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Analog Devices Inc./Maxim Integrated MAX9923HEUB+T
- Part No.:
- MAX9923HEUB+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX9923HEUB+T.pdf
- Description:
- IC CURR SENSE 1 CIRCUIT 10UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:1,975
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Product details
Overview
MAX9923HEUB+T from Maxim Integrated is an ultra-precision, high-side current-sense amplifier with fixed 100V/V gain, ±20µV max input offset voltage over temperature, ±0.5% max full-scale gain accuracy, and 1.9V to 28V input common-mode voltage range independent of VDD. It enables accurate bidirectional or unidirectional battery current monitoring in space-constrained portable power systems.
For engineers reviewing the MAX9923HEUB+T datasheet, MAX9923HEUB+T pinout, MAX9923HEUB+T application, or MAX9923HEUB+T equivalent, key selection criteria include guaranteed offset drift (±0.10 µV/°C), shutdown current (<1µA), rail-to-rail output swing, and compatibility with low-voltage sense resistors in Li+-battery-powered devices.
Technical Context
The MAX9923HEUB+T employs spread-spectrum autozeroing to suppress 1/f noise and eliminate offset drift over time and temperature, achieving <25µV max VOS. Its indirect current-feedback architecture converts differential input voltage to precision current, then compares it against a feedback-derived current to minimize errors.
This architecture supports both unidirectional (REF = GND) and bidirectional (REF = VDD/2) operation, with output referenced to REF. The device operates from +2.85V to +5.5V supply while accepting input common-mode voltages up to +28V - enabling high-side sensing in systems where VCM exceeds VDD.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | Fixed 100V/V - eliminates external resistor selection and matching errors for consistent current measurement scaling. |
| Input Offset Voltage (VOS) | ±20µV (max, -40°C to +85°C) - enables accurate sensing down to ~200µV across RSENSE, supporting sub-mA resolution. |
| Gain Accuracy | ±0.5% (max) - ensures full-scale current error remains within ±0.5%, critical for battery fuel gauging and protection. |
| Common-Mode Range | +1.9V to +28V, independent of VDD - allows direct monitoring of Li+ batteries (2.5–4.4V) and 24V industrial rails without level-shifting. |
| Supply Current | 700µA (typ), <1µA in shutdown - extends runtime in always-on battery monitoring paths and enables rapid power cycling. |
| Bandwidth | 10kHz (-3dB, small-signal) - sufficient for DC–100Hz battery charge/discharge profiling and transient detection. |
| Operating Temperature | -40°C to +85°C - qualified for extended industrial and automotive cabin environments. |
Pinout & Package
MAX9923HEUB+T is housed in a 10-pin µMAX® package (3mm × 3mm, 0.5mm pitch), RoHS-compliant and lead-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RSB | Input stage supply | Connected to RS+ or RS− to bias internal input transistors; enables operation at VCM up to +28V regardless of VDD. |
| 2 - RS+ | Positive current-sense input | High-side connection to load-side of sense resistor; tolerates up to +30V relative to GND. |
| 3 - RS− | Negative current-sense input | High-side connection to source-side of sense resistor; differential input defines VSENSE = VRS+ − VRS−. |
| 4 - N.C. | No connection | Not internally bonded; must remain floating - no routing or thermal pad connection required. |
| 5 - GND | Analog ground reference | Return path for internal circuitry and REF/SHDN logic; requires low-impedance local decoupling. |
| 6 - SHDN | Shutdown control input | Active-low logic input; drives <1µA total supply current when pulled to GND, enabling low-power sleep states. |
| 7 - REF | Output reference voltage | Set to GND for unidirectional output (0V to VOUT); set to VDD/2 for bidirectional output (±VOUT centered at VREF). |
| 8 - FB | Feedback input | Internally connected to 1kΩ laser-trimmed resistor (to REF); sets fixed 100V/V gain - no external components needed. |
| 9 - OUT | Voltage output | Rail-to-rail output (within 25mV of rails); VOUT = 100 × VSENSE + VREF; drives ADC inputs directly. |
| 10 - VDD | Power supply input | +2.85V to +5.5V supply; requires 0.1µF ceramic bypass capacitor to GND for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Laser-trimmed fixed gain | 100V/V with ±0.5% max accuracy - removes gain-setting resistor tolerance and layout sensitivity, improving BOM and production consistency. |
| Ultra-low offset drift | ±0.10 µV/°C (max) - maintains calibration stability across temperature without software compensation in battery management firmware. |
| Wide common-mode independence | 1.9V–28V input range, independent of VDD - supports single-supply operation while monitoring high-voltage rails like 24V industrial buses or multi-cell Li+ packs. |
| Autozeroing architecture | Spread-spectrum technique eliminating 1/f noise and long-term VOS drift - delivers stable DC accuracy for fuel-gauging and state-of-charge algorithms. |
| Bidirectional/unidirectional mode | Configurable via REF pin (GND or VDD/2) - enables single-part support for both charging/discharging detection and simple load-current monitoring. |
Applications
| Li+ Battery Charge/Discharge Monitoring | Notebook Power Rail Current Sensing |
|---|---|
|
Use Scenario: Real-time tracking of charge and discharge currents in a 3-cell Li+ battery pack (8.4V–12.6V) during USB-C PD charging and system load transitions. IC Role / Device Role / Timing Role: High-side current-sense amplifier converting mV-level sense resistor voltage into a 100× amplified, REF-referenced analog output for 12-bit ADC sampling. Use Value: ±20µV max VOS enables <1mA current resolution at 10mΩ RSENSE, supporting precise Coulomb counting and overcurrent protection without calibration drift. |
Use Scenario: Monitoring +5V and +3.3V CPU/GPU rail currents in ultrabook platforms to detect abnormal power draw and trigger thermal throttling. IC Role / Device Role / Timing Role: Precision high-side sensor interfacing between low-value sense resistor and system PMIC's analog monitor inputs. Use Value: 1.9V–28V common-mode range allows direct placement on 5V rail without level shifters; 700µA quiescent current minimizes impact on standby power budget. |
| Precision Industrial Load Current Monitoring | Medical Portable Device Battery Management |
|
Use Scenario: Measuring motor drive current in a 24V industrial actuator where VCM exceeds microcontroller supply voltage and EMI immunity is critical. IC Role / Device Role / Timing Role: Isolated high-side current amplifier providing rail-to-rail output referenced to system GND, compatible with isolated ADCs or optocoupled interfaces. Use Value: ±0.5% gain accuracy ensures repeatable trip thresholds for overcurrent protection; 10kHz bandwidth captures fast fault events without aliasing. |
Use Scenario: Low-power, long-life current monitoring in Class II medical handheld devices using single-cell Li+ batteries (2.7–4.2V) with strict IEC 62304 compliance requirements. IC Role / Device Role / Timing Role: Ultra-stable current-sense front-end feeding safety-critical battery management firmware with validated offset and gain performance over temperature. Use Value: <1µA shutdown current extends shelf life; ±0.10 µV/°C drift meets medical-grade calibration stability requirements without periodic 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 |
|---|---|---|---|
| MAX9923TEUB+T | Fixed 25V/V gain, ±25µV max VOS, same package and temp range | Lower gain suits higher full-scale sense voltages (>100mV), e.g., 100mΩ RSENSE at 1A | Select when lower gain improves SNR for larger sense resistors or reduces output swing limitations near supply rails. |
| MAX9923FEUB+T | Fixed 250V/V gain, ±10µV max VOS, same package and temp range | Higher gain enables sub-100µV sensing resolution but reduces dynamic range and bandwidth (2.5kHz) | Select when highest resolution is required for ultra-low-current loads (e.g., <100µA) and bandwidth >2.5kHz is not needed. |
Compared with MAX9923TEUB+T and MAX9923FEUB+T, the MAX9923HEUB+T provides optimal balance of resolution (±20µV VOS), dynamic range (100× gain), and bandwidth (10kHz) for mid-range battery current monitoring in portable electronics.
Availability
MAX9923HEUB+T is available at Aetrix Electronics and suitable for notebook/desktop power management, handheld Li+ battery current monitoring, and precision current sources requiring stable component supply across design-in, prototyping, and volume production phases.
Supply support for MAX9923HEUB+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, computing, and battery-powered applications.
The MAX9922/MAX9923 product line was engineered specifically for ultra-precision, high-side current sensing in portable and embedded systems where offset stability, wide common-mode range, and low power are non-negotiable.
FAQ
What is the maximum input common-mode voltage supported by the MAX9923HEUB+T?
The MAX9923HEUB+T supports an input common-mode voltage range of +1.9V to +28V, fully independent of its +2.85V to +5.5V supply voltage (VDD). This allows the device to accurately monitor current in high-voltage systems - such as 24V industrial rails or multi-cell Li+ battery packs - even when VCM exceeds VDD. The RSB, RS+, and RS− pins are rated to +30V relative to GND.
How does the MAX9923HEUB+T achieve ±20µV maximum input offset voltage over temperature?
The MAX9923HEUB+T achieves ±20µV max input offset voltage over -40°C to +85°C through a combination of laser-trimmed internal resistors, BiCMOS process optimization, and spread-spectrum autozeroing. This technique continuously measures and cancels input-stage offset in real time, suppressing 1/f noise and eliminating drift due to temperature or aging - a key enabler for long-term accuracy in battery fuel gauging applications.
Can the MAX9923HEUB+T be used for bidirectional current sensing, and how is it configured?
Yes, the MAX9923HEUB+T supports bidirectional current sensing. To enable this mode, connect the REF pin to VDD/2 (e.g., 1.65V for 3.3V supply). In this configuration, VOUT = 100 × VSENSE + VREF, so zero current yields VOUT = VREF, positive current raises VOUT, and negative current lowers it. For unidirectional use, tie REF to GND - then VOUT scales from 0V upward only.
What is the purpose of the FB pin on the MAX9923HEUB+T, and does it require external components?
The FB (feedback) pin on the MAX9923HEUB+T is internally connected to a laser-trimmed 1kΩ resistor that sets the fixed 100V/V gain. Unlike the adjustable MAX9922, no external resistors are required - the FB pin is used solely for optional noise reduction (e.g., 1nF capacitor to OUT). Connecting external components to FB will disrupt the factory-calibrated gain and is not recommended for MAX9923HEUB+T.
Does the MAX9923HEUB+T support rail-to-rail output, and what are its output voltage limits?
Yes, the MAX9923HEUB+T features rail-to-rail output capability, delivering VOUT within 25mV of either VDD or GND under light load. However, full gain accuracy is only guaranteed when VOUT remains ≥250mV away from the supply rails. For example, with VDD = 3.3V and REF = GND, linear operation is maintained from ~250mV to ~3.05V. Output swing is referenced to REF, not GND - critical for bidirectional configurations.
MAX9923HEUB+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Current Sense
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 0.4V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 10 kHz
- Current - Input Bias:
- 1 pA
- Voltage - Input Offset:
- 0.2 µV
- Current - Supply:
- 780µA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 2.85 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-uMAX/uSOP
MAX9923HEUB+T FAQ
1.How can I place an order for MAX9923HEUB+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX9923HEUB+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 MAX9923HEUB+T reliable?
The price and inventory of MAX9923HEUB+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX9923HEUB+T is usually 5 days.
3.What payment methods are accepted for MAX9923HEUB+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX9923HEUB+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX9923HEUB+T?
MAX9923HEUB+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX9923HEUB+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 MAX9923HEUB+T?
For technical support, including MAX9923HEUB+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX9923HEUB+T requirements.
6.How does Aetrix verify that MAX9923HEUB+T is sourced from the original manufacturer or authorized distributors?
All MAX9923HEUB+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 MAX9923HEUB+T meets industry standards.
7.What is the process for return or replacement of MAX9923HEUB+T?
All MAX9923HEUB+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX9923HEUB+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 MAX9923HEUB+T part is unused and in its original packaging.
Return procedure for MAX9923HEUB+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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