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Analog Devices Inc./Maxim Integrated MAX9923FEUB+
- Part No.:
- MAX9923FEUB+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX9923FEUB+.pdf
- Description:
- IC CURR SENSE 1 CIRCUIT 10UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:3,449
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Product details
Overview
The MAX9923FEUB+ from Maxim Integrated is an ultra-precision, high-side current-sense amplifier with fixed 250V/V gain, ±10µV max input offset voltage over temperature, ±0.8% max gain accuracy across -40°C to +85°C, and 1.9V–28V input common-mode voltage range independent of supply. It enables accurate bidirectional battery current monitoring in Li+-powered portable systems where minimal sense voltage (e.g., 10mV full-scale) and rail-to-rail output are critical.
For engineers reviewing the MAX9923FEUB+ datasheet, MAX9923FEUB+ pinout, MAX9923FEUB+ application, or MAX9923FEUB+ equivalent, key selection criteria include its laser-trimmed 250V/V fixed gain, sub-1µA shutdown current, spread-spectrum autozeroing architecture for drift-free operation, and µMAX package compatibility with space-constrained PCB layouts.
Technical Context
The MAX9923FEUB+ implements Maxim's indirect current-feedback architecture: differential input voltage is converted to a precision current, then compared against a feedback current derived from VOUT/GAIN, enabling ultra-low offset and high CMRR (121–140dB). Its spread-spectrum autozeroing continuously measures and cancels input offset, eliminating 1/f noise and thermal drift.
It supports both unidirectional (REF = GND) and bidirectional (REF = VDD/2) operation, with output swing within 25mV of rails and full accuracy maintained only when VOUT stays ≥250mV from supply rails. Input differential range is specified up to ±150mV, but linear operation is not guaranteed beyond that limit.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | Fixed 250V/V - eliminates external resistor network, reduces layout sensitivity and component count |
| Input Offset Voltage (max) | ±10µV over -40°C to +85°C - enables accurate measurement of ≤40mV sense voltage at 0.1% error |
| Gain Accuracy (max) | ±0.8% over temperature - ensures consistent current scaling without calibration across operating range |
| Common-Mode Input Range | +1.9V to +28V, independent of VDD - allows direct sensing on batteries as low as 1.9V or high-voltage rails >5.5V |
| Supply Current | 700µA typical at 3.0V - minimizes system power overhead in always-on monitoring applications |
| Shutdown Current | <1µA - preserves battery life during sleep modes in portable equipment |
| Small-Signal Bandwidth | 2.5kHz - sufficient for DC–slow transient battery charge/discharge profiling, not high-speed switching |
Pinout & Package
MAX9923FEUB+ is housed in a 10-pin µMAX® package (3mm × 3mm, 0.5mm pitch), RoHS-compliant, with exposed pad for thermal enhancement. Pin 4 (N.C.) is not internally connected and must remain floating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 RSB | Input stage supply | Connected to RS+ or RS− to bias internal transconductance stage; enables operation at VCM up to 28V regardless of VDD |
| 2 RS+ | Positive current-sense input | High-side connection to sense resistor's load-side terminal; referenced to RSB, not GND |
| 3 RS− | Negative current-sense input | High-side connection to sense resistor's source-side terminal; completes differential input path |
| 4 N.C. | No connection | Not bonded; must be left unconnected and unstubbed on PCB |
| 5 GND | Analog ground reference | Return path for internal circuitry; requires low-impedance connection to system ground plane |
| 6 SHDN | Logic shutdown control | Active-low input; drives low to reduce total supply current to <1µA; compatible with 3.3V/5V logic |
| 7 REF | Bidirectional reference input | Set to GND for unidirectional output; set to VDD/2 for symmetric ±VOUT swing around reference |
| 8 FB | Fixed-gain feedback node | Internally tied to 1kΩ resistor between FB and REF; no external components required for gain setting |
| 9 OUT | Voltage output | Rail-to-rail output proportional to VSENSE × 250; VOUT = 250 × (RS+ − RS−) + VREF |
| 10 VDD | Power supply input | +2.85V to +5.5V single supply; requires 0.1µF ceramic bypass capacitor to GND adjacent to pin |
Key Features
| Feature | Design Value |
|---|---|
| Laser-trimmed 250V/V gain | Eliminates external gain-setting resistors, removes matching errors, and improves long-term stability vs. adjustable variants |
| Spread-spectrum autozeroing | Reduces 1/f noise and eliminates offset drift over time and temperature - maintains ±10µV max VOS across full temp range |
| Indirect current-feedback architecture | Decouples input common-mode rejection from op-amp open-loop gain, achieving 121–140dB CMRR independent of VCM |
| 1.9V–28V input common-mode range | Supports direct sensing on Li+ cells down to 1.9V and high-side monitoring in 24V industrial systems without level-shifting |
| Rail-to-rail output with 25mV headroom | Maximizes dynamic range for ADC interfacing while maintaining full accuracy only within 250mV of supply rails |
Applications
| Li+ Battery Charge/Discharge Monitoring | Precision Power Supply Current Sensing |
|---|---|
Use Scenario: Real-time tracking of charging current into and discharging current from a single-cell Li+ battery in a handheld medical device. IC Role / Device Role / Timing Role: High-side current-sense amplifier converting mV-level sense resistor voltage to amplified, referenced analog output for 12-bit ADC digitization. Use Value: ±10µV offset enables detection of ≤40mV sense voltage at 0.1% error, supporting accurate coulomb counting with 10mV full-scale resolution. |
Use Scenario: Monitoring output current of a programmable bench power supply delivering 0–3A at 0–30V with <0.5% line regulation. IC Role / Device Role / Timing Role: High-side current sensor feeding isolated ADC, providing real-time current readback and overcurrent protection trigger. Use Value: 250V/V gain and 28V common-mode range allow direct sensing on high-side output rail without shunt relocation or level-shifting circuitry. |
| Portable Instrumentation Current Profiling | Industrial Motor Driver Phase Current Sensing |
Use Scenario: Measuring quiescent and active current consumption of a low-power IoT sensor node powered by coin-cell or energy-harvesting source. IC Role / Device Role / Timing Role: Ultra-low-offset amplifier enabling microamp-level current resolution via small-value sense resistor (e.g., 100mΩ). Use Value: 700µA quiescent current and sub-1µA shutdown minimize self-loading; ±10µV VOS permits use of 10mV full-scale sensing for highest efficiency. |
Use Scenario: High-side phase current sensing in a 24V BLDC motor driver for closed-loop torque control in factory automation equipment. IC Role / Device Role / Timing Role: Precision current amplifier interfaced to isolated sigma-delta ADC, rejecting common-mode noise from PWM switching. Use Value: 140dB CMRR and 2.5kHz bandwidth suppress PWM-induced ripple while preserving true DC current magnitude for control loop stability. |
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 |
|---|---|---|---|
| MAX4008AUA+ | 200V/V fixed gain, ±25µV max VOS, 1.2V–28V VCM, 1.8V–5.5V supply | Lower gain and higher offset; suited for less demanding accuracy requirements | Select when 200V/V gain suffices and wider supply voltage range (down to 1.8V) is needed |
| INA240A1DGNR | 20V/V fixed gain, ±100µV max VOS, 2.7V–80V VCM, 2.7V–5.5V supply | Higher VCM range but lower gain and higher offset; optimized for high-voltage motor drives | Select for 80V systems where 20V/V gain and higher offset tolerance are acceptable |
Compared with MAX4008AUA+ and INA240A1DGNR, the MAX9923FEUB+ delivers the highest gain (250V/V) and lowest offset (±10µV) in a 10-pin µMAX package, making it optimal for space-constrained, ultra-precision Li+ battery monitoring - whereas alternatives trade offset or gain for broader supply or common-mode ranges.
Availability
MAX9923FEUB+ 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 industrial and medical OEM programs.
Supply support for MAX9923FEUB+ 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 performance applications in industrial, medical, and portable electronics.
The MAX9922/MAX9923 family was developed specifically for ultra-precision high-side current sensing in battery-powered systems, emphasizing minimal offset drift, wide common-mode range, and flexible unidirectional/bidirectional operation.
FAQ
What is the maximum input common-mode voltage supported by the MAX9923FEUB+?
The MAX9923FEUB+ supports an input common-mode voltage range of +1.9V to +28V, fully independent of the VDD supply voltage. This allows direct high-side sensing on Li+ batteries as low as 1.9V or industrial 24V rails without level-shifting. The RSB pin must be connected to either RS+ or RS− to enable this extended range, and absolute maximum ratings limit RSB/RS+/RS− to +30V relative to GND.
How does the MAX9923FEUB+ achieve ±10µV maximum input offset voltage over temperature?
The MAX9923FEUB+ achieves ±10µV max input offset voltage over -40°C to +85°C through a combination of laser-trimmed internal resistors and Maxim's spread-spectrum autozeroing technique. This architecture continuously measures and cancels input offset in real time, eliminating drift due to temperature and time, and suppressing 1/f noise - a key differentiator from conventional chopper-stabilized amplifiers.
Can the MAX9923FEUB+ operate in bidirectional current-sense mode, and how is it configured?
Yes, the MAX9923FEUB+ supports bidirectional operation by connecting the REF pin to VDD/2, resulting in VOUT = 250 × (RS+ − RS−) + VREF. When VSENSE = 0, VOUT equals VREF; positive VSENSE produces VOUT > VREF (charge), and negative VSENSE produces VOUT < VREF (discharge). For unidirectional use, connect REF to GND. The internal 1kΩ resistor between FB and REF ensures proper gain setting without external components.
What is the purpose of the RSB pin on the MAX9923FEUB+, and how should it be connected?
The RSB (Reference Sense Bias) pin on the MAX9923FEUB+ supplies bias current to the input transconductance stage and sets the common-mode operating point for RS+ and RS−. It must be connected directly to either RS+ or RS− - never to GND or VDD. This connection enables the full +1.9V to +28V input common-mode range independent of VDD and ensures correct internal node biasing for high-side sensing functionality.
Does the MAX9923FEUB+ require external components for gain configuration, and what is its gain tolerance?
No, the MAX9923FEUB+ uses internal laser-trimmed resistors to fix its gain at 250V/V - no external resistors are required. Its gain accuracy is ±0.8% maximum over the full -40°C to +85°C temperature range, as specified in the Electrical Characteristics table. This eliminates resistor matching errors and improves long-term stability compared to adjustable-gain variants like the MAX9922.
MAX9923FEUB+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- Current Sense
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 0.4V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 2.5 kHz
- Current - Input Bias:
- 1 pA
- Voltage - Input Offset:
- 0.1 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
MAX9923FEUB+ FAQ
1.How can I place an order for MAX9923FEUB+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX9923FEUB+ 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 MAX9923FEUB+ reliable?
The price and inventory of MAX9923FEUB+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX9923FEUB+ is usually 5 days.
3.What payment methods are accepted for MAX9923FEUB+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX9923FEUB+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX9923FEUB+?
MAX9923FEUB+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX9923FEUB+ 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 MAX9923FEUB+?
For technical support, including MAX9923FEUB+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX9923FEUB+ requirements.
6.How does Aetrix verify that MAX9923FEUB+ is sourced from the original manufacturer or authorized distributors?
All MAX9923FEUB+ 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 MAX9923FEUB+ meets industry standards.
7.What is the process for return or replacement of MAX9923FEUB+?
All MAX9923FEUB+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX9923FEUB+, 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 MAX9923FEUB+ part is unused and in its original packaging.
Return procedure for MAX9923FEUB+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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