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Analog Devices Inc./Maxim Integrated MAX4070ATA-T
- Part No.:
- MAX4070ATA-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
MAX4070ATA-T.pdf
- Description:
- IC CURRENT SENSE 1 CIRCUIT 8TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,100
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Product details
Overview
MAX4070ATA-T from Maxim Integrated is a bidirectional, high-side current-sense amplifier with integrated 2.5V precision reference, designed for battery charge/discharge monitoring in portable electronics. It operates from 3.6V to 24V supply, supports 50V/V or 100V/V selectable 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 MAX4070ATA-T datasheet, MAX4070ATA-T pinout, MAX4070ATA-T application, or MAX4070ATA-T equivalent, key selection criteria include its fixed 2.5V internal reference, thin QFN-EP package (8-pin), shutdown current of 10µA, ±50mV/±75mV full-scale sense voltage compatibility, and suitability for fuel gauging, smart-battery packs, and motor control systems requiring bidirectional current feedback without polarity switching.
Technical Context
The MAX4070ATA-T uses a proprietary high-side current-sensing topology with matched internal resistor networks (RG1 = RG2 = 104kΩ typ) to maintain constant input terminal voltages across RSENSE, enabling precise bidirectional measurement regardless of current direction. Its output (OUT) is level-shifted relative to the internal 2.5V reference (REFOUT), producing VOUT = 2.5V to VCC for charging and 2.5V to GND for discharging.
Gain selection is implemented via a logic-level GSEL pin (0V = 50V/V, VCC = 100V/V), while SHDN enables low-power shutdown (10µA). The device's common-mode rejection ratio exceeds 100dB and PSRR exceeds 100dB, ensuring robust operation in noisy power-rail environments typical of battery-powered systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 3.6V to 24V - ensures compatibility with Li-ion, multi-cell, and wide-input portable power rails without external regulation. |
| Input Common-Mode Range | 1.35V to 24V - remains functional even when battery voltage drops below 2V, critical for deep-discharge fuel gauging. |
| Total Output Error | <±1.5% over –40°C to +85°C - guarantees reliable current measurement accuracy across industrial temperature range. |
| Gain Options | 50V/V or 100V/V - selected by GSEL pin; enables optimal dynamic range for either high-current (e.g., 75mV full-scale) or high-resolution (e.g., 50mV full-scale) sensing. |
| Reference Voltage | 2.50V ±20mV (–40°C to +125°C) - stable internal reference eliminates need for external voltage source and simplifies ADC interfacing. |
| Supply Current | 100µA active / 10µA shutdown - extends battery life in always-on monitoring applications such as smart battery packs. |
| Operating Temperature | –40°C to +125°C - qualified for automotive and industrial embedded use where thermal stress is significant. |
Pinout & Package
MAX4070ATA-T is housed in an 8-pin thin QFN package with exposed paddle (EP), optimized for thermal performance and space-constrained PCB layouts. The exposed paddle must be connected to GND for rated power dissipation (1951mW at TA = +70°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SHDN | Shutdown control input | Logic-low disables amplifier and reduces ICC to 10µA; requires pull-up to VCC for normal operation. |
| 2 RS− | Negative sense resistor terminal | Kelvin connection point for low-impedance return path; must be routed with minimal trace resistance for accuracy. |
| 3 RS+ | Positive sense resistor terminal | Kelvin connection point for high-side current sensing; maintains 1.35V–24V common-mode tolerance. |
| 4 NC | No connection | Not internally bonded; leave unconnected and unpopulated on PCB. |
| 5 GND | Analog/digital ground | Primary ground reference; must connect to exposed paddle and system star ground for best noise immunity. |
| 6 REFOUT | 2.5V reference output | Stable 2.5V source for OUT level-shifting; can source 500µA or sink 100µA; keep capacitance <500pF. |
| 7 OUT | Current-sense output | Voltage output referenced to REFOUT: 2.5V–VCC for charge, 2.5V–GND for discharge; drives ADC directly. |
| 8 GSEL | Gain select input | Logic-controlled gain: GND = 50V/V, VCC = 100V/V; input current <1µA allows simple resistor pull-up/down. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional high-side sensing | Measures both charge and discharge currents through single external resistor without polarity-switching circuitry. |
| Internal 2.5V reference | Eliminates external reference IC or resistor divider, reducing BOM count and layout complexity in battery-fuel-gauge designs. |
| Selectable gain (50/100V/V) | Enables flexible full-scale optimization: 75mV sense voltage at 50× gain or 50mV at 100× gain - matching ADC input range. |
| 1.35V–24V common-mode range | Operates accurately even when battery voltage falls below microcontroller supply rails - essential for end-of-life detection. |
| 10µA shutdown current | Extends standby time in always-connected devices like IoT battery monitors or smart chargers with periodic wake-up. |
Applications
| Smart-Battery Packs/Chargers | Notebook Fuel Gauging |
|---|---|
Use Scenario: Real-time monitoring of charge/discharge cycles in sealed Li-ion battery packs with integrated protection and communication ICs. IC Role / Device Role / Timing Role: High-side current-sense amplifier providing bidirectional analog output to fuel-gauge MCU or SMBus controller. Use Value: Enables precise coulomb counting and state-of-charge estimation using only one sense resistor and no polarity-reversal switches. | Use Scenario: Accurate battery capacity tracking in ultrabooks and 2-in-1 laptops during mixed-use patterns (AC charging, USB-C PD, discharge under load). IC Role / Device Role / Timing Role: Primary current sensor feeding ADC input of embedded fuel-gauge IC (e.g., MAX17048) with 2.5V-referenced bipolar output. Use Value: Delivers <±1.5% error over full temperature range, improving runtime prediction accuracy by >5% versus lower-precision alternatives. |
| Motor Control | Power-Management Systems |
Use Scenario: Current feedback for brushed DC or BLDC motor drivers in portable power tools and medical pumps. IC Role / Device Role / Timing Role: High-side current monitor placed between battery and H-bridge, delivering fast-response analog feedback to PWM controller. Use Value: 40kHz bandwidth at 100V/V gain supports real-time overcurrent protection with sub-100µs response to fault conditions. | Use Scenario: System-level current supervision in multi-rail PMIC-based platforms (e.g., FPGA SoM, edge AI modules). IC Role / Device Role / Timing Role: Dedicated rail monitor for main battery input, reporting to system supervisor MCU via ADC. Use Value: Independent 1.35V–24V common-mode operation allows direct connection to battery input without level-shifting, reducing component count. |
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 |
|---|---|---|---|
| MAX4070AUA+ | Same electrical specs but in 8-pin µMAX package (no exposed paddle); 362mW max power dissipation vs. 1951mW for QFN-EP. | Preferred for prototyping or low-power designs where thermal load is minimal and board space less constrained. | Select MAX4070AUA+ when thermal management is not critical and µMAX footprint is already established in design. |
| INA219BIDR | Integrated 12-bit ADC, I²C interface, and programmable gain (up to 320V/V); no internal reference; 2.7V–5.5V supply only. | Suitable for digital-output systems needing bus communication and auto-ranging, but incompatible with 12V+ battery rails. | Choose INA219BIDR only for low-voltage (≤5.5V), digitally managed systems where ADC integration outweighs analog flexibility. |
Compared with MAX4070AUA+, the MAX4070ATA-T offers superior thermal performance and higher power handling due to its QFN-EP package, while compared with INA219BIDR, it provides wider supply and common-mode ranges essential for direct high-voltage battery monitoring without level-shifting.
Availability
MAX4070ATA-T is available at Aetrix Electronics and suitable for notebook fuel gauging, smart-battery packs/chargers, and motor control applications requiring stable component supply, automotive-grade temperature performance, and high-side bidirectional current sensing.
Supply support for MAX4070ATA-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, automotive, and portable applications.
The MAX4069–MAX4072 family was engineered specifically for high-accuracy, low-power, bidirectional battery current monitoring - addressing the need for compact, reference-integrated solutions in space- and energy-constrained portable systems.
FAQ
What is the operating supply voltage range for the MAX4070ATA-T?
The MAX4070ATA-T operates from 3.6V to 24V single supply. This range is defined by its internal 2.5V reference architecture, which requires minimum headroom above the reference voltage. Operation below 3.6V is not guaranteed and may result in REFOUT instability or reduced output swing - unlike the MAX4071, which supports 2.7V due to its 1.5V reference.
Does the MAX4070ATA-T require external components for basic operation?
Yes, the MAX4070ATA-T requires an external current-sense resistor (RSENSE) and a 0.1µF bypass capacitor from VCC to GND. No external reference or gain-setting resistors are needed - the 2.5V reference and gain selection (via GSEL pin) are fully integrated. The REFOUT pin may be loaded up to 500µA but must remain unterminated or buffered if driving capacitive loads exceeding 500pF.
How does the MAX4070ATA-T indicate current direction?
The MAX4070ATA-T indicates current direction through its OUT pin voltage relative to REFOUT: when current flows from RS+ to RS− (charging), VOUT rises from 2.5V toward VCC; when current flows from RS− to RS+ (discharging), VOUT falls from 2.5V toward GND. This bipolar output eliminates need for separate polarity-detection circuitry or dual-output amplifiers.
What is the maximum allowable differential input voltage across RS+ and RS− for the MAX4070ATA-T?
The absolute maximum differential input voltage (VRS+ − VRS−) for the MAX4070ATA-T is ±0.3V. Exceeding this risks forward-biasing internal back-to-back diodes and causing permanent damage. For full-scale sensing, recommended values are ±50mV (at 100V/V gain) or ±75mV (at 50V/V gain), ensuring operation well within safe limits while maximizing signal-to-noise ratio.
Can the MAX4070ATA-T be used in automotive applications?
Yes, the MAX4070ATA-T is specified over the full automotive temperature range (–40°C to +125°C) and qualified for use in automotive subsystems including battery management modules, infotainment power supplies, and ADAS auxiliary power monitoring. Its 24V absolute maximum rating, high CMRR (>100dB), and robust shutdown mode meet key requirements for under-hood and cabin-mounted electronics.
MAX4070ATA-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):
- 3.6 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)
MAX4070ATA-T FAQ
1.How can I place an order for MAX4070ATA-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4070ATA-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 MAX4070ATA-T reliable?
The price and inventory of MAX4070ATA-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4070ATA-T is usually 5 days.
3.What payment methods are accepted for MAX4070ATA-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4070ATA-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4070ATA-T?
MAX4070ATA-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4070ATA-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 MAX4070ATA-T?
For technical support, including MAX4070ATA-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4070ATA-T requirements.
6.How does Aetrix verify that MAX4070ATA-T is sourced from the original manufacturer or authorized distributors?
All MAX4070ATA-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 MAX4070ATA-T meets industry standards.
7.What is the process for return or replacement of MAX4070ATA-T?
All MAX4070ATA-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX4070ATA-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 MAX4070ATA-T part is unused and in its original packaging.
Return procedure for MAX4070ATA-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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