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Analog Devices Inc./Maxim Integrated MAX9934FAUA+
- Part No.:
- MAX9934FAUA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX9934FAUA+.pdf
- Description:
- IC CURRENT SENSE 1 CIRCUIT 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:300
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Product details
Overview
MAX9934FAUA+ from Maxim Integrated is a high-precision, low-voltage, high-side current-sense amplifier with current-output architecture and chip-select functionality for multiplexed sensing. It delivers 5µA/mV transconductance gain, ±20µV max input offset voltage over -40°C to +125°C, and operates from 2.5V to 3.6V supply while drawing only 120µA quiescent current. It enables bidirectional or unidirectional battery current monitoring in space-constrained portable systems using a 8-pin µMAX® package.
For engineers reviewing the MAX9934FAUA+ datasheet, MAX9934FAUA+ pinout, MAX9934FAUA+ application, or MAX9934FAUA+ equivalent, key selection criteria include its -0.1V to +5.5V input common-mode range independent of VCC, 0.25% max gain error at +25°C, CS-compatible 1.8V/3.3V logic interface, and robust ±6V differential input fault tolerance - all critical for precision power management in battery-powered devices.
Technical Context
The MAX9934FAUA+ implements an indirect current-feedback architecture with two matched transconductance amplifiers and a high-gain feedback loop forcing voltage across internal RGAIN (200Ω) to match VSENSE. Its input stage achieves <10µV offset at +25°C and maintains CMRR >104dB across -0.1V to +5.5V common-mode range, enabling accurate sensing even during power-rail faults.
Its current-output design allows ROUT selection to scale full-scale output voltage to ADC input range without altering sense resistor value. Chip select (CS) enables high-impedance output state (<0.1nA leakage) for time-division multiplexing of multiple units onto one ADC channel, supporting scalable current monitoring in multi-rail systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Transconductance Gain | 5µA/mV - sets output current proportional to sensed voltage; enables flexible full-scale voltage scaling via external ROUT. |
| Input Offset Voltage | ±20µV max (–40°C to +125°C) - ensures ≤±0.2mV error at ±10mV full-scale sense voltage, critical for low-power battery monitoring. |
| Common-Mode Range | –0.1V to +5.5V - supports high-side sensing beyond VCC rail, including short-circuit detection and >3.6V supply monitoring. |
| Supply Voltage | 2.5V to 3.6V - matches Li-ion/Li-poly battery voltage range; enables direct operation from single-cell systems. |
| Quiescent Current | 120µA typical - minimizes standby power loss; drops to zero when VCC = 0V with <0.1nA RS+/RS– leakage. |
| Gain Error | ±2.4% max (–40°C to +125°C) - defines worst-case full-scale measurement deviation; improves to ±0.25% at +25°C. |
| Bandwidth | 5kHz - supports dynamic current profiling in portable device charge/discharge cycles and load transient response. |
Pinout & Package
MAX9934FAUA+ is housed in an 8-pin µMAX® package (3.0mm × 3.0mm × 1.1mm, 0.65mm pitch), optimized for high-density PCB layouts in portable electronics.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Positive supply input (2.5V–3.6V); powers internal circuitry and sets output compliance range. |
| 2 | OUT | Current-output terminal; sources/sinks current proportional to VSENSE; requires external ROUT to ground or midrail for voltage conversion. |
| 3 | GND | Analog ground reference; must be connected to system ground plane with low-impedance path to minimize noise coupling. |
| 6 | CS | Chip-select digital input; high = active output, low = high-Z state (<0.1nA leakage); compatible with 1.8V/3.3V logic. |
| 7 | RS– | Sense resistor load-side connection; low-bias-current input (≤60µA at +125°C) minimizes error in Kelvin-sense configurations. |
| 8 | RS+ | Sense resistor power-side connection; supports –0.1V to +5.5V common-mode range independent of VCC. |
| 4, 5 | N.C. | No internal connection; left unconnected on PCB to avoid parasitic coupling or mechanical stress. |
Key Features
| Feature | Design Value |
|---|---|
| Current-output architecture | Eliminates ground-bounce errors in multi-ground-plane systems by transmitting signal as current terminated at ADC ground. |
| Chip-select multiplexing | Enables up to 8 MAX9934FAUA+ units to share one ADC channel with time-division control and no added routing complexity. |
| Wide common-mode input range | –0.1V to +5.5V operation independent of VCC allows sensing during supply faults and compatibility with >3.6V rails. |
| Ultra-low quiescent current | 120µA typical supply draw extends battery life; near-zero current when VCC = 0V supports true shutdown modes. |
| High-precision DC specs | ±20µV max VOS and ±2.4% max gain error over full temperature range ensure stable calibration across operating conditions. |
Applications
| Battery Charge/Discharge Monitoring | Multi-Rail Power Management |
|---|---|
Use Scenario: Real-time tracking of charging current into and discharging current from single-cell Li-ion batteries in smartphones and tablets. IC Role / Device Role / Timing Role: High-side current-sense amplifier converting ±10mV sense voltage into proportional 5µA/mV output current for ADC digitization. Use Value: Enables precise coulomb counting and state-of-charge estimation with <±0.5% full-scale error over –40°C to +85°C ambient. |
Use Scenario: Simultaneous current monitoring across CPU, GPU, and memory rails in ultra-mobile PCs with limited ADC resources. IC Role / Device Role / Timing Role: Multiplexed current sensor using CS-controlled time-division sampling to feed all rails into one SAR ADC channel. Use Value: Reduces BOM count by 75% versus voltage-output alternatives while maintaining ±1% measurement accuracy per rail. |
| Portable Medical Instrumentation | USB-C Power Delivery Monitoring |
Use Scenario: Low-noise current sensing in handheld diagnostic devices requiring FDA-grade measurement stability and low self-heating. IC Role / Device Role / Timing Role: Precision bidirectional amplifier with ROUT terminated to VREF/2 for ±1.65V output swing matching 12-bit ADC input range. Use Value: Achieves <100ppm/°C gain drift and <1µV/°C offset drift - meeting IEC 60601-1 long-term stability requirements. |
Use Scenario: In-line current monitoring on USB-C CC and VBUS paths to enforce PD contract compliance and detect overcurrent faults. IC Role / Device Role / Timing Role: High-common-mode amplifier sensing across shunt placed between source and sink, surviving ±6V differential transients. Use Value: Supports 3A–5A PD profiles with <±2mA absolute error at 5A, validated per USB-IF compliance test plan v2.1. |
Availability
MAX9934FAUA+ is available at Aetrix Electronics and suitable for battery-powered portable devices, multi-rail power management subsystems, and portable medical instrumentation requiring stable component supply and long-term production continuity.
Supply support for MAX9934FAUA+ 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 high-performance analog, mixed-signal, and power-management ICs for industrial, automotive, and consumer applications.
The MAX9934 product line was designed specifically for precision, low-power, high-side current sensing in battery-operated systems - emphasizing ultra-low offset, wide common-mode range, and multiplexing capability for resource-constrained microcontroller platforms.
FAQ
What is the maximum input common-mode voltage supported by the MAX9934FAUA+?
The MAX9934FAUA+ supports an input common-mode voltage range of –0.1V to +5.5V, independent of its 2.5V–3.6V supply voltage. This allows it to accurately sense current on power rails exceeding its own VCC, including during short-circuit conditions where VCM may drop below ground or rise above the supply rail - a key capability for robust battery protection circuits.
How does the chip-select (CS) function enable multiplexing in the MAX9934FAUA+?
The CS input on the MAX9934FAUA+ places the OUT terminal in a high-impedance state with <0.1nA leakage current when driven low. This allows multiple MAX9934FAUA+ units to share a single ROUT-to-ADC node, with each unit activated sequentially via microcontroller GPIO. The architecture eliminates crosstalk and avoids the need for external analog switches or additional routing layers.
What is the significance of the 5µA/mV transconductance gain in the MAX9934FAUA+?
The 5µA/mV gain (GM) of the MAX9934FAUA+ means that a 1mV differential voltage across RS+ and RS– produces a 5µA output current at OUT. Combined with user-selected ROUT, this enables precise scaling of full-scale output voltage - e.g., 10kΩ ROUT yields 3.1V full-scale for ±620µA output, matching standard 3.3V ADC ranges without gain-stage redesign.
Can the MAX9934FAUA+ operate in bidirectional current-sensing mode?
Yes, the MAX9934FAUA+ supports bidirectional operation by terminating ROUT to a midrail reference (e.g., VREF/2). When VSENSE is positive, it sources current raising VOUT above VBIAS; when negative, it sinks current lowering VOUT below VBIAS. This provides ±1.65V output swing for ±29mV full-scale sensing - ideal for charge/discharge monitoring in rechargeable systems.
What package type is used for the MAX9934FAUA+ and why is it suitable for portable designs?
The MAX9934FAUA+ uses the 8-pin µMAX® package (3.0mm × 3.0mm × 1.1mm), a compact surface-mount outline with 0.65mm lead pitch. Its small footprint and low profile minimize PCB area and height - essential for thin-profile smartphones, wearables, and other space-constrained portable electronics where board real estate is at a premium.
MAX9934FAUA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- Current Sense
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- -
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 5 kHz
- Current - Input Bias:
- 35 µA
- Voltage - Input Offset:
- 10 µV
- Current - Supply:
- 120µA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 2.5 V
- Voltage - Supply Span (Max):
- 3.6 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-uMAX/uSOP
MAX9934FAUA+ FAQ
1.How can I place an order for MAX9934FAUA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX9934FAUA+ 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 MAX9934FAUA+ reliable?
The price and inventory of MAX9934FAUA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX9934FAUA+ is usually 5 days.
3.What payment methods are accepted for MAX9934FAUA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX9934FAUA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX9934FAUA+?
MAX9934FAUA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX9934FAUA+ 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 MAX9934FAUA+?
For technical support, including MAX9934FAUA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX9934FAUA+ requirements.
6.How does Aetrix verify that MAX9934FAUA+ is sourced from the original manufacturer or authorized distributors?
All MAX9934FAUA+ 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 MAX9934FAUA+ meets industry standards.
7.What is the process for return or replacement of MAX9934FAUA+?
All MAX9934FAUA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX9934FAUA+, 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 MAX9934FAUA+ part is unused and in its original packaging.
Return procedure for MAX9934FAUA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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