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Analog Devices Inc./Maxim Integrated MAX9923HEUB+
- Part No.:
- MAX9923HEUB+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX9923HEUB+.pdf
- Description:
- IC CURR SENSE 1 CIRCUIT 10UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:2,326
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Product details
Overview
MAX9923HEUB+ 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+ datasheet, MAX9923HEUB+ pinout, MAX9923HEUB+ application, or MAX9923HEUB+ equivalent, key selection criteria include its laser-trimmed 100V/V gain, ultra-low offset drift (±0.10 µV/°C), shutdown current <1µA, rail-to-rail output swing, and operation from +2.85V to +5.5V supply - all in a 10-pin µMAX package.
Technical Context
The MAX9923HEUB+ employs spread-spectrum autozeroing to continuously cancel input offset voltage, eliminating 1/f noise and drift over time and temperature. Its indirect current-feedback architecture converts differential sense voltage to precision current, then compares it against a feedback-derived current to minimize error.
This architecture supports both unidirectional (REF = GND) and bidirectional (REF = VDD/2) operation, with output referenced to REF. The device maintains ±0.75% gain accuracy across -40°C to +85°C and delivers 10kHz small-signal bandwidth at 100V/V gain while drawing only 700µA quiescent current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | Fixed 100V/V - provides precise scaling for 10mV–100mV sense voltages without external resistors. |
| Input Offset Voltage (max) | ±20µV over -40°C to +85°C - enables sub-1mA current resolution with 10mΩ sense resistor. |
| Gain Accuracy (max) | ±0.5% - ensures measurement consistency across production units without calibration. |
| Common-Mode Range | +1.9V to +28V, independent of VDD - allows direct sensing on Li+ batteries (≥1.9V) and 24V industrial rails. |
| Supply Voltage | +2.85V to +5.5V - compatible with 3.3V and 5V logic domains while supporting wide-input systems. |
| Quiescent Current | 700µA - minimizes system power overhead in always-on battery monitoring applications. |
| Shutdown Current | <1µA - extends battery life during sleep modes without sacrificing wake-up speed (800µs power-up). |
Pinout & Package
The MAX9923HEUB+ is housed in a 10-pin µMAX® package (3mm × 3mm, 0.5mm pitch), RoHS-compliant and rated for -40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 RSB | Input stage supply | Connected to RS+ or RS− to bias internal transconductance stage; supports up to 28V common-mode. |
| 2 RS+ | Positive current-sense input | High-side connection to sense resistor's load-side terminal; handles up to +28V. |
| 3 RS− | Negative current-sense input | High-side connection to sense resistor's source-side terminal; completes differential measurement path. |
| 4 N.C. | No connection | Not internally bonded; must be left floating or grounded per layout best practices. |
| 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 to GND for <1µA shutdown, to VDD for normal operation. |
| 7 REF | Output reference voltage | Sets zero-current output level: GND for unidirectional, VDD/2 for bidirectional full-range sensing. |
| 8 FB | Feedback node | Internally connected to 1kΩ laser-trimmed resistor (to REF); enables optional 1nF noise-reduction capacitor to OUT. |
| 9 OUT | Voltage output | Rail-to-rail output proportional to VSENSE × 100 + VREF; settles to 1% in 200µs with 7pF load. |
| 10 VDD | Power supply input | +2.85V to +5.5V analog supply; requires 0.1µF ceramic bypass capacitor to GND. |
Key Features
| Feature | Design Value |
|---|---|
| Laser-trimmed fixed gain | 100V/V with ±0.5% accuracy eliminates external gain-setting resistors and layout sensitivity. |
| Spread-spectrum autozeroing | Reduces input offset to ±20µV max and drift to ±0.10 µV/°C - critical for long-term battery SOC accuracy. |
| Wide common-mode independence | 1.9V–28V input range operates regardless of VDD, enabling direct sensing on low-voltage batteries and high-voltage rails. |
| Rail-to-rail output with 25mV headroom | Delivers full dynamic range down to 25mV from supply rails - maximizes ADC utilization in 12-bit systems. |
| Ultra-low shutdown current | <1µA shutdown draw extends standby time in portable devices without compromising wake-up latency. |
Applications
| Li+ Battery Charge/Discharge Monitoring | Precision Power Supply Current Feedback |
|---|---|
Use Scenario: Real-time tracking of charge/discharge cycles in notebook or tablet battery packs with 1.9V–28V operating range. IC Role / Device Role / Timing Role: High-side current-sense amplifier converting mV-level sense resistor voltage to amplified, REF-referenced bipolar output. Use Value: ±20µV offset enables ≤0.5mA current resolution with 20mΩ sense resistor, supporting accurate state-of-charge estimation over full temperature range. |
Use Scenario: Closed-loop current regulation in programmable lab power supplies delivering up to 24V/5A with digital control. IC Role / Device Role / Timing Role: High-accuracy analog current feedback element interfacing between sense resistor and DAC-controlled output stage. Use Value: 100V/V fixed gain and ±0.5% accuracy eliminate gain calibration, reducing firmware complexity and BOM count. |
| Industrial 24V System Load Monitoring | Medical Portable Device Power Management |
Use Scenario: Continuous current surveillance of motor drivers or solenoid loads in factory automation equipment powered from 24V rails. IC Role / Device Role / Timing Role: High-side monitor providing isolated current data to microcontroller ADC via rail-to-rail output. Use Value: 28V common-mode tolerance and 700µA supply current enable direct integration into compact, thermally constrained enclosures. |
Use Scenario: Low-power current sensing in battery-operated infusion pumps requiring FDA-grade accuracy and long runtime. IC Role / Device Role / Timing Role: Ultra-low-drift amplifier feeding precision ADC for real-time motor current and battery health diagnostics. Use Value: ±0.10 µV/°C offset drift ensures stable calibration across clinical operating temperatures (10°C–40°C), reducing recalibration frequency. |
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 |
|---|---|---|---|
| INA240A1QDGKRQ1 | 50V/V fixed gain, ±100µV offset (max), AEC-Q100 qualified, wider supply (2.7V–5.5V) | Automotive-grade; higher offset limits resolution in low-current medical or portable use cases | Select for automotive systems requiring qualification; avoid when ±20µV offset is mandatory for sub-mA resolution. |
| MAX40056ATA+T | 100V/V gain, ±150µV offset (max), 2.7V–5.5V supply, 1.2MHz bandwidth | Higher bandwidth but 7.5× higher offset; no autozeroing - drift dominates over temperature | Choose for high-speed transient detection where offset stability is secondary; not suitable for precision DC monitoring. |
Compared with INA240A1QDGKRQ1 and MAX40056ATA+T, the MAX9923HEUB+ delivers superior DC accuracy (±20µV vs. ±100µV/±150µV) and thermal stability (±0.10 µV/°C vs. unspecified drift), making it optimal for battery fuel gauging and precision power feedback where long-term offset integrity is critical.
Availability
MAX9923HEUB+ 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 design cycles.
Supply support for MAX9923HEUB+ 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.
The MAX9923HEUB+ belongs to the MAX9922/MAX9923 ultra-precision high-side current-sense amplifier family, engineered specifically for applications requiring nanovolt-level offset stability, wide common-mode operation, and minimal power overhead in portable and industrial power systems.
FAQ
What is the maximum input common-mode voltage supported by the MAX9923HEUB+?
The MAX9923HEUB+ supports an input common-mode voltage range of +1.9V to +28V, fully independent of its VDD supply voltage. This allows direct sensing on low-voltage Li+ batteries (down to 1.9V) and high-voltage industrial rails (up to 28V) without level-shifting circuitry. The specification is guaranteed over the full -40°C to +85°C temperature range and applies to both RS+ and RS− pins relative to GND.
Does the MAX9923HEUB+ require external gain-setting resistors?
No, the MAX9923HEUB+ does not require external gain-setting resistors. It uses an internal laser-trimmed resistor network to deliver a fixed gain of 100V/V with ±0.5% accuracy over temperature. The FB pin is internally connected to a 1kΩ resistor tied to REF, eliminating component count, layout sensitivity, and resistor matching errors associated with adjustable-gain variants like the MAX9922.
How does the MAX9923HEUB+ achieve its ultra-low input offset voltage?
The MAX9923HEUB+ achieves ±20µV (max) input offset voltage using a spread-spectrum autozeroing technique that continuously measures and cancels input offset in real time. This eliminates 1/f noise and drift over time and temperature. Combined with laser trimming during wafer test, this architecture ensures stable DC accuracy without external calibration - a key differentiator versus conventional amplifiers relying solely on trimming.
Can the MAX9923HEUB+ operate in bidirectional current-sense mode?
Yes, the MAX9923HEUB+ supports bidirectional current sensing. To enable this mode, connect the REF pin to VDD/2. This sets the output zero-current level at mid-supply, allowing positive VSENSE (load current flow direction) to produce an output above VREF and negative VSENSE (reverse current) to produce an output below VREF. The device maintains full accuracy and rail-to-rail output swing in both directions.
What is the shutdown current consumption of the MAX9923HEUB+?
The MAX9923HEUB+ draws less than 1µA total supply current in shutdown mode when the SHDN pin is driven low. This includes current drawn from both VDD and the current-sense inputs (RSB, RS+, RS−). The shutdown state is fully specified over -40°C to +85°C and enables rapid wake-up with 800µs power-up time to 0.1% final value, making it ideal for battery-powered systems requiring extended standby duration.
MAX9923HEUB+ 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:
- 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+ FAQ
1.How can I place an order for MAX9923HEUB+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX9923HEUB+ 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+ reliable?
The price and inventory of MAX9923HEUB+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX9923HEUB+ is usually 5 days.
3.What payment methods are accepted for MAX9923HEUB+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX9923HEUB+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX9923HEUB+?
MAX9923HEUB+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX9923HEUB+ 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+?
For technical support, including MAX9923HEUB+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX9923HEUB+ requirements.
6.How does Aetrix verify that MAX9923HEUB+ is sourced from the original manufacturer or authorized distributors?
All MAX9923HEUB+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX9923HEUB+?
All MAX9923HEUB+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX9923HEUB+, 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+ part is unused and in its original packaging.
Return procedure for MAX9923HEUB+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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