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Analog Devices Inc./Maxim Integrated MAX9938HEBS+T
- Part No.:
- MAX9938HEBS+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 4-WFBGA, CSPBGA
- Datasheet:
-
MAX9938HEBS+T.pdf
- Description:
- IC CURRENT SENSE 1 CIRCUIT 4UCSP
- Quantity:
- Payment:
- Shipping:
Inventory:4,043
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Product details
Overview
The MAX9938HEBS+T 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 precision voltage output for battery-current monitoring in portable electronics.
For engineers reviewing the MAX9938HEBS+T datasheet, MAX9938HEBS+T pinout, MAX9938HEBS+T application, or MAX9938HEBS+T equivalent, this device supports low-voltage-drop sensing (e.g., 30mV full-scale VSENSE), requires no external power supply (VCC-less architecture), and enables accurate current measurement in space-constrained, battery-powered systems where nano-power operation and high CMRR (>94dB) are critical.
Technical Context
The MAX9938HEBS+T uses a BiCMOS-based high-voltage p-channel FET architecture to force current through matched internal gain resistors (R1 = 100Ω, ROUT = 10kΩ), achieving precise 100V/V gain via resistor ratio matching. Its input stage accepts common-mode voltages as low as 1.6V-enabling direct battery-voltage monitoring down to near-dead-cell levels.
No separate VCC pin exists: the RS+ and RS− pins define both input common-mode voltage and effective supply rails. Output voltage swing is constrained by VRS+ (min) − VSENSE (max) − VOH (0.2V), limiting full-scale VSENSE to ~30mV at 3.6V supply for linear operation without clipping.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 100V/V - fixed ratio; outputs 100× sensed voltage drop across external shunt (e.g., 30mV → 3.0V). |
| Input Offset Voltage | ±500μV max - enables accurate low-VSENSE measurement (e.g., ±0.5% error at 100mV full-scale). |
| Gain Error | ±0.5% max - ensures calibrated current reading accuracy across -40°C to +85°C without system-level trimming. |
| Input Common-Mode Range | +1.6V to +28V - supports direct connection to Li-ion, NiMH, or multi-cell battery stacks without level-shifting. |
| Quiescent Supply Current | 1μA max - extends battery life in always-on monitoring circuits (e.g., >10-year runtime on 20mAh coin cell). |
| CMRR | 94dB min - rejects noise from switching regulators or load transients when placed high-side in noisy power rails. |
| Small-Signal Bandwidth | 30kHz - sufficient for DC/low-frequency current tracking (e.g., battery charge/discharge profiling), not RF. |
Pinout & Package
MAX9938HEBS+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 supports fine-pitch PCB assembly and thermal performance suitable for handheld devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 | RS+ | High-side connection to external sense resistor; also defines upper common-mode rail (1.6V–28V). |
| A2 | RS− | Low-side connection to external sense resistor; defines lower common-mode reference point. |
| B1 | GND | Analog ground return; must be tied to system ground plane with low-inductance path to minimize offset drift. |
| B2 | OUT | Voltage output proportional to VSENSE × 100; drives ADC inputs directly (rail-to-rail swing limited by VRS+). |
Key Features
| Feature | Design Value |
|---|---|
| Voltage-output architecture | Eliminates need for external op-amp buffer; interfaces directly with 12-bit+ SAR or delta-sigma ADCs. |
| Zero-VCC operation | Derives all bias from RS+/RS− terminals-no dedicated VDD pin simplifies layout and reduces BOM count. |
| Matched internal resistor network | R1 = 100Ω and ROUT = 10kΩ ensure stable 100V/V gain without external calibration or trimming. |
| Output short-circuit protection | 7mA typical current limit and 6V clamp prevent damage during accidental GND shorts or overvoltage events. |
| Kelvin-compatible pinout | Separate RS+ and RS− terminals enable 4-wire shunt connections to reject PCB trace resistance errors. |
Applications
| Battery Fuel Gauging | USB Power Delivery Monitoring |
|---|---|
|
Use Scenario: Real-time tracking of Li-ion battery discharge/charge current in smartphones to estimate remaining capacity and prevent over-discharge. IC Role / Device Role / Timing Role: High-side current-sense amplifier measuring voltage across 10mΩ–50mΩ shunt; provides analog output to fuel-gauge MCU ADC. Use Value: ±0.5% gain error and ±500μV offset enable <1% total current measurement error across full battery voltage range (3.0V–4.2V), improving runtime prediction accuracy. |
Use Scenario: Monitoring input current drawn from USB-C PD source in portable SSDs or docking stations to enforce power contract limits. IC Role / Device Role / Timing Role: Unidirectional high-side sensor placed between PD controller and load; outputs scaled voltage to PD policy engine ADC. Use Value: 1.6V–28V common-mode range allows operation even during USB-C VBUS brownout (down to 3.3V), ensuring continuous compliance enforcement. |
| Portable Medical Device Battery Safety | Wearable Health Monitor Power Management |
|
Use Scenario: Detecting abnormal current draw (e.g., short-circuit or leakage) in insulin pumps or portable ECG units to trigger shutdown before battery thermal runaway. IC Role / Device Role / Timing Role: Always-on current monitor in battery path; output feeds comparator or low-power microcontroller wake-up interrupt. Use Value: 1μA max quiescent current enables continuous safety monitoring without degrading 6-month standby battery life in Class II medical devices. |
Use Scenario: Measuring real-time current consumption of BLE SoC and optical sensors in fitness trackers to dynamically adjust sampling rate and extend charge cycle. IC Role / Device Role / Timing Role: Precision current-sense front-end feeding 16-bit sigma-delta ADC; supports sub-100μA resolution at 3.6V supply. Use Value: 30kHz bandwidth and <500μV offset allow detection of 50μA current steps-enabling firmware-controlled power-state optimization with <0.1% energy waste. |
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; 700μA supply current. | Requires I²C host interface; no analog output; suited for systems needing direct digital reporting rather than analog feedback loops. | Select if digital integration, auto-ranging, or bus communication outweighs analog simplicity and nano-power advantage. |
| MAX40056ASA+T | Bi-directional sensing; 500kHz bandwidth; 125μV max offset; 1.2mA supply current; 85V max common-mode. | Supports charge/discharge separation in battery management; higher speed suits motor control; larger package (8-pin SOIC). | Select only if bidirectional capability, >100kHz response, or >28V operation is required-otherwise MAX9938HEBS+T offers superior power efficiency and size. |
Compared with INA219BIDR and MAX40056ASA+T, the MAX9938HEBS+T delivers unmatched 1μA quiescent current and 1mm² footprint for always-on, space-limited battery monitoring-while trading off digital interface and bidirectional support for minimal power and maximal integration simplicity.
Availability
MAX9938HEBS+T is available at Aetrix Electronics and suitable for notebook computers, cellular handsets, and portable medical instrumentation requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for MAX9938HEBS+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) 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 nano-power operation, wide common-mode range, and minimal PCB footprint without sacrificing precision.
FAQ
What is the exact gain value and tolerance of the MAX9938HEBS+T?
The MAX9938HEBS+T has a nominal gain of 100V/V, with a maximum gain error of ±0.5% over the full -40°C to +85°C temperature range. This is confirmed in the Electrical Characteristics table under "Gain Error (Note 4)" for MAX9938H variants. The MAX9938HEBS+T achieves this via laser-trimmed internal resistor matching (R1 = 100Ω, ROUT = 10kΩ), ensuring stable performance without external calibration. Gain remains fixed and non-adjustable.
Does the MAX9938HEBS+T require an external power supply (VCC)?
No, the MAX9938HEBS+T does not require a separate VCC pin. It operates entirely from the voltage applied across its RS+ and RS− terminals, which define both the input common-mode range (+1.6V to +28V) and the effective supply rails. This zero-VCC architecture eliminates the need for auxiliary regulators or LDOs, reducing system complexity and board area-making it ideal for compact, battery-powered designs where every component counts.
What package type and dimensions does the MAX9938HEBS+T use?
The MAX9938HEBS+T uses a 4-bump UCSP (Ultra-Compact Silicon Package) measuring 1.0mm × 1.0mm × 0.6mm with bottom-side solder bumps. This RoHS-compliant, lead-free package is specified in Maxim's ordering information as "UCSP" and carries the "+" suffix indicating environmental compliance. Land pattern and reflow profile details are documented in Maxim Application Note 1891 and package outline 21-0117.
Can the MAX9938HEBS+T measure bidirectional current?
No, the MAX9938HEBS+T is a unidirectional high-side current-sense amplifier. It measures current flowing from RS+ to RS− only and outputs a positive voltage proportional to VSENSE = VRS+ − VRS−. For bidirectional applications (e.g., battery charge/discharge monitoring), two MAX9938 devices or a dedicated bidirectional amplifier like the MAX40056 would be required. The datasheet explicitly states "unidirectional" in the Detailed Description section.
What is the maximum allowable voltage between RS+ and RS− for the MAX9938HEBS+T?
The absolute maximum differential voltage between RS+ and RS− is ±30V, as stated in the Absolute Maximum Ratings table. However, for reliable linear operation, the datasheet recommends keeping VSENSE ≤ 50mV (full-scale) to maintain accuracy within the specified offset and gain error limits. At 100V/V gain, this corresponds to a maximum output swing of 5.0V-well within the OUT-to-GND rating of −0.3V to +6V.
MAX9938HEBS+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:
- 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+T FAQ
1.How can I place an order for MAX9938HEBS+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX9938HEBS+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 MAX9938HEBS+T reliable?
The price and inventory of MAX9938HEBS+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX9938HEBS+T is usually 5 days.
3.What payment methods are accepted for MAX9938HEBS+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX9938HEBS+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX9938HEBS+T?
MAX9938HEBS+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX9938HEBS+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 MAX9938HEBS+T?
For technical support, including MAX9938HEBS+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX9938HEBS+T requirements.
6.How does Aetrix verify that MAX9938HEBS+T is sourced from the original manufacturer or authorized distributors?
All MAX9938HEBS+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 MAX9938HEBS+T meets industry standards.
7.What is the process for return or replacement of MAX9938HEBS+T?
All MAX9938HEBS+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX9938HEBS+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 MAX9938HEBS+T part is unused and in its original packaging.
Return procedure for MAX9938HEBS+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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