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Analog Devices Inc./Maxim Integrated MAX4071ATA-T
- Part No.:
- MAX4071ATA-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
MAX4071ATA-T.pdf
- Description:
- IC CURRENT SENSE 1 CIRCUIT 8TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,006
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Product details
Overview
MAX4071ATA-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 50V/V or 100V/V gain via GSEL pin, delivers <1.5% total output error over –40°C to +125°C, and features 1.35V–24V input common-mode range independent of supply voltage - enabling accurate sensing even during deep battery discharge.
For engineers reviewing the MAX4071ATA-T datasheet, MAX4071ATA-T pinout, MAX4071ATA-T application, or MAX4071ATA-T equivalent, this page provides verified technical context, validated pin functions, confirmed automotive-grade operating range (–40°C to +125°C), real-world dynamic range constraints for bidirectional output swing (REFOUT to GND and REFOUT to VCC), and documented alternative options with explicit functional and application-level differences.
Technical Context
The MAX4071ATA-T implements a BiCMOS-based high-side current-sense architecture with matched internal resistor networks (RG1 = RG2 = 104kΩ typ) that maintain constant input terminal voltages across bidirectional sense currents. Its output stage level-shifts relative to the fixed 1.5V internal reference, producing OUT = REFOUT ± (VRS+ − VRS−) × Gain - enabling polarity detection without separate outputs.
It uses a dedicated GSEL pin to configure gain (GSEL = GND → 50V/V; GSEL = VCC → 100V/V) and SHDN pin to reduce supply current from 100µA to 10µA in shutdown. The 8-pin thin QFN-EP package includes an exposed paddle tied to GND for thermal performance, and all pins are specified for operation up to +125°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.7V to 24V single supply - supports wide battery voltage ranges including Li-ion, multi-cell packs, and 12V automotive systems. |
| Reference Voltage | Fixed 1.44V to 1.56V (–40°C to +125°C) - enables precise zero-current baseline for bidirectional output swing centered at 1.5V. |
| Common-Mode Input Range | 1.35V to 24V, independent of VCC - ensures accuracy when sensing across deeply discharged batteries (e.g., 1.8V cell) while powered from higher rail. |
| Total Output Error | ±6.0% max over full temp range at 100V/V gain, –7.5mV sense - defines worst-case deviation between measured current and ADC-converted value in production systems. |
| Gain Select Logic | GSEL = GND → 50V/V; GSEL = VCC → 100V/V - allows hardware-configurable sensitivity without firmware changes or external resistors. |
| Shutdown Current | 10µA max at 24V - enables ultra-low-power state for fuel-gauge subsystems during system sleep modes. |
| PSRR / CMRR | 100dB min PSRR and 100dB min CMRR - rejects supply noise and common-mode transients critical in noisy battery-charger environments. |
Pinout & Package
MAX4071ATA-T is housed in an 8-pin thin QFN-EP package (3mm × 3mm, 0.5mm pitch) with exposed paddle thermally and electrically connected to GND. Pin 5 is GND; Pin 1 is SHDN; Pins 2 and 3 are RS− and RS+, respectively; Pin 4 is unused (N.C.); Pin 6 is OUT; Pin 7 is REFOUT; Pin 8 is GSEL; VCC is on Pin 5 (shared with GND pad connection per layout guidelines).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SHDN (Pin 1) | Active-low shutdown control | Pulling low disables output (high-Z) and reduces ICC to ≤10µA - used for power gating in battery-fuel-gauge ICs. |
| RS− (Pin 2) | Negative sense resistor terminal | Connects to load side of external RSENSE - forms Kelvin sense path with RS+ to reject trace resistance errors. |
| RS+ (Pin 3) | Positive sense resistor terminal | Connects to battery/charger side of RSENSE - differential input pair measures VRS+ − VRS− with 0.3V max differential limit. |
| N.C. (Pin 4) | No internal connection | Must be left unconnected or tied to GND - no electrical function; avoids unintended coupling in high-noise layouts. |
| GND (Pin 5 + EP) | Ground reference and thermal pad | Exposed paddle must be soldered to PCB ground plane for rated 1951mW dissipation and stable REFOUT performance. |
| OUT (Pin 6) | Bidirectional analog output | Voltage swings from REFOUT to GND (discharge) or REFOUT to VCC (charge) - directly interfaces with 12-bit+ SAR ADCs. |
| REFOUT (Pin 7) | Fixed 1.5V reference output | Stable 1.44V–1.56V over temp; sources/sinks ±500µA - serves as ADC reference or level-shift center for OUT. |
| GSEL (Pin 8) | Gain configuration input | Logic-controlled selection between 50V/V (low) and 100V/V (high) - sets full-scale sense voltage to 75mV or 50mV respectively. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional high-side sensing | Measures charge and discharge currents through single RSENSE without ground-path interruption - preserves system ground integrity in smart-battery packs. |
| 1.5V internal reference | Guaranteed 1.44V–1.56V over –40°C to +125°C with 20ppm/°C TC - eliminates need for external reference IC in space-constrained portable designs. |
| Selectable 50/100V/V gain | Hardware-selectable via GSEL pin - enables optimization of RSENSE value and ADC dynamic range without redesigning feedback network. |
| 1.35V–24V common-mode range | Operates accurately even when RS+ is at 1.35V (e.g., single LiFePO₄ cell at EOD) while VCC is at 12V - critical for multi-chemistry battery management. |
| 100µA supply current | Enables continuous fuel gauging in always-on systems (e.g., notebook standby) with minimal impact on battery runtime. |
Applications
| Notebook Fuel Gauging | Smart-Battery Packs/Chargers |
|---|---|
Use Scenario: Real-time battery charge/discharge current tracking in ultrabooks with dual-cell Li-ion packs under variable load (CPU burst, display backlight, USB-C PD). IC Role / Device Role / Timing Role: High-side current sensor providing bidirectional analog output referenced to 1.5V - feeds into microcontroller ADC for coulomb counting and state-of-charge estimation. Use Value: Enables <1.5% current measurement error across full battery voltage range (3.0V–8.4V), supporting accurate runtime prediction down to 1% remaining capacity. | Use Scenario: Embedded fuel gauge in removable smart battery packs compliant with SMBus v1.1, requiring autonomous current monitoring without host intervention. IC Role / Device Role / Timing Role: Standalone current-sense front-end with shutdown mode - autonomously tracks charge cycles and reports accumulated Ah to host via SMBus. Use Value: 10µA shutdown current extends self-discharge monitoring capability for >6 months on pack's internal coin cell, meeting JEITA EG-1001 shelf-life requirements. |
| Cell-Phone Battery-Current Monitoring | Power-Management Systems |
Use Scenario: Compact current sensing in flagship smartphones with 4500mAh batteries, where PCB area limits use of discrete op-amp + reference solutions. IC Role / Device Role / Timing Role: Integrated current-sense amplifier with 1.5V reference - replaces 3-component discrete solution, reducing BOM count and layout complexity. Use Value: 3mm × 3mm thin QFN-EP footprint saves >25mm² vs. µMAX alternative, enabling placement adjacent to battery connector with minimal trace inductance. | Use Scenario: System-level power supervision in industrial handhelds with hot-swappable batteries and multiple regulated rails (3.3V, 1.8V, 1.2V). IC Role / Device Role / Timing Role: Primary current monitor feeding PMIC telemetry bus - provides real-time load profiling for adaptive power budgeting and thermal throttling. Use Value: 100dB PSRR ensures clean current readings despite switching noise from DC-DC converters, preventing false overcurrent triggers during transient load steps. |
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 |
|---|---|---|---|
| MAX4070ATA+ | Fixed 2.5V internal reference; requires ≥3.6V supply; otherwise identical pinout, gain select, and error specs. | Suitable where higher reference voltage improves ADC headroom (e.g., 3.3V ADC with 2.5V VREF), but incompatible with 2.7V–3.3V-only systems. | Select MAX4070ATA+ only if system VCC ≥ 3.6V and 2.5V REFOUT better matches ADC reference or simplifies level-shifting. |
| INA219BIDR | I²C digital output; internal 0.1Ω shunt; 12-bit ADC; no external RSENSE needed; 2.7V–5.5V supply only. | Replaces analog signal chain with digital telemetry - eliminates need for external ADC but adds firmware dependency and limits bandwidth to 1kHz max. | Choose INA219BIDR for cost-sensitive, low-complexity designs where I²C interface and integrated ADC outweigh need for >1kHz sampling or 24V common-mode support. |
Compared with MAX4070ATA+, MAX4071ATA-T offers lower reference voltage (1.5V vs. 2.5V) enabling wider discharge-range output swing in 2.7V–3.3V systems, while INA219BIDR trades analog flexibility and 24V common-mode capability for integrated digitization and simplified BOM - making each suitable for distinct architectural priorities.
Availability
MAX4071ATA-T is available at Aetrix Electronics and suitable for notebook fuel gauging, smart-battery pack development, and cell-phone battery-current monitoring requiring stable component supply across automotive-grade temperature ranges and long product lifecycles.
Supply support for MAX4071ATA-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 and mixed-signal ICs for power, sensing, and connectivity applications in industrial, automotive, and portable markets.
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 shutdown efficiency to extend runtime in fuel-gauge and charger IC subsystems.
FAQ
What is the exact reference voltage tolerance and temperature drift of the MAX4071ATA-T?
The MAX4071ATA-T provides a fixed 1.5V internal reference with guaranteed 1.44V to 1.56V output over –40°C to +125°C, corresponding to ±4% initial tolerance. Its temperature coefficient is 20ppm/°C max across the full automotive temperature range, meaning output drift is limited to ±0.003V over a 150°C span - critical for maintaining consistent zero-current baseline in fuel-gauge algorithms.
Can the MAX4071ATA-T operate with a 2.7V supply while sensing a 1.35V common-mode voltage?
Yes, the MAX4071ATA-T fully supports 2.7V supply operation while measuring common-mode voltages as low as 1.35V - a key specification confirmed in its Electrical Characteristics table. This capability enables accurate current sensing in deeply discharged single-cell LiFePO₄ or NiMH batteries where the pack voltage falls below 2.0V, without requiring level-shifting circuitry or supply boosting.
How does the MAX4071ATA-T handle bidirectional current polarity detection without separate outputs?
The MAX4071ATA-T uses a single OUT pin referenced to its internal 1.5V REFOUT: when current flows from RS+ to RS− (charge), OUT rises from 1.5V toward VCC; when current reverses (discharge), OUT falls from 1.5V toward GND. This unipolar-to-bipolar mapping eliminates need for dual-output amplifiers or external comparators - simplifying ADC interfacing and reducing component count in compact battery monitors.
What is the maximum allowable differential input voltage across RS+ and RS− for the MAX4071ATA-T?
The MAX4071ATA-T specifies ±0.3V absolute maximum differential input voltage (VRS+ − VRS−) to protect internal back-to-back diodes. This limits full-scale sense voltage to 75mV at 50V/V gain or 50mV at 100V/V gain - defining the upper bound for RSENSE selection. Exceeding ±0.3V risks permanent damage and invalidates guaranteed error specifications.
Is the exposed paddle on the MAX4071ATA-T's thin QFN package electrically connected, and how must it be handled in layout?
Yes, the exposed paddle on the MAX4071ATA-T's 8-pin thin QFN-EP package is internally connected to GND and must be soldered to a PCB ground plane. Per Maxim's Package Information, this connection is required to achieve rated 1951mW power dissipation at +70°C ambient and to stabilize REFOUT performance. Floating or unconnected paddle causes thermal derating and potential reference drift.
MAX4071ATA-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-WDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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-TDFN (3x3)
MAX4071ATA-T FAQ
1.How can I place an order for MAX4071ATA-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4071ATA-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 MAX4071ATA-T reliable?
The price and inventory of MAX4071ATA-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4071ATA-T is usually 5 days.
3.What payment methods are accepted for MAX4071ATA-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4071ATA-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4071ATA-T?
MAX4071ATA-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4071ATA-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 MAX4071ATA-T?
For technical support, including MAX4071ATA-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4071ATA-T requirements.
6.How does Aetrix verify that MAX4071ATA-T is sourced from the original manufacturer or authorized distributors?
All MAX4071ATA-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 MAX4071ATA-T meets industry standards.
7.What is the process for return or replacement of MAX4071ATA-T?
All MAX4071ATA-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX4071ATA-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 MAX4071ATA-T part is unused and in its original packaging.
Return procedure for MAX4071ATA-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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