My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX9938HEBS+TG45
- Part No.:
- MAX9938HEBS+TG45
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 4-WFBGA, CSPBGA
- Datasheet:
-
MAX9938HEBS+TG45.pdf
- Description:
- IC CURRENT SENSE 1 CIRCUIT 4UCSP
- Quantity:
- Payment:
- Shipping:
Inventory:2,094
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
The MAX9938HEBS+TG45 from Maxim Integrated is a unidirectional high-side current-sense amplifier with 100V/V fixed gain, 500μV max input offset voltage, <0.5% max gain error, and ultra-low 1μA max quiescent supply current. It operates over a +1.6V to +28V input common-mode range and delivers a voltage output for precision battery-current monitoring in portable electronics.
For engineers reviewing the MAX9938HEBS+TG45 datasheet, MAX9938HEBS+TG45 pinout, MAX9938HEBS+TG45 application, or MAX9938HEBS+TG45 equivalent, key selection criteria include its 4-bump UCSP (1mm × 1mm) package, nanoscale power consumption, high CMRR (>94dB), rail-to-rail-compatible output swing, and suitability for low-voltage-drop sensing down to 30mV full-scale VSENSE.
Technical Context
The MAX9938HEBS+TG45 uses a BiCMOS-based current-mirror architecture with matched internal gain resistors (R1 = 100Ω, ROUT = 10kΩ) to achieve precise 100V/V amplification of differential sense voltage (VSENSE = VRS+ − VRS−). Its input stage accepts common-mode voltages up to +28V without external level-shifting.
Output is buffered and internally clamped to 6V maximum with 7mA typical short-circuit current limiting. The device exhibits 30kHz small-signal bandwidth at 100V/V gain and settles to 1% final value within 100μs, supporting accurate DC and pulsed current measurement in battery-powered systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 100V/V - fixed ratio enabling direct conversion of 30mV VSENSE to 3.0V output at full scale |
| Input Offset Voltage | ±500μV max - ensures ≤0.5% error contribution at 100mV VSENSE, critical for low-current accuracy |
| Gain Error | ±0.5% max - guarantees absolute current measurement accuracy independent of supply voltage variation |
| Common-Mode Range | +1.6V to +28V - supports monitoring of Li-ion batteries from near-empty (1.6V) through multi-cell stacks |
| Quiescent Supply Current | 1μA max - enables multi-year operation on coin-cell or primary batteries without measurable drain |
| CMRR | 94dB min - rejects switching noise from DC-DC converters during high-side sensing in noisy power rails |
| Small-Signal Bandwidth | 30kHz - sufficient for transient load-current capture in USB-C PD, PMIC, and charger IC applications |
Pinout & Package
MAX9938HEBS+TG45 is housed in a 4-bump, 1mm × 1mm × 0.6mm UCSP package with RoHS-compliant G45 protective die coating. Bump layout follows standard UCSP top-view orientation with bumps on bottom surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 | RS+ | High-side connection to current-sense resistor; referenced to input common-mode voltage, not separate VCC |
| A2 | RS− | Low-side connection to current-sense resistor; forms differential input pair with RS+ |
| B1 | GND | Analog ground reference for output stage and internal biasing; must be low-impedance return path |
| B2 | OUT | Voltage output proportional to VSENSE × 100; drives ADC inputs directly with 10kΩ load capability |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low 1μA supply current | Enables always-on current monitoring in battery-backed real-time clocks and fuel gauges without compromising runtime |
| 100V/V fixed gain | Eliminates external gain-setting resistors and associated layout sensitivity, reducing BOM count and board area |
| 4-bump UCSP (1mm × 1mm) | Minimizes PCB footprint in space-constrained mobile devices-smaller than 0201 passives-and supports high-density routing |
| +1.6V to +28V common-mode range | Permits direct integration into battery-input paths without level-shifting circuitry, simplifying power-path design |
| 500μV max input offset | Supports accurate measurement of sub-100mA currents using 30mΩ–100mΩ sense resistors, minimizing I²R loss |
Applications
| Smartphone Battery Monitoring | USB-C Power Delivery Controller |
|---|---|
Use Scenario: Real-time tracking of charge/discharge current in Li-ion battery packs during fast charging and system sleep states. IC Role / Device Role / Timing Role: High-side current-sense amplifier converting mV-level VSENSE across 20mΩ shunt into clean 0–3V analog output for fuel-gauge MCU ADC. Use Value: Enables ±1% full-scale current accuracy at 100mA–5A range while consuming <1μA, extending standby time by >15% versus higher-IQ alternatives. | Use Scenario: Measuring source/sink current in USB-C port controllers to enforce PD contract compliance and prevent overcurrent faults. IC Role / Device Role / Timing Role: Precision high-side monitor placed between VBUS and load switch, delivering fast-response current feedback to PD policy engine. Use Value: 30kHz bandwidth and 100μs settling support dynamic current limiting during 100ms PD negotiation bursts without latency-induced trip errors. |
| Wearable Health Sensor Hub | Industrial Portable Data Logger |
Use Scenario: Monitoring current drawn by optical heart-rate sensors and Bluetooth LE radios in compact wearable form factors. IC Role / Device Role / Timing Role: Nanopower current sensor interfacing directly to 12-bit SAR ADC in ultra-low-power microcontroller, operating from single CR2032 cell. Use Value: 1μA IQ and 30mV full-scale VSENSE allow continuous current logging for >6 months on 220mAh battery, with no wake-up overhead. | Use Scenario: Logging battery discharge profiles in handheld test equipment used for field calibration of industrial sensors. IC Role / Device Role / Timing Role: High-accuracy current monitor feeding isolated sigma-delta ADC, rejecting common-mode noise from 24V DC input and motor drive transients. Use Value: 94dB CMRR and 28V common-mode tolerance eliminate need for optocoupled isolation or external filtering, cutting BOM cost by $0.35/unit. |
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, 0.1% gain error, 100μA supply current | Requires digital interface and firmware integration; lacks analog output flexibility | Select when system already uses I²C and needs built-in ADC; avoid when analog output to existing MCU ADC is preferred |
| MAX4008ETA+ | 100V/V gain, 600μV max VOS, 1.5μA max ICC, SOT23-5 package | Larger footprint (2.9mm × 1.6mm), higher quiescent current, same gain but looser offset spec | Select when UCSP assembly is unavailable; trade-off is +0.5μA IQ and +100μV VOS, acceptable in non-battery-critical designs |
Compared with MAX9938HEBS+TG45, INA219BIDR adds digital functionality at the cost of higher power and inflexibility in analog signal chain reuse, while MAX4008ETA+ offers identical gain in a legacy package but sacrifices nanopower operation and offset precision required for sub-100mA sensing.
Availability
MAX9938HEBS+TG45 is available at Aetrix Electronics and suitable for smartphone battery management, USB-C power delivery control, wearable health monitoring, and industrial portable data loggers requiring stable component supply across long production lifecycles.
Supply support for MAX9938HEBS+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, mixed-signal, and power-management ICs for demanding industrial, automotive, and portable applications.
The MAX9938 family targets ultra-low-power, high-accuracy current sensing in battery-operated devices, emphasizing nanopower operation, miniature packaging, and robust performance across wide input voltage ranges.
FAQ
What is the exact package type and dimensions of the MAX9938HEBS+TG45?
The MAX9938HEBS+TG45 uses a 4-bump UCSP (Ultra Compact Silicon Package) measuring 1.0mm × 1.0mm × 0.6mm with bumps on the bottom surface. The "G45" suffix denotes Maxim's protective die coating for enhanced moisture and mechanical robustness. This package is distinct from SOT23 or μDFN variants and requires specific reflow profile and PCB land pattern per Maxim Application Note 1891.
Does the MAX9938HEBS+TG45 require an external power supply pin?
No, the MAX9938HEBS+TG45 has no dedicated VCC pin. Its supply is derived from the input common-mode voltage applied across RS+ and RS−, which must be between +1.6V and +28V. This eliminates the need for auxiliary regulators and simplifies power-domain partitioning in high-side sensing applications where only the battery or rail voltage is available.
What is the maximum allowable voltage difference between RS+ and RS− for the MAX9938HEBS+TG45?
The MAX9938HEBS+TG45 specifies a maximum differential input voltage (RS+ to RS−) of ±30V. However, for reliable operation within datasheet limits, the absolute voltage across the sense resistor (VSENSE) should remain ≤50mV to maintain linearity and minimize self-heating effects on accuracy. The device's 100V/V gain means 50mV VSENSE produces 5.0V output, aligning with typical 3.3V or 5V ADC reference levels.
How does the MAX9938HEBS+TG45 handle overvoltage conditions on the OUT pin?
The MAX9938HEBS+TG45 includes internal output protection: a 6V clamp limits OUT voltage relative to GND, and a 7mA typical current-limit circuit prevents damage during sustained short-circuit events. These features allow direct connection to 3.3V or 5V ADC inputs without external series resistors or diodes, provided the ADC input impedance remains ≥10kΩ to avoid loading-induced gain error.
Can the MAX9938HEBS+TG45 be used for bidirectional current sensing?
The MAX9938HEBS+TG45 is a unidirectional high-side amplifier optimized for current flow from RS+ to RS− (i.e., battery-to-load direction). For true bidirectional sensing, two MAX9938HEBS+TG45 units can be configured-one monitoring charge current (RS+ at battery, RS− at charger) and one monitoring discharge (RS+ at battery, RS− at load)-with separate ADC channels, as shown in Maxim's Figure 3. It does not natively support reverse-polarity output swing.
MAX9938HEBS+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:
- 30 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)
MAX9938HEBS+TG45 FAQ
1.How can I place an order for MAX9938HEBS+TG45 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX9938HEBS+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 MAX9938HEBS+TG45 reliable?
The price and inventory of MAX9938HEBS+TG45 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX9938HEBS+TG45 is usually 5 days.
3.What payment methods are accepted for MAX9938HEBS+TG45?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX9938HEBS+TG45 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX9938HEBS+TG45?
MAX9938HEBS+TG45 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX9938HEBS+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 MAX9938HEBS+TG45?
For technical support, including MAX9938HEBS+TG45 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX9938HEBS+TG45 requirements.
6.How does Aetrix verify that MAX9938HEBS+TG45 is sourced from the original manufacturer or authorized distributors?
All MAX9938HEBS+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 MAX9938HEBS+TG45 meets industry standards.
7.What is the process for return or replacement of MAX9938HEBS+TG45?
All MAX9938HEBS+TG45 units undergo pre-shipment inspection (PSI). If there is an issue with MAX9938HEBS+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 MAX9938HEBS+TG45 part is unused and in its original packaging.
Return procedure for MAX9938HEBS+TG45:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX9938HEBS+TG45 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…
