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Analog Devices Inc./Maxim Integrated MAX4073FAXK
- Part No.:
- MAX4073FAXK
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
MAX4073FAXK.pdf
- Description:
- IC CURR SENSE 1 CIRCUIT SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,952
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Product details
Overview
MAX4073FAXK from Maxim Integrated is a voltage-output, high-side current-sense amplifier with 50V/V fixed gain, +2V to +28V input common-mode range independent of supply, 1.7MHz bandwidth, ±1.0% full-scale accuracy at +25°C, and automotive-grade operation from −40°C to +125°C - used for precision battery-charger current monitoring in portable electronics.
For engineers reviewing the MAX4073FAXK datasheet, MAX4073FAXK pinout, MAX4073FAXK application, or MAX4073FAXK equivalent, this page delivers verified specifications, SC70 package details, functional role in high-side sensing circuits, and validated alternative options for current-monitoring designs requiring low quiescent current (0.5mA), wide supply range (+3V to +28V), and stable performance across temperature and common-mode voltage.
Technical Context
The MAX4073FAXK 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 stage operates with high-impedance inputs and maintains common-mode rejection (90dB) over its full +2V to +28V range.
It features an internal 12kΩ output resistance and delivers rail-to-rail compatible output swing (VCC − VOH ≤ 1.2V), enabling direct interface with ADCs or control loops in single-supply systems. Power-up time is 5µs and saturation recovery is 5µs, supporting fast transient response in charger feedback paths.
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 |
| Common-Mode Input Range | +2V to +28V - enables monitoring of battery discharge down to 2V while powered from lower VCC |
| Supply Voltage Range | +3V to +28V - supports wide-input power rails including 12V/24V industrial and automotive supplies |
| Bandwidth | 1.7MHz - sufficient for closed-loop battery-charger control with <800ns settling time to 1% |
| Full-Scale Accuracy | ±1.0% at +25°C - ensures reliable current measurement without calibration in production systems |
| Supply Current | 0.5mA typical at VCC = 28V - minimizes system power overhead in always-on monitoring applications |
| Operating Temperature | −40°C to +125°C - qualified for under-hood automotive and industrial embedded use |
Pinout & Package
MAX4073FAXK is housed in a RoHS-compliant 5-pin SC70 package (outline 21-0076), measuring 2.0mm × 1.25mm × 0.9mm - half the footprint of SOT23 - with thermal pad omitted. This ultra-compact outline supports high-density PCB layouts in space-constrained portable devices.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for internal circuitry and output stage; must be connected to system ground plane |
| 2 | VCC | Positive supply input; bypass to GND with 0.1µF ceramic capacitor near pin for stability |
| 3 | RS+ | High-side connection to external sense resistor; carries full load current and common-mode voltage up to +28V |
| 4 | RS− | Low-side connection to external sense resistor; referenced to load/battery return path |
| 5 | OUT | Voltage output proportional to (RS+ − RS−); drives high-impedance loads (≥100kΩ) to avoid gain error |
Key Features
| Feature | Design Value |
|---|---|
| No external gain resistors required | Fixed 50V/V gain simplifies BOM and layout; eliminates resistor tolerance and thermal drift errors |
| Supply-independent common-mode range | +2V to +28V operation regardless of VCC value - enables battery monitoring below supply voltage |
| Low quiescent current | 0.5mA max at full 28V supply - extends battery life in always-on current-sense applications |
| Fast transient response | 5µs power-up and saturation recovery - supports dynamic load changes in switching regulator feedback |
| Automotive-grade qualification | −40°C to +125°C operation with guaranteed specs - suitable for infotainment, ADAS, and body control modules |
Applications
| Battery Charger Feedback Loop | Smart Battery Pack Monitoring |
|---|---|
Use Scenario: Real-time current sensing inside constant-current/constant-voltage (CC/CV) lithium-ion battery chargers to regulate charge rate and terminate charging. IC Role / Device Role / Timing Role: High-side current-sense amplifier providing isolated, ground-referenced analog output proportional to charge current for microcontroller ADC sampling. Use Value: Enables precise ±1.0% full-scale current measurement across 2V–28V battery voltages without disrupting charger ground path or requiring level-shifting circuitry. |
Use Scenario: Continuous current monitoring in multi-cell smart battery packs for fuel gauging, health estimation (SOH), and overcurrent protection. IC Role / Device Role / Timing Role: High-side sensing element feeding analog current data to battery management IC or host MCU for coulomb counting and safety logic. Use Value: Delivers stable 1.7MHz bandwidth and −40°C to +125°C operation to support accurate current integration over full battery lifecycle and environmental conditions. |
| Portable System Power Management | PA Bias Current Control |
Use Scenario: Board-level current monitoring in notebook computers and PDAs to detect abnormal power draw, manage thermal throttling, and log system-level energy usage. IC Role / Device Role / Timing Role: Voltage-output current sensor interfacing directly with system PMIC or baseband processor ADC for real-time power budgeting. Use Value: SC70 footprint and 0.5mA supply current minimize board area and system power overhead while maintaining ±1.0% accuracy across operating temperature. |
Use Scenario: Closed-loop bias current regulation for RF power amplifiers in cellular handsets and wireless infrastructure equipment. IC Role / Device Role / Timing Role: High-speed current monitor feeding back to PA driver stage to maintain linear output and prevent thermal runaway. Use Value: 1.7MHz bandwidth and 800ns 1% settling time enable responsive correction of PA bias drift during modulation peaks and temperature transients. |
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 | 6-pin SOT23 package; wider 0V to +28V common-mode range; same 50V/V gain and −40°C to +125°C rating | Supports sensing at 0V common-mode (e.g., ground-referenced loads); requires larger PCB area and different layout | Select when sensing must extend down to 0V or when SOT23 footprint is already standardized in design |
| INA210AIDCKR | TI part in SC70-6; 20V/V gain (not 50V/V); 0.1% gain error; 10µV offset; 0V to +26V common-mode; 0.6mA ICC | Lacks high-gain option; superior DC accuracy but narrower common-mode range and higher supply current | Select when ultra-low offset and high DC precision outweigh need for 50V/V gain and +2V minimum common-mode |
Compared with MAX4073FAXK, MAX4173FAUT+T offers extended low-end common-mode capability at the cost of larger size, while INA210AIDCKR trades gain flexibility and common-mode headroom for tighter DC accuracy - making MAX4073FAXK optimal for compact, high-gain, battery-charger-focused designs where +2V minimum sensing is acceptable.
Availability
MAX4073FAXK is available at Aetrix Electronics and suitable for battery-powered systems, portable electronics power management, and automotive body control modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for MAX4073FAXK 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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, automotive, and communications markets.
The MAX4073 family was designed specifically for cost-sensitive, space-constrained high-side current sensing in portable and automotive power systems - delivering integrated gain, wide common-mode range, and robust temperature performance in minimal SC70 packaging.
FAQ
What is the exact gain of MAX4073FAXK and how is it implemented?
The MAX4073FAXK has a fixed gain of 50V/V, achieved via internal laser-trimmed resistor ratios and a bipolar current-mirror architecture. Unlike programmable amplifiers, this gain is factory-set and requires no external components - ensuring consistent performance across units and eliminating resistor tolerance or thermal drift effects in the signal path of MAX4073FAXK.
Does MAX4073FAXK support sensing at 0V common-mode voltage?
No, MAX4073FAXK supports a minimum common-mode input voltage of +2V, independent of supply voltage. It cannot sense at 0V. For 0V-to-+28V common-mode operation, the pin-compatible MAX4173FAUT+T (6-pin SOT23) is the recommended alternative, as explicitly stated in the MAX4073 datasheet's "For a similar device…" note.
What is the maximum allowable sense voltage (VSENSE) for MAX4073FAXK?
The MAX4073FAXK is specified for full-scale operation at VSENSE = 100mV, with absolute maximum differential input of ±5V. Operation beyond 150mV VSENSE risks violating accuracy specs and may trigger saturation; the datasheet defines 150mV as the maximum full-scale sense voltage for guaranteed linearity and error bounds in MAX4073FAXK.
Can MAX4073FAXK be used with a 3.3V supply while monitoring a 24V battery?
Yes - MAX4073FAXK's common-mode input range (+2V to +28V) is fully independent of VCC. With VCC = 3.3V, it can accurately monitor current through a sense resistor placed between a 24V battery and load, provided VCC ≥ (VOUT + 1.2V) and output loading remains high-impedance - a key design advantage of MAX4073FAXK.
Is the SC70 package of MAX4073FAXK lead-free and RoHS-compliant?
Yes, MAX4073FAXK carries the "+T" suffix per Maxim's ordering table, indicating a lead(Pb)-free and RoHS-compliant 5-pin SC70 package (X5+1 code, outline 21-0076). The "+" denotes RoHS status per Maxim's package coding convention, and the device meets JEDEC J-STD-020 moisture sensitivity level 1 requirements.
MAX4073FAXK Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 5-TSSOP, SC-70-5, SOT-353
- Packaging:
- Bulk
- Product Status:
- Active
- 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:
- SC-70-5
MAX4073FAXK FAQ
1.How can I place an order for MAX4073FAXK through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4073FAXK 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 MAX4073FAXK reliable?
The price and inventory of MAX4073FAXK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4073FAXK is usually 5 days.
3.What payment methods are accepted for MAX4073FAXK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4073FAXK transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4073FAXK?
MAX4073FAXK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4073FAXK 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 MAX4073FAXK?
For technical support, including MAX4073FAXK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4073FAXK requirements.
6.How does Aetrix verify that MAX4073FAXK is sourced from the original manufacturer or authorized distributors?
All MAX4073FAXK 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 MAX4073FAXK meets industry standards.
7.What is the process for return or replacement of MAX4073FAXK?
All MAX4073FAXK units undergo pre-shipment inspection (PSI). If there is an issue with MAX4073FAXK, 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 MAX4073FAXK part is unused and in its original packaging.
Return procedure for MAX4073FAXK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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