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Analog Devices Inc./Maxim Integrated MAX4173HEUT
- Part No.:
- MAX4173HEUT
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-6
- Datasheet:
-
MAX4173HEUT.pdf
- Description:
- IC CURR SENSE 1 CIRCUIT SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,059
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Product details
Overview
MAX4173HEUT from Maxim Integrated is a precision high-side current-sense amplifier in SOT23-6 package, delivering 100V/V fixed gain, ±0.5% full-scale accuracy, 1.2MHz bandwidth, and 0V to +28V input common-mode range independent of supply voltage. It enables accurate battery current monitoring in notebook computers, smart battery chargers, and portable power-management systems without disrupting ground paths.
For engineers reviewing the MAX4173HEUT datasheet, MAX4173HEUT pinout, MAX4173HEUT application, or MAX4173HEUT equivalent, this page provides verified technical context, real-world design meaning for key specs, validated pin functions, and two confirmed alternative parts with documented functional and application-level differences.
Technical Context
The MAX4173HEUT implements a high-impedance current-mirror-based sensing architecture that converts differential sense voltage (VRS+ − VRS−) into a proportional voltage output without external gain resistors. Its input stage operates with rail-to-rail common-mode capability down to 0V, enabling deep-discharge battery monitoring.
It features a 12kΩ output impedance current-source output stage, requiring high-impedance loading or buffered interfacing to preserve gain accuracy. Power-supply rejection exceeds 60dB up to 10kHz, and saturation recovery time is 10µs - critical for fast-charging loop stability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 100V/V - sets full-scale output = 100 × sense voltage; enables 16mV sense input to yield 1.6V output for ADC interfacing |
| Full-Scale Sense Voltage | 150mV - maximum differential input before output clipping; defines minimum RSENSE for target load current |
| Common-Mode Input Range | 0V to +28V - supports direct connection to battery anode during deep discharge (e.g., Li-ion at 2.5V) without loss of functionality |
| Supply Voltage Range | +3V to +28V - allows single-supply operation across wide input rails, including 5V, 12V, and 24V systems |
| Bandwidth | 1.2MHz - supports real-time current feedback in switching charger control loops with <800ns settling time |
| Supply Current | 420µA - enables always-on current monitoring in battery-powered devices with minimal quiescent drain |
| Input Offset Voltage | ±3mV (typ) - contributes ≤3% error at 100mV full-scale sense; limits minimum resolvable current with given RSENSE |
Pinout & Package
SOT23-6 package with 1.6mm × 2.9mm footprint, RoHS-compliant, tape-and-reel delivery. Pin 1 marked by dot; top-mark code AABP.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (RS−) | Current-sense resistor low-side terminal | Connects to load side of external sense resistor; referenced to GND potential; high-impedance input node |
| 2 (GND) | Analog ground reference | Return path for internal biasing and output stage; must be connected directly to system analog ground plane |
| 3 (RS+) | Current-sense resistor high-side terminal | Connects to power source side of sense resistor; accepts 0V–28V common-mode voltage regardless of VCC |
| 4 (VCC) | Positive supply input | Bypass with 0.1µF capacitor to GND; powers internal amplifier and current mirror; range +3V to +28V |
| 5 (N.C.) | No internal connection | Not bonded; must remain unconnected; no routing or thermal relief required |
| 6 (OUT) | Voltage output terminal | Delivers gain × (VRS+ − VRS−); 12kΩ output impedance; requires high-Z load or op-amp buffer for precision ADC interfacing |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 100V/V gain | Eliminates external gain-setting resistors, reducing BOM count and PCB area in space-constrained portable designs |
| 0V to +28V common-mode range | Enables uninterrupted current monitoring during battery voltage sag below 1V, critical for fuel-gauge accuracy in Li-ion packs |
| ±0.5% full-scale accuracy | Supports precise charge/discharge current measurement over temperature (−40°C to +85°C) without calibration |
| 1.2MHz bandwidth | Permits use inside closed-loop battery charger feedback paths where fast transient response prevents overcurrent faults |
| 420µA supply current | Allows continuous current monitoring in always-on subsystems (e.g., battery protection IC supervision) without compromising runtime |
Applications
| Notebook Battery Monitoring | Smart Charger Feedback Loop |
|---|---|
Use Scenario: Real-time battery discharge/charge current tracking in ultrabooks with dual-cell Li-ion packs. IC Role / Device Role / Timing Role: High-side current-sense amplifier measuring current flow between battery anode and system power rail. Use Value: Enables accurate coulomb counting and state-of-charge estimation without ground-path interference or voltage drop errors. | Use Scenario: Closed-loop current regulation in USB-C PD fast chargers delivering up to 5A at 20V. IC Role / Device Role / Timing Role: Primary current feedback element in switching regulator control loop with <1µs response latency. Use Value: Maintains ±1% current regulation accuracy across line/load transients, preventing overcurrent shutdown during dynamic load steps. |
| Portable Medical Device Power Management | PA Bias Current Control |
Use Scenario: Current supervision in handheld ultrasound scanners powered by removable Li-ion batteries. IC Role / Device Role / Timing Role: High-side monitor on main DC-DC converter output feeding FPGA and analog front-end. Use Value: Detects abnormal current draw indicating sensor fault or thermal runaway, triggering safe shutdown within 10ms. | Use Scenario: Bias current stabilization for Class AB RF power amplifiers in 4G/LTE mobile hotspots. IC Role / Device Role / Timing Role: Precision current feedback for DAC-controlled bias voltage generator. Use Value: Compensates for temperature-induced PA current drift, maintaining EVM compliance across −20°C to +60°C ambient. |
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 |
|---|---|---|---|
| INA210AIDR | 50V/V fixed gain, 100kHz bandwidth, 2.7V–26V supply, ±0.3% gain error | Limited to lower-bandwidth power rail monitoring; unsuitable for charger control loops requiring >1MHz response | Select when ultra-low offset (±35µV) and high PSRR (>110dB) outweigh bandwidth needs in low-noise analog systems |
| MAX4080TASA+ | 20V/V gain, SO-8 package, 2.7V–76V common-mode, ±0.5% gain error, 2.5MHz bandwidth | Wider common-mode range supports 48V industrial bus monitoring; larger SO-8 footprint increases board area | Select when monitoring >28V rails (e.g., PoE++ or telecom power) and SO-8 layout compatibility exists |
Compared with MAX4173HEUT, INA210AIDR trades bandwidth for lower offset and higher PSRR - better for precision DC measurements but inadequate for fast charger loops; MAX4080TASA+ extends voltage range and bandwidth but requires SO-8 layout changes and lacks SOT23 space efficiency.
Availability
MAX4173HEUT is available at Aetrix Electronics and suitable for notebook computers, smart battery chargers, and portable medical devices requiring stable component supply with guaranteed long-term sourcing.
Supply support for MAX4173HEUT 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 interface applications in industrial, automotive, and consumer markets.
The MAX4173 product line delivers cost-optimized, space-efficient high-side current-sense amplifiers targeting battery-powered portable electronics where ground-path integrity and small footprint are critical design constraints.
FAQ
What is the gain setting of the MAX4173HEUT and how does it affect system design?
The MAX4173HEUT has a fixed gain of 100V/V, meaning its output voltage equals 100 times the differential sense voltage (VRS+ − VRS−). This eliminates the need for external gain resistors, simplifying layout and improving accuracy by removing resistor tolerance and thermal drift effects. In practice, a 10mΩ sense resistor carrying 1A yields 10mV across it and 1V at the MAX4173HEUT output - ideal for direct interfacing with 12-bit ADCs having 3.3V full-scale range. The 100V/V gain optimizes resolution for mid-range currents while maintaining headroom against output saturation.
Does the MAX4173HEUT require external components for basic operation?
Yes - the MAX4173HEUT requires only a 0.1µF bypass capacitor between VCC and GND for stable operation, as specified in the typical operating circuit. No gain-setting resistors, feedback networks, or level-shifting components are needed due to its integrated current-mirror architecture and fixed 100V/V gain. However, if driving low-impedance loads (e.g., <100kΩ), an op-amp buffer is recommended to prevent gain error from output loading, since the MAX4173HEUT has a 12kΩ output impedance.
Can the MAX4173HEUT monitor current when the battery voltage drops below 1V?
Yes - the MAX4173HEUT supports a true 0V to +28V input common-mode range independent of supply voltage, enabling reliable operation even when the sensed node (e.g., battery anode) falls to 0V. This is confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables, where VCMR is specified as 0V minimum and tested functionality down to 0V is guaranteed. Unlike many competitors, the MAX4173HEUT maintains specified accuracy and output linearity at 0V common-mode, making it suitable for deep-discharge monitoring in Li-ion and NiMH battery systems.
What is the maximum allowable sense resistor voltage drop for the MAX4173HEUT?
The MAX4173HEUT specifies a full-scale sense voltage of 150mV, meaning the differential voltage (VRS+ − VRS−) should not exceed 150mV to avoid output saturation or nonlinearity. At 100V/V gain, this corresponds to a maximum output of 15V - but practical limits are constrained by VCC, as the output cannot exceed VCC − 0.8V (per VOH specification). For example, with VCC = 5V, the usable full-scale sense voltage is limited to 42mV (since 4.2V ÷ 100 = 42mV). Therefore, system designers must select RSENSE based on both current range and supply voltage to stay within the 150mV absolute limit and maintain output headroom.
How does the MAX4173HEUT handle overvoltage or reverse-polarity conditions on its inputs?
The MAX4173HEUT includes robust input protection: RS+ and RS− pins tolerate −0.3V to +30V relative to GND, exceeding the 0V–28V operating range. Differential input voltage is limited to ±0.3V, and internal ESD structures protect against transient events. However, sustained reverse polarity (e.g., RS− > RS+) beyond ±0.3V may cause phase reversal or latch-up - the device does not include active reverse-polarity protection. For systems exposed to accidental reverse connections, external Schottky clamps or series MOSFETs are recommended. Absolute maximum ratings confirm continuous operation under short-circuit of OUT to VCC or GND, but input pins must remain within specified voltage ranges for reliable function.
MAX4173HEUT 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:
- -
- -3db Bandwidth:
- 1.2 MHz
- 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
MAX4173HEUT FAQ
1.How can I place an order for MAX4173HEUT through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4173HEUT 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 MAX4173HEUT reliable?
The price and inventory of MAX4173HEUT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4173HEUT is usually 5 days.
3.What payment methods are accepted for MAX4173HEUT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4173HEUT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4173HEUT?
MAX4173HEUT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4173HEUT 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 MAX4173HEUT?
For technical support, including MAX4173HEUT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4173HEUT requirements.
6.How does Aetrix verify that MAX4173HEUT is sourced from the original manufacturer or authorized distributors?
All MAX4173HEUT 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 MAX4173HEUT meets industry standards.
7.What is the process for return or replacement of MAX4173HEUT?
All MAX4173HEUT units undergo pre-shipment inspection (PSI). If there is an issue with MAX4173HEUT, 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 MAX4173HEUT part is unused and in its original packaging.
Return procedure for MAX4173HEUT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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