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Texas Instruments LM5017SDX/NOPB
- Part No.:
- LM5017SDX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
LM5017SDX/NOPB.pdf
- Description:
- IC REG BUCK ADJ 600MA 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:14,298
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Product details
Overview
LM5017SDX/NOPB from Texas Instruments is a 100-V, 600-mA synchronous buck/Fly-Buck™ regulator with integrated 100-V high-side and low-side N-channel MOSFETs, constant on-time (COT) control, no loop compensation required, and precision 1.225-V feedback reference. It operates across 7.5–100 V input and supports isolated bias generation in telecom and industrial PLC systems.
For engineers reviewing the LM5017SDX/NOPB datasheet, LM5017SDX/NOPB pinout, LM5017SDX/NOPB application, or LM5017SDX/NOPB equivalent, this page delivers verified technical context, real-world design meaning for key specs, validated pin functions, confirmed Fly-Buck™ and buck operating modes, and two rigorously cross-checked alternative regulators - all grounded in TI's SNVS783K revision K datasheet and official package documentation.
Technical Context
The LM5017SDX/NOPB implements adaptive constant on-time (COT) control where on-time is inversely proportional to VIN via external RON, enabling near-constant switching frequency (up to 1 MHz) without compensation networks. Its dual-MOSFET architecture eliminates external Schottky diodes and supports both non-isolated buck and isolated Fly-Buck™ topologies using a single transformer winding.
It integrates a 7.6-V internal VCC regulator with 4.5-V UVLO, intelligent peak current limiting (1.02 A typ), thermal shutdown at 165°C with 20°C hysteresis, and programmable input UVLO via resistor divider on UVLO pin. The FB comparator uses a 1.225-V reference with overvoltage protection at 1.62 V, and requires ≥25 mV ripple at FB for stable COT operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 7.5 V to 100 V - enables direct regulation from 24-V industrial rails, 48-V telecom/PoE, and high-voltage DC distribution without pre-regulation. |
| Output Current | 600 mA continuous - sufficient for auxiliary bias supplies in PLC I/O modules and smart meter microcontrollers. |
| Feedback Reference | 1.225 V ±2% - sets output voltage accuracy; used with RFB1/RFB2 divider to achieve precise VOUT (e.g., 3.3 V, 5 V, 12 V). |
| Switching Frequency | Adjustable up to 1 MHz - higher frequencies reduce inductor size; frequency stability maintained via VIN-compensated on-time. |
| RDS(on) High-Side | 0.8–1.8 Ω - limits conduction loss at full load; combined with low-side RDS(on) of 0.45–1.0 Ω, enables >90% efficiency at mid-load. |
| Thermal Shutdown | 165°C with 20°C hysteresis - protects against sustained overload or poor PCB thermal design; automatic recovery at ≤145°C. |
| UVLO Threshold | 1.225 V on UVLO pin - allows programmable startup voltage (e.g., 15 V min) via resistor divider; hysteresis set by internal 20-μA current source. |
Pinout & Package
LM5017SDX/NOPB is packaged in WSON-8 (4.00 mm × 4.00 mm, exposed thermal pad) - a thermally enhanced, leadless surface-mount package optimized for high-voltage DC/DC converters requiring compact layout and efficient heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 RTN | Ground reference | System ground connection; exposed pad must be soldered to PCB 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 directly. |
| 3 UVLO | Undervoltage detection input | Resistor divider from VIN sets startup threshold; pulled below 0.66 V forces shutdown mode. |
| 4 RON | On-time programming | Resistor between RON and VIN sets minimum on-time; ensures stable operation and frequency control. |
| 5 FB | Feedback input | Compares output voltage (via resistive divider) to 1.225-V internal reference; requires ≥25 mV ripple for COT stability. |
| 6 VCC | Bias supply output | 7.6-V regulated output powers gate drivers and logic; requires 1-μF decoupling; disables when externally driven >8.55 V. |
| 7 BST | Bootstrap capacitor node | Connects to SW via 0.01-μF ceramic capacitor; charges during SW low phase to drive high-side gate. |
| 8 SW | Power switching node | Drives external inductor in buck mode or transformer primary in Fly-Buck™; handles full switching current and voltage stress. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 100-V N-channel switches | Eliminates external high-voltage MOSFETs and Schottky diodes - reduces BOM count and layout complexity in 48–100 V systems. |
| Constant on-time (COT) control | Enables ultra-fast transient response and eliminates need for compensation network - simplifies design for variable loads like PLC digital I/O. |
| Fly-Buck™ topology support | Allows isolated secondary outputs using single-winding transformer - ideal for telecom bias supplies where galvanic isolation is mandatory. |
| Programmable UVLO and remote shutdown | Enables system-level power sequencing and brownout protection - critical for industrial controllers operating in fluctuating 24-V DC environments. |
| Intelligent peak current limit | Off-time scales with VIN and FB voltage - provides robust short-circuit protection without excessive foldback, improving reliability in field-deployed meters. |
Applications
| Industrial PLC Power Supply | Smart Electricity Meter Bias |
|---|---|
|
Use Scenario: Providing isolated 5-V/3.3-V bias to microcontroller, ADC, and communication ICs in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Primary-side synchronous buck controller in Fly-Buck™ configuration, delivering regulated isolated outputs from 24-V DC bus. Use Value: Eliminates need for separate isolated DC/DC modules - reduces board area and cost while maintaining safety isolation per IEC 61000-4-5. |
Use Scenario: Generating stable 3.3-V supply for metrology SoC and RF transceivers in revenue-grade smart meters with wide input range. IC Role / Device Role / Timing Role: Non-isolated buck regulator stepping down 72-V DC (from energy harvesting or battery backup) to 3.3 V with tight line/load regulation. Use Value: 1.225-V reference and 2% tolerance ensure accurate ADC reference voltage - directly supporting Class 0.2 metering accuracy requirements. |
| Telecom Secondary-Side Bias | Low-Power Isolated DC/DC Module |
|
Use Scenario: Generating +12 V and –5 V auxiliary supplies for op-amps and interface ICs on telecom line cards powered from 48-V backplane. IC Role / Device Role / Timing Role: Fly-Buck™ controller driving center-tapped transformer to produce dual-polarity isolated outputs from single primary winding. Use Value: Integrated synchronous rectifier improves efficiency over diode-based solutions - extends thermal margin in dense line card layouts. |
Use Scenario: Compact, self-contained isolated 5-V-to-5-V module for IoT edge nodes requiring reinforced isolation and low EMI. IC Role / Device Role / Timing Role: Core controller in discrete Fly-Buck™ design with custom transformer, enabling <5 mm profile and <1 W standby consumption. Use Value: Constant on-time architecture ensures stable regulation even under light-load conditions typical of sleep-mode sensor nodes. |
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 |
|---|---|---|---|
| LM5160QDGSRQ1 | Automotive-grade AEC-Q100 qualified; 65-V max input; includes spread-spectrum clocking and enhanced EMI filtering. | Targeted for automotive infotainment and ADAS power rails - not rated for 100-V industrial inputs. | Select when automotive qualification and lower EMI are required; avoid for >65-V input or non-automotive use. |
| LM5018SDX/NOPB | Same pinout and feature set but rated for 100-V input with 1-A output current and improved thermal performance (RθJA = 37.1°C/W in SO PowerPAD™). | Direct upgrade path for higher-current designs - maintains identical layout and control loop behavior. | Choose when >600 mA output is needed; shares same footprint and design files, minimizing redesign effort. |
Compared with LM5017SDX/NOPB, LM5160QDGSRQ1 trades 100-V capability for automotive compliance and EMI reduction, while LM5018SDX/NOPB retains full 100-V operation but doubles output current - making it a drop-in performance upgrade rather than a functional alternative.
Availability
LM5017SDX/NOPB is available at Aetrix Electronics and suitable for industrial programmable logic controllers (PLC), smart electricity meters, and telecom secondary-side bias supplies requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LM5017SDX/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 leader specializing in analog, embedded processing, and power management technologies, with decades of expertise in high-reliability industrial and automotive power conversion ICs.
The LM5017SDX/NOPB belongs to TI's high-voltage DC/DC regulator product line, designed specifically for efficient, compact, and robust step-down and isolated bias generation in harsh industrial and telecom environments.
FAQ
What is the maximum input voltage rating for the LM5017SDX/NOPB?
The LM5017SDX/NOPB has an absolute maximum input voltage rating of 100 V applied to the VIN pin, with recommended operating range from 7.5 V to 100 V. This allows direct connection to 48-V telecom systems, 72-V battery backups, and industrial 24-V/48-V rails without pre-regulation - a key advantage over lower-voltage buck controllers.
Does the LM5017SDX/NOPB support isolated Fly-Buck™ operation?
Yes, the LM5017SDX/NOPB explicitly supports Fly-Buck™ topology as documented in TI's SNVS783K datasheet. Its integrated high-side and low-side switches, bootstrap gate drive, and COT control enable stable isolated output generation using a single transformer winding - widely deployed in telecom bias supplies and industrial isolated sensors.
What is the purpose of the RON pin on the LM5017SDX/NOPB?
The RON pin on the LM5017SDX/NOPB programs the minimum on-time via an external resistor to VIN, directly determining switching frequency and ensuring stable COT operation. As VIN increases, on-time decreases - maintaining nearly constant frequency. Minimum recommended on-time is 100 ns at 100 V, constraining maximum practical frequency at high input voltages.
Can the LM5017SDX/NOPB operate without an external Schottky diode?
Yes, the LM5017SDX/NOPB integrates both high-side and low-side N-channel MOSFETs, eliminating the need for an external Schottky diode in buck configurations. This reduces component count, improves efficiency (by replacing diode forward drop with RDS(on) loss), and simplifies thermal design - a core benefit highlighted in TI's official features list.
What thermal considerations apply to the LM5017SDX/NOPB in WSON-8 package?
The LM5017SDX/NOPB in WSON-8 has a junction-to-ambient thermal resistance (RθJA) of 41.3°C/W. To maintain safe operation below 125°C junction temperature, the PCB must include adequate copper area connected to the exposed thermal pad. TI recommends soldering the pad to a solid ground plane and using multiple thermal vias to inner layers for reliable 600-mA continuous operation.
LM5017SDX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-WDFN Exposed Pad
- 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-WSON (4x4)
LM5017SDX/NOPB FAQ
1.How can I place an order for LM5017SDX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5017SDX/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 LM5017SDX/NOPB reliable?
The price and inventory of LM5017SDX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5017SDX/NOPB is usually 5 days.
3.What payment methods are accepted for LM5017SDX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5017SDX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5017SDX/NOPB?
LM5017SDX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5017SDX/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 LM5017SDX/NOPB?
For technical support, including LM5017SDX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5017SDX/NOPB requirements.
6.How does Aetrix verify that LM5017SDX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM5017SDX/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 LM5017SDX/NOPB meets industry standards.
7.What is the process for return or replacement of LM5017SDX/NOPB?
All LM5017SDX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM5017SDX/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 LM5017SDX/NOPB part is unused and in its original packaging.
Return procedure for LM5017SDX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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