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Analog Devices Inc./Maxim Integrated MAX4173FESA-T
- Part No.:
- MAX4173FESA-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX4173FESA-T.pdf
- Description:
- IC CURRENT SENSE 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,915
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Product details
Overview
MAX4173FESA-T from Maxim Integrated is a precision high-side current-sense amplifier with fixed 50V/V gain, 0V to +28V input common-mode range independent of supply voltage, ±0.5% full-scale accuracy, 1.4MHz bandwidth, and 420µA supply current. It operates from a single +3V to +28V supply across –40°C to +85°C and is used in battery charger control loops and smart battery pack monitoring.
For engineers reviewing the MAX4173FESA-T datasheet, MAX4173FESA-T pinout, MAX4173FESA-T application, or MAX4173FESA-T equivalent, this page delivers verified specifications, SOT23-6 and SO-8 package mapping, real-world use cases in portable power systems, and validated alternative parts for design continuity and sourcing flexibility.
Technical Context
The MAX4173FESA-T implements a high-impedance current-mirror-based architecture that converts differential sense voltage (VRS+ – VRS–) into a proportional voltage output without external gain-setting resistors. Its input stage maintains functionality down to 0V common-mode, enabling deep-battery-discharge monitoring.
It features a 12kΩ output impedance, supports load-side sensing via RS– connection, and delivers stable performance with <10µs power-up time and <10µs saturation recovery - critical for closed-loop battery charger feedback paths operating up to 1.4MHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 50V/V - sets full-scale output to 5V for 100mV sense voltage; eliminates need for external gain resistors. |
| Common-Mode Input Range | 0V to +28V - enables current sensing on battery anode side even at near-zero cell voltage, independent of VCC. |
| Full-Scale Accuracy | ±0.5% - ensures precise current measurement over temperature and supply variations for battery fuel gauging. |
| Bandwidth | 1.4MHz - supports dynamic response inside switching charger control loops without phase lag degradation. |
| Supply Current | 420µA - minimizes quiescent power draw in always-on battery monitoring circuits. |
| Input Offset Voltage | ±3mV - limits error contribution at low sense voltages (e.g., <10mV), critical for microamp-level standby current detection. |
| Output Impedance | 12kΩ - requires high-impedance A/D input or buffer op-amp to avoid gain reduction from loading. |
Pinout & Package
MAX4173FESA-T is available in an 8-pin SO package (SOIC-8, package code S8+4) with RoHS-compliant lead-free finish. Pin functions are electrically identical to the SOT23-6 variant but mapped to an industry-standard SO footprint for higher power dissipation and board-level robustness.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (RS–) | Load-side sense resistor terminal | Connects to low-side of external RSENSE; referenced to GND path of load/battery - enables true high-side sensing without ground disruption. |
| 2, 5, 7 (N.C.) | No internal connection | Unused pins; must be left floating or tied to GND per layout best practice - no electrical function or signal routing. |
| 3 (RS+) | Power-side sense resistor terminal | Connects to high-voltage node (up to +28V); carries full load current - placed between source and RSENSE for accurate current capture. |
| 4 (GND) | Analog ground reference | System ground return for internal amplifier bias; must be routed with low-impedance path to minimize noise coupling into sensitive input nodes. |
| 6 (OUT) | Voltage output terminal | Delivers VOUT = 50 × (VRS+ – VRS–); 12kΩ output impedance necessitates high-Z A/D or buffered interface. |
| 8 (VCC) | Positive supply input | Accepts +3V to +28V; bypassed with 0.1µF capacitor to GND - powers internal amplifier and current mirror circuitry. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 50V/V gain | Eliminates external gain resistors and associated layout sensitivity, reducing BOM count and PCB area in space-constrained portable designs. |
| 0V to +28V common-mode range | Enables uninterrupted current monitoring during battery deep discharge (<1V) while maintaining accuracy - essential for smart battery termination logic. |
| 1.4MHz bandwidth | Supports real-time current feedback in high-frequency switching chargers (e.g., 500kHz–1MHz buck converters) without loop instability. |
| ±0.5% full-scale accuracy | Reduces calibration overhead in production test; meets tight tolerance requirements for battery capacity estimation and charge termination. |
| 420µA supply current | Allows continuous current monitoring in ultra-low-power sleep modes without compromising system battery life. |
Applications
| Battery Charger Control Loop | Smart Battery Pack Monitoring |
|---|---|
|
Use Scenario: Real-time current feedback inside constant-current/constant-voltage (CC/CV) lithium-ion battery charging circuits using synchronous buck regulators. IC Role / Device Role / Timing Role: High-side current-sense amplifier providing isolated, ground-independent analog feedback to charger controller PWM circuitry. Use Value: Enables accurate CC-phase current regulation and precise CV-phase transition timing - directly improving charge cycle consistency and battery longevity. |
Use Scenario: Continuous current tracking in multi-cell Li-ion battery packs with integrated fuel gauging and protection ICs. IC Role / Device Role / Timing Role: Precision analog front-end for coulomb counting and state-of-charge (SoC) calculation in battery management subsystems. Use Value: Delivers ±0.5% full-scale accuracy over –40°C to +85°C, ensuring reliable SoC reporting across wide temperature and voltage ranges. |
| Notebook System Power Management | PA Bias Current Control |
|
Use Scenario: Dynamic load current monitoring on CPU/GPU VRM output rails to trigger thermal throttling or adaptive power capping. IC Role / Device Role / Timing Role: High-bandwidth (1.4MHz) current sensor feeding analog-to-digital converter inputs in system power controller ASICs. Use Value: Supports fast transient response to processor load spikes - prevents overcurrent shutdown while maintaining safe rail margins. |
Use Scenario: Closed-loop bias current stabilization for RF power amplifiers in cellular baseband modules requiring stable DC operating points. IC Role / Device Role / Timing Role: High-side current monitor delivering feedback to bias DAC or op-amp control loop for PA quiescent current trimming. Use Value: Compensates for process and temperature drift in PA transistors - improves linearity and reduces EVM in LTE/5G transmission. |
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 |
|---|---|---|---|
| MAX4080FASA+ | Same 50V/V gain, wider 4.5V–76V supply range, 125µA lower ICC (295µA), but only 200kHz bandwidth. | Preferred for high-voltage industrial supplies (>28V); unsuitable for >500kHz charger loops due to limited bandwidth. | Select MAX4080FASA+ only when supply exceeds +28V and bandwidth demand is ≤200kHz - not a drop-in replacement for MAX4173FESA-T in charger control. |
| INA240A1DR | 50V/V gain, 80V common-mode range, ±0.2% max gain error, but 2.6mA ICC and SO-8 package only. | Better accuracy and voltage range, but 6× higher supply current limits use in always-on battery monitoring. | Choose INA240A1DR where ultimate accuracy and HV robustness outweigh quiescent power constraints - not suitable for low-ICC portable designs. |
Compared with MAX4173FESA-T, MAX4080FASA+ trades bandwidth for extended supply range and lower ICC, while INA240A1DR offers superior accuracy and common-mode rating at significantly higher supply current - making MAX4173FESA-T optimal for cost-sensitive, battery-powered systems requiring 1.4MHz response and sub-500µA quiescent draw.
Availability
MAX4173FESA-T is available at Aetrix Electronics and suitable for notebook computers, smart battery chargers, and portable power-management systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX4173FESA-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 is a U.S.-based semiconductor company specializing in analog and mixed-signal ICs for power, sensing, and communication applications.
The MAX4173 product line delivers compact, low-cost high-side current-sense amplifiers optimized for battery-powered portable electronics, including notebooks, smartphones, and smart battery packs.
FAQ
What is the gain setting of MAX4173FESA-T and how is it implemented?
The MAX4173FESA-T has a fixed gain of 50V/V, achieved through internal laser-trimmed resistor ratios and current-mirror topology - no external components required. This gain is factory-set and unchangeable, ensuring consistent performance across units and eliminating gain drift from external resistor tolerances. The 50V/V ratio means a 100mV differential input produces a 5V output, directly compatible with most 5V ADC references.
Does MAX4173FESA-T support operation with a 3.3V supply voltage?
Yes, MAX4173FESA-T operates from a single +3V to +28V supply, fully functional at 3.3V. At VCC = 3.3V, it maintains its 0V to +28V input common-mode range and delivers valid output swing from ~0.04V to (VCC – 0.8V), supporting low-voltage microcontroller interfaces. Supply current remains within 420µA typical across the entire voltage range.
Can MAX4173FESA-T accurately measure current when the battery voltage drops below 1V?
Yes, MAX4173FESA-T guarantees operation down to 0V common-mode input - meaning it remains fully functional even when the battery anode (RS+) is at 0.1V or lower. Its input stage does not require headroom above ground, enabling precise current measurement during deep discharge states where other amplifiers fail or lose accuracy.
What is the maximum recommended load capacitance on the OUT pin of MAX4173FESA-T?
The MAX4173FESA-T datasheet specifies CLOAD = 5pF for all bandwidth and settling time measurements. Driving >10pF risks peaking, overshoot, or reduced bandwidth. For capacitive loads >5pF, add a series 10Ω–50Ω isolation resistor adjacent to the OUT pin and route to a high-impedance ADC input or unity-gain buffer to preserve stability and transient response.
Is MAX4173FESA-T pin-compatible with other variants in the MAX4173 family?
Yes, MAX4173FESA-T shares identical SO-8 pinout with MAX4173TESA+ and MAX4173HESA+, differing only in internal gain (50V/V vs. 20V/V or 100V/V). All share same VCC, GND, RS+, RS–, OUT, and N.C. pin assignments - enabling direct substitution in existing layouts when gain requirements change, provided output voltage scaling and accuracy targets align.
MAX4173FESA-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Amplifier Type:
- Current Sense
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- -
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 1.4 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
MAX4173FESA-T FAQ
1.How can I place an order for MAX4173FESA-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4173FESA-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 MAX4173FESA-T reliable?
The price and inventory of MAX4173FESA-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4173FESA-T is usually 5 days.
3.What payment methods are accepted for MAX4173FESA-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4173FESA-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4173FESA-T?
MAX4173FESA-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4173FESA-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 MAX4173FESA-T?
For technical support, including MAX4173FESA-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4173FESA-T requirements.
6.How does Aetrix verify that MAX4173FESA-T is sourced from the original manufacturer or authorized distributors?
All MAX4173FESA-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 MAX4173FESA-T meets industry standards.
7.What is the process for return or replacement of MAX4173FESA-T?
All MAX4173FESA-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX4173FESA-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 MAX4173FESA-T part is unused and in its original packaging.
Return procedure for MAX4173FESA-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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