ), while 100V/V supports 5A (50mV/10mΩ) - enabling optimization for resolution vs. dynamic range.
Does the MAX4071AUA+T require external compensation or filtering for stable operation?
No external compensation is required. The MAX4071AUA+T is internally compensated for stability with up to 100pF capacitive load on OUT and 500pF on REFOUT. Layout best practices include short Kelvin traces to RS+/RS−, local 0.1µF VCC-to-GND bypass, and star grounding - but no RC filters or op-amp compensation networks are needed for basic operation.
MAX4071AUA+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
MAX4071AUA+T FAQ
1.How can I place an order for MAX4071AUA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4071AUA+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 MAX4071AUA+T reliable?
The price and inventory of MAX4071AUA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4071AUA+T is usually 5 days.
3.What payment methods are accepted for MAX4071AUA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4071AUA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4071AUA+T?
MAX4071AUA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4071AUA+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 MAX4071AUA+T?
For technical support, including MAX4071AUA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4071AUA+T requirements.
6.How does Aetrix verify that MAX4071AUA+T is sourced from the original manufacturer or authorized distributors?
All MAX4071AUA+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 MAX4071AUA+T meets industry standards.
7.What is the process for return or replacement of MAX4071AUA+T?
All MAX4071AUA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX4071AUA+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 MAX4071AUA+T part is unused and in its original packaging.
Return procedure for MAX4071AUA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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