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onsemi LM317MABDTRK
- Part No.:
- LM317MABDTRK
- Manufacturer:
- onsemi
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
LM317MABDTRK.pdf
- Description:
- IC REG LINEAR POS ADJ 500MA DPAK
- Quantity:
- Payment:
- Shipping:
Inventory:3,450
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Product details
Overview
LM317MABDTRK from onsemi is a 500 mA adjustable positive voltage regulator in DPAK (DT) package, delivering 1.2 V to 37 V output with ±2% initial tolerance, internal thermal shutdown and current limiting, widely used for local on-card regulation and precision current limiting in industrial power supplies.
For engineers reviewing the LM317MABDTRK datasheet, pinout, applications, or equivalent options, key selection criteria include output adjustability range, thermal performance in DPAK, load regulation under 0.5 A, reference voltage stability at 1.25 V, and compatibility with standard two-resistor feedback networks.
Technical Context
The LM317MABDTRK operates as a floating three-terminal linear regulator with a precisely trimmed 1.25 V bandgap reference between output and adjustment terminals. Its internal safe-area compensation and thermal shutdown circuitry enable robust operation without external protection components under overload or high ambient conditions.
It employs constant-current programming via R1–R2 resistor divider, where output voltage is set by VOUT = 1.25 V × (1 + R2/R1) + IADJ × R2, with IADJ controlled below 100 µA. The device supports floating operation for high-voltage applications and requires only 3.5 mA minimum load current to maintain regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 500 mA max - sufficient for mid-power analog rails and sensor biasing without heatsink at moderate ΔVIN−OUT |
| Output Voltage Range | 1.2 V to 37 V - enables single-part flexibility across diverse supply requirements |
| Reference Voltage | 1.225 V to 1.275 V - tight 40 mV tolerance ensures predictable output setting accuracy |
| Line Regulation | 0.01 %/V typ - maintains stable output despite input ripple or transformer sag |
| Load Regulation | 5.0 mV max (VOUT ≤ 5 V) - critical for low-voltage logic and analog circuit stability |
| Thermal Shutdown Threshold | 180 °C - protects against sustained overloads and poor PCB thermal design |
| Adjust Pin Current | 50–100 µA - allows high-value R2 resistors (>10 kΩ) without significant error contribution |
Pinout & Package
DPAK (DT suffix, Case 369C) package with exposed thermal pad connected to Pin 2 (Adjust). Heatsink surface is electrically tied to the adjustment terminal - critical for PCB layout and grounding strategy.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Input (Vin) | Unregulated DC input; must be ≥ (VOUT + 3 V) for proper regulation |
| 2 | Adjust (Adj) | Reference node for feedback network; connects to R1–R2 junction and thermal pad |
| 3 | Output (Vout) | Regulated output; supplies load and returns quiescent current to sustain internal bias |
Key Features
| Feature | Design Value |
|---|---|
| Internal Safe-Area Compensation | Prevents secondary breakdown during transient overloads without external SOA limiting circuits |
| Floating Operation Capability | Enables high-side regulation and programmable current sources without ground-referenced constraints |
| Low IADJ Drift | IADJ change ≤ 5.0 µA over full line/load range - minimizes output error in precision applications |
| Pb-Free DPAK Packaging | RoHS-compliant DT package with thermal pad optimized for 2.0 oz copper PCBs per Figure 25 |
Applications
| Industrial Power Supply | Programmable Current Source |
|---|---|
Use Scenario: Local regulation for PLC I/O modules requiring stable 3.3 V or 5 V rails from 12–24 V bus. IC Role / Device Role / Timing Role: Primary linear regulator providing low-noise, low-ripple DC output with minimal external components. Use Value: Eliminates need for multiple fixed-voltage regulators; ±2% tolerance ensures compliance with industrial logic voltage specs. | Use Scenario: Precision LED driver or sensor excitation circuit demanding 10–500 mA constant current. IC Role / Device Role / Timing Role: Adjustable current limiter using fixed R1 and variable R2 to set IOUT = 1.25 V / R1. Use Value: Achieves <1% current accuracy with 1% R1 tolerance; thermal shutdown prevents LED thermal runaway. |
| Test Equipment Bias Supply | Automotive Subsystem Regulator |
Use Scenario: Benchtop multimeter or oscilloscope auxiliary rail requiring low-drift, low-noise ±15 V supplies. IC Role / Device Role / Timing Role: Low-noise adjustable regulator with CADJ bypass for enhanced ripple rejection (>80 dB at 120 Hz). Use Value: RMS noise <0.003% of VOUT enables clean analog front-end biasing without added filtering. | Use Scenario: Non-safety-critical infotainment subsystem (e.g., display backlight control) in vehicles meeting AEC-Q100 Grade 2. IC Role / Device Role / Timing Role: Robust local regulator tolerant of automotive load dump transients and wide temperature range (−40°C to +125°C). Use Value: NCV317MA variant qualification confirmed; LM317MABDTRK shares identical DPAK footprint and electrical specs for drop-in evaluation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM317LDTRKG | Same DPAK package, but rated for 100 mA max output current and lower thermal limits (RθJA = 120°C/W vs. 92°C/W) | Suitable only for low-power sensor bias or microcontroller peripherals - insufficient for 500 mA loads | Select LM317MABDTRK when >300 mA continuous output or higher thermal margin is required. |
| TLV1117-33CDR | Fixed 3.3 V output, SOT-223 package, 800 mA max, but no adjustability and narrower input range (up to 15 V) | Limited to single-voltage applications; lacks programmability and high-voltage capability (≤37 V) | Choose LM317MABDTRK when output voltage flexibility, high-VIN, or current-limiting functionality is needed. |
Compared with LM317LDTRKG and TLV1117-33CDR, the LM317MABDTRK uniquely combines 500 mA output, 37 V input capability, and full adjustability in a thermally efficient DPAK - making it irreplaceable for multi-rail industrial designs requiring field-programmable voltage or current settings.
Availability
LM317MABDTRK is available at Aetrix Electronics and suitable for industrial power supplies, test equipment bias rails, programmable current sources, and automotive infotainment subsystems requiring stable component supply and long-term lifecycle continuity.
Supply support for LM317MABDTRK 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
onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power management, analog, and sensing solutions for automotive, industrial, and cloud infrastructure markets.
The LM317MABDTRK belongs to onsemi's legacy linear regulator product line, designed for cost-sensitive, high-reliability applications where simplicity, ruggedness, and wide operating range outweigh switching efficiency requirements.
FAQ
What is the maximum input-to-output voltage differential supported by the LM317MABDTRK?
The LM317MABDTRK supports a maximum input-output voltage differential of 40 Vdc, as specified in its Absolute Maximum Ratings table. This allows operation with inputs up to 40 V above the regulated output - for example, generating 5 V from a 45 V source. Exceeding this limit risks permanent damage, and thermal dissipation must be verified using the device's 92°C/W junction-to-air thermal resistance in DPAK package.
Does the LM317MABDTRK require an input capacitor, and if so, what value is recommended?
Yes, the LM317MABDTRK requires a 0.1 µF ceramic or disc input bypass capacitor (CIN) placed close to Pins 1 and 2, especially when the regulator is located appreciable distance from the main power supply filter. This capacitor reduces sensitivity to input line impedance and prevents potential instability or oscillation due to source inductance. The LM317MABDTRK datasheet explicitly states CIN is required under such conditions.
Can the LM317MABDTRK be used as a precision current regulator, and how is it configured?
Yes, the LM317MABDTRK can be configured as a precision current regulator by connecting a single resistor (RSET) between the output and adjustment terminals, with the load returned to ground. In this configuration, load current ILOAD ≈ 1.25 V / RSET. For example, a 2.5 Ω resistor sets 500 mA output. The LM317MABDTRK's low IADJ drift (<5 µA) and tight reference voltage (±1.25 V) ensure high accuracy, and its internal current limiting provides inherent short-circuit protection.
What is the minimum load current required for the LM317MABDTRK to maintain regulation?
The LM317MABDTRK requires a minimum load current of 3.5 mA to 10 mA (typical 3.5 mA) to maintain regulation, particularly when the input-output differential exceeds 20 V. This current ensures sufficient quiescent flow through the internal reference circuitry. If the load draws less than this minimum - for instance, in standby mode - the output voltage may rise uncontrollably. A bleeder resistor from VOUT to ground is commonly used to guarantee compliance with this requirement for the LM317MABDTRK.
How does the thermal pad connection affect PCB layout for the LM317MABDTRK?
The thermal pad of the LM317MABDTRK (DPAK package) is internally connected to Pin 2 (Adjust), not ground or output. Therefore, the PCB copper pour tied to the pad must be routed as part of the adjustment node - typically connected to the R1–R2 feedback junction. Incorrect grounding of the pad introduces measurement error and destabilizes regulation. Layout must isolate this net from noisy grounds while maximizing copper area (per Figure 25) to achieve the rated 92°C/W thermal resistance.
LM317MABDTRK Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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):
- 10 mA
- Current - Supply (Max):
- -
- PSRR:
- 80dB ~ 65dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature, Short Circuit
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DPAK
LM317MABDTRK FAQ
1.How can I place an order for LM317MABDTRK through Aetrix?
Please submit a Request for Quotation (RFQ) for LM317MABDTRK 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 LM317MABDTRK reliable?
The price and inventory of LM317MABDTRK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM317MABDTRK is usually 5 days.
3.What payment methods are accepted for LM317MABDTRK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM317MABDTRK transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM317MABDTRK?
LM317MABDTRK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM317MABDTRK 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 LM317MABDTRK?
For technical support, including LM317MABDTRK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM317MABDTRK requirements.
6.How does Aetrix verify that LM317MABDTRK is sourced from the original manufacturer or authorized distributors?
All LM317MABDTRK 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 LM317MABDTRK meets industry standards.
7.What is the process for return or replacement of LM317MABDTRK?
All LM317MABDTRK units undergo pre-shipment inspection (PSI). If there is an issue with LM317MABDTRK, 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 LM317MABDTRK part is unused and in its original packaging.
Return procedure for LM317MABDTRK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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