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Texas Instruments LM25017SDX/NOPB
- Part No.:
- LM25017SDX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
LM25017SDX/NOPB.pdf
- Description:
- IC REG BUCK ADJ 650MA 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:2,757
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Product details
Overview
LM25017SDX/NOPB from Texas Instruments is a 48-V, 650-mA synchronous buck/Fly-Buck™ regulator with integrated 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 delivers isolated bias power in telecom systems and industrial equipment using Fly-Buck topology.
For engineers reviewing the LM25017SDX/NOPB datasheet, LM25017SDX/NOPB pinout, LM25017SDX/NOPB application, or LM25017SDX/NOPB equivalent, key selection criteria include input voltage range (7.5–48 V), adjustable switching frequency up to 1 MHz, intelligent peak current limit (1.02 A), thermal shutdown (165°C), and dual UVLO programming capability.
Technical Context
The LM25017SDX/NOPB implements constant on-time (COT) control where on-time is inversely proportional to VIN via RON resistor, enabling near-constant frequency across input voltage and eliminating need for external loop compensation. Its forced off-time varies with FB voltage and VIN to provide intelligent short-circuit protection.
It integrates a 7.6-V internal VCC regulator with 4.5-V UVLO, bootstrap gate drive with 144-ns minimum off-time for BST capacitor recharge, and synchronous rectification without diode emulation-ensuring continuous conduction mode (CCM) operation even at light loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 7.5 V to 48 V - supports wide industrial and telecom supply rails without pre-regulation. |
| Output Current | 650 mA - maximum continuous load current with integrated MOSFETs; peak current limit at 1.02 A. |
| Feedback Reference | 1.225 V ±2% - sets output voltage via external resistor divider; enables precise regulation down to ~1.23 V. |
| Switching Frequency | Adjustable up to 1 MHz - set by RON and VIN; typical 240 kHz at VIN=48 V, RON=100 kΩ. |
| Thermal Shutdown | 165°C with 20°C hysteresis - disables switch and VCC regulator to prevent damage during overload or poor heatsinking. |
| UVLO Threshold | 1.225 V rising with programmable hysteresis - allows custom input start-up voltage via external resistor divider. |
| Package | WSON-8 (4.0 mm × 4.0 mm) - thermally enhanced exposed-pad package with RθJA = 41.3°C/W. |
Pinout & Package
LM25017SDX/NOPB is housed in an 8-pin WSON package (NGU) with 4.0 mm × 4.0 mm body size and exposed thermal pad soldered to RTN. The pinout supports compact Fly-Buck and buck designs with integrated gate drive and bootstrap functionality.
| 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 7.5–48 V; powers internal VCC regulator and high-voltage circuitry. |
| 3 UVLO | Undervoltage detection input | Programmable start-up threshold (1.225 V) and hysteresis via external resistor divider from VIN. |
| 4 RON | On-time control input | Resistor-to-VIN sets on-time inversely proportional to VIN; ensures stable frequency across input range. |
| 5 FB | Feedback input | Compares output voltage (via resistor divider) to 1.225-V internal reference; regulates output voltage. |
| 6 VCC | Bias supply output | 7.6-V regulated output for internal logic and gate drivers; requires 1.0-μF decoupling capacitor. |
| 7 BST | Bootstrap supply | Connects to SW via 0.01-μF ceramic capacitor; supplies floating gate drive voltage for high-side MOSFET. |
| 8 SW | Switching node | Power switching node connecting to inductor, BST capacitor, and output filter; handles full switching waveform. |
Key Features
| Feature | Design Value |
|---|---|
| Constant On-Time (COT) Control | Eliminates need for external compensation components and enables ultra-fast transient response across wide VIN range. |
| Synchronous Buck + Fly-Buck Capability | Integrated high-side/low-side MOSFETs enable both non-isolated buck and isolated Fly-Buck topologies with single IC. |
| Intelligent Peak Current Limit | Off-time scales with FB voltage and VIN - provides robust short-circuit protection without excessive foldback. |
| Programmable UVLO with Hysteresis | Independent adjustment of turn-on threshold and hysteresis via external resistors - improves system reliability during brownouts. |
| Internal 7.6-V VCC Regulator | Self-biases gate drivers and logic from VIN up to 48 V; can be disabled by external 8.55–13 V supply to reduce dissipation. |
Applications
| Industrial Power Supply | Telecom Isolated Bias |
|---|---|
|
Use Scenario: Regulating 24-V or 48-V backplane to 3.3-V/5-V logic rails in PLCs and motor drives. IC Role / Device Role / Timing Role: Primary synchronous buck controller delivering 650 mA with COT-based fast load-step response. Use Value: Eliminates external compensation and reduces BOM count while maintaining stability across wide input and load variations. |
Use Scenario: Generating isolated 5-V or 12-V auxiliary bias from 48-V telecom line for interface ICs and optocouplers. IC Role / Device Role / Timing Role: Fly-Buck™ converter operating in discontinuous conduction mode with transformer-coupled secondary. Use Value: Achieves galvanic isolation without optocoupler feedback loop - simplifies design and improves reliability over traditional flyback. |
| Smart Meter Auxiliary Rail | Remote Sensor Node Power |
|
Use Scenario: Providing stable 3.3-V supply for metrology ICs and RF modules in AMI smart meters powered from 12–48 V DC lines. IC Role / Device Role / Timing Role: High-efficiency buck regulator with programmable UVLO to tolerate grid voltage sags. Use Value: Maintains operation during brief undervoltage events via hysteresis tuning, ensuring meter data continuity. |
Use Scenario: Powering low-power wireless sensor nodes (LoRaWAN, NB-IoT) from long-life 24-V battery or solar input. IC Role / Device Role / Timing Role: Synchronous buck controller with <225 µA shutdown current and thermal protection. Use Value: Enables multi-year battery life in always-on monitoring applications while preventing thermal runaway in sealed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5164QDDARQ1 | 42-V max input, 300-mA output, integrated 100-V bootstrap diode; requires external compensation. | Automotive AEC-Q100 qualified; suited for harsh environments but lower current rating. | Select when automotive qualification and higher input surge tolerance are required over raw output current. |
| TPS54240DGQR | 42-V max input, 2.5-A output, voltage-mode control with full compensation network; no Fly-Buck support. | Higher current delivery and wider temperature range (–40°C to 150°C), but larger solution size. | Select when >650 mA load current is needed and isolation is not required. |
Compared with LM25017SDX/NOPB, LM5164QDDARQ1 offers automotive-grade reliability at lower current and added surge protection, while TPS54240DGQR delivers higher output current with conventional voltage-mode control-making LM25017SDX/NOPB optimal for space-constrained Fly-Buck or industrial 650-mA applications requiring zero-compensation design.
Availability
LM25017SDX/NOPB is available at Aetrix Electronics and suitable for industrial equipment, smart power meters, and telecom isolated bias supply applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LM25017SDX/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 designing analog and embedded processing chips for industrial, automotive, and communications markets.
The LM25017 product line delivers high-voltage synchronous buck regulators optimized for Fly-Buck™ isolated power and wide-input industrial supplies - emphasizing simplicity, reliability, and minimal external component count.
FAQ
What is the maximum input voltage supported by the LM25017SDX/NOPB?
The LM25017SDX/NOPB supports a maximum input voltage of 48 V under recommended operating conditions. Absolute maximum rating is 53 V, but sustained operation above 48 V risks reliability degradation. The internal VCC regulator and gate drivers are designed for safe operation up to 48 V, with thermal derating required at high VIN and high-frequency switching.
Does the LM25017SDX/NOPB support Fly-Buck™ topology out of the box?
Yes, the LM25017SDX/NOPB natively supports Fly-Buck™ operation without additional ICs. Its integrated synchronous switches, constant on-time control, and ability to regulate based on primary-side feedback enable isolated output generation using a coupled inductor. TI provides validated reference designs and WEBENCH® support specifically for Fly-Buck configurations using LM25017SDX/NOPB.
What is the purpose of the RON pin on the LM25017SDX/NOPB?
The RON pin on the LM25017SDX/NOPB sets the switch on-time via an external resistor connected to VIN. On-time is calculated as TON = (10−10 × RON) / VIN, making it inversely proportional to input voltage. This mechanism maintains nearly constant switching frequency across the 7.5–48 V input range and eliminates need for loop compensation.
Can the LM25017SDX/NOPB operate without an external bootstrap capacitor?
No, the LM25017SDX/NOPB requires a 0.01-μF ceramic capacitor between BST and SW pins. This capacitor supplies gate drive voltage to the high-side MOSFET during its on-time. Without it, the high-side switch cannot turn on properly, causing failure to regulate. The internal diode recharges the capacitor during SW low-time, relying on ≥144 ns minimum off-time for reliable operation.
How does the LM25017SDX/NOPB handle thermal overload conditions?
The LM25017SDX/NOPB includes a dedicated thermal shutdown circuit that triggers at 165°C junction temperature, disabling both the buck switch and internal VCC regulator. Recovery occurs automatically when junction temperature falls below 145°C (20°C hysteresis). This protects against catastrophic failure during sustained overload, poor PCB layout, or ambient temperature excursions - a critical safeguard in enclosed industrial enclosures.
LM25017SDX/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):
- 48V
- Voltage - Output (Min/Fixed):
- 1.225V
- Voltage - Output (Max):
- 40V
- Current - Output:
- 650mA
- Frequency - Switching:
- Up to 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-WSON (4x4)
LM25017SDX/NOPB FAQ
1.How can I place an order for LM25017SDX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM25017SDX/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 LM25017SDX/NOPB reliable?
The price and inventory of LM25017SDX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM25017SDX/NOPB is usually 5 days.
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LM25017SDX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM25017SDX/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 LM25017SDX/NOPB?
For technical support, including LM25017SDX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM25017SDX/NOPB requirements.
6.How does Aetrix verify that LM25017SDX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM25017SDX/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 LM25017SDX/NOPB meets industry standards.
7.What is the process for return or replacement of LM25017SDX/NOPB?
All LM25017SDX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM25017SDX/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 LM25017SDX/NOPB part is unused and in its original packaging.
Return procedure for LM25017SDX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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