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Analog Devices Inc./Maxim Integrated MAX4173ATEUT+T
- Part No.:
- MAX4173ATEUT+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-6
- Datasheet:
-
MAX4173ATEUT+T.pdf
- Description:
- IC CURR SENSE 1 CIRCUIT SOT23-6
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
The MAX4173ATEUT+T from Maxim Integrated is a precision high-side current-sense amplifier in SOT23-6 package, delivering 20V/V fixed gain, ±0.5% full-scale accuracy, ±3mV input offset voltage, and 1.7MHz bandwidth. It operates from +3V to +28V supply, draws only 420µA quiescent current, and supports 0V to +28V input common-mode range independent of supply-enabling accurate battery discharge monitoring in notebook computers and smart chargers.
For engineers reviewing the MAX4173ATEUT+T datasheet, MAX4173ATEUT+T pinout, MAX4173ATEUT+T application, or MAX4173ATEUT+T equivalent, key selection criteria include its high-side sensing architecture, voltage-output interface eliminating external gain resistors, guaranteed performance across –40°C to +85°C, and compatibility with low-inductance PCB trace sense elements in space-constrained portable power systems.
Technical Context
The MAX4173ATEUT+T implements a high-impedance current-mirror-based sensing architecture that forces the RS+ and RS– terminals to develop a differential voltage (VSENSE) proportional to load current through an external sense resistor. Its input stage maintains functional operation down to 0V common-mode voltage-critical for deep-battery-discharge monitoring-while rejecting supply variations via 90dB CMR and ≥60dB PSR up to 10kHz.
Unlike shunt-based low-side amplifiers, the device isolates current sensing from ground return paths, preserving battery charger integrity. Its 12kΩ output impedance requires high-Z A/D inputs or buffered interfacing; saturation recovery time is 10µs, and power-up settling to 1% occurs within 10µs-supporting real-time control-loop integration in battery charging ICs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 20V/V - sets output voltage = 20 × (RS+ − RS−), enabling direct 100mV full-scale sense voltage → 2V output mapping |
| Full-Scale Accuracy | ±0.5% - ensures ≤10mV error at 100mV VSENSE, critical for ±1% current measurement in smart battery packs |
| Input Offset Voltage | ±3mV - limits minimum detectable VSENSE to ~15mV before offset dominates, defining low-current resolution floor |
| Bandwidth | 1.7MHz - supports transient response analysis and closed-loop stability in fast-switching charger topologies |
| Supply Current | 420µA - enables always-on current monitoring in ultra-low-power portable systems without compromising battery life |
| Common-Mode Range | 0V to +28V - allows monitoring of Li-ion batteries down to 0V terminal voltage while powered from +3V rail |
| Operating Temp | –40°C to +85°C - qualified for industrial-grade embedded power management in automotive infotainment and ruggedized IoT devices |
Pinout & Package
MAX4173ATEUT+T is housed in a RoHS-compliant, lead(Pb)-free SOT23-6 package (outline 21-0058, land pattern 90-0175), measuring 2.9mm × 1.6mm × 1.1mm with gull-wing leads. The package supports reflow soldering at +260°C and is rated for 696mW continuous power dissipation at +70°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (RS–) | Power-side sense resistor return | Connects to low-side terminal of external RSENSE; referenced to load/battery negative; must be routed away from noisy ground returns |
| 2 (GND) | Analog ground reference | System ground connection for internal biasing; separate from power ground to avoid noise coupling into high-impedance sense node |
| 3 (RS+) | Power-side sense resistor input | Connects to high-side terminal of RSENSE; carries full load current; must be short, low-inductance trace to minimize ringing |
| 4 (VCC) | Positive supply input | +3V to +28V single supply; requires 0.1µF ceramic bypass capacitor placed <1mm from pin to GND |
| 5 (N.C.) | No internal connection | Unbonded die pad; must remain floating or grounded per layout guidelines-no routing or thermal tie allowed |
| 6 (OUT) | Voltage output terminal | High-impedance current-source output (12kΩ); drives A/D converter or op-amp buffer; output swing limited to (VCC − 0.8V) high / 40mV low |
Key Features
| Feature | Design Value |
|---|---|
| 0V to +28V common-mode range | Enables current monitoring during battery deep discharge without supply rail dependency-eliminates need for level-shifting circuitry |
| Voltage-output architecture | Removes requirement for external gain-setting resistors, reducing BOM count and PCB area in compact portable designs |
| ±0.5% full-scale accuracy | Supports precise state-of-charge estimation in smart battery packs where ±1% current error directly impacts fuel-gauge longevity |
| 1.7MHz bandwidth | Permits use inside feedback loops of switch-mode battery chargers operating up to 500kHz switching frequency with phase margin margin |
| 420µA supply current | Allows continuous current logging in always-on wearable health monitors without depleting coin-cell batteries over weeks of operation |
Applications
| Notebook Computers | Smart Battery Packs/Chargers |
|---|---|
Use Scenario: Real-time battery discharge current monitoring during CPU-intensive workloads to prevent thermal throttling and optimize power delivery. IC Role / Device Role / Timing Role: High-side current-sense amplifier providing isolated analog voltage output proportional to load current, synchronized with system power-state transitions. Use Value: Enables dynamic power budgeting by feeding accurate current data to EC firmware, improving runtime prediction accuracy by >15% versus low-side alternatives. | Use Scenario: Precision charge/discharge current measurement in multi-cell Li-ion battery packs with integrated protection ICs. IC Role / Device Role / Timing Role: Primary current transducer in fuel-gauge subsystem, interfacing directly to 12-bit SAR ADC with minimal signal conditioning. Use Value: Delivers ±0.5% full-scale accuracy across –20°C to +60°C ambient, reducing coulomb-counting drift to <2% per 100 cycles under variable temperature conditions. |
| Cell Phones | PA Bias Control |
Use Scenario: Monitoring RF power amplifier supply current during LTE/Wi-Fi transmission bursts to detect antenna mismatch or PA failure. IC Role / Device Role / Timing Role: Fast-response high-side sensor capturing µs-scale current transients, triggering fault interrupts via comparator threshold crossing. Use Value: 1.7MHz bandwidth and 10µs saturation recovery enable detection of 500ns PA overcurrent events-preventing catastrophic RF front-end damage. | Use Scenario: Closed-loop bias current regulation for GaAs pHEMT power amplifiers in 5G mmWave modules requiring stable DC operating point. IC Role / Device Role / Timing Role: Feedback element in analog bias control loop, converting PA collector current to voltage for op-amp error correction. Use Value: 0V to +28V common-mode range accommodates PA supply rails up to +28V while maintaining accuracy-enabling single-supply bias control without isolation transformers. |
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 |
|---|---|---|---|
| MAX4080TASA+ | Higher 100V/V gain, 8-SO package, 2.5MHz bandwidth, ±0.2% gain accuracy, but narrower 2.7V–24V supply range | Better suited for high-gain, low-VSENSE applications (e.g., <10mV full-scale); less ideal for wide-input-voltage battery monitoring | Select MAX4080TASA+ when full-scale sense voltage is ≤10mV and SO-8 layout is acceptable; otherwise retain MAX4173ATEUT+T for SOT23 space savings and 0V–28V common-mode coverage |
| INA210AIDCKR | 20V/V gain, SOT23-6, ±0.5% gain accuracy, 0V–26V common-mode, but 10µA higher supply current (430µA vs. 420µA) and 0.5MHz bandwidth | Lower bandwidth limits use in fast charger control loops; identical gain and package simplify drop-in evaluation | Choose INA210AIDCKR only if TI's production availability or qualification status outweighs 1.2MHz bandwidth deficit in your specific charger loop design |
Compared with MAX4173ATEUT+T, MAX4080TASA+ offers tighter gain accuracy and higher speed but sacrifices 0V common-mode capability and SOT23 footprint; INA210AIDCKR matches gain and package but trades 1.2MHz bandwidth for slightly higher quiescent current-making MAX4173ATEUT+T optimal for cost-sensitive, space-constrained, wide-common-mode portable power monitoring.
Availability
MAX4173ATEUT+T is available at Aetrix Electronics and suitable for notebook computers, smart battery packs/chargers, and cell phone power management systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for MAX4173ATEUT+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, designs precision analog and mixed-signal ICs for power, sensing, and connectivity applications in industrial, automotive, and consumer markets.
The MAX4173 family was engineered specifically for high-side current sensing in battery-powered systems-prioritizing wide common-mode range, low quiescent current, and SOT23 integration to replace discrete op-amp + resistor solutions in portable electronics.
FAQ
What is the gain setting of the MAX4173ATEUT+T?
The MAX4173ATEUT+T is the T-grade variant of the MAX4173 family and features a fixed 20V/V gain. This gain is laser-trimmed at wafer test and remains stable across temperature and supply voltage variations. The "T" suffix explicitly denotes the 20V/V version, distinct from the F (50V/V) and H (100V/V) variants. Gain accuracy is specified as ±0.5% over –40°C to +85°C, ensuring predictable scaling between sensed differential voltage (VSENSE) and output voltage (VOUT) in all supported operating conditions.
Does the MAX4173ATEUT+T require external gain-setting resistors?
No, the MAX4173ATEUT+T does not require external gain-setting resistors. It integrates a precision current-mirror gain stage with laser-trimmed internal resistors, delivering a fixed 20V/V transfer function from VSENSE (RS+ − RS−) to VOUT. This eliminates component count, layout sensitivity, and resistor tolerance errors associated with discrete op-amp implementations-reducing total solution size and improving accuracy repeatability in high-volume portable designs.
What is the minimum common-mode voltage supported by the MAX4173ATEUT+T?
The MAX4173ATEUT+T supports a minimum common-mode voltage of 0V, verified across the full –40°C to +85°C temperature range. This capability allows it to monitor battery current even when the battery terminal voltage drops to 0V during deep discharge-without loss of functionality or accuracy degradation. The 0V–28V common-mode range is fully independent of the +3V to +28V supply voltage, enabling operation from low-voltage rails while sensing high-voltage battery stacks.
Can the MAX4173ATEUT+T be used with a PCB trace as the sense resistor?
Yes, the MAX4173ATEUT+T can be used with a copper PCB trace as the sense resistor, particularly where cost and space constraints preclude discrete metal-film resistors. A typical implementation uses a 0.1-inch-wide, 2-ounce copper trace (~30mΩ/ft); for example, a 2-inch trace yields ~5mΩ-suitable for 10A full-scale current with 50mV VSENSE and 1V VOUT. However, designers must account for copper's +0.4%/°C temperature coefficient and ensure trace power dissipation stays within safe limits to avoid resistance drift or thermal failure.
What is the output impedance of the MAX4173ATEUT+T and how does it affect interfacing?
The MAX4173ATEUT+T has a nominal output impedance of 12kΩ, as confirmed in the Electrical Characteristics table. This high-impedance current-source output means loading OUT with resistances below ~100kΩ introduces measurable gain error-calculated as %Error = 100 × (1 − 12kΩ / (12kΩ + RLOAD)). To maintain accuracy, connect OUT directly to a high-impedance input (e.g., SAR ADC or op-amp buffer). If buffering is required, select an op-amp with rail-to-rail input/output and supply voltage ≥ VCC to preserve full output swing.
MAX4173ATEUT+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Bulk
- Product Status:
- Active
- Amplifier Type:
- Current Sense
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- -
- Gain Bandwidth Product:
- 1.7 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 100 µA
- Voltage - Input Offset:
- 300 µV
- Current - Supply:
- 420µA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 3 V
- Voltage - Supply Span (Max):
- 28 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-6
MAX4173ATEUT+T FAQ
1.How can I place an order for MAX4173ATEUT+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4173ATEUT+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 MAX4173ATEUT+T reliable?
The price and inventory of MAX4173ATEUT+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4173ATEUT+T is usually 5 days.
3.What payment methods are accepted for MAX4173ATEUT+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4173ATEUT+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4173ATEUT+T?
MAX4173ATEUT+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4173ATEUT+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 MAX4173ATEUT+T?
For technical support, including MAX4173ATEUT+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4173ATEUT+T requirements.
6.How does Aetrix verify that MAX4173ATEUT+T is sourced from the original manufacturer or authorized distributors?
All MAX4173ATEUT+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 MAX4173ATEUT+T meets industry standards.
7.What is the process for return or replacement of MAX4173ATEUT+T?
All MAX4173ATEUT+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX4173ATEUT+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 MAX4173ATEUT+T part is unused and in its original packaging.
Return procedure for MAX4173ATEUT+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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