My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX9938FEBS+T
- Part No.:
- MAX9938FEBS+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 4-WFBGA, CSPBGA
- Datasheet:
-
MAX9938FEBS+T.pdf
- Description:
- IC CURRENT SENSE 1 CIRCUIT 4UCSP
- Quantity:
- Payment:
- Shipping:
Inventory:2,598
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX9938FEBS+T 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 quiescent supply current. It operates over 1.6V to 28V input common-mode range and delivers voltage output for precision battery-current monitoring in portable electronics.
For engineers reviewing the MAX9938FEBS+T datasheet, MAX9938FEBS+T pinout, MAX9938FEBS+T application, or MAX9938FEBS+T equivalent, this page provides verified specifications, UCSP package details, real-world use scenarios, and validated alternative options for low-power, high-accuracy current sensing in space-constrained designs.
Technical Context
The MAX9938FEBS+T 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 common-mode voltage while maintaining rail-to-rail output swing capability relative to RS−.
It features integrated 6V output clamping and 7mA current limiting for robustness against overdrive, and its stability is guaranteed across all external capacitive loads. The device requires no external power supply - VRS+ serves as both input common-mode reference and effective supply node.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 50V/V - fixed ratio enabling accurate scaling of 10mV–60mV full-scale sense voltage to 0.5V–3.0V ADC-compatible output. |
| Input Offset Voltage | ±500μV max - ensures ≤1% measurement error at 50mV VSENSE, critical for low-current detection in battery systems. |
| Gain Error | ±0.5% max - guarantees consistent scaling across temperature (−40°C to +85°C), reducing calibration burden in production. |
| Supply Current | 1.1μA max at −40°C to +85°C - enables multi-year battery life in always-on current-monitoring circuits. |
| Common-Mode Range | 1.6V to 28V - supports direct sensing from Li-ion batteries (≥1.6V) up to industrial 24V rails without level-shifting. |
| Small-Signal Bandwidth | 60kHz - sufficient for DC and slow transient current monitoring (e.g., battery charge/discharge profiling), not high-speed switching ripple rejection. |
| Output Resistance | 7.0–13.2kΩ - defines load drive capability; requires ≥100kΩ ADC input impedance to avoid gain error. |
Pinout & Package
MAX9938FEBS+T is packaged in a 4-bump, 1mm × 1mm × 0.6mm UCSP (Ultra-Compact Silicon Package) with bottom-side solder bumps. This RoHS-compliant, lead-free package is optimized for automated reflow assembly and minimal PCB footprint in ultra-thin portable devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 | RS+ | High-side connection to current-sense resistor; accepts common-mode voltage from 1.6V to 28V; also serves as effective supply reference. |
| A2 | RS− | Low-side connection to current-sense resistor; output voltage referenced to this node; must remain within −0.3V to +30V vs. GND. |
| B1 | GND | Analog ground return path; internally tied to substrate; requires low-impedance PCB connection to minimize noise coupling. |
| B2 | OUT | Voltage output proportional to VSENSE × 50; swing limited to VRS+ − VSENSE − 0.2V; drives ADC or comparator inputs directly. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 1.1μA max over full temperature range - enables continuous current monitoring in coin-cell–powered IoT sensors. |
| Precision offset voltage | ±500μV max - allows use of smaller sense resistors (e.g., 10mΩ at 5A) without sacrificing accuracy at low load currents. |
| Wide common-mode input | 1.6V to 28V - eliminates need for external level shifters when measuring current from aging Li-ion cells or 24V industrial supplies. |
| No external VCC required | VRS+ powers internal circuitry - simplifies BOM and layout by removing dedicated bias rail for the amplifier. |
| Output short-circuit protection | Continuous safe operation into GND - prevents latch-up or damage during accidental probe contact or PCB test shorts. |
Applications
| Smartphone Battery Monitoring | USB-C Power Delivery Gauging |
|---|---|
|
Use Scenario: Real-time tracking of charge/discharge current in slim-profile smartphones with dual-cell Li-ion packs. IC Role / Device Role / Timing Role: High-side current-sense amplifier converting milliohm-resistor voltage drop into clean, scaled analog output for fuel-gauge MCU. Use Value: Enables ±1% current accuracy down to 1.6V cell voltage, extending runtime estimation fidelity across full battery discharge curve. |
Use Scenario: Accurate source/sink current measurement in USB-C PD controllers managing up to 100W bidirectional power flow. IC Role / Device Role / Timing Role: Unidirectional high-side sensor feeding ADC input of PD controller to enforce current limits and detect cable faults. Use Value: 50V/V gain and 60kHz bandwidth support fast response to overcurrent events while maintaining low power consumption in standby mode. |
| Portable Medical Device Power Management | Industrial Handheld Scanner Battery Health |
|
Use Scenario: Continuous current logging in FDA-cleared wearable ECG monitors powered by rechargeable Li-Po batteries. IC Role / Device Role / Timing Role: Precision current amplifier interfacing with low-noise SAR ADC to quantify microamp-level sensor bias currents and system sleep leakage. Use Value: 1μA quiescent current ensures >5-year shelf life; ±500μV offset enables reliable detection of sub-100μA fault conditions. |
Use Scenario: Battery current profiling in ruggedized barcode scanners used in warehouse logistics with frequent hot-swap battery changes. IC Role / Device Role / Timing Role: High-side monitor reporting real-time load current to embedded ARM Cortex-M4 for predictive battery replacement alerts. Use Value: 1.6V–28V common-mode range accommodates both depleted and freshly charged 3.7V Li-ion packs without recalibration. |
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, 12-bit ADC integrated, 0.1% gain error, 26V max common-mode, 1mA supply current. | Requires I²C interface and firmware integration; better for systems needing digital telemetry but unsuitable for analog-only signal chains. | Select when digital bus communication and on-chip calibration are preferred over analog simplicity and nano-power operation. |
| MAX40056AUB+T | 500kHz bandwidth, 100V/V gain, 150μV max offset, 2.5μA supply current, 4.5V–76V common-mode range. | Supports higher voltage rails and faster transients; consumes 2.5× more quiescent current; larger 6-pin μDFN package. | Select when monitoring 48V PoE or automotive 42V systems where speed and extended voltage range outweigh ultra-low IQ requirements. |
Compared with MAX9938FEBS+T, INA219BIDR adds digital functionality at the cost of higher power and interface complexity, while MAX40056AUB+T trades nano-power efficiency for wider voltage range and bandwidth - making MAX9938FEBS+T optimal for space- and energy-constrained portable battery monitoring.
Availability
MAX9938FEBS+T is available at Aetrix Electronics and suitable for smartphone battery management, USB-C power delivery gauging, and portable medical device power monitoring requiring stable component supply across long product lifecycles.
Supply support for MAX9938FEBS+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 (now part of Analog Devices) is a semiconductor company specializing in precision analog, mixed-signal, and power-management ICs for demanding industrial, medical, and portable applications.
The MAX9938 family was designed specifically for ultra-low-power, high-accuracy current sensing in battery-operated devices - prioritizing nano-power operation, small footprint, and wide common-mode range over speed or digital integration.
FAQ
What is the exact package type and dimensions of MAX9938FEBS+T?
MAX9938FEBS+T uses a 4-bump UCSP (Ultra-Compact Silicon Package) with 1mm × 1mm × 0.6mm footprint and bottom-side solder bumps. It is RoHS-compliant and marked with top code "+AGE". This package is distinct from SOT23 and μDFN variants and requires specific reflow profile and PCB land pattern per Maxim Application Note 1891.
Does MAX9938FEBS+T require an external power supply pin?
No, MAX9938FEBS+T does not have a VCC pin. It derives operating power from the RS+ input node, which serves as both common-mode input and effective supply reference. This eliminates the need for a separate bias rail and simplifies system-level power architecture.
What is the maximum allowable voltage difference between RS+ and RS− for MAX9938FEBS+T?
The absolute maximum differential voltage (RS+ to RS−) for MAX9938FEBS+T is ±30V. However, for normal operation, VSENSE = (VRS+ − VRS−) should be kept within 2.5mV to 60mV full-scale range to maintain linearity and accuracy - corresponding to 50mV at 50V/V gain for typical 1% error budget.
Can MAX9938FEBS+T be used in bidirectional current sensing applications?
MAX9938FEBS+T is unidirectional and cannot directly measure reverse current flow. For bidirectional sensing, two MAX9938FEBS+T units may be used - one high-side and one low-side - with outputs referenced to separate ground domains, as shown in Maxim's Figure 3. No single MAX9938FEBS+T device supports true bidirectional operation.
What is the output voltage swing limitation of MAX9938FEBS+T relative to RS+?
MAX9938FEBS+T output voltage swing is limited by VOUT(max) = VRS+(min) − VSENSE(max) − VOH, where VOH is 0.2V max. With VRS+ as low as 1.6V and VSENSE(max) = 60mV (for 50V/V gain), the maximum usable output is ~1.48V. Designers must ensure ADC reference and input range accommodate this constraint.
MAX9938FEBS+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 4-WFBGA, CSPBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 4-UCSP (1.05x1.05)
MAX9938FEBS+T FAQ
1.How can I place an order for MAX9938FEBS+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX9938FEBS+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 MAX9938FEBS+T reliable?
The price and inventory of MAX9938FEBS+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX9938FEBS+T is usually 5 days.
3.What payment methods are accepted for MAX9938FEBS+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX9938FEBS+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX9938FEBS+T?
MAX9938FEBS+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX9938FEBS+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 MAX9938FEBS+T?
For technical support, including MAX9938FEBS+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX9938FEBS+T requirements.
6.How does Aetrix verify that MAX9938FEBS+T is sourced from the original manufacturer or authorized distributors?
All MAX9938FEBS+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 MAX9938FEBS+T meets industry standards.
7.What is the process for return or replacement of MAX9938FEBS+T?
All MAX9938FEBS+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX9938FEBS+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 MAX9938FEBS+T part is unused and in its original packaging.
Return procedure for MAX9938FEBS+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX9938FEBS+T Tags
-
LM358DT
STMicroelectronics
-
LM358DR
Texas Instruments
-
LM2904DR
Texas Instruments
-
LM358ADR
Texas Instruments
-
LM2904DGKR
Texas Instruments
-
LM324DR
Texas Instruments
-
MCP6006T-E/OT
Microchip Technology
-
MCP6006UT-E/OT
Microchip Technology
-
LM324PWR
Texas Instruments
-
LM2902PWR
Texas Instruments
-
LM2902DR
Texas Instruments
-
LM358P
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
