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Analog Devices Inc./Maxim Integrated MAX9938TEBS+TG45
- Part No.:
- MAX9938TEBS+TG45
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 4-WFBGA, CSPBGA
- Datasheet:
-
MAX9938TEBS+TG45.pdf
- Description:
- IC CURRENT SENSE 1 CIRCUIT 4UCSP
- Quantity:
- Payment:
- Shipping:
Inventory:2,365
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Product details
Overview
MAX9938TEBS+TG45 from Maxim Integrated is a unidirectional high-side current-sense amplifier with 25V/V fixed gain, 500μV max input offset voltage, <0.5% max gain error, and ultra-low 1μA quiescent supply current. It operates over 1.6V–28V input common-mode range in a 1mm × 1mm 4-bump UCSP package, enabling precision battery-current monitoring in space-constrained portable electronics.
For engineers reviewing the MAX9938TEBS+TG45 datasheet, MAX9938TEBS+TG45 pinout, MAX9938TEBS+TG45 application, or MAX9938TEBS+TG45 equivalent, key selection criteria include input offset voltage, gain accuracy, supply current, common-mode voltage range, and UCSP package compatibility with high-density PCB layouts.
Technical Context
The MAX9938TEBS+TG45 uses a BiCMOS-based current-mirror architecture with matched internal gain resistors (R1 = 400Ω, ROUT = 10kΩ) to achieve precise 25V/V amplification of VSENSE = VRS+ − VRS−. Its output voltage is referenced to GND and limited to ≤6V, with VOH = 0.2V (typ) above VRS− at full-scale sense input.
No external power supply pin is required-the device derives operating bias from the sensed common-mode voltage (VRS+/VRS−), enabling direct integration into battery-fed high-side sensing paths without auxiliary rails. Input protection includes ±30V differential rating and 7mA output current limiting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 25V/V - fixed ratio for linear scaling of 25mV–50mV full-scale sense voltage to 0.625V–1.25V output range |
| Input Offset Voltage | ±500μV max - enables accurate measurement of sub-100mV sense voltages without calibration |
| Gain Error | ±0.5% max - ensures <1.25mV absolute error on 250mV output at 25°C |
| Supply Current | 1μA max - supports multi-year battery life in always-on current-monitoring circuits |
| Common-Mode Range | 1.6V to 28V - allows operation down to single-cell Li-ion (2.7V) or alkaline (1.6V) battery voltage |
| Small-Signal Bandwidth | 125kHz - sufficient for DC–10kHz load current tracking in power management systems |
| Operating Temperature | −40°C to +85°C - qualified for industrial and consumer portable equipment environments |
Pinout & Package
MAX9938TEBS+TG45 is housed in a 1mm × 1mm × 0.6mm, 4-bump UCSP package with bottom-side solder bumps. The protective die coating (G45 suffix) enhances reliability in humid or contaminated environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RS+ | High-side sense resistor connection | Carries full load current; must be routed with low-inductance Kelvin path to minimize noise coupling |
| RS− | Low-side sense resistor connection | Reference node for differential sense voltage; sensitive to PCB trace resistance-requires dedicated ground return |
| GND | Signal ground reference | Return path for output stage and internal bias; must connect directly to system analog ground plane |
| OUT | Voltage output | Provides rail-to-rail compatible 0–6V output proportional to VSENSE; drives ADC inputs or comparator thresholds directly |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 1μA max enables >10-year battery life in always-on IoT sensor nodes |
| High CMRR | 94dB min suppresses switching noise from buck/boost regulators during high-frequency current sensing |
| Wide common-mode range | 1.6V–28V supports direct integration into battery-input power paths without level-shifting circuitry |
| Output short-circuit protection | Continuous safe operation when OUT is shorted to GND-no latch-up or damage risk |
| RoHS-compliant & Pb-free | G45 suffix confirms lead-free construction and environmental compliance per EU Directive 2011/65/EU |
Applications
| Battery Fuel Gauging | USB Power Delivery Monitoring |
|---|---|
Use Scenario: Real-time tracking of charge/discharge current in single-cell Li-ion battery packs for smartphones and wearables. IC Role / Device Role / Timing Role: High-side current-sense amplifier converting millivolt-level sense resistor voltage into stable, low-drift analog output for microcontroller ADC sampling. Use Value: Enables <1% state-of-charge error over full battery cycle using only 25mV full-scale VSENSE, minimizing IR loss and heat generation. | Use Scenario: Accurate current measurement in USB-C PD source ports to enforce 3A/5A current limits and prevent cable overheating. IC Role / Device Role / Timing Role: Unidirectional high-side monitor placed between PD controller and VBUS switch, delivering fast-response analog feedback for dynamic current regulation. Use Value: 125kHz bandwidth and 100µs settling time support real-time current limiting at 10kHz control loop rates without phase lag. |
| Portable Medical Device Power Management | Industrial Handheld Metering |
Use Scenario: Low-power current supervision in battery-operated glucose meters and pulse oximeters requiring FDA-grade accuracy and multi-year shelf life. IC Role / Device Role / Timing Role: Precision analog front-end element measuring microampere-range standby currents and milliampere-range active loads across temperature extremes. Use Value: ±500μV offset and −40°C to +85°C specification ensure <0.5% total error across storage and clinical use conditions without factory recalibration. | Use Scenario: Current sensing in handheld multimeters and clamp meters where PCB area is constrained and battery runtime is critical. IC Role / Device Role / Timing Role: High-side signal conditioner interfacing shunt resistor to SAR ADC, rejecting common-mode ripple from internal switching supplies. Use Value: 94dB CMRR eliminates 120Hz and 100kHz switching artifacts from internal DC/DC converters, preserving measurement fidelity. |
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 | Integrated 12-bit ADC, I²C interface, 100μA supply current, 100V/V gain only | Digital-output solution requiring MCU firmware support; lacks analog voltage output flexibility | Select when digital BOM consolidation and on-chip calibration outweigh need for analog simplicity |
| MAX4005EUT+T | 200V/V gain, 1.2μA supply current, same UCSP package, but 1.2V min common-mode | Higher gain suits lower-current applications; reduced common-mode headroom limits use below 1.2V battery voltage | Select when higher sensitivity is needed and minimum supply voltage exceeds 1.2V |
Compared with MAX9938TEBS+TG45, INA219BIDR trades analog output simplicity for integrated digitization and communication, while MAX4005EUT+T offers higher gain at marginally higher supply current and reduced low-voltage operational margin-neither is pin-compatible, and both require layout revision for substitution.
Availability
MAX9938TEBS+TG45 is available at Aetrix Electronics and suitable for battery fuel gauging, USB power delivery monitoring, and portable medical device power management requiring stable component supply, long-lifecycle assurance, and RoHS-compliant packaging.
Supply support for MAX9938TEBS+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 in resource-constrained systems.
The MAX9938 product line delivers nanoPower, high-accuracy current sensing for battery-powered portable electronics-optimized for minimal voltage drop, ultra-low quiescent current, and small-footprint integration.
FAQ
What is the maximum input common-mode voltage supported by MAX9938TEBS+TG45?
The MAX9938TEBS+TG45 supports an input common-mode voltage range from +1.6V to +28V. This means the average voltage at RS+ and RS− can be as high as 28V, allowing direct placement in high-voltage battery or industrial supply monitoring paths. Operation remains specified across the full −40°C to +85°C temperature range at this upper limit, with no derating required.
Does MAX9938TEBS+TG45 require an external power supply pin?
No, MAX9938TEBS+TG45 does not have a dedicated VCC pin. It draws operating current directly from the sensed common-mode voltage applied to RS+ and RS−, eliminating the need for auxiliary power rails. This simplifies design in single-supply battery systems and reduces component count-power is derived intrinsically from the monitored path.
What is the purpose of the G45 suffix in MAX9938TEBS+TG45?
The G45 suffix in MAX9938TEBS+TG45 indicates a protective die coating applied during wafer-level packaging. This conformal layer improves moisture resistance and mechanical robustness in harsh environments, supporting long-term reliability in portable devices exposed to humidity, sweat, or thermal cycling-without affecting electrical performance or package dimensions.
Can MAX9938TEBS+TG45 be used for bidirectional current sensing?
MAX9938TEBS+TG45 is a unidirectional high-side current-sense amplifier and cannot directly measure reverse current flow. However, it can be paired with a second identical unit in a dual-amplifier configuration-using one for charge current (RS+ to battery+, RS− to load) and another for discharge current (RS+ to load, RS− to battery+)-to enable full bidirectional monitoring with discrete analog outputs.
What is the typical output settling time of MAX9938TEBS+TG45 at full-scale step input?
The MAX9938TEBS+TG45 achieves 1% final-value settling in 100µs for a full-scale step input (e.g., 50mV VSENSE step). This performance is consistent across the −40°C to +85°C operating range and supports closed-loop current regulation at control frequencies up to 10kHz, making it suitable for dynamic load monitoring in adaptive power systems.
MAX9938TEBS+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:
- 125 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:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 4-UCSP (1.05x1.05)
MAX9938TEBS+TG45 FAQ
1.How can I place an order for MAX9938TEBS+TG45 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX9938TEBS+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 MAX9938TEBS+TG45 reliable?
The price and inventory of MAX9938TEBS+TG45 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX9938TEBS+TG45 is usually 5 days.
3.What payment methods are accepted for MAX9938TEBS+TG45?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX9938TEBS+TG45 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX9938TEBS+TG45?
MAX9938TEBS+TG45 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX9938TEBS+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 MAX9938TEBS+TG45?
For technical support, including MAX9938TEBS+TG45 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX9938TEBS+TG45 requirements.
6.How does Aetrix verify that MAX9938TEBS+TG45 is sourced from the original manufacturer or authorized distributors?
All MAX9938TEBS+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 MAX9938TEBS+TG45 meets industry standards.
7.What is the process for return or replacement of MAX9938TEBS+TG45?
All MAX9938TEBS+TG45 units undergo pre-shipment inspection (PSI). If there is an issue with MAX9938TEBS+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 MAX9938TEBS+TG45 part is unused and in its original packaging.
Return procedure for MAX9938TEBS+TG45:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX9938TEBS+TG45 Tags
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LM358DT
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LM2904DR
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MCP6006UT-E/OT
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LM2902DR
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LM358P
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