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Texas Instruments LM25017MRX/NOPB
- Part No.:
- LM25017MRX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM25017MRX/NOPB.pdf
- Description:
- IC REG BUCK ADJ 650MA 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:4,212
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Product details
Overview
LM25017MRX/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 1.225-V ±2% feedback reference. It operates across 7.5–48 V input and delivers regulated output in industrial power supplies and isolated bias applications.
For engineers reviewing the LM25017MRX/NOPB datasheet, LM25017MRX/NOPB pinout, LM25017MRX/NOPB application, or LM25017MRX/NOPB equivalent, key selection criteria include its COT architecture enabling ultra-fast transient response, programmable UVLO and on-time via external resistors, thermal shutdown at 165°C, and dual-package availability (HSOP-8/WSON-8) for layout flexibility in space-constrained designs.
Technical Context
The LM25017MRX/NOPB implements constant on-time control where on-time is inversely proportional to VIN and set by RON, yielding nearly constant switching frequency across input voltage variations. Its internal 7.6-V VCC regulator powers gate drivers and logic, with UVLO hysteresis enabled via external resistor divider on the UVLO pin.
It features intelligent peak current limiting with VIN- and FB-dependent off-time (144 ns minimum), overvoltage protection triggered at 1.62 V on FB, and synchronous rectification that maintains continuous conduction mode (CCM) even at light loads-no diode emulation or forced discontinuous mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 7.5 V to 48 V - supports wide industrial and telecom rails without pre-regulation |
| Output Current | 650 mA - continuous load capability with integrated MOSFETs, no external Schottky needed |
| Feedback Reference | 1.225 V ±2% - sets precise output voltage via RFB1/RFB2 divider; enables 1.225 V minimum VOUT |
| Switching Frequency | Adjustable up to 1 MHz - set by RON and VIN; typical 200–300 kHz at 12–24 V input |
| Current Limit Threshold | 1.02 A (typ) - peak-limited protection with VIN- and FB-dependent off-time for safe short-circuit handling |
| Thermal Shutdown | 165°C activation with 20°C hysteresis - disables switch and VCC regulator to prevent damage |
| UVLO Threshold | 1.225 V rising with 110 mV hysteresis - programmable start-up voltage using external resistor divider |
Pinout & Package
LM25017MRX/NOPB is available in HSOP-8 (4.89 mm × 3.90 mm) and WSON-8 (4.00 mm × 4.00 mm) thermally enhanced packages, both featuring exposed thermal pads soldered to RTN for improved heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 RTN | Ground reference | System ground connection; exposed pad must be soldered to PCB ground plane |
| 2 VIN | Main power input | Supplies 7.5–48 V; powers internal VCC regulator and high-voltage circuitry |
| 3 UVLO | Undervoltage detection input | Resistor divider from VIN sets startup threshold; <0.66 V forces shutdown |
| 4 RON | On-time programming | Resistor to VIN sets COT on-time; minimum 100 ns at max VIN ensures stable operation |
| 5 FB | Feedback input | Compares against 1.225 V reference; requires ≥25 mV ripple for stable COT regulation |
| 6 VCC | Bias supply output | 7.6 V regulated output for gate drivers; requires 1.0-μF decoupling capacitor |
| 7 BST | Bootstrap supply | Connects to SW via 0.01-μF ceramic capacitor; charged by VCC through internal diode |
| 8 SW | Switching node | Drives external inductor; connects to BST capacitor and output filter network |
Key Features
| Feature | Design Value |
|---|---|
| Constant On-Time (COT) Control | Eliminates need for external compensation components and enables sub-100 ns transient response |
| Integrated Dual MOSFETs | 650-mA rated high-side and synchronous low-side N-channel switches reduce BOM count and board area |
| No External Schottky Diode | Synchronous rectification improves efficiency >90% at mid-load and eliminates reverse recovery losses |
| Programmable UVLO & On-Time | Independent resistor-based configuration of startup voltage and operating frequency without changing IC |
| Fly-Buck™ Capability | Enables isolated auxiliary outputs using coupled inductors-no optocoupler or secondary controller needed |
Applications
| Industrial Power Supply | Smart Meter Bias Rail |
|---|---|
Use Scenario: Regulating 24-V or 48-V field bus to 3.3-V/5-V logic rails in PLC I/O modules and motor drives. IC Role / Device Role / Timing Role: Primary non-isolated buck converter delivering stable, efficient DC-DC conversion with fast load-step response. Use Value: Integrated MOSFETs and COT control reduce component count and improve dynamic performance under varying load conditions. | Use Scenario: Generating isolated 12-V or 15-V auxiliary supply from 220-VAC-derived 48-V intermediate rail in smart electricity meters. IC Role / Device Role / Timing Role: Fly-Buck™ topology implementation providing galvanically isolated bias without transformer feedback winding or optocoupler. Use Value: Eliminates secondary-side regulation complexity while maintaining tight output tolerance via primary-side COT control. |
| Telecom Line Card | Isolated Sensor Interface |
Use Scenario: Point-of-load conversion in 48-V telecom line cards requiring compact, reliable 5-V or 12-V rails for FPGAs and transceivers. IC Role / Device Role / Timing Role: High-input-voltage buck regulator with thermal shutdown and UVLO ensuring robust operation in dense, ventilated enclosures. Use Value: 165°C thermal shutdown and 48-V absolute max rating enable safe deployment in unregulated telecom environments. | Use Scenario: Providing isolated 3.3-V supply for analog front-end sensors in industrial IoT nodes with high common-mode noise. IC Role / Device Role / Timing Role: Fly-Buck™ converter generating floating bias for isolated ADCs or signal conditioners without secondary regulation. Use Value: Maintains ±2% output accuracy across temperature and load while minimizing EMI via fixed-frequency COT behavior. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5164RQNT | 42-V max input, 300-mA output, integrated bootstrap diode, lower current rating | Not suitable for 650-mA loads or Fly-Buck™ isolation; optimized for ultra-low IQ in battery-fed systems | Select when input ≤42 V and load <300 mA; not drop-in for LM25017MRX/NOPB |
| TPS54340DDAR | 42-V max input, 3.5-A output, voltage-mode control with compensation, larger solution size | Requires external compensation and Schottky diode; higher current but no Fly-Buck™ support | Choose for higher output current needs where COT is not required and board space allows larger magnetics |
Compared with LM5164RQNT and TPS54340DDAR, LM25017MRX/NOPB uniquely combines 48-V input capability, 650-mA integrated power stage, Fly-Buck™ isolation support, and zero-compensation COT control-making it optimal for compact, high-efficiency industrial and metering designs where input voltage exceeds 42 V.
Availability
LM25017MRX/NOPB is available at Aetrix Electronics and suitable for industrial equipment, smart power meters, and telecommunication systems requiring stable component supply, long-term manufacturability, and automotive-grade reliability screening.
Supply support for LM25017MRX/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, embedded processing, and connectivity solutions for industrial, automotive, and communications markets.
The LM25017MRX/NOPB belongs to TI's high-voltage DC-DC regulator product line, engineered specifically for ruggedized industrial and utility-grade applications demanding wide input range, integrated power stages, and isolation-capable topologies.
FAQ
What is the maximum input voltage rating for LM25017MRX/NOPB?
The LM25017MRX/NOPB has an absolute maximum input voltage rating of 53 V, with recommended operating range from 7.5 V to 48 V. Operation above 48 V is outside specification and may compromise reliability or trigger overvoltage stress. The device integrates protection features including SW-to-RTN transient rating of VIN +0.3 V (100 ns), ensuring robustness in noisy industrial environments where voltage spikes occur.
Does LM25017MRX/NOPB support Fly-Buck™ topology out of the box?
Yes, LM25017MRX/NOPB natively supports Fly-Buck™ operation without firmware or external controllers. Its constant on-time control, integrated synchronous rectifier, and ability to regulate based on primary-side feedback enable isolated auxiliary outputs using a coupled inductor. Designers implement this by connecting the secondary winding to a rectifier and capacitor-no optocoupler, secondary-side IC, or feedback winding is required, simplifying isolated bias generation.
What is the purpose of the RON pin on LM25017MRX/NOPB?
The RON pin on LM25017MRX/NOPB sets the constant on-time duration via an external resistor to VIN. This resistor determines switching frequency-higher RON yields longer on-times and lower frequency. The on-time is inversely proportional to VIN, enabling near-constant frequency across input voltage changes. Minimum on-time must exceed 100 ns at maximum VIN (48 V) to ensure reliable gate drive timing and stable regulation.
Can LM25017MRX/NOPB operate without an external bootstrap capacitor?
No, LM25017MRX/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. During the off-time, the capacitor recharges from the internal VCC regulator (7.6 V) through an integrated diode. Omitting this capacitor prevents proper high-side switching, causing failure to regulate or immediate thermal shutdown due to shoot-through risk.
How does the current limit function in LM25017MRX/NOPB differ from standard cycle-by-cycle limiting?
LM25017MRX/NOPB uses intelligent peak current limiting with a VIN- and FB-dependent off-time timer-not simple cycle-by-cycle reset. When current exceeds 1.02 A, the switch turns off immediately and initiates a non-resettable off-period calculated as TOFF(ILIM) = (0.07 × VIN) / (VFB + 0.2 V). At VFB = 0 V (e.g., short circuit), off-time reaches ~16 μs at 48 V; at higher VFB (light overload), off-time shortens-reducing fold-back and improving recovery. This preserves regulation stability under partial faults.
LM25017MRX/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):
- 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-SO PowerPad
LM25017MRX/NOPB FAQ
1.How can I place an order for LM25017MRX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM25017MRX/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 LM25017MRX/NOPB reliable?
The price and inventory of LM25017MRX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM25017MRX/NOPB is usually 5 days.
3.What payment methods are accepted for LM25017MRX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM25017MRX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM25017MRX/NOPB?
LM25017MRX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM25017MRX/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 LM25017MRX/NOPB?
For technical support, including LM25017MRX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM25017MRX/NOPB requirements.
6.How does Aetrix verify that LM25017MRX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM25017MRX/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 LM25017MRX/NOPB meets industry standards.
7.What is the process for return or replacement of LM25017MRX/NOPB?
All LM25017MRX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM25017MRX/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 LM25017MRX/NOPB part is unused and in its original packaging.
Return procedure for LM25017MRX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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