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Analog Devices Inc./Maxim Integrated MAX4069AUB+T
- Part No.:
- MAX4069AUB+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX4069AUB+T.pdf
- Description:
- IC CURR SENSE 1 CIRCUIT 10UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:1,957
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Product details
Overview
MAX4069AUB+T from Maxim Integrated is a bidirectional, high-side current-sense amplifier with adjustable reference voltage, designed for battery charge/discharge monitoring in portable electronics. It features 50V/V or 100V/V selectable gain, 1.35V–24V input common-mode range independent of supply, <1.5% total output error, and operates from 2.7V–24V single supply. Used in notebook fuel gauging and smart-battery packs.
For engineers reviewing the MAX4069AUB+T datasheet, MAX4069AUB+T pinout, MAX4069AUB+T application, or MAX4069AUB+T equivalent, this page delivers verified technical context, real-world design meaning for key specs, validated pin functions, confirmed alternatives, and supply-chain support tailored for battery-management system development.
Technical Context
The MAX4069AUB+T implements a BiCMOS-based high-side sensing architecture with dual matched current mirrors (RG1 = RG2 = 104kΩ typ) to maintain constant input terminal voltages across bidirectional sense currents. Its reference output (REFOUT) is adjustable via external resistor divider between REFOUT, ADJ, and GND - enabling precise VREF tuning from 1.23V to 4.0V.
Gain selection is controlled by the GSEL pin (low = 50V/V, high = 100V/V), while SHDN enables shutdown mode with 10µA quiescent current. Output voltage (OUT) swings above or below the adjusted reference to indicate polarity: VOUT > VREF for charge, VOUT < VREF for discharge - eliminating need for separate polarity outputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.7V to 24V - supports wide battery pack voltages including deeply discharged Li-ion cells without rail dependency. |
| Common-Mode Input Range | 1.35V to 24V, independent of VCC - ensures accurate sensing even when battery voltage drops below system supply. |
| Total Output Error | <±1.5% over -40°C to +125°C - guarantees precision fuel-gauge accuracy across automotive temperature range. |
| Gain Options | 50V/V or 100V/V via GSEL pin - allows optimization of sense-resistor value and ADC dynamic range for target current range. |
| Reference Output | Adjustable 1.23V to 4.0V via ADJ pin - enables matching of VREF to ADC reference or headroom requirements for full-scale swing. |
| Quiescent Current | 100µA active / 10µA shutdown - extends battery life in always-on monitoring applications like smart battery packs. |
| Operating Temperature | -40°C to +125°C - qualified for under-hood and industrial embedded use where thermal stress impacts measurement stability. |
Pinout & Package
MAX4069AUB+T is housed in a 10-pin µMAX® package (U10-2), featuring exposed-pad thermal enhancement and space-saving footprint (3mm × 5mm). Pin 1 is marked with dot; top-mark "-" per ordering table.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SHDN | Shutdown control input | Drive low to enter 10µA shutdown; connect to VCC for normal operation - enables power-aware system-level sleep control. |
| 2 RS- | Negative sense resistor terminal | Kelvin connection point for low-impedance return path - minimizes trace resistance error in high-accuracy current measurement. |
| 3 RS+ | Positive sense resistor terminal | Kelvin connection point for high-side current path - maintains common-mode integrity up to 24V regardless of VCC level. |
| 4 N.C. | No internal connection | Unbonded pin - must remain unconnected; no routing or grounding required. |
| 5 GND | Analog ground reference | Primary ground return for internal circuitry and REFOUT/ADJ - requires low-impedance star-ground connection for optimal offset performance. |
| 6 ADJ | Reference voltage feedback input | Connects to resistor divider (REFOUT–ADJ–GND) to set VREF; 100nA input bias enables high-impedance adjustment networks. |
| 7 REFOUT | Adjustable reference output | Provides stable 1.23V–4.0V reference for OUT level-shifting - sinks 100µA / sources 500µA; keep capacitance <500pF for stability. |
| 8 OUT | Bidirectional current-sense output | Voltage relative to REFOUT indicates polarity and magnitude: VOUT = VREFOUT + (VRS+−VRS−)×Gain - directly interfaces with SAR or delta-sigma ADCs. |
| 9 VCC | Power supply input | 2.7V–24V single supply; bypass with 0.1µF ceramic capacitor close to pin - powers all internal stages including reference and output amplifier. |
| 10 GSEL | Gain select input | Logic-controlled gain switch: GND = 50V/V, VCC = 100V/V - sets full-scale sense voltage to 75mV or 50mV for optimal ADC utilization. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional high-side sensing | Measures charge and discharge through single sense resistor without ground-path interruption - preserves system ground integrity in battery packs. |
| Adjustable reference voltage | VREF settable from 1.23V to 4.0V using two external resistors - enables optimal headroom allocation for both charge (VREF→VCC) and discharge (VREF→GND) ranges. |
| Selectable 50/100V/V gain | Hardware-selectable gain via GSEL pin - eliminates need for external gain-setting resistors or digital configuration, reducing BOM count and layout complexity. |
| 1.35V–24V common-mode range | Operates accurately even when RS+ is at 1.35V (e.g., 1-cell Li-ion near depletion) - avoids measurement dropout during deep discharge cycles. |
| 10µA shutdown current | Reduces system standby power in fuel-gauge ICs - critical for multi-week battery runtime in always-connected portable devices. |
| Automotive-grade temperature range | Specified from -40°C to +125°C - supports deployment in harsh environments such as automotive infotainment or industrial handhelds. |
Applications
| Notebook Fuel Gauging | Smart-Battery Packs/Chargers |
|---|---|
Use Scenario: Real-time tracking of Li-ion battery state-of-charge (SoC) 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 microcontroller; provides polarity-aware analog output synchronized to battery load transients. Use Value: Enables ±1.5% SoC accuracy over full temperature range and battery voltage swing - reduces unexpected shutdowns and improves user battery-life estimation. |
Use Scenario: Integrated current monitoring inside sealed smart battery modules compliant with SMBus or I²C battery management standards. IC Role / Device Role / Timing Role: Primary current-sense front-end for battery protection ICs; outputs conditioned analog signal representing instantaneous charge/discharge rate. Use Value: Adjustable VREF allows matching to module's internal ADC reference, maximizing SNR and minimizing firmware calibration overhead across production lots. |
| Cell-Phone Battery-Current Monitoring | Power-Management Systems |
Use Scenario: Compact current monitoring in space-constrained smartphone battery compartments, where PCB area limits discrete solution count. IC Role / Device Role / Timing Role: Bidirectional analog current monitor interfacing directly with PMIC's auxiliary ADC channel - no digital interface required. Use Value: 10-pin µMAX package (3mm × 5mm) and 100µA supply current enable integration without compromising RF isolation or thermal performance. |
Use Scenario: System-level power supervision in industrial gateways or edge AI devices requiring precise input current logging for thermal derating and fault detection. IC Role / Device Role / Timing Role: High-side current sensor upstream of DC-DC converters and LDOs - monitors total system input draw before regulation. Use Value: 24V common-mode capability supports 12V/24V industrial rails; shutdown mode enables periodic sampling to reduce average power in always-on monitoring. |
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+ | Fixed 1.5V internal reference; 8-pin µMAX; same gain select and shutdown logic. | Lacks ADJ/REFOUT adjustability - suited for designs where 1.5V reference aligns with ADC mid-scale or simplifies BOM. | Choose when reference flexibility is unnecessary and board space is constrained to 8-pin footprint. |
| INA226AIDGST | I²C digital output; integrated 16-bit ADC; fixed 0.1Ω sense resistor option; no adjustable reference. | Requires MCU firmware support for register reads; eliminates analog signal chain but adds software dependency. | Prefer for systems already using I²C infrastructure and needing calibrated digital current values without external ADC. |
Compared with MAX4071AUA+, the MAX4069AUB+T offers reference voltage programmability critical for optimizing ADC dynamic range in asymmetric charge/discharge applications; compared with INA226AIDGST, it delivers lower latency analog output and zero firmware overhead at the cost of external ADC requirement.
Availability
MAX4069AUB+T is available at Aetrix Electronics and suitable for notebook fuel gauging, smart-battery packs, and cell-phone battery-current monitoring requiring stable component supply across automotive temperature grades and long-lifecycle programs.
Supply support for MAX4069AUB+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 industrial, automotive, and computing 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, reference flexibility, and automotive-grade reliability.
FAQ
What is the function of the ADJ pin on the MAX4069AUB+T?
The ADJ pin on the MAX4069AUB+T serves as the feedback node for setting the adjustable reference voltage (VREF). By connecting a resistor divider between REFOUT, ADJ, and GND, users can program VREF from 1.23V to 4.0V. This enables precise alignment of the output swing (VOUT relative to VREF) with downstream ADC reference levels - a capability not found in fixed-reference variants like MAX4071AUA+. The MAX4069AUB+T's ADJ input draws only 100nA, supporting high-impedance resistor networks without loading error.
How does the MAX4069AUB+T handle bidirectional current sensing without separate polarity outputs?
The MAX4069AUB+T uses a single OUT pin that swings above or below its adjustable REFOUT voltage to indicate direction: VOUT > REFOUT represents charging current, while VOUT < REFOUT represents discharging current. This is achieved through internal level-shifting circuitry that references the output to the user-configured VREF. Unlike dual-output amplifiers, the MAX4069AUB+T eliminates routing complexity and ADC channel count - one analog input suffices for full bidirectional measurement. The design ensures monotonic response across the full ±75mV (gain=50) or ±50mV (gain=100) sense range.
What is the maximum allowable sense resistor value for the MAX4069AUB+T at 100V/V gain?
At 100V/V gain, the MAX4069AUB+T's recommended full-scale sense voltage is 50mV. To avoid exceeding the absolute maximum differential input voltage of ±0.3V, the peak current through the sense resistor must satisfy IPEAK ≤ 0.3V / (RSENSE + RTRACE). For typical PCB layouts with <10mΩ trace resistance, a 50mΩ sense resistor supports up to 6A full-scale current. Higher values (e.g., 100mΩ) are usable for lower-current applications but reduce dynamic range and increase IR loss - the MAX4069AUB+T's 1.5% total error specification assumes optimal resistor selection per Table 1 in the datasheet.
Can the MAX4069AUB+T operate with a 3.3V supply voltage?
Yes, the MAX4069AUB+T operates from 2.7V to 24V, making 3.3V fully supported. At 3.3V supply, the common-mode input range remains 1.35V–24V (independent of VCC), allowing connection to batteries or rails as low as 1.35V. However, the adjustable VREF must be set ≤ VCC − 1.1V per datasheet Note 4 - so at 3.3V, maximum VREF = 2.2V. Output swing is limited to VREF → 3.3V (charge) and VREF → 0V (discharge); selecting VREF ≈ 1.65V balances headroom for both directions. The MAX4069AUB+T's 100µA supply current is maintained across this range.
What package type and thermal characteristics does the MAX4069AUB+T use?
The MAX4069AUB+T uses the 10-pin µMAX® package (U10-2), measuring 3mm × 5mm with an exposed paddle for enhanced thermal dissipation. Its continuous power dissipation is rated at 444.4mW at +70°C, derating by 5.6mW/°C above that temperature. The exposed paddle must be soldered to a solid ground plane to achieve specified thermal performance - critical for sustained high-current monitoring where internal power dissipation reaches ~1.5mW at 100µA ICC. This package enables high-density placement in portable device battery compartments while maintaining automotive-grade reliability.
MAX4069AUB+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-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:
- 10-uMAX/uSOP
MAX4069AUB+T FAQ
1.How can I place an order for MAX4069AUB+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4069AUB+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 MAX4069AUB+T reliable?
The price and inventory of MAX4069AUB+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4069AUB+T is usually 5 days.
3.What payment methods are accepted for MAX4069AUB+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4069AUB+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4069AUB+T?
MAX4069AUB+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4069AUB+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 MAX4069AUB+T?
For technical support, including MAX4069AUB+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4069AUB+T requirements.
6.How does Aetrix verify that MAX4069AUB+T is sourced from the original manufacturer or authorized distributors?
All MAX4069AUB+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 MAX4069AUB+T meets industry standards.
7.What is the process for return or replacement of MAX4069AUB+T?
All MAX4069AUB+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX4069AUB+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 MAX4069AUB+T part is unused and in its original packaging.
Return procedure for MAX4069AUB+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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