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Analog Devices Inc./Maxim Integrated MAX4173TESA+
- Part No.:
- MAX4173TESA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX4173TESA+.pdf
- Description:
- IC CURRENT SENSE 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,051
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Product details
Overview
MAX4173TESA+ from Maxim Integrated is a precision high-side current-sense amplifier in an 8-pin SO package, delivering +20V/V fixed gain, ±0.5% full-scale accuracy, ±3mV input offset voltage, 1.7MHz bandwidth, and operation from +3V to +28V supply. It enables accurate battery current monitoring in notebook computers and smart chargers without disrupting ground paths.
For engineers reviewing the MAX4173TESA+ datasheet, MAX4173TESA+ pinout, MAX4173TESA+ application, or MAX4173TESA+ equivalent, key selection criteria include common-mode range (0V to +28V), supply current (420µA), output impedance (12kΩ), gain accuracy over temperature, and compatibility with low-inductance sense resistors in space-constrained portable systems.
Technical Context
The MAX4173TESA+ implements a high-impedance current-mirror-based architecture that isolates the sense node (RS+, RS−) from the output stage, enabling true high-side sensing independent of VCC. Its input common-mode range extends down to 0V-critical for deep-discharge battery monitoring-while maintaining functional accuracy above +2V.
It delivers voltage output proportional to sensed differential voltage (VSENSE = VRS+ − VRS−) with no external gain-setting resistors required. The internal 12kΩ output resistance and 1.7MHz small-signal bandwidth support fast transient response in battery charger control loops and PA bias regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | +20V/V - sets output voltage as 20× sensed differential voltage across RSENSE |
| Full-Scale Accuracy | ±0.5% - ensures ≤5mV error at 100mV VSENSE, critical for precise charge/discharge tracking |
| Input Offset Voltage | ±3mV (TA = +25°C) - limits minimum resolvable current when using low-value sense resistors |
| Bandwidth | 1.7MHz - supports real-time current feedback in switching regulator control loops |
| Supply Current | 420µA - enables always-on monitoring in battery-powered systems with minimal quiescent drain |
| Common-Mode Range | 0V to +28V - allows direct connection to battery terminals regardless of state-of-charge or supply rail |
| Output Impedance | 12kΩ - requires high-impedance A/D input or buffer op-amp to avoid gain error from loading |
Pinout & Package
The MAX4173TESA+ is housed in an 8-pin SO (Small Outline) package with exposed pad, RoHS-compliant, rated for -40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RS− | Load-side connection to external sense resistor; referenced to GND for differential measurement |
| 2 | N.C. | No internal connection; must be left unconnected or tied to GND per layout best practice |
| 3 | RS+ | Power-side connection to external sense resistor; carries full load current and common-mode voltage |
| 4 | N.C. | No internal connection; must be left unconnected or tied to GND |
| 5 | N.C. | No internal connection; must be left unconnected or tied to GND |
| 6 | GND | Analog ground reference for internal circuitry and output stage; requires low-impedance PCB return path |
| 7 | VCC | Positive supply input (+3V to +28V); bypass with 0.1µF capacitor close to pin for stability |
| 8 | OUT | Voltage output terminal; delivers VOUT = 20 × (VRS+ − VRS−) with 12kΩ source impedance |
Key Features
| Feature | Design Value |
|---|---|
| High-side sensing architecture | Eliminates ground-path disruption in battery systems, preserving charger integrity and system grounding |
| 0V to +28V common-mode range | Enables monitoring of deeply discharged batteries (<1V) while maintaining functional output accuracy |
| Fixed +20V/V gain | Removes need for external gain resistors, reducing BOM count and layout sensitivity to parasitic capacitance |
| 1.7MHz bandwidth | Supports closed-loop current control in high-frequency switch-mode battery chargers (e.g., 500kHz–1MHz) |
| 420µA supply current | Permits continuous current logging in ultra-low-power wake-up modes without compromising battery runtime |
Applications
| Notebook Battery Monitoring | Smart Charger Feedback Loop |
|---|---|
Use Scenario: Real-time battery discharge/charge current tracking during active CPU/GPU load transitions. IC Role / Device Role / Timing Role: High-side current-sense amplifier providing analog voltage output proportional to load current for ADC sampling. Use Value: Enables accurate Coulomb counting and state-of-charge estimation without introducing ground bounce or affecting charger IC reference integrity. | Use Scenario: Closed-loop current regulation in USB-C PD or proprietary fast-charging adapters. IC Role / Device Role / Timing Role: High-bandwidth current feedback element feeding into charger controller's error amplifier. Use Value: 1.7MHz bandwidth ensures stable loop response under dynamic load steps, preventing overshoot and thermal stress on power FETs. |
| PA Bias Control | Precision Current Source |
Use Scenario: Setting and stabilizing RF power amplifier quiescent current in cellular handsets or IoT transceivers. IC Role / Device Role / Timing Role: High-accuracy current monitor in bias control loop, rejecting supply ripple and load transients. Use Value: ±0.5% full-scale accuracy maintains consistent PA linearity and efficiency across temperature and battery voltage variation. | Use Scenario: Programmable constant-current source for LED drivers or sensor excitation circuits. IC Role / Device Role / Timing Role: Precision current-to-voltage converter with known gain, interfacing to DAC-controlled reference. Use Value: Fixed +20V/V gain and low offset enable sub-1% current setting accuracy using standard 1% sense resistors and 12-bit DACs. |
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+ | +20V/V gain, 1.5MHz bandwidth, ±0.75% gain error, 500µA ICC, SO-8 package | Higher gain error and lower bandwidth limit use in fast charger loops; wider PSR improves noise immunity | Select when higher PSR (>100dB) is prioritized over bandwidth and accuracy in noisy industrial environments |
| INA240A1D | +20V/V gain, 400kHz bandwidth, ±0.2% gain error, 2.4mA ICC, SO-8 package | Higher supply current and lower bandwidth restrict battery-life-critical or high-speed applications | Select when ultimate DC accuracy and robustness to overvoltage transients (±80V) outweigh speed and quiescent power needs |
Compared with MAX4173TESA+, MAX4080TASA+ trades bandwidth and accuracy for superior power-supply rejection, while INA240A1D offers tighter DC gain tolerance at the cost of 6× higher supply current and reduced loop speed-making MAX4173TESA+ optimal for portable, high-dynamic-range current monitoring where power and speed are co-constrained.
Availability
MAX4173TESA+ is available at Aetrix Electronics and suitable for notebook computers, smart battery chargers, PA bias control circuits, and precision current-source designs requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for MAX4173TESA+ 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 is a U.S.-based semiconductor company specializing in analog and mixed-signal ICs for power, sensing, and interface applications.
The MAX4173 product line delivers compact, low-cost, high-accuracy high-side current-sense amplifiers optimized for battery-powered portable electronics and power-management subsystems.
FAQ
What is the operating supply voltage range for the MAX4173TESA+?
The MAX4173TESA+ operates from a single supply voltage ranging from +3V to +28V. This wide range supports direct integration into systems powered by Li-ion batteries (2.7V–4.2V per cell), 12V automotive rails, or 24V industrial buses. Operation at the minimum +3V supply is fully specified across temperature, and the device maintains its 0V to +28V input common-mode range independently of VCC level.
Does the MAX4173TESA+ require external gain-setting resistors?
No, the MAX4173TESA+ does not require external gain-setting resistors. It integrates a fixed +20V/V gain amplifier, eliminating external components and associated layout sensitivities. This simplifies design, reduces board area, and avoids errors from resistor tolerance, temperature drift, and parasitic capacitance-key advantages over discrete op-amp–based current-sense solutions.
What is the input common-mode voltage range of the MAX4173TESA+ and why does it matter?
The MAX4173TESA+ features a 0V to +28V input common-mode voltage range, independent of supply voltage. This allows it to accurately monitor current even when the battery voltage drops below 1V (deep discharge), and to operate with sense nodes at voltages exceeding VCC-enabling true high-side placement without ground-path interference or level-shifting circuitry.
Can the MAX4173TESA+ be used with a PCB copper trace as the sense resistor?
Yes, the MAX4173TESA+ can interface with a PCB copper trace as RSENSE, particularly where cost or space constraints preclude discrete resistors. For example, a 2-inch, 0.1-inch-wide, 2-ounce copper trace yields ~5mΩ. However, designers must account for copper's +0.4%/°C temperature coefficient and ensure trace power dissipation remains within safe limits to avoid resistance drift or failure.
What is the output impedance of the MAX4173TESA+ and how does it affect system design?
The MAX4173TESA+ has a nominal output impedance of 12kΩ. This means any external load (e.g., ADC input, filter network, or op-amp input) connected directly to the OUT pin will attenuate the signal and reduce effective gain. To maintain accuracy, connect OUT only to high-impedance inputs (>1MΩ) or use a unity-gain buffer op-amp with rail-to-rail input/output capability when driving lower-impedance loads.
MAX4173TESA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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:
- 700 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:
- 8-SOIC
MAX4173TESA+ FAQ
1.How can I place an order for MAX4173TESA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4173TESA+ 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 MAX4173TESA+ reliable?
The price and inventory of MAX4173TESA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4173TESA+ is usually 5 days.
3.What payment methods are accepted for MAX4173TESA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4173TESA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4173TESA+?
MAX4173TESA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4173TESA+ 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 MAX4173TESA+?
For technical support, including MAX4173TESA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4173TESA+ requirements.
6.How does Aetrix verify that MAX4173TESA+ is sourced from the original manufacturer or authorized distributors?
All MAX4173TESA+ 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 MAX4173TESA+ meets industry standards.
7.What is the process for return or replacement of MAX4173TESA+?
All MAX4173TESA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX4173TESA+, 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 MAX4173TESA+ part is unused and in its original packaging.
Return procedure for MAX4173TESA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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