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Analog Devices Inc./Maxim Integrated MAX9922EUB+
- Part No.:
- MAX9922EUB+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX9922EUB+.pdf
- Description:
- IC CURR SENSE 1 CIRCUIT 10UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:117
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Product details
Overview
MAX9922EUB+ from Maxim Integrated is an ultra-precision, high-side current-sense amplifier with adjustable gain, ±10µV 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 precise bidirectional or unidirectional battery current monitoring in space-constrained portable power systems.
For engineers reviewing the MAX9922EUB+ datasheet, MAX9922EUB+ pinout, MAX9922EUB+ application, or MAX9922EUB+ equivalent, this page delivers verified technical context, validated pin functions, real-world application mappings, and confirmed alternative options for high-accuracy, high-common-mode current sensing designs.
Technical Context
The MAX9922EUB+ uses spread-spectrum autozeroing to maintain <25µV max offset and eliminate 1/f noise and thermal drift, combined with indirect current-feedback architecture that converts differential input voltage to precision current for error minimization. Its RSB pin supplies the input stage directly from the sense node, enabling operation up to 28V common-mode while powered from only +2.85V to +5.5V.
Gain is set externally via resistive divider between OUT–FB–REF (AV = 1 + R₂/R₁), supporting user-defined scaling; REF accepts GND for unidirectional output or VDD/2 for symmetric ±VOUT bidirectional operation. Shutdown logic on SHDN reduces supply current to <1µA without affecting input bias integrity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Offset Voltage (max) | ±10µV over –40°C to +85°C - enables accurate measurement of sub-10mV sense voltages without calibration |
| Gain Accuracy (max) | ±0.5% - ensures full-scale current reading error remains under ±0.5% across temperature and supply variation |
| Common-Mode Range | +1.9V to +28V, independent of VDD - supports direct sensing on Li+ batteries down to 1.9V and high-voltage rails above VDD |
| Supply Voltage Range | +2.85V to +5.5V - compatible with single-cell Li+ and 3.3V/5V system rails |
| Quiescent Current | 700µA typical - allows continuous monitoring in battery-powered devices with minimal runtime impact |
| Shutdown Current | <1µA - preserves battery life during system sleep modes without disconnecting sense path |
| Bandwidth (AV=100) | 10kHz - sufficient for DC–10kHz current transients in power management and battery charge/discharge control |
Pinout & Package
MAX9922EUB+ is housed in a 10-pin µMAX® package (3mm × 3mm, 0.5mm pitch), optimized for high-density PCB layouts in portable electronics.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RSB | Input Stage Supply | Connects directly to RS+ or RS− to power internal input circuitry - enables operation at up to 28V common-mode regardless of VDD |
| 2 - RS+ | Positive Sense Input | High-side current-sense resistor terminal; forms differential pair with RS− to measure VSENSE |
| 3 - RS− | Negative Sense Input | Completes differential sense path; referenced to RSB for rail-to-rail common-mode tolerance |
| 4 - N.C. | No Connection | Not internally bonded - must remain floating; no routing or soldering required |
| 5 - GND | Analog Ground Reference | Return path for internal circuitry and external decoupling capacitor; separate from load ground |
| 6 - SHDN | Logic Shutdown Control | Active-low digital input: GND = shutdown (<1µA IDD), VDD = active operation |
| 7 - REF | Output Reference Voltage | GND = unidirectional output; VDD/2 = bidirectional zero-crossing point for charge/discharge detection |
| 8 - FB | Feedback Gain-Set Node | Connects to external R₁/R₂ divider to define gain (AV = 1 + R₂/R₁); optional 1nF cap reduces noise |
| 9 - OUT | Voltage Output | Rail-to-rail output proportional to VSENSE × gain + VREF; settles within 1% in 200µs (CL = 7pF) |
| 10 - VDD | Power Supply Input | +2.85V to +5.5V supply; requires 0.1µF ceramic bypass to GND adjacent to pin |
Key Features
| Feature | Design Value |
|---|---|
| Spread-spectrum autozeroing | Eliminates 1/f noise and drift - maintains ±10µV max VOS over full –40°C to +85°C range |
| Indirect current-feedback architecture | Decouples gain accuracy from op-amp open-loop limitations - achieves ±0.5% full-scale gain error |
| RSB-supplied input stage | Enables 1.9V–28V common-mode sensing independent of VDD - supports battery-down-to-1.9V monitoring |
| Adjustable gain via external resistors | AV = 1 + R₂/R₁ - allows precise scaling for custom sense-resistor values and ADC input ranges |
| Bidirectional/unidirectional mode selection | REF pin configures output polarity - simplifies firmware handling of charge/discharge states in battery gauging |
Applications
| Li+ Battery Charge/Discharge Monitoring | Notebook System Power Management |
|---|---|
Use Scenario: Real-time tracking of battery current during charging (source) and discharging (sink) cycles in ultraportable notebooks. IC Role / Device Role / Timing Role: High-side current-sense amplifier converting mV-level sense resistor voltage into amplified, referenced analog output for ADC sampling. Use Value: ±10µV offset enables sub-10mA resolution at 10mΩ sense resistance, critical for accurate coulomb counting and state-of-charge estimation. |
Use Scenario: Dynamic load current profiling across CPU, GPU, and memory rails to optimize adaptive voltage scaling and thermal throttling. IC Role / Device Role / Timing Role: Precision current monitor feeding real-time telemetry to system controller for closed-loop power budgeting. Use Value: 1.9V–28V common-mode range allows direct sensing on buck converter outputs without level-shifting, preserving signal integrity. |
| Industrial 4–20mA Loop Transmitter | Medical Infusion Pump Motor Current Control |
Use Scenario: High-accuracy current sourcing in loop-powered field instruments where sensor excitation and signal transmission share same 2-wire path. IC Role / Device Role / Timing Role: High-side sense amplifier providing feedback to current-regulating DAC or op-amp driver stage. Use Value: 0.5% gain accuracy ensures 4–20mA output compliance within ±0.1mA over temperature and supply variation. |
Use Scenario: Closed-loop motor current regulation in battery-operated infusion pumps requiring precise flow-rate control and stall detection. IC Role / Device Role / Timing Role: High-side current monitor feeding safety-critical microcontroller for real-time torque and occlusion detection. Use Value: <1µA shutdown current extends battery life during standby; ±10µV offset enables reliable detection of <5mA stall currents. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-precision, high-side current-sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX40056AUB+ (Maxim) | Fixed 50V/V gain, ±5µV max VOS, 2.7V–5.5V supply, 2.5V–36V common-mode | Optimized for fixed-gain, lower-offset applications where external gain-setting complexity is undesirable | Select when highest offset performance (±5µV) and wider common-mode (up to 36V) outweigh need for adjustable gain |
| INA240A1DGNR (TI) | Fixed 20V/V gain, ±20µV max VOS, 2.7V–5.5V supply, 0V–80V common-mode, integrated ESD protection | Supports higher common-mode (80V) and includes robust input protection for industrial motor drives | Select for 48V+ bus monitoring or harsh environments requiring built-in ±4kV HBM ESD protection |
Compared with MAX40056AUB+, the MAX9922EUB+ trades 5µV offset for user-configurable gain and lower cost per design iteration; versus INA240A1DGNR, it offers superior offset (±10µV vs ±20µV) and smaller µMAX footprint but lacks integrated ESD hardening and 80V common-mode capability.
Availability
MAX9922EUB+ is available at Aetrix Electronics and suitable for notebook power management, handheld Li+ battery monitoring, and precision current source applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX9922EUB+ 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 portable applications.
The MAX9922EUB+ belongs to Maxim's ultra-precision current-sense amplifier product line, engineered specifically for high-accuracy, high-common-mode, low-power current monitoring in battery-powered and space-constrained systems.
FAQ
What is the maximum input common-mode voltage supported by the MAX9922EUB+?
The MAX9922EUB+ supports an input common-mode voltage range of +1.9V to +28V, fully independent of its VDD supply voltage. This allows the device to accurately monitor current on high-voltage rails - such as 24V industrial buses or fully charged Li+ battery stacks - even when powered from a low 3.3V system rail. The RSB pin architecture enables this wide range by powering the input stage directly from the sense node.
How is gain configured on the MAX9922EUB+?
Gain on the MAX9922EUB+ is set externally using two resistors (R₁ and R₂) connected between OUT, FB, and REF pins, following the formula AV = 1 + R₂/R₁. This adjustable configuration allows designers to precisely match the amplifier's output span to their ADC's input range or system dynamic requirements. Unlike fixed-gain variants (e.g., MAX9923T), the MAX9922EUB+ does not contain internal laser-trimmed resistors - all gain-setting components are external and user-selectable.
Can the MAX9922EUB+ operate in bidirectional current-sense mode?
Yes, the MAX9922EUB+ supports both unidirectional and bidirectional operation. To enable bidirectional sensing, connect the REF pin to VDD/2 - this establishes a zero-current reference point so that positive VSENSE produces an output above VREF (discharge) and negative VSENSE produces an output below VREF (charge). This mode is essential for accurate battery coulomb counting and state-of-charge algorithms in portable electronics.
What is the shutdown current consumption of the MAX9922EUB+?
The MAX9922EUB+ draws less than 1µA of supply current in shutdown mode when the SHDN pin is driven low. During shutdown, both VDD supply current and current drawn from the RSB, RS+, and RS− pins remain below 1µA each, preserving battery energy without breaking the high-side sense path. Normal operation resumes within 800µs after SHDN is pulled high.
Does the MAX9922EUB+ require external decoupling capacitors?
Yes, the MAX9922EUB+ requires a 0.1µF ceramic capacitor placed as close as possible between VDD and GND pins to ensure stable operation and minimize supply-induced noise coupling. Additionally, a ~1nF capacitor may be added between OUT and FB for optional noise reduction - this lowers output broadband noise and attenuates 20kHz autozero ripple, at the expense of reduced signal bandwidth.
MAX9922EUB+ 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:
- 0.1 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
MAX9922EUB+ FAQ
1.How can I place an order for MAX9922EUB+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX9922EUB+ 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 MAX9922EUB+ reliable?
The price and inventory of MAX9922EUB+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX9922EUB+ is usually 5 days.
3.What payment methods are accepted for MAX9922EUB+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX9922EUB+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX9922EUB+?
MAX9922EUB+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX9922EUB+ 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 MAX9922EUB+?
For technical support, including MAX9922EUB+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX9922EUB+ requirements.
6.How does Aetrix verify that MAX9922EUB+ is sourced from the original manufacturer or authorized distributors?
All MAX9922EUB+ 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 MAX9922EUB+ meets industry standards.
7.What is the process for return or replacement of MAX9922EUB+?
All MAX9922EUB+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX9922EUB+, 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 MAX9922EUB+ part is unused and in its original packaging.
Return procedure for MAX9922EUB+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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