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STMicroelectronics LM217T-DG
- Part No.:
- LM217T-DG
- Manufacturer:
- STMicroelectronics
- Package:
- TO-220-3
- Datasheet:
-
LM217T-DG.pdf
- Description:
- IC REG LIN POS ADJ 1.5A TO220AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,638
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Product details
Overview
LM217T-DG from STMicroelectronics is a monolithic adjustable positive voltage regulator in TO-220 (dual-gauge) package, delivering over 1.5 A output current with 1.2 V to 37 V adjustable output range, 0.1% line and load regulation, and integrated thermal shutdown, current limiting, and safe operating area (SOA) control. It serves as a floating regulator in power supply rails for industrial instrumentation, lab bench supplies, and programmable DC sources.
For engineers reviewing the LM217T-DG datasheet, LM217T-DG pinout, LM217T-DG application, or LM217T-DG equivalent, key selection considerations include its −25°C to +150°C junction temperature rating, 1.25 V internal reference voltage, 100 µA max adjustment pin current, and compatibility with standard 3-pin heatsink-mounting layouts.
Technical Context
The LM217T-DG implements a bandgap-referenced feedback loop with an internal 1.25 V reference between output and adjust pins, enabling precise voltage setting via external resistor dividers. Its floating architecture allows operation with high input-to-ground potentials, provided the input-output differential remains ≤40 V.
It features SOA protection that dynamically limits power dissipation under high VI–VO conditions, plus thermal shutdown triggered at TJ ≥150°C. The device returns all quiescent current to the output pin, requiring ≥3.5 mA minimum load current to maintain regulation stability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output voltage range | 1.2 V to 37 V - set by external R1/R2 divider; enables single BOM part to replace multiple fixed-output regulators. |
| Output current | ≥1.5 A - sustained under VI–VO ≤15 V and PD < 20 W; supports medium-power analog and digital subsystems. |
| Line regulation | 0.01–0.02 %/V - ensures ≤0.2 mV change per volt input variation at 25°C; critical for stable biasing in precision circuits. |
| Load regulation | 5–15 mV (VO ≤5 V) or 0.1–0.3 % (VO ≥5 V) - maintains tight output accuracy across full load range without trimming. |
| Reference voltage | 1.25 V (typ.) - stable, temperature-compensated bandgap reference used directly in VO = 1.25(1 + R2/R1) + IADJ·R2 calculation. |
| Adjust pin current | 50–100 µA - low and stable; minimizes error term IADJ·R2 in output voltage equation, simplifying design. |
| Thermal shutdown threshold | 150°C - protects against sustained overload or inadequate heatsinking; auto-resumes after cooldown. |
Pinout & Package
LM217T-DG uses the TO-220 (dual-gauge) package - a through-hole, heatsink-mountable 3-pin outline with reinforced leadframe for enhanced thermal and mechanical robustness. Pin 1 is Adjust, Pin 2 is Output, Pin 3 is Input (viewed from front, leads down).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Adjust) | Feedback reference node | Connects to voltage divider midpoint; senses 1.25 V below output; determines regulation setpoint and enables current-source mode. |
| Pin 2 (Output) | Regulated power output | Delivers stabilized voltage/current; returns all quiescent current - requires ≥3.5 mA minimum load to prevent overvoltage. |
| Pin 3 (Input) | Unregulated DC input | Accepts 2.5 V to 40 V above output; must maintain ≥3 V dropout for regulation; connects to bulk capacitor and protection diodes. |
Key Features
| Feature | Design Value |
|---|---|
| Floating operation capability | Supports high-side regulation up to 40 V input-output differential - enables HV bias supplies without level-shifting circuitry. |
| SOA protection | Real-time power-limiting logic prevents destructive second breakdown during transient overloads or high VI–VO conditions. |
| Low IADJ drift | ΔIADJ ≤ 5 µA over VI–VO = 2.5–40 V and IO = 10 mA–1.5 A - ensures predictable output voltage error across operating conditions. |
| High SVR | 65–80 dB supply rejection at 120 Hz - suppresses ripple from unregulated AC/DC stages without additional filtering. |
| Remote sensing ready | Ground terminal of R2 placed near load ground - enables accurate regulation at point-of-load, compensating for PCB trace IR drop. |
Applications
| Industrial Power Supply | Programmable Lab Bench Supply |
|---|---|
|
Use Scenario: Fixed or variable DC rail for PLC I/O modules, sensor signal conditioning, and actuator drivers in factory automation cabinets. IC Role / Device Role / Timing Role: Primary adjustable voltage regulator providing stable 3.3 V, 5 V, 12 V, or 24 V outputs from wide-range SMPS or linear pre-regulators. Use Value: Eliminates need for multiple fixed regulators; 0.1% regulation ensures consistent ADC reference and op-amp bias across temperature and line variations. |
Use Scenario: User-adjustable output stage in benchtop power supplies where voltage and current limits are manually or digitally set. IC Role / Device Role / Timing Role: Core regulation element in series-pass topology, paired with potentiometer-based R1/R2 and current-sense resistor for CC/CV modes. Use Value: 1.5 A continuous output and thermal shutdown enable safe, repeatable testing of prototype boards without external foldback circuitry. |
| Battery Charger Controller | Precision Current Source |
|
Use Scenario: Constant-voltage/constant-current stage for sealed lead-acid or LiFePO₄ battery charging in UPS and portable medical devices. IC Role / Device Role / Timing Role: Adjustable CV regulator with external current-limit resistor (RS) and optional thermal derating based on ambient sensing. Use Value: Programmable output (12 V nominal) and built-in SOA control prevent overcharge during high-temperature operation or cell imbalance. |
Use Scenario: LED driver or transducer excitation source requiring stable current independent of load voltage swing (e.g., 4–20 mA loops). IC Role / Device Role / Timing Role: Precision current regulator configured with R1 between adjust and output pins; IO = 1.25 V / R1 + IADJ. Use Value: 100 µA max IADJ and <1% tempco on VREF yield ≤1.5% total current error from −25°C to +125°C without calibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable positive voltage regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM317T-DG | Same pinout and electrical specs, but rated for 0°C to +125°C junction temperature (vs. LM217T-DG's −25°C to +150°C). | Not suitable for extended cold-start or high-ambient industrial environments requiring −25°C operation. | Select LM217T-DG when operation below 0°C or above 125°C is required; otherwise LM317T-DG offers identical performance at lower cost. |
| LM317BT | Enhanced grade with tighter VREF tolerance (1.235–1.265 V vs. 1.2–1.3 V) and improved load regulation (≤25 mV), in TO-220 single-gauge package. | Lacks dual-gauge mechanical reinforcement; lower thermal resistance (RthJC = 5°C/W vs. 5°C/W same, but RthJA = 50°C/W vs. 60°C/W) favors compact heatsinks. | Choose LM317BT for metrology-grade supplies needing ±1% output accuracy; LM217T-DG preferred for ruggedized, high-reliability mounting. |
Compared with LM317T-DG and LM317BT, the LM217T-DG uniquely supports −25°C startup and delivers identical regulation performance in a mechanically reinforced TO-220 package-making it optimal for industrial edge nodes and equipment exposed to wide ambient swings.
Availability
LM217T-DG is available at Aetrix Electronics and suitable for industrial power supplies, programmable bench supplies, battery charger controllers, and precision current sources requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM217T-DG 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, power, MCU, and sensor solutions for automotive, industrial, and consumer markets.
The LM217 series belongs to ST's legacy linear regulator product line, engineered specifically for high-reliability, wide-temperature industrial power conversion where robustness, simplicity, and long-term availability are prioritized over ultra-low quiescent current.
FAQ
What is the minimum load current required for stable regulation with LM217T-DG?
The LM217T-DG requires a minimum load current of 3.5 mA (typical) to 5 mA (max) when VI–VO = 40 V. This is due to its topology returning all quiescent current to the output pin; insufficient load causes output voltage to rise uncontrollably. A 330 Ω resistor from output to ground satisfies this requirement for most 5–12 V applications.
Can LM217T-DG be used in parallel for higher current output?
No - LM217T-DG is not designed for direct parallel operation. Its output voltage tolerance and load regulation characteristics cause current imbalance, risking thermal runaway. For >1.5 A, use a single higher-current regulator (e.g., ST's L200) or implement active current-sharing with external op-amps and sense resistors.
Does LM217T-DG require input and output capacitors for stability?
Yes - a 0.1 µF ceramic input capacitor is recommended to suppress high-frequency noise and prevent oscillation. An output capacitor (1 µF tantalum or 25 µF aluminum electrolytic) improves transient response. A 10 µF capacitor from adjust to ground enhances ripple rejection by ~15 dB but is optional for basic regulation.
How does the TO-220 dual-gauge package differ from standard TO-220 in LM217T-DG?
The dual-gauge TO-220 package features thicker leadframe material and reinforced internal bonding, improving mechanical durability and thermal cycling reliability. It maintains identical pinout and thermal resistance (RthJC = 5°C/W) but is specified for high-vibration environments like transportation and heavy machinery - unlike standard single-gauge TO-220 variants.
LM217T-DG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- TO-220-3
- Packaging:
- Tube
- 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:
- 1.5A
- Current - Quiescent (Iq):
- -
- Current - Supply (Max):
- -
- PSRR:
- 80dB ~ 65dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- -25°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220
LM217T-DG FAQ
1.How can I place an order for LM217T-DG through Aetrix?
Please submit a Request for Quotation (RFQ) for LM217T-DG 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 LM217T-DG reliable?
The price and inventory of LM217T-DG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM217T-DG is usually 5 days.
3.What payment methods are accepted for LM217T-DG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM217T-DG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM217T-DG?
LM217T-DG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM217T-DG 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 LM217T-DG?
For technical support, including LM217T-DG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM217T-DG requirements.
6.How does Aetrix verify that LM217T-DG is sourced from the original manufacturer or authorized distributors?
All LM217T-DG 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 LM217T-DG meets industry standards.
7.What is the process for return or replacement of LM217T-DG?
All LM217T-DG units undergo pre-shipment inspection (PSI). If there is an issue with LM217T-DG, 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 LM217T-DG part is unused and in its original packaging.
Return procedure for LM217T-DG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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