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Analog Devices Inc./Maxim Integrated MAX9938FEBS+TG45
- Part No.:
- MAX9938FEBS+TG45
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 4-WFBGA, CSPBGA
- Datasheet:
-
MAX9938FEBS+TG45.pdf
- Description:
- IC CURRENT SENSE 1 CIRCUIT 4UCSP
- Quantity:
- Payment:
- Shipping:
Inventory:2,770
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Product details
Overview
MAX9938FEBS+TG45 from Maxim Integrated is a unidirectional high-side current-sense amplifier with 50V/V fixed gain, 500μV max input offset voltage, <0.5% max gain error, and ultra-low 1μA max quiescent supply current. It operates from 1.6V to 28V common-mode input range and delivers precision voltage output for battery-current monitoring in portable electronics.
For engineers reviewing the MAX9938FEBS+TG45 datasheet, MAX9938FEBS+TG45 pinout, MAX9938FEBS+TG45 application, or MAX9938FEBS+TG45 equivalent, this page provides verified package mapping (4-bump UCSP), confirmed pin functions, real-world use cases in battery-powered systems, and validated alternative options for current-sense amplifier selection.
Technical Context
The MAX9938FEBS+TG45 uses a BiCMOS-based architecture with matched internal gain resistors (R1 = 200Ω, ROUT = 10kΩ) to achieve precise 50V/V amplification of VSENSE = VRS+ − VRS−. Its high-voltage p-channel FET input stage enables operation down to 1.6V supply while maintaining rail-to-rail output swing relative to RS−.
It features integrated 6V output clamping and 7mA current limiting for overdrive protection, and its CMRR exceeds 94dB across 1.6V–28V common-mode range. The device is stable with any external capacitive load and supports Kelvin-sense PCB layouts to minimize trace resistance errors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 50V/V - fixed ratio enabling accurate scaling of 10mV–60mV full-scale sense voltages into 0.5V–3.0V ADC-friendly output range |
| Input Offset Voltage | ±500μV max - ensures ≤1% measurement error at 50mV VSENSE, critical for low-current battery monitoring |
| Gain Error | ±0.5% max - guarantees consistent scaling across temperature (−40°C to +85°C), reducing calibration burden |
| Supply Current | 1μA max - extends battery life in always-on current-monitoring circuits without sacrificing accuracy |
| Common-Mode Range | 1.6V to 28V - supports direct sensing from Li-ion (2.5V–4.2V), lead-acid (6V–14V), and 24V industrial rails |
| Small-Signal Bandwidth | 60kHz - sufficient for DC/low-frequency load transients (e.g., CPU burst current) while rejecting switching noise |
| Output Resistance | 7.0–10kΩ - compatible with standard 10kΩ ADC input impedance without loading-induced gain shift |
Pinout & Package
MAX9938FEBS+TG45 is packaged in a 4-bump, 1mm × 1mm × 0.6mm UCSP (Ultra-Compact Silicon Package) with RoHS-compliant G45 protective die coating. This wafer-level chip-scale package enables minimal PCB footprint and thermal performance suitable for space-constrained portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 | RS+ | High-side connection to current-sense resistor; accepts common-mode voltage up to +28V |
| A2 | RS− | Low-side connection to current-sense resistor; referenced to GND and defines output baseline |
| B1 | GND | Analog ground return path; must be tied directly to system ground plane to minimize offset drift |
| B2 | OUT | Voltage output proportional to VSENSE × 50; drives ADC or comparator with 0.1V–0.2V headroom below RS− |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 1μA max enables multi-year battery life in IoT sensors and always-on power monitors |
| Precision offset voltage | 500μV max allows use of small-value sense resistors (e.g., 10mΩ) without compromising resolution |
| Wide common-mode range | 1.6V–28V supports direct integration into battery-input paths without level-shifting circuitry |
| Stable with capacitive loads | No external compensation required - simplifies layout and eliminates stability risks with ADC sampling caps |
| Output overvoltage protection | 6V clamp and 7mA current limit prevent damage during RS+/RS− miswiring or transient overloads |
Applications
| Smartphone Battery Monitoring | USB-C Power Delivery Analyzer |
|---|---|
|
Use Scenario: Real-time tracking of charge/discharge current in lithium-ion battery packs during fast charging cycles. IC Role / Device Role / Timing Role: High-side current-sense amplifier converting mV-level sense voltage into clean, amplified analog signal for microcontroller ADC. Use Value: Enables ±1% current accuracy at 10mV full-scale VSENSE, supporting USB PD 3.0 compliance and thermal-safe charging algorithms. |
Use Scenario: Measuring source/sink current on USB-C CC and VBUS lines during power role negotiation and data transfer. IC Role / Device Role / Timing Role: Precision analog front-end for bidirectional current detection in USB-C controller reference designs. Use Value: 1.6V minimum common-mode operation allows sensing at low VBUS (e.g., 3.3V accessory mode), while 50V/V gain matches typical 20mΩ shunt ranges. |
| Industrial Portable Metering | Medical Wearable Power Management |
|
Use Scenario: Monitoring battery discharge in handheld multimeters and portable oscilloscopes with dual 12V/24V battery inputs. IC Role / Device Role / Timing Role: High-voltage tolerant current sensor interfacing between battery stack and low-voltage MCU domain. Use Value: 28V common-mode rating eliminates need for external attenuators when measuring 24V nominal systems, reducing BOM count and error sources. |
Use Scenario: Ultra-low-power current monitoring in ECG patches and insulin pumps where battery runtime directly impacts patient safety. IC Role / Device Role / Timing Role: Nano-power analog sensor core delivering sub-μA standby consumption while maintaining medical-grade current accuracy. Use Value: 1μA max ICC enables >5-year shelf life in sealed wearable devices, meeting ISO 13485 power budget requirements. |
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 |
|---|---|---|---|
| INA219BIDR | I²C digital output; 0.1% gain error; 12-bit ADC integrated; 26V max common-mode | Requires no external ADC but adds firmware overhead; less suitable for analog-loop feedback | Choose INA219BIDR when digital interface and onboard conversion simplify system architecture |
| MAX40056AUT+T | 200V/V gain; 125kHz bandwidth; 2.7V–36V supply; 5-pin SOT23 package | Higher bandwidth supports switching regulator current loop control; larger footprint than UCSP | Choose MAX40056AUT+T when faster transient response is needed and board space permits SOT23 |
Compared with MAX9938FEBS+TG45, INA219BIDR trades analog simplicity for digital integration and reduced external components, while MAX40056AUT+T offers higher speed and wider supply range at the cost of larger size and higher quiescent current (12μA).
Availability
MAX9938FEBS+TG45 is available at Aetrix Electronics and suitable for smartphone battery management, USB-C power analyzers, and portable medical devices requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX9938FEBS+TG45 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 MAX9938 family was developed specifically for ultra-low-power, high-accuracy current sensing in battery-operated portable electronics, emphasizing nano-power operation, wide common-mode range, and miniature UCSP packaging.
FAQ
What is the exact package type and dimensions of MAX9938FEBS+TG45?
MAX9938FEBS+TG45 uses a 4-bump UCSP (Ultra-Compact Silicon Package) measuring 1.0mm × 1.0mm × 0.6mm with RoHS-compliant G45 protective die coating. The bump layout is A1 (RS+), A2 (RS−), B1 (GND), B2 (OUT), and it requires a specific land pattern per Maxim's outline no. 21-0117. This package enables the smallest PCB footprint among all MAX9938 variants.
Does MAX9938FEBS+TG45 support bidirectional current sensing?
MAX9938FEBS+TG45 is a unidirectional high-side current-sense amplifier optimized for monitoring current flow in one direction only - from power source to load. While bidirectional operation is possible using two MAX9938FEBS+TG45 devices (one for charge, one for discharge), the device itself does not provide dual-polarity output or internal polarity reversal logic.
What is the maximum allowable voltage difference between RS+ and RS− on MAX9938FEBS+TG45?
The absolute maximum differential voltage between RS+ and RS− on MAX9938FEBS+TG45 is ±30V, as specified in the Absolute Maximum Ratings table. However, for reliable linear operation, VSENSE = (VRS+ − VRS−) must remain within the device's specified full-scale range - typically 10mV to 60mV for the 50V/V gain version to maintain accuracy and avoid output saturation.
Can MAX9938FEBS+TG45 operate with a 1.8V supply voltage?
Yes, MAX9938FEBS+TG45 operates with input common-mode voltage as low as 1.6V, so it functions correctly with 1.8V supply rails. At 1.8V, the output swing remains usable (VOUT(max) ≈ 1.8V − VSENSE − 0.2V), supporting accurate sensing down to ~10mV VSENSE with appropriate shunt selection and ADC reference configuration.
How does the G45 suffix affect MAX9938FEBS+TG45's reliability or assembly process?
The G45 suffix on MAX9938FEBS+TG45 indicates a protective die coating applied during wafer fabrication to enhance moisture resistance and mechanical robustness of the bare die in the UCSP package. This coating improves reliability in humid environments and supports standard reflow profiles without delamination risk, but does not alter electrical specifications or require special assembly steps beyond standard UCSP handling guidelines.
MAX9938FEBS+TG45 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 4-WFBGA, CSPBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Current Sense
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- -
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 60 kHz
- Current - Input Bias:
- -
- Voltage - Input Offset:
- 100 µV
- Current - Supply:
- 1.1µA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 1.6 V
- Voltage - Supply Span (Max):
- 28 V
- Operating Temperature:
- -45°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 4-UCSP (1.05x1.05)
MAX9938FEBS+TG45 FAQ
1.How can I place an order for MAX9938FEBS+TG45 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX9938FEBS+TG45 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 MAX9938FEBS+TG45 reliable?
The price and inventory of MAX9938FEBS+TG45 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX9938FEBS+TG45 is usually 5 days.
3.What payment methods are accepted for MAX9938FEBS+TG45?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX9938FEBS+TG45 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX9938FEBS+TG45?
MAX9938FEBS+TG45 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX9938FEBS+TG45 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 MAX9938FEBS+TG45?
For technical support, including MAX9938FEBS+TG45 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX9938FEBS+TG45 requirements.
6.How does Aetrix verify that MAX9938FEBS+TG45 is sourced from the original manufacturer or authorized distributors?
All MAX9938FEBS+TG45 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 MAX9938FEBS+TG45 meets industry standards.
7.What is the process for return or replacement of MAX9938FEBS+TG45?
All MAX9938FEBS+TG45 units undergo pre-shipment inspection (PSI). If there is an issue with MAX9938FEBS+TG45, 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 MAX9938FEBS+TG45 part is unused and in its original packaging.
Return procedure for MAX9938FEBS+TG45:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX9938FEBS+TG45 Tags
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LM358DT
STMicroelectronics
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LM358DR
Texas Instruments
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LM2904DR
Texas Instruments
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LM358ADR
Texas Instruments
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LM2904DGKR
Texas Instruments
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LM324DR
Texas Instruments
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MCP6006T-E/OT
Microchip Technology
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MCP6006UT-E/OT
Microchip Technology
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LM324PWR
Texas Instruments
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LM2902PWR
Texas Instruments
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LM2902DR
Texas Instruments
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LM358P
Texas Instruments
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