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Analog Devices Inc./Maxim Integrated MAX4073FAUT-T
- Part No.:
- MAX4073FAUT-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-6
- Datasheet:
-
MAX4073FAUT-T.pdf
- Description:
- IC CURRENT SENSE 1 CIRCUIT SOT6
- Quantity:
- Payment:
- Shipping:
Inventory:1,163
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Product details
Overview
MAX4073FAUT-T from Maxim Integrated is a high-side current-sense amplifier with voltage output, designed for precision battery-charger current monitoring in portable systems. It delivers +50V/V gain, ±1.0% full-scale accuracy at +25°C, 1.7MHz bandwidth, and operates from +3V to +28V supply across -40°C to +125°C - enabling stable integration into smart battery chargers and power management subsystems.
For engineers reviewing the MAX4073FAUT-T datasheet, MAX4073FAUT-T pinout, MAX4073FAUT-T application, or MAX4073FAUT-T equivalent, this page provides verified technical context, validated pin functions, real-world use cases in battery-powered systems, and confirmed alternative options for high-side sensing where common-mode range up to +28V and low quiescent current (0.5mA) are critical selection criteria.
Technical Context
The MAX4073FAUT-T implements a bipolar-based current-mirror architecture that converts differential sense voltage (VRS+ − VRS−) into a proportional voltage output without external gain-setting resistors. Its input common-mode range (+2V to +28V) remains fully independent of VCC, allowing direct monitoring of battery discharge paths down to +2V while operating from a lower supply.
It features internal fixed gain (50V/V), 12kΩ output impedance, and rail-to-rail compatible output stage optimized for single-supply operation. The device avoids ground-path interference in charging circuits and supports fast transient response (800ns settling to 1%) for closed-loop charger control applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | +50V/V - sets full-scale output to 5V when VSENSE = 100mV; eliminates need for external gain resistors. |
| Full-Scale Accuracy | ±1.0% at +25°C - ensures ≤50mV error on 5V output for precise current threshold detection. |
| Bandwidth | 1.7MHz - supports dynamic current monitoring inside battery-charger feedback loops. |
| Supply Current | 0.5mA typical - enables low-power operation in always-on battery monitoring circuits. |
| Common-Mode Range | +2V to +28V - allows sensing across entire Li-ion battery discharge range without supply dependency. |
| Operating Temp | -40°C to +125°C - qualified for automotive and industrial embedded power rails. |
| Output Impedance | 12kΩ - requires high-Z load or buffer to avoid gain reduction; limits drive capability to light loads only. |
Pinout & Package
MAX4073FAUT-T is housed in a RoHS-compliant 6-pin SOT23 package (package code U6+4), measuring 2.9mm × 1.6mm × 1.1mm, with gull-wing leads and thermal pad not present. This compact outline supports high-density PCB layouts in space-constrained portable electronics.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Ground reference | Primary return path for internal circuitry; must connect to system power ground with low-impedance trace. |
| 2 (RS−) | Sense resistor load-side terminal | Connects to low-side of external RSENSE; forms differential input with RS+; high-impedance node. |
| 3 (RS+) | Sense resistor power-side terminal | Connects to high-side of RSENSE (e.g., battery anode); defines common-mode input voltage. |
| 4 (VCC) | Positive supply input | Accepts +3V to +28V; requires local 0.1µF ceramic bypass capacitor to GND for stability. |
| 5 (OUT) | Voltage output | Delivers VOUT = 50 × (VRS+ − VRS−); 12kΩ source impedance mandates high-Z ADC or op-amp interface. |
| 6 (NC) | No connect | Internally unconnected; must remain floating - no routing or soldering permitted. |
Key Features
| Feature | Design Value |
|---|---|
| Voltage-output architecture | Eliminates external gain resistors and associated layout sensitivity - reduces BOM count and board area by ≥2 components. |
| +2V to +28V common-mode range | Enables direct high-side sensing of batteries discharging from 4.2V down to 2.0V without level-shifting or supply scaling. |
| 1.7MHz bandwidth | Supports real-time current feedback in switching charger ICs with >100kHz loop frequencies - avoids phase lag in regulation. |
| ±1.0% full-scale accuracy (TA = +25°C) | Ensures ≤50mV absolute error on 5V output - sufficient for ±2% current measurement in smart battery fuel gauging. |
| 0.5mA supply current | Reduces standby power draw in always-on monitoring paths - extends runtime in battery-backed systems by measurable margin. |
Applications
| Smart Battery Chargers | Portable System Power Management |
|---|---|
Use Scenario: Real-time current monitoring during CC/CV lithium-ion charging cycles in smartphones and tablets. IC Role / Device Role / Timing Role: High-side current-sense amplifier providing analog feedback to charger controller IC. Use Value: Enables accurate charge termination and safety cutoff without disrupting battery ground path - preserving system-level ground integrity. |
Use Scenario: Board-level current supervision in notebook computers to detect overcurrent faults before system reset. IC Role / Device Role / Timing Role: Analog current monitor feeding ADC input for firmware-based power budgeting and thermal throttling. Use Value: Delivers 1.7MHz response to sudden load transients - faster than typical microcontroller sampling rates, supporting predictive fault mitigation. |
| PA Bias Control | Precision Current Sources |
Use Scenario: Monitoring bias current in RF power amplifiers for adaptive linearity correction in cellular baseband modules. IC Role / Device Role / Timing Role: High-bandwidth current sensor in closed-loop PA bias control loop. Use Value: 800ns settling time ensures minimal delay between current change and correction signal - maintaining EVM compliance under modulation. |
Use Scenario: Building programmable current sources for sensor excitation (e.g., RTD, strain gauge) in industrial data acquisition units. IC Role / Device Role / Timing Role: Fixed-gain transimpedance front-end converting sense resistor voltage to calibrated output. Use Value: ±1.0% gain accuracy at +25°C and <±7.0% over full temperature range enable <0.5% total current source error without calibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-side current-sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX4173FAUT+T | Wider common-mode range (0V to +28V); same gain (50V/V), package (6-pin SOT23), and accuracy (±1.0%). | Supports sensing at 0V common-mode - required for ground-referenced current paths or dual-supply systems. | Select MAX4173FAUT+T only if sensing must extend down to 0V; otherwise MAX4073FAUT-T offers identical performance at lower cost. |
| INA213AIDCKR | Lower bandwidth (400kHz), higher supply current (1.2mA), same gain (50V/V), but includes integrated 2kΩ gain-set resistor and 1% tolerance. | Lacks independent common-mode range specification beyond 26V; not rated for full automotive temperature range (-40°C to +125°C). | Choose INA213AIDCKR only for cost-sensitive non-automotive designs where bandwidth and temperature range are secondary. |
Compared with MAX4173FAUT+T, MAX4073FAUT-T trades 0V common-mode support for lower unit cost and identical performance above +2V - making it optimal for battery-charger applications. Against INA213AIDCKR, MAX4073FAUT-T delivers 4.25× higher bandwidth and 2.4× lower supply current, with guaranteed automotive qualification.
Availability
MAX4073FAUT-T is available at Aetrix Electronics and suitable for smart battery chargers, portable system power management, PA bias control, and precision current sources requiring stable component supply across automotive and industrial temperature ranges.
Supply support for MAX4073FAUT-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 power management ICs for demanding industrial, automotive, and communications applications.
The MAX4073 family was engineered specifically for high-side current sensing in battery-powered systems - prioritizing wide common-mode range, low quiescent current, and resistorless gain configuration to simplify charger and power-rail monitoring designs.
FAQ
What is the maximum common-mode voltage supported by the MAX4073FAUT-T?
The MAX4073FAUT-T supports a +2V to +28V input common-mode voltage range, independent of its supply voltage. This means it can accurately sense current through a sense resistor placed between a +28V rail and a +2V battery terminal - critical for monitoring battery discharge in multi-cell Li-ion packs without ground disruption. The device is not rated for common-mode voltages below +2V.
Does the MAX4073FAUT-T require external gain-setting resistors?
No, the MAX4073FAUT-T does not require external gain-setting resistors. It integrates a fixed +50V/V gain stage using an internal current-mirror architecture. This eliminates layout sensitivity, resistor matching errors, and board space typically needed for discrete gain networks - simplifying design and improving long-term stability compared to op-amp-based alternatives.
What is the output impedance of the MAX4073FAUT-T, and how does it affect interfacing?
The MAX4073FAUT-T has a nominal output impedance of 12kΩ. This high source impedance means loading the OUT pin with ≤100kΩ resistance introduces measurable gain error - for example, a 100kΩ load causes ~11% gain reduction. To preserve accuracy, interface MAX4073FAUT-T directly to high-Z inputs (e.g., SAR ADCs with ≥1MΩ input impedance) or use a unity-gain buffer op-amp with rail-to-rail input/output swing.
Can the MAX4073FAUT-T be used in automotive applications?
Yes, the MAX4073FAUT-T is specified for the full automotive temperature range of -40°C to +125°C and is packaged in a RoHS-compliant 6-pin SOT23. Its ±1.0% full-scale accuracy at +25°C degrades to ±7.0% over the full temperature range - meeting requirements for battery monitoring, DC-DC converter current limiting, and motor driver feedback in automotive body electronics and infotainment power supplies.
How does the MAX4073FAUT-T differ from the MAX4073FAXK+T variant?
The MAX4073FAUT-T uses a 6-pin SOT23 package, while MAX4073FAXK+T uses a 5-pin SC70 package. Both share identical electrical specifications: +50V/V gain, ±1.0% accuracy, 1.7MHz bandwidth, and -40°C to +125°C operation. The SOT23 version includes a dedicated GND pin (Pin 1) and NC pin (Pin 6), whereas the SC70 merges GND and RS− into one pin - affecting PCB layout and thermal performance but not functional behavior.
MAX4073FAUT-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Amplifier Type:
- Current Sense
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- -
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 1.7 MHz
- Current - Input Bias:
- 40 µA
- Voltage - Input Offset:
- 1 mV
- Current - Supply:
- 500µA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 3 V
- Voltage - Supply Span (Max):
- 28 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-6
MAX4073FAUT-T FAQ
1.How can I place an order for MAX4073FAUT-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4073FAUT-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 MAX4073FAUT-T reliable?
The price and inventory of MAX4073FAUT-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4073FAUT-T is usually 5 days.
3.What payment methods are accepted for MAX4073FAUT-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4073FAUT-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4073FAUT-T?
MAX4073FAUT-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4073FAUT-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 MAX4073FAUT-T?
For technical support, including MAX4073FAUT-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4073FAUT-T requirements.
6.How does Aetrix verify that MAX4073FAUT-T is sourced from the original manufacturer or authorized distributors?
All MAX4073FAUT-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 MAX4073FAUT-T meets industry standards.
7.What is the process for return or replacement of MAX4073FAUT-T?
All MAX4073FAUT-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX4073FAUT-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 MAX4073FAUT-T part is unused and in its original packaging.
Return procedure for MAX4073FAUT-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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