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Texas Instruments LM5017SD/NOPB
- Part No.:
- LM5017SD/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
LM5017SD/NOPB.pdf
- Description:
- IC REG BUCK ADJ 600MA 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:1,162
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Product details
Overview
LM5017SD/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 precision 1.225-V feedback reference. It operates across 7.5–100 V input, delivers adjustable output down to 1.225 V, and supports isolated bias generation in telecom and industrial PLC systems.
For engineers reviewing the LM5017SD/NOPB datasheet, LM5017SD/NOPB pinout, LM5017SD/NOPB application, or LM5017SD/NOPB equivalent, key selection criteria include its COT architecture enabling ultra-fast transient response, intelligent peak current limit (1.02 A typ), thermal shutdown (165°C), and dual-package availability (WSON-8 and SO PowerPAD-8) for high-voltage DC/DC conversion in space-constrained industrial and telecom designs.
Technical Context
The LM5017SD/NOPB implements adaptive constant on-time control where on-time varies inversely with VIN-enabling nearly constant switching frequency (up to 1 MHz) across wide input voltage ranges without external compensation. Its internal 7.6-V VCC regulator powers gate drivers and logic, while bootstrap capacitor charging via internal diode ensures reliable high-side drive.
It integrates dual protection: programmable UVLO (1.225 V threshold, 0.66 V shutdown) and intelligent current-limit off-timer whose duration scales with VIN and FB voltage-ensuring robust short-circuit handling up to 100 V input. The synchronous rectifier maintains continuous conduction mode (CCM) even at light loads, eliminating need for external Schottky diodes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 7.5 V to 100 V - enables direct regulation from 24 V industrial buses, 48 V telecom/PoE, and 100 V HV rails without pre-regulation. |
| Output Current | 600 mA - maximum continuous load current with integrated MOSFETs; peak current limit set at 1.02 A (min). |
| Feedback Reference | 1.225 V ±2% - precise internal reference enabling accurate output voltage setting via external resistor divider. |
| Switching Frequency | Up to 1 MHz - adjustable via RON resistor; frequency remains stable across line/load due to COT architecture. |
| Thermal Shutdown | 165°C with 20°C hysteresis - automatic recovery at ~145°C prevents catastrophic failure during overload or poor heatsinking. |
| VCC Regulator Output | 7.6 V (6.25–8.55 V) - powers internal circuitry and gate drivers; disables when externally supplied 8.55–13 V applied. |
| Minimum Off-Time | 144 ns - ensures sufficient bootstrap capacitor recharge time and limits minimum achievable duty cycle. |
Pinout & Package
LM5017SD/NOPB is packaged in an 8-pin WSON (4.00 mm × 4.00 mm) with exposed thermal pad, optimized for high-voltage, space-constrained PCB layouts and enhanced thermal performance (RθJA = 41.3°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RTN | Ground reference | Primary GND connection; exposed pad must be soldered to system ground plane for thermal and EMI integrity. |
| VIN | Main power input | Accepts 7.5–100 V DC; supplies both power stage and internal VCC regulator. |
| UVLO | Undervoltage detection input | Resistor divider from VIN sets startup threshold (1.225 V) and hysteresis; pulled below 0.66 V forces shutdown. |
| RON | On-time programming | Resistor between RON and VIN sets switch on-time inversely proportional to VIN-determines operating frequency. |
| FB | Feedback input | Compares output voltage (via resistor divider) to 1.225 V reference; ripple ≥25 mV required for stable COT operation. |
| VCC | Bias supply output | 7.6 V regulated output powering gate drivers and logic; requires 1-μF decoupling capacitor. |
| BST | Bootstrap supply | Connects to SW via 0.01-μF ceramic capacitor; charged by VCC through internal diode during SW low phase. |
| 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 |
|---|---|
| No loop compensation required | Constant on-time architecture eliminates external compensation network-reducing BOM count and layout sensitivity. |
| Integrated 100-V MOSFETs | High-side and synchronous rectifier switches co-integrated-enabling compact, high-efficiency buck or Fly-Buck™ isolation without external FETs or Schottky diodes. |
| Intelligent peak current limit | Off-time scales with VIN and FB voltage-providing tighter short-circuit protection at high input voltages and reduced foldback during moderate overloads. |
| Adjustable undervoltage lockout | Independent programming of UVLO threshold and hysteresis via external resistor divider-supporting custom brown-in/brown-out behavior for system-level sequencing. |
| Fly-Buck™ topology support | Capable of isolated DC/DC conversion using coupled inductor-eliminating need for optocoupler or auxiliary winding in low-power secondary bias applications. |
Applications
| Industrial PLC Power Supply | Smart Power Meter Bias |
|---|---|
Use Scenario: Providing regulated 5 V or 3.3 V bias to I/O modules, analog front-ends, and microcontrollers in DIN-rail mounted programmable logic controllers operating from 24 V or 48 V DC bus. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering 600 mA with fast transient response to handle burst-mode sensor sampling and communication interrupts. Use Value: Eliminates external Schottky diode and compensation components while maintaining stable regulation under wide input variation (24–48 V) and load steps up to 500 mA. | Use Scenario: Generating isolated 12 V or 5 V auxiliary supply for metrology ICs, RTC, and RF transceivers in revenue-grade smart electricity meters powered from AC/DC front-end. IC Role / Device Role / Timing Role: Fly-Buck™ converter using coupled inductor to derive isolated secondary outputs without optocoupler feedback-reducing cost and board area. Use Value: Achieves <1% output regulation drift over temperature and lifetime, with built-in UVLO and thermal shutdown meeting IEC 62053-21 accuracy and safety requirements. |
| Telecom Primary-Side Bias | Low-Power Isolated DC/DC |
Use Scenario: Generating 5 V or 12 V bias for control circuitry on primary side of telecom AC/DC adapters or PoE injectors operating from 36–75 V DC input. IC Role / Device Role / Timing Role: High-voltage synchronous buck regulator with integrated 100-V switches-replacing discrete high-side driver + MOSFET solutions. Use Value: Reduces solution size by >40% versus discrete alternatives while maintaining >90% efficiency at 48 V input and 500 mA load. | Use Scenario: Providing galvanically isolated 3.3 V or 5 V supply for isolated gate drivers, ADC references, or CAN transceivers in motor drives or EV battery management systems. IC Role / Device Role / Timing Role: Fly-Buck™ regulator using single coupled inductor to generate isolated output-leveraging COT control for tight regulation without secondary-side feedback. Use Value: Enables <100 μA standby current and <1% cross-regulation error between primary and secondary outputs-critical for low-power always-on subsystems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5164PWPR | 4.5–65 V input, 3.5 A output, same COT architecture but higher current; no integrated low-side FET-requires external sync rectifier. | Better suited for higher-current (>1 A) non-isolated buck applications; lacks Fly-Buck™ capability due to missing low-side switch. | Select LM5164PWPR only when >1 A output and non-isolated topology are required; LM5017SD/NOPB remains optimal for 600 mA Fly-Buck™ or space-constrained 100 V designs. |
| MAX17572ATP+ | 4.5–60 V input, 2 A output, peak-current-mode control with full compensation; includes PMBus interface and extensive fault reporting. | Targeted at digitally managed power systems requiring telemetry and sequencing-adds complexity and cost not needed for basic isolated bias. | Choose MAX17572ATP+ only if digital monitoring, margining, or multi-rail coordination is mandatory; LM5017SD/NOPB offers simpler, lower-cost analog solution for fixed-function isolated bias. |
Compared with LM5164PWPR and MAX17572ATP+, the LM5017SD/NOPB uniquely combines 100-V input rating, integrated synchronous rectifier, and Fly-Buck™ capability in a single 8-pin WSON package-making it the only option among the three that supports isolated low-power bias generation without secondary-side components or digital infrastructure.
Availability
LM5017SD/NOPB is available at Aetrix Electronics and suitable for industrial PLC power supplies, smart power meter bias circuits, and telecom primary-side bias applications requiring stable component supply, long-term manufacturability, and automotive-grade reliability screening.
Supply support for LM5017SD/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 power conversion ICs.
The LM5017SD/NOPB belongs to TI's high-voltage DC/DC regulator product line, engineered specifically for industrial, telecom, and energy metering applications demanding robust 100-V operation, integrated power stages, and simplified Fly-Buck™ isolation.
FAQ
What is the maximum input voltage supported by the LM5017SD/NOPB?
The LM5017SD/NOPB supports a maximum input voltage of 100 V, with absolute maximum rating confirmed at VIN to RTN = 100 V. This allows direct operation from unregulated 48 V telecom lines, 72 V industrial buses, or rectified AC inputs without pre-regulation-making LM5017SD/NOPB ideal for high-voltage industrial and telecom power supplies.
Does the LM5017SD/NOPB require external compensation components?
No, the LM5017SD/NOPB uses constant on-time (COT) control architecture, which eliminates the need for external loop compensation components such as type-II or type-III networks. This simplifies design, reduces BOM count, and improves transient response-key advantages confirmed in the LM5017SD/NOPB datasheet Section 7.3.1 and Figure 7-1.
Can the LM5017SD/NOPB be used in Fly-Buck™ topology?
Yes, the LM5017SD/NOPB is explicitly designed for Fly-Buck™ operation, as stated in its official title and Section 2 Applications. Its integrated synchronous rectifier, COT control, and pinout support coupled-inductor isolation-enabling generation of isolated secondary outputs without optocouplers or auxiliary windings, a capability verified in LM5017SD/NOPB typical application circuits (Figure 2).
What is the purpose of the RON pin on the LM5017SD/NOPB?
The RON pin on the LM5017SD/NOPB sets the switch on-time via an external resistor connected to VIN. As defined in Equation 3 of the LM5017SD/NOPB datasheet, on-time is inversely proportional to VIN and RON value-directly determining operating frequency and ensuring stability across wide input ranges without compensation.
What thermal protection features does the LM5017SD/NOPB include?
The LM5017SD/NOPB includes thermal shutdown triggered at 165°C (typical) with 20°C hysteresis, allowing automatic recovery at ~145°C. This feature is documented in Section 6.5 Electrical Characteristics (TSD = 165°C) and Section 7.3.10, protecting against sustained overload or inadequate heatsinking in enclosed industrial environments where LM5017SD/NOPB is commonly deployed.
LM5017SD/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)
LM5017SD/NOPB FAQ
1.How can I place an order for LM5017SD/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5017SD/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 LM5017SD/NOPB reliable?
The price and inventory of LM5017SD/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5017SD/NOPB is usually 5 days.
3.What payment methods are accepted for LM5017SD/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5017SD/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5017SD/NOPB?
LM5017SD/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5017SD/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 LM5017SD/NOPB?
For technical support, including LM5017SD/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5017SD/NOPB requirements.
6.How does Aetrix verify that LM5017SD/NOPB is sourced from the original manufacturer or authorized distributors?
All LM5017SD/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 LM5017SD/NOPB meets industry standards.
7.What is the process for return or replacement of LM5017SD/NOPB?
All LM5017SD/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM5017SD/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 LM5017SD/NOPB part is unused and in its original packaging.
Return procedure for LM5017SD/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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