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STMicroelectronics LM217MDT-TR
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- Part No.:
- LM217MDT-TR
- Manufacturer:
- STMicroelectronics
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
LM217MDT-TR.pdf
- Description:
- IC REG LINEAR POS ADJ 500MA DPAK
- Quantity:
- Payment:
- Shipping:
Inventory:16,919
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Product details
Overview
LM217MDT-TR from STMicroelectronics is a monolithic adjustable positive voltage regulator in DPAK (TO-252) package, delivering up to 500 mA output current with 1.2–37 V adjustable output range, ±0.7% output voltage temperature stability, and integrated thermal overload and short-circuit protection. It serves as a floating regulator in industrial power supplies, battery chargers, and lab bench supplies where input-to-output differential voltage up to 40 V must be sustained.
For engineers reviewing the LM217MDT-TR datasheet, LM217MDT-TR pinout, LM217MDT-TR application, or LM217MDT-TR equivalent, key selection criteria include guaranteed operation from –40 °C to +125 °C junction temperature, 0.01% typical line regulation, 0.1% typical load regulation, and compatibility with simple two-resistor feedback networks for precise output setting.
Technical Context
The LM217MDT-TR implements a bandgap-referenced error amplifier with internal 1.25 V reference voltage between OUTPUT and ADJUST terminals, enabling output voltage calculation via VO = 1.25 V × (1 + R₂/R₁) + IADJR₂. Its floating architecture allows high-side regulation without ground-referenced constraints.
It features internal safe-area compensation for output transistor transition, fixed 10 µA typical adjustment pin current (max 100 µA), and supply voltage rejection of 65–80 dB at 120 Hz depending on CADJ configuration. Thermal shutdown activates at ~165 °C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output voltage range | 1.2 V to 37 V - set by external resistor divider; enables single-part support across wide system rail requirements |
| Max output current | 500 mA - sufficient for mid-power analog circuits, sensor signal chains, and embedded microcontroller supplies |
| Line regulation | 0.01% typical - ensures <±0.37 mV change per volt input variation at 25 °C, critical for stable biasing under line fluctuations |
| Load regulation | 0.1% typical for VO ≥ 5 V - guarantees ≤5 mV deviation over full 10–500 mA load range, supporting dynamic load applications |
| Reference voltage | 1.25 V ±0.05 V - tightly controlled internal bandgap reference enabling accurate output programming |
| Junction temp range | –40 °C to +125 °C - validated for industrial and automotive under-hood ambient conditions with derating |
| Input-output differential | 40 V max - supports high-voltage input sources such as rectified 28 VAC or 36 VDC bus rails |
Pinout & Package
DPAK (TO-252) package with exposed thermal pad (pin 2 connected to output); thermally optimized for PCB copper area mounting; footprint per DS0522 Rev 13 Table 9 (A = 6.70 mm, B = 6.70 mm, C = 1.80 mm).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (INPUT) | Unregulated input supply connection | Accepts 2.5 V to 40 V above output; requires local bypass capacitor for stability and ripple suppression |
| Pin 2 (OUTPUT) | Regulated output and thermal pad connection | Primary regulated output node; exposed pad must be soldered to large copper pour for thermal dissipation (RthJA = 100 °C/W) |
| Pin 3 (ADJUST) | Feedback reference node | Senses 1.25 V reference to output; connects to resistor divider; bypassing with 10 µF improves ripple rejection by ~80 dB |
Key Features
| Feature | Design Value |
|---|---|
| Floating operation capability | Enables high-side regulation and programmable current source configurations without ground-referenced limitations |
| Internal safe-area compensation | Prevents secondary breakdown during output transistor transitions, improving reliability under capacitive or inductive loads |
| Thermal overload protection | Automatic shutdown at ~165 °C junction temperature with hysteresis; resumes operation after cooldown |
| Short-circuit protection | Current-limiting circuitry restricts output to ~600 mA during fault, preventing device destruction |
| Low adjustment pin current | 100 µA max ensures minimal error contribution (<0.1% at R₂ = 10 kΩ), simplifying precision resistor selection |
Applications
| Industrial Power Supply | Battery Charger Control |
|---|---|
Use Scenario: Regulating unregulated 24 VDC bus to 15 V for PLC I/O modules with variable load profiles. IC Role / Device Role / Timing Role: Adjustable linear regulator providing stable, low-noise 15 V rail with thermal foldback during extended overloads. Use Value: Eliminates need for multiple fixed regulators; maintains ±1% output accuracy across –25 °C to +70 °C ambient with no external compensation. |
Use Scenario: Constant-current/constant-voltage stage in 12 V sealed lead-acid battery charger with thermal derating. IC Role / Device Role / Timing Role: Precision current regulator (via ADJUST-to-OUTPUT resistor) and voltage clamp during absorption phase. Use Value: Achieves <±3% charge current accuracy using single 1% resistor; thermal shutdown prevents cell damage during high-temp charging. |
| Lab Bench Power Supply | Embedded System Bias Rail |
Use Scenario: User-adjustable 1.2–30 V output in portable bench supply with digital voltage readback. IC Role / Device Role / Timing Role: Core voltage-setting element in analog control loop; ADJUST pin interfaced to DAC for programmability. Use Value: Enables 0.1 V resolution over full range using 10-turn potentiometer; 0.003% output noise ensures clean analog test signals. |
Use Scenario: Generating 3.3 V bias for RF transceiver and MCU in IoT edge node powered from 12 V vehicle battery. IC Role / Device Role / Timing Role: Local post-regulator rejecting ripple from upstream DC/DC converter; operates in floating configuration to isolate ground loops. Use Value: Delivers 350 mA at 3.3 V with 65 dB SVR at 120 Hz, reducing conducted EMI into sensitive RF sections. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM317MDT-TR | Same DPAK package and pinout; wider operating junction temperature range (0 °C to +125 °C vs. –40 °C to +125 °C); slightly looser load regulation (0.5% typ. vs. 0.1% typ.) | Not suitable for cold-environment industrial deployments below 0 °C; acceptable for commercial-grade equipment | Select when ambient operating temperature stays above 0 °C and cost sensitivity outweighs extended temp qualification |
| TLV1117-33CKC | Fixed 3.3 V output; SOT-223 package; lower dropout (1.2 V), higher PSRR (70 dB), but non-adjustable and limited to 800 mA max | Only usable where fixed 3.3 V is acceptable; cannot replace LM217MDT-TR in variable-output or >3.3 V designs | Choose only for dedicated 3.3 V LDO applications requiring better noise performance and smaller footprint |
Compared with LM317MDT-TR, the LM217MDT-TR offers superior low-temperature operation and tighter regulation-critical for field-deployed instrumentation-while TLV1117-33CKC trades adjustability for lower noise and higher PSRR in fixed-rail systems.
Availability
LM217MDT-TR is available at Aetrix Electronics and suitable for industrial power supplies, battery management systems, laboratory equipment, and embedded bias rails requiring stable component supply with full industrial temperature qualification.
Supply support for LM217MDT-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 silicon solutions for automotive, industrial, and power management applications.
The LM217M series belongs to ST's precision analog voltage regulator product line, engineered for robustness in harsh environments and ease of use in both fixed and programmable power architectures.
FAQ
What is the minimum load current required for stable regulation?
The LM217MDT-TR requires a minimum load current of 3.5 mA (typical) to maintain regulation, due to internal quiescent current returning to the output terminal. Below this threshold, output voltage may rise uncontrollably. A 360 Ω resistor from OUTPUT to ADJUST provides exactly 3.5 mA at 1.25 V reference, satisfying this requirement in no-load conditions.
Can the LM217MDT-TR be used as a current regulator?
Yes-the LM217MDT-TR can function as a precision current regulator by connecting a single resistor between OUTPUT and ADJUST terminals. With IADJ ≤ 100 µA and VREF = 1.25 V, output current equals 1.25 V / RSET, enabling accuracies better than ±3% using standard 1% resistors and proper thermal layout.
What thermal considerations apply when mounting the DPAK package?
The DPAK package has RthJA = 100 °C/W in standard JEDEC layout; thermal performance improves significantly with ≥4 cm² copper pour connected to Pin 2 (OUTPUT/thermal pad). For 500 mA at 10 V dropout (5 W dissipation), junction temperature rise exceeds 500 °C without heatsinking-thus forced-air cooling or external heatsink is mandatory above 1.5 W continuous dissipation.
Is an input bypass capacitor required?
An input bypass capacitor is recommended when the LM217MDT-TR is located >10 cm from the main filter capacitor. A 0.1 µF ceramic or 1 µF tantalum capacitor placed directly at the INPUT pin reduces sensitivity to input line impedance and suppresses high-frequency noise coupling, especially in switching supply front-ends.
LM217MDT-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- 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):
- -
- Current - Supply (Max):
- -
- PSRR:
- 80dB ~ 65dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Temperature, Short Circuit
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DPAK
LM217MDT-TR FAQ
1.How can I place an order for LM217MDT-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM217MDT-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 LM217MDT-TR reliable?
The price and inventory of LM217MDT-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM217MDT-TR is usually 5 days.
3.What payment methods are accepted for LM217MDT-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM217MDT-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM217MDT-TR?
LM217MDT-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM217MDT-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 LM217MDT-TR?
For technical support, including LM217MDT-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM217MDT-TR requirements.
6.How does Aetrix verify that LM217MDT-TR is sourced from the original manufacturer or authorized distributors?
All LM217MDT-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 LM217MDT-TR meets industry standards.
7.What is the process for return or replacement of LM217MDT-TR?
All LM217MDT-TR units undergo pre-shipment inspection (PSI). If there is an issue with LM217MDT-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 LM217MDT-TR part is unused and in its original packaging.
Return procedure for LM217MDT-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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