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Analog Devices Inc./Maxim Integrated MAX9922EUB+T
- Part No.:
- MAX9922EUB+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX9922EUB+T.pdf
- Description:
- IC CURR SENSE 1 CIRCUIT 10UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:5,446
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Product details
Overview
MAX9922EUB+T 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 accurate bidirectional or unidirectional battery current monitoring in space-constrained portable power systems.
For engineers reviewing the MAX9922EUB+T datasheet, MAX9922EUB+T pinout, MAX9922EUB+T application, or MAX9922EUB+T equivalent, this page delivers verified specifications, validated pin functions, confirmed operating modes (unidirectional/bidirectional), real-world use cases, and two rigorously cross-checked alternative parts for precision high-side sensing designs.
Technical Context
The MAX9922EUB+T employs 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 sense voltage to precision current for error minimization. Its RSB pin connects directly to either RS+ or RS− to support wide common-mode operation up to 28V.
Gain is set externally via resistive divider between OUT, FB, and REF (AV = 1 + R₂/R₁), enabling user-defined scaling from 5V/V to >1000V/V. The device operates from +2.85V to +5.5V supply while drawing only 700µA quiescent current and supports shutdown mode with <1µA supply current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Offset Voltage (max) | ±10µV over −40°C to +85°C - enables sub-mA current resolution with 10mΩ sense resistor |
| Gain Accuracy (max) | ±0.5% - ensures calibrated current measurement without system-level trimming |
| Common-Mode Range | +1.9V to +28V, independent of VDD - allows direct sensing on Li+-battery rails down to 1.9V or 24V industrial buses |
| Supply Voltage | +2.85V to +5.5V - compatible with single-cell Li+ and 3.3V/5V logic domains |
| Quiescent Current | 700µA typical - supports always-on battery monitoring with minimal drain |
| Shutdown Current | <1µA - extends runtime in sleep-mode portable devices |
| Bandwidth (−3dB) | 10kHz at AV = 100 - sufficient for DC–100Hz battery charge/discharge profiling |
Pinout & Package
MAX9922EUB+T is housed in a 10-pin µMAX® package (3mm × 3mm, 0.5mm pitch), RoHS-compliant, rated for −40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RSB | Input stage supply rail | Connected to RS+ or RS− to bias internal transconductance stages; enables 28V common-mode operation |
| 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 with RS+ defines VSENSE |
| 4 - N.C. | No internal connection | Must remain unconnected; no routing or copper allowed |
| 5 - GND | Analog ground reference | Return path for internal circuitry; requires low-impedance star connection to minimize offset errors |
| 6 - SHDN | Logic-controlled shutdown enable | Active-low input; drives to GND for <1µA shutdown current, VDD for normal operation |
| 7 - REF | Reference voltage input | Sets output zero point: GND for unidirectional, VDD/2 for symmetric bidirectional output swing |
| 8 - FB | Feedback node for gain-setting network | Connects external R₁/R₂ divider between OUT and REF to define precise gain (AV = 1 + R₂/R₁) |
| 9 - OUT | Voltage output | Rail-to-rail output (within 25mV of rails); VOUT = AV × VSENSE + VREF - linear over ±150mV VSENSE |
| 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 |
|---|---|
| Spread-spectrum autozeroing | Eliminates 1/f noise and drift - maintains ±10µV max VOS across full temperature range |
| Indirect current-feedback architecture | Converts VSENSE to precision current, enabling high CMRR (121–140dB) and stable gain vs. common-mode |
| Adjustable gain via external resistors | Supports custom scaling (e.g., 100V/V for 10mΩ/100mA full-scale) without changing IC or layout |
| Bidirectional/unidirectional mode selection | Configured solely by REF connection - no firmware or external switches required |
| Ultra-low input bias current (1pA) | Prevents loading of high-impedance REF sources and eliminates resistor-divider errors |
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 3.7V Li+ cell in a handheld medical device. IC Role / Device Role / Timing Role: High-side current-sense amplifier converting mV-level VSENSE across 50mΩ shunt into amplified bipolar output referenced to VDD/2. Use Value: ±10µV VOS enables ±0.2mA absolute current accuracy at 100mA full-scale, critical for battery fuel gauging and safety cutoff. |
Use Scenario: Monitoring output current of a 24V industrial DC-DC converter supplying programmable logic controllers. IC Role / Device Role / Timing Role: High-side sense amplifier interfaced to 12-bit ADC, rejecting 24V common-mode noise while resolving 10mA steps. Use Value: 1.9V–28V common-mode range allows direct placement on 24V rail; 0.5% gain accuracy eliminates per-unit calibration. |
| Notebook System Power Management | Precision Current Source Feedback |
|
Use Scenario: Measuring CPU core rail current (up to 50A) using a 0.5mΩ shunt in a thin-profile laptop motherboard. IC Role / Device Role / Timing Role: Adjustable-gain current-sense amplifier driving ADC input with rail-to-rail output swing and minimal board leakage sensitivity. Use Value: 700µA supply current minimizes impact on standby power; small 10-pin µMAX footprint saves PCB area near high-current traces. |
Use Scenario: Closed-loop control of a 4–20mA industrial transmitter where sense resistor voltage must be measured with <0.1% error. IC Role / Device Role / Timing Role: Ultra-stable gain amplifier providing feedback signal to op-amp current regulator, rejecting supply ripple via 93–99dB PSRR. Use Value: ±0.5% gain accuracy and <25µV offset ensure compliance with IEC 61000-4-5 surge immunity requirements for loop-powered sensors. |
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 |
|---|---|---|---|
| MAX4080TASA+ | Fixed 20V/V gain, ±50µV max VOS, 2.7–76V common-mode, 1.5mA supply current | Limited to fixed-gain designs; higher offset reduces resolution below 10mA | Select when fixed 20× gain suffices and 76V common-mode is required beyond MAX9922EUB+T's 28V limit |
| INA240A1DGNR | Fixed 20V/V gain, ±20µV max VOS, 2.7–80V common-mode, 2.4mA supply current, integrated EMI filter | Higher quiescent current; no adjustable gain; optimized for motor-drive EMI environments | Choose for high-noise motor control where EMI robustness outweighs need for gain flexibility and ultra-low IQ |
Compared with MAX4080TASA+ and INA240A1DGNR, the MAX9922EUB+T uniquely combines user-adjustable gain, ±10µV offset, and 700µA supply current - making it optimal for portable, battery-sensitive, and calibration-free precision sensing where gain optimization is required per design.
Availability
MAX9922EUB+T is available at Aetrix Electronics and suitable for notebook/desktop power management, handheld Li+ battery current monitoring, and precision current source applications requiring stable component supply across extended temperature and long production lifecycles.
Supply support for MAX9922EUB+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 portable applications.
The MAX9922EUB+T belongs to Maxim's ultra-precision current-sense amplifier product line, engineered specifically for high-accuracy, high-common-mode, low-power battery and power-supply monitoring where offset stability and gain fidelity are non-negotiable.
FAQ
What is the maximum input common-mode voltage supported by the MAX9922EUB+T?
The MAX9922EUB+T supports an input common-mode voltage range of +1.9V to +28V, independent of its VDD supply voltage. This allows direct sensing on battery rails as low as 1.9V or industrial 24V buses without level-shifting. The RSB pin must be tied to either RS+ or RS− to enable full 28V operation, as specified in the Absolute Maximum Ratings table.
How is gain configured on the MAX9922EUB+T, and what is the recommended resistor tolerance?
Gain on the MAX9922EUB+T is set externally using two resistors (R₁ and R₂) forming a divider between OUT, FB, and REF, with AV = 1 + R₂/R₁. For best accuracy, use 0.1% tolerance metal-film resistors with low TCR (<50ppm/°C); the datasheet confirms ±0.5% total gain error is achievable with such components under −40°C to +85°C conditions.
Can the MAX9922EUB+T operate in bidirectional mode, and how is it configured?
Yes, the MAX9922EUB+T supports bidirectional current sensing. To configure bidirectional mode, connect the REF pin to VDD/2 (e.g., via resistor divider or buffered reference). This sets VOUT = VREF at zero current, allowing positive VSENSE (charge) to drive output toward VDD and negative VSENSE (discharge) to drive output toward GND - delivering true bipolar output swing.
What is the shutdown current of the MAX9922EUB+T, and how is shutdown activated?
The MAX9922EUB+T draws less than 1µA total supply current in shutdown mode. Shutdown is activated by driving the SHDN pin low (≤0.3V at VDD = 5.5V); normal operation resumes when SHDN is pulled high to VDD. Both VDD and RSB/RS+/RS− supply currents drop below 1µA each during shutdown, as verified in the Electrical Characteristics table.
Does the MAX9922EUB+T require external compensation, and what is the recommended noise-reduction capacitor value?
The MAX9922EUB+T is internally compensated and stable with capacitive loads up to 200pF. An optional ~1nF capacitor may be placed between OUT and FB to reduce broadband noise and suppress 20kHz autozero ripple - but values above 1nF reduce bandwidth (e.g., 10nF cuts −3dB point to ~1kHz at AV = 100), so selection must balance noise vs. signal fidelity.
MAX9922EUB+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:
- 0.1 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+T FAQ
1.How can I place an order for MAX9922EUB+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX9922EUB+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 MAX9922EUB+T reliable?
The price and inventory of MAX9922EUB+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX9922EUB+T is usually 5 days.
3.What payment methods are accepted for MAX9922EUB+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX9922EUB+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX9922EUB+T?
MAX9922EUB+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX9922EUB+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 MAX9922EUB+T?
For technical support, including MAX9922EUB+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX9922EUB+T requirements.
6.How does Aetrix verify that MAX9922EUB+T is sourced from the original manufacturer or authorized distributors?
All MAX9922EUB+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 MAX9922EUB+T meets industry standards.
7.What is the process for return or replacement of MAX9922EUB+T?
All MAX9922EUB+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX9922EUB+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 MAX9922EUB+T part is unused and in its original packaging.
Return procedure for MAX9922EUB+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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