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STMicroelectronics LM217MS-TR
- Part No.:
- LM217MS-TR
- Manufacturer:
- STMicroelectronics
- Package:
- TO-261-4, TO-261AA
- Datasheet:
-
LM217MS-TR.pdf
- Description:
- LINEAR IC'S
- Quantity:
- Payment:
- Shipping:
Inventory:2,474
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Product details
Overview
LM217MS-TR from STMicroelectronics is a monolithic adjustable positive voltage regulator in SOT223 package, delivering up to 500 mA output current with 1.2 V to 37 V programmable output range. It features 0.01% typical line regulation, 0.1% typical load regulation, and integrated thermal overload and short-circuit protection. It is used in industrial power supplies, battery chargers, and lab bench adapters where stable, user-adjustable DC voltage is required.
For engineers reviewing the LM217MS-TR datasheet, LM217MS-TR pinout, LM217MS-TR application, or LM217MS-TR equivalent, key selection considerations include its −40 °C to 125 °C operating junction temperature, 1.25 V internal reference voltage, 100 µA max adjustment pin current, and SOT223 thermal resistance (RthJA = 110 °C/W).
Technical Context
The LM217MS-TR operates as a floating three-terminal regulator: input, output, and adjust pins form a feedback loop where VOUT = 1.25 V × (1 + R2/R1) + IADJ×R2. Its internal bandgap reference and error amplifier maintain output stability across line, load, and temperature variations.
It implements safe-area compensation to prevent transistor saturation during transient overloads and includes thermal shutdown triggered at ~160 °C junction temperature. The device requires no external components for basic operation but benefits from optional input bypass (0.1 µF), output stabilization (1 µF tantalum), and adjustment-pin bypass (10 µF) for enhanced ripple rejection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage Range | 1.2 V to 37 V - set by two external resistors; enables single-part flexibility across multiple supply rails. |
| Max Output Current | 500 mA - sufficient for mid-power analog circuits, sensor interfaces, and small microcontroller systems. |
| Line Regulation | 0.01 %/V typ. - ensures ≤0.37 mV change per volt input variation at fixed load, critical for noisy input environments. |
| Load Regulation | 0.1 %/V typ. for VOUT ≥5 V - guarantees ≤5 mV deviation when load shifts from 10 mA to 500 mA. |
| Reference Voltage | 1.25 V ±0.05 V - precise internal bandgap reference enabling accurate output programming with standard resistor tolerances. |
| Adjust Pin Current | 50–100 µA - low and stable, minimizing error contribution in high-R divider designs. |
| Thermal Shutdown Threshold | ~160 °C - protects against sustained overloads or inadequate heatsinking without latch-up. |
Pinout & Package
SOT223 package: surface-mount, 4-pin (3 active + tab), thermally enhanced with exposed drain pad connected to output terminal. Dimensions: 6.5 mm × 3.5 mm × 1.8 mm (L×W×H); recommended footprint per DS0522 Rev 13 Figure 19 and Table 11.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (INPUT) | Unregulated DC input | Accepts 2.5 V to 40 V differential above output; must be decoupled locally if >10 cm from bulk capacitor. |
| Pin 2 (OUTPUT) | Regulated output node | Provides final DC voltage; also connects to exposed thermal pad for heat dissipation and electrical reference. |
| Pin 3 (ADJUST) | Feedback reference point | Senses 1.25 V reference; connects to resistor divider midpoint; bypassing to ground improves AC rejection. |
| Pin 4 (TAB / OUTPUT) | Thermal and electrical output connection | Internally tied to output pin; must be soldered to large copper pour for RthJA ≤110 °C/W performance. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable output via 2-resistor network | Eliminates need for multiple fixed-voltage regulators; reduces BOM count and inventory complexity. |
| Floating operation capability | Supports high-side or series-pass configurations (e.g., 100 V input → 24 V output) as long as VI−VO ≤ 40 V. |
| Internal safe-area compensation | Prevents secondary breakdown during current limiting, enabling robust operation under short-circuit transients. |
| Low quiescent current return path | Directs bias current back to output, ensuring minimum load condition (~3.5 mA) is met without external sink. |
| Stable without output capacitance | Permits use in capacitance-sensitive applications (e.g., low-noise LDO replacements) while remaining immune to ESR-induced oscillation. |
Applications
| Industrial Power Supply | Battery Charger Control |
|---|---|
Use Scenario: DIN-rail mounted 24 V system powering PLC I/O modules and field sensors. IC Role / Device Role / Timing Role: Primary adjustable DC-DC post-regulator providing clean, stable 15 V and 5 V rails from unregulated 28 V bus. Use Value: 0.1% load regulation ensures consistent sensor excitation voltage despite varying module count and cable length. |
Use Scenario: 12 V lead-acid battery charger with programmable constant-voltage float stage. IC Role / Device Role / Timing Role: Precision voltage reference and control element in feedback loop of switching charger controller. Use Value: 1.25 V reference tolerance (±4%) enables ±0.5% CV accuracy-meeting IEC 62133 battery safety requirements. |
| Lab Bench Power Adapter | Programmable Current Source |
Use Scenario: Desktop adjustable bench supply with front-panel potentiometer and digital voltmeter. IC Role / Device Role / Timing Role: Core linear regulator delivering user-tuned output; paired with series pass transistor for higher current. Use Value: 0.01% line regulation minimizes output drift during AC mains fluctuations, improving measurement repeatability. |
Use Scenario: LED driver for calibration light sources requiring <1% current stability. IC Role / Device Role / Timing Role: Constant-current regulator configured with fixed resistor between ADJ and OUTPUT pins. Use Value: 100 µA max IADJ contributes <0.1% error in 100 mA design-enabling traceable optical output calibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable voltage regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM317MS-TR | Same SOT223 package and pinout; wider operating junction temperature range (0 °C to 125 °C vs. −40 °C to 125 °C) and slightly looser load regulation (0.5% vs. 0.1% for VOUT ≥5 V). | Preferred for commercial-grade equipment not requiring extended cold-start capability. | Select LM317MS-TR only if ambient operating temperature stays above 0 °C and tighter load regulation is not required. |
| TLV1117-33CDR | Fixed 3.3 V LDO in SOT223; lower dropout (1.2 V), higher PSRR (70 dB), but non-adjustable and limited to 800 mA max. | Used in low-noise digital subsystems (e.g., MCU cores, ADC references) where fixed rail suffices. | Choose TLV1117-33CDR only when output voltage is fixed at 3.3 V and input-to-output differential is <6 V. |
Compared with LM317MS-TR, the LM217MS-TR offers superior low-temperature operation and tighter load regulation-critical for outdoor or automotive-adjacent industrial gear. Versus TLV1117-33CDR, it trades PSRR and dropout for full adjustability and higher input voltage tolerance, making it suitable for wide-input legacy power architectures.
Availability
LM217MS-TR is available at Aetrix Electronics and suitable for industrial power supplies, battery management systems, and programmable test equipment requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for LM217MS-TR 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.
The LM217M/LM317M series belongs to ST's legacy linear regulator product line, engineered specifically for robust, cost-effective, and design-simple adjustable DC power in harsh industrial environments.
FAQ
What is the minimum load current required for stable regulation?
The LM217MS-TR requires a minimum load current of 3.5 mA (typ.) to maintain regulation, due to internal quiescent current returning to the output pin. If load falls below this threshold-such as during standby-the output voltage may rise uncontrollably. A 1 kΩ resistor from output to ground satisfies this requirement for most 12 V+ applications.
Can the LM217MS-TR be used in a current-limiting configuration?
Yes-the LM217MS-TR can function as a precision current regulator by connecting a single resistor between the ADJUST and OUTPUT pins. With VREF = 1.25 V, output current equals 1.25 V / RSET. For example, a 1.25 Ω resistor delivers 1 A; layout must minimize trace resistance and thermal drift in RSET.
Does the SOT223 package require a heatsink for 500 mA operation?
At 500 mA and 10 V drop (5 W dissipation), the SOT223 package with RthJA = 110 °C/W will rise ~550 °C above ambient-far exceeding safe limits. A minimum 25 cm² copper pour (2 oz Cu) is mandatory; for continuous 500 mA at >5 V drop, an external heatsink or parallel devices are recommended.
How does the adjustment pin capacitor improve performance?
A 10 µF capacitor between ADJUST and ground improves ripple rejection by ~80 dB at 120 Hz, especially in high-gain configurations (e.g., 24 V output). It shunts AC error signal away from the reference node, preventing amplification of input ripple into output noise-critical for sensitive analog circuitry.
LM217MS-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- TO-261-4, TO-261AA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Adjustable
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 1.2V
- Voltage - Output (Max):
- 37V
- Voltage Dropout (Max):
- -
- Current - Output:
- 500mA
- Current - Quiescent (Iq):
- 5 mA
- Current - Supply (Max):
- -
- PSRR:
- 80dB ~ 65dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Temperature, Short Circuit
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-223
LM217MS-TR FAQ
1.How can I place an order for LM217MS-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM217MS-TR 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 LM217MS-TR reliable?
The price and inventory of LM217MS-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM217MS-TR is usually 5 days.
3.What payment methods are accepted for LM217MS-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM217MS-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM217MS-TR?
LM217MS-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM217MS-TR 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 LM217MS-TR?
For technical support, including LM217MS-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM217MS-TR requirements.
6.How does Aetrix verify that LM217MS-TR is sourced from the original manufacturer or authorized distributors?
All LM217MS-TR 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 LM217MS-TR meets industry standards.
7.What is the process for return or replacement of LM217MS-TR?
All LM217MS-TR units undergo pre-shipment inspection (PSI). If there is an issue with LM217MS-TR, 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 LM217MS-TR part is unused and in its original packaging.
Return procedure for LM217MS-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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