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Analog Devices Inc./Maxim Integrated LM4050CIX3-2.5
- Part No.:
- LM4050CIX3-2.5
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- SC-70, SOT-323
- Datasheet:
-
LM4050CIX3-2.5.pdf
- Description:
- LM4050 50PPM PER DEGREE CELSIUS
- Quantity:
- Payment:
- Shipping:
Inventory:988
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Product details
Overview
LM4050CIX3-2.5 from Maxim Integrated is a precision 2.500V shunt voltage reference in SC70-3 package, featuring ±0.5% initial accuracy, ±15ppm/°C temperature coefficient over –40°C to +125°C, 60µA–15mA operating current range, and 35µVRMS wideband noise (10Hz–10kHz). It serves as a stable reference for ADC/DAC biasing, portable power monitoring, and battery management circuits.
For engineers reviewing the LM4050CIX3-2.5 datasheet, LM4050CIX3-2.5 pinout, LM4050CIX3-2.5 application, or LM4050CIX3-2.5 equivalent, key selection criteria include guaranteed shunt-current stability across industrial temperature extremes, no-output-capacitor operation with capacitive load tolerance, and ultra-small 1.8mm × 1.8mm footprint for space-constrained designs.
Technical Context
The LM4050CIX3-2.5 uses a laser-trimmed bandgap architecture to maintain precise reverse breakdown voltage under varying load and temperature conditions. Its internal pass transistor sinks current to regulate VSHUNT, eliminating need for external stabilization capacitors while remaining stable with any output capacitance.
It operates as a two-terminal shunt device with cathode (Pin 2) and anode (Pin 1), where Pin 3 is NC (must be left floating or tied to Pin 2). The device clamps to ~0.7V below ground under forward bias up to 10mA, and guarantees regulation across 60µA–15mA shunt current with dynamic impedance ≤0.9Ω at 1mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.500V ±13mV at +25°C (±0.5% grade); enables accurate 2.5V system reference for 12-bit+ data converters |
| Temp Coefficient | ±15ppm/°C max over –40°C to +125°C; ensures <±0.3125mV drift across full industrial range |
| Operating Current | 60µA to 15mA shunt range; supports micropower sensor nodes and high-current reference buffering |
| Dynamic Impedance | ≤0.9Ω at 1mA, 120Hz; maintains tight regulation despite rapid load transients |
| Output Noise | 35µVRMS (10Hz–10kHz); low enough for precision 16-bit SAR ADC reference without filtering |
| Long-Term Stability | 120ppm after 1000h; predictable aging behavior for mission-critical calibration systems |
Pinout & Package
LM4050CIX3-2.5 is housed in a 3-pin SC70 surface-mount package (1.8mm × 1.8mm × 0.9mm), 50% smaller than SOT23-3. Thermal resistance θJA = 460°C/W enables operation up to +125°C ambient with proper layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (+) | Anode / Reference Output Terminal | Connects to regulated 2.500V node; supplies current to load when used in shunt configuration |
| Pin 2 (–) | Cathode / Ground Reference Terminal | Sinks shunt current; must be connected to system ground or return path for regulation |
| Pin 3 (N.C.) | No Connection | Must remain unconnected or tied directly to Pin 2; floating connection avoids parasitic coupling |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SC70-3 footprint | 1.8mm × 1.8mm area saves >50% PCB space vs. SOT23-3, critical for wearables and IoT edge nodes |
| No output capacitor required | Stable with any capacitive load (0–∞), simplifying layout and eliminating capacitor BOM cost and aging concerns |
| Wide shunt-current range | 60µA minimum ensures regulation in µA-level sleep modes; 15mA max supports active-load buffering |
| Low 35µVRMS noise | Enables direct use in high-resolution analog signal chains without additional low-noise LDO or RC filtering |
| Guaranteed –40°C to +125°C operation | Validated performance across full automotive and industrial temperature range without derating |
Applications
| Battery-Powered Instrumentation | Industrial Process Control |
|---|---|
Use Scenario: Portable multimeter measuring 0–2.5V DC signals with 16-bit resolution. IC Role / Device Role / Timing Role: Provides stable 2.500V reference for SAR ADC input scaling and offset calibration. Use Value: ±0.5% initial accuracy and ±15ppm/°C TC ensure <±0.5 LSB error over temperature, meeting Class II meter specs. | Use Scenario: 4–20mA loop-powered transmitter conditioning sensor output. IC Role / Device Role / Timing Role: Supplies precise 2.500V bias to op-amp signal conditioning stage and DAC feedback path. Use Value: 60µA–15mA operating range accommodates variable loop current while maintaining regulation during brownout. |
| Notebook Computer Power Monitoring | Medical Sensor Front-End |
Use Scenario: Real-time battery voltage and rail health monitoring in ultrabook power management IC. IC Role / Device Role / Timing Role: References ADC channel measuring 3.3V/5V/12V rails and Li-ion cell voltage. Use Value: 35µVRMS noise prevents quantization dither in 12-bit monitoring ADC; SC70 size fits dense PMIC layout. | Use Scenario: ECG front-end amplifier requiring low-drift, low-noise reference for DC-coupled biopotential measurement. IC Role / Device Role / Timing Role: Sets common-mode voltage and ADC reference for 24-bit delta-sigma converter. Use Value: Guaranteed long-term stability (120ppm/1000h) ensures calibration validity between patient sessions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431ACDBVR | Adjustable 1.24V–18V output; 0.5% initial accuracy; 100ppm/°C TC; SOT23-3 package | Requires external resistor divider; higher TC reduces accuracy over temperature vs. fixed 2.5V output | Select when programmability or higher voltage (>5V) is needed; not drop-in for fixed 2.5V SC70 layout |
| REF3025AIDBZR | 2.500V series reference; 0.2% initial accuracy; 50ppm/°C TC; SC70-3; 50µA quiescent current | Series topology requires minimum load current; higher supply headroom needed vs. shunt's low-voltage flexibility | Choose for lower noise (25µVRMS) and tighter initial accuracy; requires redesign for series biasing and dropout margin |
Compared with TLVH431ACDBVR and REF3025AIDBZR, LM4050CIX3-2.5 offers fixed 2.5V output with lowest thermal drift (±15ppm/°C), smallest footprint, and true zero-headroom shunt operation-ideal for battery-fed, space-limited systems where simplicity and temperature stability are prioritized over adjustability or ultra-low noise.
Availability
LM4050CIX3-2.5 is available at Aetrix Electronics and suitable for portable instrumentation, industrial process control, notebook power monitoring, and medical sensor front-end designs requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM4050CIX3-2.5 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 and mixed-signal ICs for industrial, automotive, and communications applications, with emphasis on high-reliability, low-power, and miniaturized solutions.
The LM4050/LM4051 product line delivers micropower shunt voltage references optimized for space-constrained, battery-operated, and wide-temperature industrial systems-prioritizing accuracy, stability, and ease of integration over programmability.
FAQ
What is the guaranteed operating temperature range for LM4050CIX3-2.5?
The LM4050CIX3-2.5 is fully specified and production-tested over –40°C to +125°C. All electrical parameters-including output voltage, temperature coefficient, and dynamic impedance-are guaranteed across this full industrial temperature range per Maxim's datasheet revision 3. This makes LM4050CIX3-2.5 suitable for under-hood automotive modules and factory-floor controllers where ambient extremes occur.
Does LM4050CIX3-2.5 require an external output capacitor for stability?
No, LM4050CIX3-2.5 does not require an external output capacitor and remains stable with any capacitive load-from 0pF to several µF. This eliminates capacitor-related BOM cost, board area, aging effects, and ESD sensitivity. The internal bandgap design inherently provides phase margin sufficient for unconditional stability, as verified in typical operating characteristics plots (Figure 1 and toc14/toc15).
What is the minimum shunt current needed for regulation in LM4050CIX3-2.5?
The LM4050CIX3-2.5 requires a minimum shunt current (IRMIN) of 65µA to maintain regulation at +25°C, with 45µA guaranteed down to –40°C. Designers must ensure that the source resistor (RS) and supply voltage (VS) combination always delivers ≥65µA to Pin 2 under worst-case conditions-especially during low-load or low-VS states-to prevent loss of reference accuracy.
How does the noise performance of LM4050CIX3-2.5 compare to other 2.5V references?
LM4050CIX3-2.5 delivers 35µVRMS wideband noise (10Hz–10kHz), measured at 100µA operating current. This is lower than standard zener-based shunt references (e.g., LM385: ~60µVRMS) and competitive with mid-tier series references. While REF3025AIDBZR offers slightly lower noise (25µVRMS), LM4050CIX3-2.5 achieves its noise level in a shunt topology with zero headroom requirement-making it uniquely suited for low-voltage, high-precision applications where series references cannot operate.
Can Pin 3 of LM4050CIX3-2.5 be left unconnected or must it be grounded?
Pin 3 of LM4050CIX3-2.5 is designated N.C. (No Connection) and must either be left floating or connected directly to Pin 2 (cathode). Connecting Pin 3 to any other node-including system ground unrelated to Pin 2-may introduce leakage paths or parasitic coupling that degrades regulation accuracy and long-term stability. The datasheet explicitly prohibits routing Pin 3 to independent traces or vias.
LM4050CIX3-2.5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- SC-70, SOT-323
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Reference Type:
- Shunt
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 15 mA
- Tolerance:
- ±0.5%
- Temperature Coefficient:
- 50ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 35µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 65 µA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-3
LM4050CIX3-2.5 FAQ
1.How can I place an order for LM4050CIX3-2.5 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4050CIX3-2.5 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 LM4050CIX3-2.5 reliable?
The price and inventory of LM4050CIX3-2.5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4050CIX3-2.5 is usually 5 days.
3.What payment methods are accepted for LM4050CIX3-2.5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4050CIX3-2.5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4050CIX3-2.5?
LM4050CIX3-2.5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4050CIX3-2.5 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 LM4050CIX3-2.5?
For technical support, including LM4050CIX3-2.5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4050CIX3-2.5 requirements.
6.How does Aetrix verify that LM4050CIX3-2.5 is sourced from the original manufacturer or authorized distributors?
All LM4050CIX3-2.5 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 LM4050CIX3-2.5 meets industry standards.
7.What is the process for return or replacement of LM4050CIX3-2.5?
All LM4050CIX3-2.5 units undergo pre-shipment inspection (PSI). If there is an issue with LM4050CIX3-2.5, 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 LM4050CIX3-2.5 part is unused and in its original packaging.
Return procedure for LM4050CIX3-2.5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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