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STMicroelectronics LM217D2T-TR
- Part No.:
- LM217D2T-TR
- Manufacturer:
- STMicroelectronics
- Package:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Datasheet:
-
LM217D2T-TR.pdf
- Description:
- IC REG LINEAR POS ADJ 1.5A D2PAK
- Quantity:
- Payment:
- Shipping:
Inventory:6,578
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Product details
Overview
LM217D2T-TR from STMicroelectronics is a monolithic adjustable positive voltage regulator in D²PAK (SMD 2L STD-ST) 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 SOA protection - used in industrial power supplies, programmable lab bench supplies, and high-voltage floating regulator designs.
For engineers reviewing the LM217D2T-TR datasheet, LM217D2T-TR pinout, LM217D2T-TR application, or LM217D2T-TR equivalent, key selection criteria include input-output differential voltage tolerance (40 V max), reference voltage accuracy (1.25 V ±2%), junction temperature range (−25°C to +150°C), and thermal resistance (RthJA = 62.5°C/W, RthJC = 3°C/W).
Technical Context
The LM217D2T-TR operates as a floating linear regulator, sensing only the differential voltage between input and output pins - enabling high-side or high-voltage floating configurations where output may exceed ground-referenced input by up to 40 V. Its internal 1.25 V bandgap reference sets output via external resistor divider (VO = 1.25 V × (1 + R2/R1) + IADJR2), with IADJ tightly controlled at ≤100 µA.
It implements three-tier protection: foldback current limiting (adjustable via external sense resistor), thermal shutdown triggered at ~165°C junction temperature, and Safe Operating Area (SOA) control that dynamically reduces current under high VIN–VOUT conditions - ensuring robustness without external circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output voltage range | 1.2 V to 37 V - set by external resistive divider; enables single BOM for multiple output rails. |
| Output current | ≥1.5 A continuous - supports high-current analog/industrial loads without external pass transistors. |
| Reference voltage | 1.25 V (typ), ±2% - stable bandgap reference enabling <±1% output accuracy with precision resistors. |
| Line regulation | 0.02 %/V (typ) - minimal output drift over input voltage changes (3–40 V differential). |
| Load regulation | 15 mV (VO ≤5 V) / 0.3% (VO ≥5 V) - tight output stability across full load range (10 mA–1.5 A). |
| Input-output differential max | 40 V - defines maximum allowable voltage drop across device; critical for high-voltage applications. |
| Junction temperature range | −25°C to +150°C - rated for extended industrial environments; thermal shutdown activates near 165°C. |
Pinout & Package
D²PAK (SMD 2L STD-ST) package: surface-mount, 3-terminal, thermally enhanced plastic case with exposed drain pad (pin 2) for low RthJC = 3°C/W; compatible with standard reflow profiles per JEDEC J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (INPUT) | Unregulated DC input | Accepts 2.5 V to 40 V above output; requires local 0.1 µF bypass capacitor for stability. |
| Pin 2 (OUTPUT) | Regulated output node | Delivers adjustable voltage/current; connects to load and feedback divider; also serves as thermal path to PCB copper. |
| Pin 3 (ADJUST) | Reference feedback input | Senses 1.25 V reference; ties to resistor divider midpoint; 10 µF capacitor here improves ripple rejection by 15 dB. |
Key Features
| Feature | Design Value |
|---|---|
| Floating operation capability | Supports output voltages >100 V above ground when referenced to floating output - ideal for high-side biasing and isolated supplies. |
| Low adjustment pin current | IADJ ≤100 µA with ±5 µA variation - minimizes error term in VO = 1.25 V(1+R2/R1) + IADJR2, enabling high-R divider networks. |
| Integrated SOA protection | Automatically reduces output current under high VIN–VOUT and high temperature - prevents second breakdown without external components. |
| Thermal resistance | RthJC = 3°C/W (junction-to-case) - enables >2 W dissipation with modest heatsinking on PCB copper pour. |
| Supply voltage rejection | 66 dB (with 10 µF CADJ) at 120 Hz - suppresses AC line ripple and switching noise in mixed-signal systems. |
Applications
| Industrial Power Supply | Programmable Lab Bench Supply |
|---|---|
Use Scenario: Fixed or variable 3.3 V/5 V/12 V/24 V rails powering PLC I/O modules, sensor signal conditioners, and motor drivers in factory automation cabinets. IC Role / Device Role / Timing Role: Primary adjustable linear regulator providing clean, low-noise DC power; replaces fixed LDOs and reduces BOM count. Use Value: 0.1% regulation and 1.5 A output sustain stable operation under varying load transients and ambient temperatures up to 70°C. |
Use Scenario: User-adjustable output (1.2–30 V, 0–1.5 A) in benchtop power supplies with digital voltage/current readback and CV/CC mode switching. IC Role / Device Role / Timing Role: Core voltage-setting element in analog control loop; configured with potentiometer and op-amp feedback for precise setpoint tracking. Use Value: Floating architecture allows series-connected outputs for dual-polarity supplies; SOA protection prevents damage during short-circuit testing. |
| Battery Charger Controller | High-Voltage Floating Bias Supply |
Use Scenario: Constant-voltage/constant-current 12 V lead-acid or LiFePO4 charger with thermal foldback and charge termination signaling. IC Role / Device Role / Timing Role: Adjustable current limiter (via Rsense) and voltage reference; integrates with external MOSFET for higher efficiency. Use Value: IADJ stability ensures accurate current setting (±1%) across temperature; thermal shutdown prevents battery overheat during float stage. |
Use Scenario: +100 V bias supply for photomultiplier tubes (PMTs) or avalanche photodiodes (APDs), referenced to cathode rather than system ground. IC Role / Device Role / Timing Role: Floating regulator referenced to high-voltage output node - accepts 110 V input while regulating 100 V output relative to cathode. Use Value: 40 V max VIN–VOUT enables safe operation with 10 V headroom; low output noise (0.003% of VO) preserves signal integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM317D2T-TR | Same pinout and electrical specs, but rated for 0°C to +125°C junction temperature (vs. −25°C to +150°C for LM217). | Not suitable for extended cold-start industrial environments or high-ambient enclosures (>70°C). | Select LM317D2T-TR only if operating temperature stays within commercial range and cost is primary constraint. |
| TLV1117-33CDR | Fixed 3.3 V output, 800 mA max, 1.2 V dropout, no adjust pin - lacks voltage flexibility and current capability. | Only usable where fixed 3.3 V and lower current suffice; cannot replace LM217D2T-TR in adjustable or >1 A designs. | Choose only for space-constrained, low-power embedded applications requiring fixed output and minimal external components. |
Compared with LM317D2T-TR, the LM217D2T-TR offers wider temperature qualification and higher reliability margin in harsh environments; compared with TLV1117-33CDR, it provides full adjustability, 1.5× current capacity, and floating operation - making it irreplaceable in programmable and high-voltage linear regulation roles.
Availability
LM217D2T-TR is available at Aetrix Electronics and suitable for industrial power supplies, programmable lab bench supplies, battery charger controllers, and high-voltage floating bias supplies requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LM217D2T-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 microcontrollers, power management ICs, analog chips, and discrete devices for automotive, industrial, and consumer markets.
The LM217 series belongs to ST's high-reliability linear regulator product line, engineered specifically for industrial-grade power conversion where wide temperature range, robust protection, and floating topology are mandatory design requirements.
FAQ
What is the minimum load current required for stable regulation?
The LM217D2T-TR requires a minimum load current of 3.5 mA (typical) to maintain regulation, due to internal quiescent current returning to the output pin. Below this threshold - such as in light-load or standby conditions - output voltage may rise unpredictably. A 360 Ω pull-down resistor from output to ground ensures compliance across temperature and line variations.
Can LM217D2T-TR be used in parallel for higher current?
No - the LM217D2T-TR is not designed for direct parallel operation due to mismatched reference voltages and thermal gradients, which cause current hogging and potential 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.
What is the purpose of the ADJUST pin capacitor (CADJ)?
A 10 µF capacitor from ADJUST pin to ground (CADJ) improves AC performance by reducing output ripple by ~15 dB at 120 Hz and enhancing transient response. It stabilizes the reference node against noise coupling and prevents oscillation during fast load steps - especially critical when long traces connect the feedback divider to the IC.
How does SOA protection differ from standard current limiting?
Standard current limiting holds output current constant above threshold; SOA protection in the LM217D2T-TR dynamically reduces current as VIN–VOUT increases - preventing device destruction under high-voltage, high-current stress (e.g., during startup into capacitive loads). This is implemented via internal transistor sizing and biasing, not external components.
LM217D2T-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- 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:
- 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:
- Surface Mount
- Supplier Device Package:
- D2PAK
LM217D2T-TR FAQ
1.How can I place an order for LM217D2T-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM217D2T-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 LM217D2T-TR reliable?
The price and inventory of LM217D2T-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM217D2T-TR is usually 5 days.
3.What payment methods are accepted for LM217D2T-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM217D2T-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM217D2T-TR?
LM217D2T-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM217D2T-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 LM217D2T-TR?
For technical support, including LM217D2T-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM217D2T-TR requirements.
6.How does Aetrix verify that LM217D2T-TR is sourced from the original manufacturer or authorized distributors?
All LM217D2T-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 LM217D2T-TR meets industry standards.
7.What is the process for return or replacement of LM217D2T-TR?
All LM217D2T-TR units undergo pre-shipment inspection (PSI). If there is an issue with LM217D2T-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 LM217D2T-TR part is unused and in its original packaging.
Return procedure for LM217D2T-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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