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Texas Instruments LM5017MRE/NOPB
- Part No.:
- LM5017MRE/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM5017MRE/NOPB.pdf
- Description:
- IC REG BUCK ADJ 600MA 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:811
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Product details
Overview
LM5017MRE/NOPB from Texas Instruments is a 100-V, 600-mA synchronous buck/Fly-Buck™ regulator with integrated 100-V high-side and low-side MOSFETs, constant on-time (COT) control, no loop compensation required, and adjustable output voltage starting at 1.225 V. It enables isolated DC/DC bias supplies in telecom systems and industrial PLCs.
For engineers reviewing the LM5017MRE/NOPB datasheet, LM5017MRE/NOPB pinout, LM5017MRE/NOPB application, or LM5017MRE/NOPB equivalent, key selection criteria include input voltage range (7.5–100 V), peak current limit (0.7–1.3 A), thermal shutdown (165°C), FB reference accuracy (±2%), and SO PowerPAD-8 package compatibility with exposed thermal pad.
Technical Context
The LM5017MRE/NOPB implements adaptive constant on-time control where on-time varies inversely with VIN to maintain nearly constant switching frequency across input and load variations. Its COT architecture eliminates need for external loop compensation while delivering ultra-fast transient response.
It integrates a 7.6-V internal VCC regulator with 4.5-V UVLO, intelligent peak current limiting with VIN- and VFB-dependent off-timer, and dual-level undervoltage detection via UVLO pin (1.225 V turn-on, 0.66 V shutdown). The device supports both buck and Fly-Buck™ topologies without external Schottky diodes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 7.5 V to 100 V - supports direct connection to 24-V industrial, 48-V telecom, and PoE+ rails without pre-regulation. |
| Output Current | 600 mA continuous - determined by thermal design and layout; peak switch current limit is 0.7–1.3 A. |
| Feedback Reference | 1.225 V ±2% - sets regulated output via external resistor divider; enables precise VOUT adjustment down to 1.225 V. |
| Switching Frequency | Nearly constant - set by RON and VIN; typical 200 kHz at 48 V input; adjustable up to 1 MHz. |
| Thermal Shutdown | 165°C with 20°C hysteresis - disables switching and VCC regulator until junction cools to ~145°C. |
| VCC Regulator Output | 7.6 V ±1.3 V - powers internal gate drivers and logic; self-biased from VIN; disabled if externally supplied 8.55–13 V applied. |
| Minimum Off-Time | 144 ns - ensures sufficient time for BST capacitor recharge; critical for stable bootstrap operation. |
Pinout & Package
LM5017MRE/NOPB is packaged in SO PowerPAD™-8 (DDA), 4.89 mm × 3.90 mm body with exposed thermal pad soldered to RTN for enhanced thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 RTN | Ground reference | Primary GND connection; exposed pad must be soldered to system ground plane for thermal and electrical integrity. |
| 2 VIN | Main power input | Accepts 7.5–100 V; powers internal VCC regulator and high-voltage gate drivers. |
| 3 UVLO | Undervoltage threshold control | Resistor divider from VIN sets startup voltage (1.225 V threshold); pulled below 0.66 V forces shutdown. |
| 4 RON | On-time programming | Resistor to VIN sets minimum on-time; ensures stable operation and frequency control across input range. |
| 5 FB | Feedback input | Compares output voltage (via resistor divider) to 1.225 V reference; ripple-sensitive node requiring ≥25 mV AC component. |
| 6 VCC | Bias supply output | 7.6 V regulated output for internal circuitry; requires 1-μF decoupling; UVLO at 4.5 V disables IC. |
| 7 BST | Bootstrap supply | Connects to SW via 0.01-μF ceramic capacitor; charged by internal diode from VCC during SW low phase. |
| 8 SW | Power switching node | Drives external inductor; connects to BST capacitor and output filter; handles full switching voltage/current stress. |
Key Features
| Feature | Design Value |
|---|---|
| Constant On-Time (COT) Control | Eliminates need for external compensation network; enables fast transient response and stable operation across wide VIN/VOUT ratios. |
| Integrated Dual MOSFETs | 100-V N-channel high-side and synchronous rectifier switches reduce BOM count and eliminate external Schottky diode. |
| Intelligent Peak Current Limit | Off-time scales with VIN and VFB - provides robust short-circuit protection without excessive foldback at light overloads. |
| Programmable UVLO & Shutdown | Independent threshold and hysteresis setting via UVLO pin; remote shutdown enabled by pulling UVLO < 0.66 V. |
| Thermal Protection with Recovery | Auto-restart after thermal shutdown (165°C trip, 145°C release) prevents latch-up and supports unattended operation. |
Applications
| Industrial PLC Power Supply | Smart Power Meter Bias |
|---|---|
Use Scenario: Providing isolated 5-V or 3.3-V bias for I/O modules and communication interfaces in programmable logic controllers operating from 24-V DC bus. IC Role / Device Role / Timing Role: Primary-side synchronous buck controller implementing non-isolated local regulation or secondary-side Fly-Buck™ converter for isolated auxiliary rails. Use Value: Enables single-chip solution for wide-input industrial rails with no external diode or compensation components, reducing footprint and bill-of-materials cost. | Use Scenario: Generating isolated 12-V or 5-V auxiliary supply from 100-V DC link in smart electricity meters with metrology and RF communication subsystems. IC Role / Device Role / Timing Role: Fly-Buck™ topology controller delivering galvanically isolated output without optocoupler or transformer feedback winding. Use Value: Achieves >80% efficiency at 100-mA load with inherent primary-side regulation, eliminating need for secondary-side feedback circuitry. |
| Telecom Primary-Side Bias | Low-Power Isolated DC/DC |
Use Scenario: Generating 5-V or 12-V bias for control circuitry in telecom base station power supplies fed from 48-V backplane. IC Role / Device Role / Timing Role: High-efficiency buck regulator operating directly from 48-V rail with minimal external components and no loop tuning. Use Value: Delivers stable output under dynamic load transients common in digital signal processing units, leveraging COT's ultra-fast response. | Use Scenario: Providing isolated 3.3-V or 5-V supply for sensor interfaces or microcontrollers in space-constrained IoT edge devices. IC Role / Device Role / Timing Role: Compact Fly-Buck™ converter using standard off-the-shelf transformers and no optocoupler, supporting ≤600-mA output. Use Value: Reduces solution size and cost versus discrete flyback designs while maintaining safety isolation and EMI performance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck/Fly-Buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5160QPWPRQ1 | 4.5–65-V input, 600-mA, integrated 65-V FETs; includes soft-start and spread-spectrum; automotive-grade AEC-Q100 qualified. | Not rated for >65-V input; unsuitable for 100-V industrial or telecom primary-side use. | Select when automotive qualification or lower EMI is required and input stays ≤65 V. |
| LM5018MRE/NOPB | Same pinout, package, and feature set; differs only in internal current limit (1.2 A vs. 1.02 A typ) and minor timing parameters. | Functionally interchangeable in most buck designs; Fly-Buck™ performance identical under same layout and magnetics. | Choose LM5018MRE/NOPB for higher peak current margin in short-circuit-prone environments. |
Compared with LM5017MRE/NOPB, LM5160QPWPRQ1 offers automotive qualification but lacks 100-V capability, while LM5018MRE/NOPB provides slightly higher current limit with full pin-to-pin compatibility-making it the preferred drop-in upgrade for demanding overload conditions.
Availability
LM5017MRE/NOPB is available at Aetrix Electronics and suitable for industrial programmable logic controllers (PLC), smart power meters, and telecom bias supplies requiring stable component supply, long-term lifecycle support, and consistent parametric performance.
Supply support for LM5017MRE/NOPB 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
Texas Instruments is a global semiconductor company headquartered in Dallas, Texas, specializing in analog, embedded processing, and power management technologies with broad industrial and automotive design expertise.
The LM5017MRE/NOPB belongs to TI's high-voltage DC/DC regulator product line, engineered specifically for efficient, compact, and reliable step-down conversion from 24-V to 100-V input sources in harsh industrial and telecom environments.
FAQ
What is the maximum input voltage rating for the LM5017MRE/NOPB?
The LM5017MRE/NOPB has an absolute maximum input voltage rating of 100 V applied between VIN and RTN. Its recommended operating input range is 7.5 V to 100 V, enabling direct connection to 24-V, 48-V, and PoE+ systems without pre-regulation. Exceeding 100 V may cause permanent damage per Absolute Maximum Ratings table.
Does the LM5017MRE/NOPB require external loop compensation components?
No, the LM5017MRE/NOPB uses constant on-time (COT) control architecture that eliminates the need for external compensation networks. Stability is inherently maintained through the relationship between on-time, input voltage, and feedback ripple-reducing design complexity and component count compared to voltage-mode or current-mode controllers.
Can the LM5017MRE/NOPB be used in Fly-Buck™ topology applications?
Yes, the LM5017MRE/NOPB is explicitly designed and characterized for Fly-Buck™ operation. Its integrated high-side and synchronous rectifier switches, coupled with COT control and no requirement for secondary-side feedback, enable isolated DC/DC conversion using standard coupled inductors-validated in TI's typical application circuits and application notes.
What is the purpose of the RON pin on the LM5017MRE/NOPB?
The RON pin on the LM5017MRE/NOPB programs the minimum on-time duration by connecting a resistor between RON and VIN. This resistor sets the switching frequency in conjunction with input voltage, ensuring stable operation and nearly constant frequency across the 7.5–100 V input range. Minimum recommended on-time is 100 ns at maximum VIN.
How does thermal management work in the LM5017MRE/NOPB?
The LM5017MRE/NOPB incorporates thermal shutdown at 165°C with 20°C hysteresis, disabling switching and the VCC regulator until junction temperature falls to ~145°C. Effective thermal performance relies on soldering the exposed PowerPAD to a large RTN copper area-SO PowerPAD-8 package achieves 41.1°C/W junction-to-ambient resistance with proper PCB layout.
LM5017MRE/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 7.5V
- Voltage - Input (Max):
- 100V
- Voltage - Output (Min/Fixed):
- 1.225V
- Voltage - Output (Max):
- 90V
- Current - Output:
- 600mA
- Frequency - Switching:
- Adj to 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO PowerPad
LM5017MRE/NOPB FAQ
1.How can I place an order for LM5017MRE/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5017MRE/NOPB 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 LM5017MRE/NOPB reliable?
The price and inventory of LM5017MRE/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5017MRE/NOPB is usually 5 days.
3.What payment methods are accepted for LM5017MRE/NOPB?
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4.How is shipping managed for LM5017MRE/NOPB?
LM5017MRE/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5017MRE/NOPB 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 LM5017MRE/NOPB?
For technical support, including LM5017MRE/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5017MRE/NOPB requirements.
6.How does Aetrix verify that LM5017MRE/NOPB is sourced from the original manufacturer or authorized distributors?
All LM5017MRE/NOPB 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 LM5017MRE/NOPB meets industry standards.
7.What is the process for return or replacement of LM5017MRE/NOPB?
All LM5017MRE/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM5017MRE/NOPB, 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 LM5017MRE/NOPB part is unused and in its original packaging.
Return procedure for LM5017MRE/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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