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Analog Devices Inc./Maxim Integrated MAX9923TEUB+T
- Part No.:
- MAX9923TEUB+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX9923TEUB+T.pdf
- Description:
- IC CURR SENSE 1 CIRCUIT 10UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:2,030
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Product details
Overview
MAX9923TEUB+T from Maxim Integrated is an ultra-precision, high-side current-sense amplifier with fixed 25V/V gain, ±25µV 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 supply. It enables accurate bidirectional or unidirectional battery current monitoring in space-constrained portable power systems.
For engineers reviewing the MAX9923TEUB+T datasheet, MAX9923TEUB+T pinout, MAX9923TEUB+T application, or MAX9923TEUB+T equivalent, this page delivers verified technical context, real-world design meaning for key specs, validated pin functions, confirmed alternatives, and supply support details specific to the MAX9923TEUB+T variant.
Technical Context
The MAX9923TEUB+T implements spread-spectrum autozeroing to maintain ≤25µV max VOS across -40°C to +85°C and eliminate 1/f noise and thermal drift. Its indirect current-feedback architecture converts VSENSE to a precision current, then compares it against a feedback current derived from VOUT/gain.
This architecture supports both unidirectional (REF = GND) and bidirectional (REF = VDD/2) operation, with rail-to-rail output swing and guaranteed linear operation up to ±150mV VSENSE. The internal laser-trimmed 25V/V gain resistor ensures 0.5% accuracy without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | Fixed 25V/V - eliminates need for external gain-setting resistors and associated layout sensitivity. |
| Input Offset Voltage (max) | ±25µV over -40°C to +85°C - enables accurate measurement of sub-10mV sense voltages (e.g., 100mΩ shunt at 100mA). |
| Gain Accuracy (max) | ±0.5% - reduces calibration burden in production test and ensures consistent current reporting across units. |
| Common-Mode Range | +1.9V to +28V, independent of VDD - allows direct sensing on Li+ battery packs (2.5–4.2V), 12V automotive rails, or 24V industrial buses without level-shifting. |
| Supply Current | 700µA typical - supports always-on current monitoring in low-power portable devices with minimal impact on battery life. |
| Shutdown Current | <1µA - enables deep sleep modes during system idle periods while preserving fast wake-up capability. |
| Bandwidth | 50kHz (-3dB) - sufficient for DC–5kHz current transients in battery charge/discharge control loops and power supply monitoring. |
Pinout & Package
MAX9923TEUB+T 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 | Current-sense amplifier input stage supply | Must be tied to either RS+ or RS− to bias the high-side input stage; determines common-mode headroom for sensing. |
| 2 - RS+ | Positive current-sense input | Connects to high-side of shunt resistor; accepts up to +28V common-mode voltage regardless of VDD. |
| 3 - RS− | Negative current-sense input | Connects to low-side of shunt; differential voltage (RS+ − RS−) is amplified with 25V/V gain. |
| 4 - N.C. | No connection | Not internally bonded; must remain floating - no routing or soldering allowed. |
| 5 - GND | Analog ground reference | Return path for REF, SHDN, and internal circuitry; requires low-impedance connection to system ground plane. |
| 6 - SHDN | Logic shutdown control | Active-low input: tie to GND for <1µA shutdown current; tie to VDD for normal operation. |
| 7 - REF | Bidirectional reference voltage input | Set to GND for unidirectional output (0V to VDD); set to VDD/2 for bidirectional output (±VDD/2 around REF). |
| 8 - FB | Feedback node for noise reduction | Internal 1kΩ resistor connects FB to REF; optional 1nF capacitor between FB and OUT reduces broadband noise and autozero ripple. |
| 9 - OUT | Voltage output | Delivers VOUT = 25 × (RS+ − RS−) + VREF; rail-to-rail capable with 25mV min swing to rails. |
| 10 - VDD | Power supply input | Operates from +2.85V to +5.5V; requires 0.1µF ceramic bypass capacitor directly to GND. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low offset voltage | ±25µV max over full temperature range - enables accurate detection of <100mA through 100mΩ shunts without calibration. |
| Laser-trimmed fixed gain | 25V/V with ±0.5% accuracy - removes gain error variation from external resistor tolerances and PCB layout parasitics. |
| Wide common-mode input range | +1.9V to +28V, independent of VDD - supports direct sensing on single-cell Li+ (≥1.9V) up to 24V industrial rails without auxiliary supplies. |
| Spread-spectrum autozeroing | Eliminates 1/f noise and drift - maintains stable offset performance over time and temperature without external chopper sync signals. |
| Low quiescent current | 700µA operating / <1µA shutdown - extends battery runtime in handheld devices during active monitoring and deep sleep. |
Applications
| Handheld Li+ Battery Monitoring | Notebook Power Management |
|---|---|
|
Use Scenario: Real-time tracking of charge/discharge current in smartphones and tablets using a 50mΩ shunt in the battery path. IC Role / Device Role / Timing Role: High-side current-sense amplifier converting mV-level shunt voltage into a precise, REF-referenced analog output for ADC sampling. Use Value: Enables accurate state-of-charge (SoC) estimation with ±1% current measurement error across 0.1A–3A range, even as battery voltage drops from 4.2V to 2.8V. |
Use Scenario: Monitoring CPU/GPU rail current in ultrabooks to trigger dynamic power throttling and thermal management. IC Role / Device Role / Timing Role: High-accuracy current sensor feeding analog input of system power controller or microcontroller ADC. Use Value: Supports fast-response current limiting (50kHz bandwidth) and precise power budgeting with 25µV offset enabling detection of 50mA load changes on 50mΩ shunts. |
| Precision Current Sources | Industrial 24V Power Monitoring |
|
Use Scenario: Closed-loop control of programmable lab power supplies requiring ±0.1% current regulation stability. IC Role / Device Role / Timing Role: Feedback element in op-amp-based current source topology, sensing shunt voltage and driving pass transistor gate. Use Value: 0.5% gain accuracy and 25µV offset ensure <0.2% total current error without per-unit trimming, reducing manufacturing cost and test time. |
Use Scenario: Monitoring motor drive or PLC I/O module current on 24V DC distribution bus with wide input voltage tolerance. IC Role / Device Role / Timing Role: High-side current monitor interfacing to isolated ADC or microcontroller via optocoupler or digital isolator. Use Value: 28V common-mode range allows direct connection to 24V bus without level-shifting; 700µA supply current minimizes added load on control rail. |
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 |
|---|---|---|---|
| MAX40056ATA+T | 20V/V fixed gain, ±50µV max VOS, 2.7V–5.5V supply, same 10-pin µMAX package | Lower gain and higher offset reduce resolution for low-current sensing; wider supply range supports 2.7V logic interfaces | Select when lower cost and 2.7V compatibility outweigh need for 25V/V gain and 25µV offset. |
| INA240A1DGNR | 20V/V gain, ±20µV max VOS, 2.7V–5.5V supply, 8-pin VSSOP package, enhanced EMI rejection | Smaller footprint but only 8 pins limits flexibility; superior RF immunity suits noisy motor-drive environments | Select for EMI-critical 24V industrial systems where 20V/V gain suffices and board space is constrained. |
Compared with MAX40056ATA+T and INA240A1DGNR, the MAX9923TEUB+T provides the highest gain (25V/V) and tightest offset (±25µV) in a 10-pin µMAX package, making it optimal for portable Li+ applications demanding maximum resolution from minimal shunt voltage.
Availability
MAX9923TEUB+T is available at Aetrix Electronics and suitable for handheld Li+ battery monitoring, notebook power management, and precision current-source feedback requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for MAX9923TEUB+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 MAX9922/MAX9923 family was engineered specifically for ultra-precision, high-side current sensing in battery-powered and high-common-mode systems, prioritizing offset stability, gain accuracy, and wide input voltage range over raw speed or integration.
FAQ
What is the exact gain setting and tolerance of MAX9923TEUB+T?
The MAX9923TEUB+T features a factory-laser-trimmed fixed gain of exactly 25V/V, with a maximum gain error of ±0.5% over the full -40°C to +85°C temperature range and supply voltage of +2.85V to +5.5V. This specification is guaranteed by production testing and does not require external resistors or calibration for standard applications.
Can MAX9923TEUB+T operate with a 1.9V battery input?
Yes, the MAX9923TEUB+T supports an input common-mode voltage range from +1.9V to +28V on its RS+ and RS− pins - fully independent of VDD. When used with a 1.9V Li+ cell, the device remains functional as long as VDD is within its 2.85V–5.5V range and RSB is properly tied to RS+ or RS− to bias the input stage.
How does the REF pin function in bidirectional vs. unidirectional mode for MAX9923TEUB+T?
For unidirectional operation, connect REF to GND so that VOUT = 25 × VSENSE (0V to positive output only). For bidirectional operation, connect REF to VDD/2 so that VOUT = 25 × VSENSE + VDD/2 - yielding positive output for charge current and negative relative to REF for discharge current, enabling true bipolar sensing.
What is the purpose of the FB pin on MAX9923TEUB+T, and is an external capacitor required?
The FB pin on MAX9923TEUB+T connects internally to REF through a 1kΩ laser-trimmed resistor and serves as the feedback node for optional noise reduction. A ~1nF capacitor between FB and OUT is optional but recommended in noisy environments to suppress broadband noise and 20kHz autozero ripple; larger values further reduce noise at the expense of bandwidth.
Does MAX9923TEUB+T support shutdown mode, and what is its current draw?
Yes, MAX9923TEUB+T includes a dedicated SHDN pin (Pin 6). Driving SHDN low places the device in shutdown mode, reducing total supply current to less than 1µA from both VDD and the RSB/RS+/RS− inputs. This enables ultra-low-power system sleep states while retaining fast wake-up capability upon SHDN high assertion.
MAX9923TEUB+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:
- 50 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
MAX9923TEUB+T FAQ
1.How can I place an order for MAX9923TEUB+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX9923TEUB+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 MAX9923TEUB+T reliable?
The price and inventory of MAX9923TEUB+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX9923TEUB+T is usually 5 days.
3.What payment methods are accepted for MAX9923TEUB+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX9923TEUB+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX9923TEUB+T?
MAX9923TEUB+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX9923TEUB+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 MAX9923TEUB+T?
For technical support, including MAX9923TEUB+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX9923TEUB+T requirements.
6.How does Aetrix verify that MAX9923TEUB+T is sourced from the original manufacturer or authorized distributors?
All MAX9923TEUB+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 MAX9923TEUB+T meets industry standards.
7.What is the process for return or replacement of MAX9923TEUB+T?
All MAX9923TEUB+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX9923TEUB+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 MAX9923TEUB+T part is unused and in its original packaging.
Return procedure for MAX9923TEUB+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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