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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 CURR SENSE 1 CIRCUIT 8TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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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 VCC - enabling accurate sensing during deep battery discharge in notebook fuel gauging systems.
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 bidirectional sensing behavior, real-world dynamic range constraints at ±7.5mV/±15mV full-scale inputs, and authoritative alternative part comparisons for smart-battery pack and motor-control current monitoring designs.
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 VOUT = VREF + (VRS+ − VRS−) × AV for charge (positive VSENSE) and VOUT = VREF − |(VRS+ − VRS−) × AV| for discharge (negative VSENSE).
It uses a single-ended output with polarity indication encoded in voltage swing direction - no separate sign bit or dual outputs required. The GSEL pin directly controls gain selection (GSEL = GND → 50V/V; GSEL = VCC → 100V/V), while SHDN enables 10µA shutdown mode. Input offset voltage is specified at ≤1mV over full temperature range, and CMRR exceeds 100dB across 1.35V–24V common-mode range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.7V to 24V - supports wide battery voltage ranges including Li-ion stacks and automotive 12V systems without external regulation. |
| Reference Voltage | Fixed 1.50V (±30mV over –40°C to +125°C) - sets zero-current output baseline; enables symmetric ±7.5mV (gain=100) or ±15mV (gain=50) full-scale sensing. |
| Total Output Error | ±6.0% max over temperature at ±7.5mV input, gain=100 - defines worst-case accuracy for low-current discharge detection in fuel gauging. |
| Common-Mode Input Range | 1.35V to 24V, independent of VCC - ensures valid operation even when battery voltage drops below microcontroller supply rails. |
| Supply Current | 100µA typical (250µA max) active; 10µA typical in shutdown - enables always-on current monitoring in battery-backed systems with minimal quiescent drain. |
| Gain Options | Selectable 50V/V or 100V/V via GSEL pin - allows optimization between resolution (100V/V) and dynamic range (50V/V) without changing external components. |
| Operating Temperature | –40°C to +125°C - qualified for automotive under-hood and industrial embedded environments requiring AEC-Q100 alignment. |
Pinout & Package
MAX4071ATA+T is housed in an 8-pin thin QFN package with exposed pad (T833-2), optimized for thermal performance in space-constrained portable applications. Pin 5 (GND) must be externally connected to the exposed paddle for rated power dissipation (1951mW at TA = +70°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SHDN | Shutdown control input | Drives device into 10µA standby; open or pulled high for normal operation; logic-low threshold ≤0.6V. |
| 2 RS− | Negative sense resistor terminal | Connects to low-side of external current-sense resistor; differential input with RS+; max ±0.3V differential voltage limit. |
| 3 RS+ | Positive sense resistor terminal | Connects to high-side (battery/load side) of sense resistor; supports up to 24V common-mode voltage regardless of VCC. |
| 4 GND | Analog ground reference | Primary ground return; must connect to PCB ground plane and exposed paddle on thin QFN for thermal and noise performance. |
| 5 REFOUT | 1.5V reference output | Provides stable 1.5V ±30mV reference; sources up to 500µA, sinks up to 100µA; requires <500pF load capacitance for stability. |
| 6 OUT | Current-sense output | Single-ended output swinging from VREF to VCC (charge) or VREF to GND (discharge); referenced to REFOUT for accuracy. |
| 7 VCC | Power supply input | 2.7V–24V single supply; bypass with 0.1µF capacitor to GND near pin; PSRR ≥100dB across operating range. |
| 8 GSEL | Gain select input | Configures gain: GND → 50V/V, VCC → 100V/V; input leakage ≤1µA; compatible with standard logic levels. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional high-side sensing | Measures charge and discharge currents through single external resistor without ground-path interruption or polarity switching circuitry. |
| 1.35V–24V common-mode range independent of VCC | Enables direct connection to battery terminals even when VCC is derived from regulated subsystem rail - critical for deep-discharge accuracy. |
| Integrated 1.5V reference with 20ppm/°C TC | Eliminates need for external reference IC or resistor divider; maintains ±30mV tolerance over full automotive temperature range. |
| 100µA supply current / 10µA shutdown | Supports continuous battery monitoring in always-on portable devices with negligible impact on runtime or self-discharge. |
| 8-pin thin QFN with exposed paddle | Delivers 1951mW power dissipation capability at +70°C ambient - suitable for high-current sensing in compact battery packs and chargers. |
Applications
| Notebook Fuel Gauging | Smart-Battery Packs/Chargers |
|---|---|
Use Scenario: Real-time estimation of remaining battery capacity in ultrabooks using coulomb counting. IC Role / Device Role / Timing Role: High-side current sensor feeding ADC with polarity-encoded output to distinguish charging vs. discharging states. Use Value: Enables accurate state-of-charge tracking down to 1.35V battery voltage, extending usable runtime by avoiding premature shutdown during deep discharge. |
Use Scenario: Bidirectional current monitoring inside sealed smart battery modules compliant with SMBus/BQ protocols. IC Role / Device Role / Timing Role: Primary current transducer interfacing with fuel-gauge MCU; REFOUT provides stable reference for ADC calibration. Use Value: Eliminates need for dual op-amp solutions or external references, reducing BOM count and PCB area in space-limited battery packs. |
| Motor Control | Cell-Phone Battery-Current Monitoring |
Use Scenario: Overcurrent protection and efficiency optimization in brushed DC motor drivers for portable power tools. IC Role / Device Role / Timing Role: High-side current monitor detecting stall conditions and regenerative braking currents. Use Value: Supports fast transient response (100kHz bandwidth at 50V/V gain) to trigger fault shutdown before MOSFET damage occurs. |
Use Scenario: Precise battery current profiling during fast-charging cycles and wireless power reception in smartphones. IC Role / Device Role / Timing Role: Low-quiescent current sensor enabling continuous monitoring during sleep modes and background charging. Use Value: 10µA shutdown current extends standby time; 1.5V reference simplifies ADC interface design versus ratiometric or external-ref solutions. |
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 options, and specs. | Better suited for systems with higher VCC rails where 2.5V reference improves discharge-side headroom (VREF→GND range larger). | Select MAX4070ATA+ when VCC ≥ 3.6V and wider discharge voltage swing (2.5V → GND) is needed over full battery range. |
| INA219AIDR | I²C digital output; integrated 12-bit ADC and multiplier; no internal reference; requires external VREF or ratiometric ADC. | Provides direct digital current/power/voltage readings; eliminates need for external ADC but adds firmware dependency and I²C overhead. | Choose INA219AIDR when system already uses I²C infrastructure and digital integration outweighs analog simplicity and lower quiescent current of MAX4071ATA+T. |
Compared with MAX4070ATA+, the MAX4071ATA+T offers lower reference voltage for improved low-VCC compatibility and reduced discharge-side saturation risk; compared with INA219AIDR, it delivers simpler analog interface, lower 100µA supply current, and guaranteed –40°C to +125°C operation without calibration drift.
Availability
MAX4071ATA+T is available at Aetrix Electronics and suitable for notebook fuel gauging, smart-battery pack monitoring, and motor-control current sensing requiring stable component supply across automotive and industrial temperature ranges.
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) is a semiconductor company specializing in precision analog, mixed-signal, and high-reliability ICs for power, sensing, and communication applications.
The MAX4069–MAX4072 family was designed specifically for high-accuracy, low-power bidirectional current sensing in portable and battery-powered systems - emphasizing wide common-mode range, integrated references, and robust automotive-grade operation.
FAQ
What is the reference voltage of MAX4071ATA+T and how is it used?
The MAX4071ATA+T integrates a precision 1.50V internal reference (VREF = 1.44V to 1.56V over –40°C to +125°C). This reference serves as the zero-current baseline for the output: VOUT = VREF ± (VRS+ − VRS−) × AV. During charging, VOUT rises from 1.5V toward VCC; during discharging, it falls from 1.5V toward GND - enabling unambiguous polarity detection with a single output pin. The MAX4071ATA+T does not require external reference components.
Can MAX4071ATA+T operate with a 2.7V supply and still sense at 1.35V common-mode?
Yes. The MAX4071ATA+T guarantees 1.35V to 24V input common-mode range independent of VCC. At VCC = 2.7V, it correctly measures current through RSENSE even when RS+ = 1.35V and RS− = 1.35V − VSENSE, because its input stage topology decouples common-mode rejection from supply voltage. This capability is essential for monitoring deeply discharged Li-ion batteries where cell voltage may fall below 2.0V per cell.
What are the full-scale sense voltage limits for MAX4071ATA+T at each gain setting?
At gain = 100V/V, the recommended full-scale sense voltage is ±7.5mV (±15mV absolute max); at gain = 50V/V, it is ±15mV (±30mV absolute max). These values derive from output swing limitations: with 1.5V reference, maximum usable discharge swing is ~1.5V (to GND), and maximum charge swing is VCC − 1.5V. For example, at VCC = 3.3V, ±7.5mV at 100V/V yields ±0.75V output swing - well within 1.5V/1.8V headroom.
How does shutdown mode affect the output pin of MAX4071ATA+T?
When SHDN is driven low, the MAX4071ATA+T enters shutdown mode and reduces supply current to 10µA typical. In this state, the OUT pin becomes high-impedance (tri-stated) and is effectively disconnected from the internal amplifier - preventing loading or interference with downstream ADC or signal chain. REFOUT remains active and continues sourcing/sinking current unless VCC is removed. Normal operation resumes within microseconds after SHDN returns high.
Is MAX4071ATA+T pin-compatible with other members of the MAX4069–MAX4072 family?
Yes - the MAX4071ATA+T shares identical 8-pin thin QFN pinout and function mapping with MAX4070ATA+ and MAX4072ATA+. All three use pins 1(SHDN), 2(RS−), 3(RS+), 4(GND), 5(REFOUT/REFIN), 6(OUT), 7(VCC), and 8(GSEL). However, MAX4072 replaces REFOUT with REFIN (external reference input), so direct substitution requires verifying reference source compatibility. MAX4070 and MAX4071 are fully interchangeable except for reference voltage value.
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:
- 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-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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