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Analog Devices Inc./Maxim Integrated MAX9934FART+T
- Part No.:
- MAX9934FART+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 6-WFBGA, CSPBGA
- Datasheet:
-
MAX9934FART+T.pdf
- Description:
- IC CURR SENSE 1 CIRCUIT 6UCSP
- Quantity:
- Payment:
- Shipping:
Inventory:52,500
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Product details
Overview
MAX9934FART+T from Maxim Integrated is a high-precision, low-voltage, high-side current-sense amplifier with current-output architecture and chip-select (CS) 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–3.6V supply. Designed for bidirectional or unidirectional battery current monitoring in space-constrained portable electronics, it enables accurate ±10mV full-scale sensing with minimal power loss.
For engineers reviewing the MAX9934FART+T datasheet, MAX9934FART+T pinout, MAX9934FART+T application, or MAX9934FART+T equivalent, key selection criteria include its 6-bump UCSP package (1mm × 1.5mm × 0.6mm), CS-enabled multiplexing capability, current-output flexibility via ROUT selection, and robust ±6V differential input fault tolerance - all critical for compact, multi-rail power management in smartphones and ultra-mobile PCs.
Technical Context
The MAX9934FART+T implements an indirect current-feedback architecture with two matched transconductance amplifiers and a high-gain feedback loop forcing voltage across internal RGAIN (200Ω for F-version) to equal VSENSE. Its input common-mode range spans -0.1V to +5.5V independent of VCC, enabling high-side sensing even during supply rail faults or short-circuit conditions.
Chip select (CS) controls output enable/disable with <0.1nA leakage when deselected, supporting time-division multiplexing of multiple units onto one ADC channel. Output settling time is 220µs (0.1% final value), and power-up/power-down times are 200µs/2µs respectively - optimized for dynamic load monitoring in battery-powered systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Transconductance Gain (GM) | 5µA/mV - sets output current scaling for precise low-VSENSE operation (e.g., ±10mV full-scale) |
| Input Offset Voltage (VOS) | ±20µV max (–40°C to +125°C) - enables sub-1mA current resolution with 50mΩ sense resistor |
| Common-Mode Input Range | –0.1V to +5.5V - allows sensing above VCC (e.g., 5V rail monitoring with 3.3V supply) |
| Supply Voltage Range | 2.5V to 3.6V - compatible with single-cell Li-ion and regulated 3.3V system rails |
| Quiescent Current | 120µA typical - minimizes standby power draw in always-on battery monitoring circuits |
| Differential Input Fault Tolerance | ±6V - protects against transient overvoltage on RS+/RS– during load dump or hot-swap events |
| Operating Temperature | –40°C to +125°C - qualified for automotive cabin and industrial embedded environments |
Pinout & Package
MAX9934FART+T is housed in a 6-bump UCSP package (1.0mm × 1.5mm × 0.6mm), optimized for ultra-dense PCB layouts in portable devices. The bump mapping follows standard UCSP pinout with no internal connections on unused pads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Bump A1) | Power supply input | Accepts 2.5V–3.6V; powers internal amplifiers and bias circuitry |
| OUT (Bump A2) | Current-output terminal | Sources/sinks current proportional to VSENSE; requires external ROUT to GND (unidirectional) or VBIAS (bidirectional) |
| GND (Bump A3) | Analog ground reference | Return path for internal circuitry; must be low-impedance connection to system ground plane |
| RS+ (Bump B1) | High-side sense resistor connection | Connects to power rail side of RSENSE; supports –0.1V to +5.5V common-mode voltage |
| RS– (Bump B2) | Low-side sense resistor connection | Connects to load side of RSENSE; input-bias current ≤100nA at +25°C minimizes error |
| CS (Bump B3) | Chip-select logic input | Active-high control: VIH ≥1.26V enables OUT; VIL ≤0.54V places OUT in high-Z state (<0.1nA leakage) |
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 |
| User-configurable gain via ROUT | Final voltage gain = GM × ROUT; enables full-scale optimization to ADC input range without changing RSENSE or dissipating excess power |
| Wide common-mode range independent of VCC | –0.1V to +5.5V operation allows monitoring of >VCC rails (e.g., 5V USB PD bus with 3.3V supply) and short-circuit detection |
| Chip-select multiplexing support | Enables up to 8+ units sharing one ADC channel using time-division control, reducing microcontroller pin count and BOM cost |
| Ultra-low quiescent current in shutdown | ICC,DES = 120µA typical with CS = 0V; drops to zero when VCC = 0V - extends battery life in always-monitoring applications |
Applications
| Smartphone Battery Charge/Discharge Monitoring | Notebook PC Multi-Rail Power Management |
|---|---|
Use Scenario: Real-time tracking of battery current during simultaneous charging and system load in dual-mode smartphones. IC Role / Device Role / Timing Role: High-side current-sense amplifier converting ±10mV VSENSE into 5µA/mV proportional output current, multiplexed via CS to shared ADC. Use Value: Enables accurate coulomb counting with <1% gain error and ±20µV offset, supporting precise battery fuel gauging over full temperature range. |
Use Scenario: Concurrent monitoring of CPU, GPU, and SSD supply currents in thin-and-light notebooks with limited ADC resources. IC Role / Device Role / Timing Role: One MAX9934FART+T per rail, CS-controlled time-division multiplexing onto single SAR ADC channel with 10kΩ ROUT. Use Value: Reduces component count vs. discrete voltage-output amplifiers while maintaining 220µs settling time for dynamic load step response. |
| Portable Medical Sensor Instrumentation | Ultra-Mobile PC (UMPC) System Health Monitoring |
Use Scenario: Low-power current measurement in wearable ECG/PPG modules where RSENSE self-heating must be minimized. IC Role / Device Role / Timing Role: Bidirectional current monitor with ROUT terminated to VREF/2, enabling ±1.65V output swing for analog front-end interfacing. Use Value: 5µA/mV gain allows use of 20mΩ RSENSE (vs. 100mΩ for voltage-output ICs), cutting I²R loss by 80% and eliminating thermal drift errors. |
Use Scenario: Continuous monitoring of 3.3V, 1.8V, and 1.2V domain currents in fanless UMPCs with thermal constraints. IC Role / Device Role / Timing Role: High-side amplifier operating at –40°C to +125°C, leveraging –0.1V to +5.5V CMVR to sense 5V display backlight rail with 3.3V supply. Use Value: Eliminates need for level-shifting circuitry while maintaining <0.25% gain error across temperature - critical for predictive thermal throttling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-precision current-sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A1IDR | Voltage-output architecture; 80V common-mode range; 120µV max VOS at +25°C; SOIC-8 package (3.9mm × 4.9mm) | Requires external level-shifting for >VCC sensing; higher offset limits resolution below ±50mV VSENSE | Select when wide common-mode (>65V) or industry-standard SOIC packaging is required; not suitable for UCSP-space-constrained designs |
| MAX40086ATA+T | Current-output; 20µA/mV gain option; 6-bump WLP (1.2mm × 1.6mm); ±12µV max VOS (–40°C to +125°C) | Higher gain reduces ROUT sensitivity but limits full-scale VSENSE to ±5mV; smaller VOS improves sub-mA resolution | Select when tighter offset spec is critical and ±5mV sensing range aligns with system RSENSE choice; same UCSP footprint enables drop-in layout reuse |
Compared with INA240A1IDR and MAX40086ATA+T, the MAX9934FART+T offers optimal balance of ultra-low offset (±20µV), UCSP size, and 5µA/mV gain for ±10mV full-scale battery monitoring - making it uniquely suited for space- and precision-constrained portable applications where multiplexing and rail-to-rail sensing are essential.
Availability
MAX9934FART+T is available at Aetrix Electronics and suitable for smartphone battery management, notebook PC multi-rail monitoring, and portable medical instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX9934FART+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 leader in precision analog, mixed-signal, and power-management ICs, serving industrial, automotive, communications, and consumer markets with high-reliability solutions.
The MAX9934 product line was designed specifically for high-accuracy, low-power, high-side current sensing in battery-powered portable electronics - emphasizing minimal VSENSE requirements, multiplexing capability, and ultra-small packaging for next-generation mobile devices.
FAQ
What is the function of the CS pin on the MAX9934FART+T?
The CS (chip-select) pin on the MAX9934FART+T is an active-high digital control input that enables or disables the output current source. When CS ≥1.26V, the device actively drives OUT with current proportional to VSENSE; when CS ≤0.54V, OUT enters a high-impedance state with <0.1nA leakage. This allows multiple MAX9934FART+T units to share a single ADC input via time-division multiplexing, reducing system pin count and simplifying PCB routing in multi-rail monitoring applications.
How does the MAX9934FART+T achieve sensing below ground (–0.1V common-mode)?
The MAX9934FART+T achieves –0.1V input common-mode capability through proprietary input stage design that extends the operational range of its RS+ and RS– inputs below the GND reference. This enables accurate current measurement in configurations where the sense resistor is placed between a negative supply and load (e.g., in certain audio amplifier bias circuits or dual-supply sensor interfaces). The specification is guaranteed across –40°C to +125°C and does not require special biasing - it functions natively with standard 2.5V–3.6V VCC.
Can the MAX9934FART+T be used for bidirectional current sensing, and how is it configured?
Yes, the MAX9934FART+T supports bidirectional current sensing by terminating the OUT pin to a midrail reference voltage (VBIAS) instead of GND. For a 3.3V system with 1.65V ADC reference, VBIAS = VREF/2 is generated using a resistor divider, and ROUT is set to half the divider resistance value. Positive VSENSE causes OUT to source current and raise VOUT above VBIAS; negative VSENSE causes OUT to sink current and lower VOUT below VBIAS. The MAX9934FART+T's matched transconductance architecture ensures symmetrical gain and offset performance in both directions.
What is the maximum ROUT value recommended for driving a SAR ADC with the MAX9934FART+T?
The MAX9934FART+T datasheet recommends ROUT ≤10kΩ when interfacing with SAR ADCs to avoid accuracy degradation from sampling capacitor loading. At 10kΩ, the output impedance presents minimal RC time constant with typical ADC input capacitance (≤10pF), ensuring full settling within 220µs. If higher ROUT is needed for gain scaling, a 100pF–1nF ceramic capacitor should be placed from OUT to GND near the ADC input to supply instantaneous charge during acquisition - this maintains ±1/2 LSB accuracy without increasing RSENSE power loss.
How does the MAX9934FART+T handle power supply removal (VCC = 0V) during system sleep?
When VCC = 0V, the MAX9934FART+T enters a true zero-power state: supply current drops to zero, and both RS+ and RS– inputs exhibit <0.1nA leakage current (typical), preserving battery integrity during deep-sleep modes. Crucially, the OUT pin remains high-impedance and can float up to +5.5V without damage - enabling safe multiplexing of multiple MAX9934FART+T units powered from different rails onto a common bus. This behavior is explicitly characterized in the Absolute Maximum Ratings and Electrical Characteristics tables.
MAX9934FART+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 6-WFBGA, CSPBGA
- Packaging:
- Bulk
- Product Status:
- Obsolete
- 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:
- 6-UCSP
MAX9934FART+T FAQ
1.How can I place an order for MAX9934FART+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX9934FART+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 MAX9934FART+T reliable?
The price and inventory of MAX9934FART+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX9934FART+T is usually 5 days.
3.What payment methods are accepted for MAX9934FART+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX9934FART+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX9934FART+T?
MAX9934FART+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX9934FART+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 MAX9934FART+T?
For technical support, including MAX9934FART+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX9934FART+T requirements.
6.How does Aetrix verify that MAX9934FART+T is sourced from the original manufacturer or authorized distributors?
All MAX9934FART+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 MAX9934FART+T meets industry standards.
7.What is the process for return or replacement of MAX9934FART+T?
All MAX9934FART+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX9934FART+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 MAX9934FART+T part is unused and in its original packaging.
Return procedure for MAX9934FART+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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