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Texas Instruments LM25018MRE/NOPB
- Part No.:
- LM25018MRE/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM25018MRE/NOPB.pdf
- Description:
- IC REG BUCK ADJ 325MA 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:2,104
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Product details
Overview
LM25018MRE/NOPB from Texas Instruments is a 48-V, 325-mA synchronous buck/Fly-Buck™ regulator with integrated high-side and low-side N-channel MOSFETs, constant on-time (COT) control, 1.225-V precision feedback reference, and 7.5–48-V input range. It delivers regulated DC output in industrial power supplies and isolated bias rails without requiring external Schottky diodes or loop compensation.
For engineers reviewing the LM25018MRE/NOPB datasheet, LM25018MRE/NOPB pinout, LM25018MRE/NOPB application, or LM25018MRE/NOPB equivalent, key selection criteria include its COT architecture enabling ultra-fast transient response, programmable on-time via RON, intelligent peak current limit (575 mA typ), thermal shutdown at 165°C, and dual-package availability in SO PowerPAD-8 and WSON-8.
Technical Context
The LM25018MRE/NOPB implements a constant on-time (COT) control scheme where on-time varies inversely with VIN to maintain nearly constant switching frequency across 7.5–48 V input; off-time is determined by FB voltage falling below 1.225 V, with minimum forced off-time of 144 ns for bootstrap capacitor recharge.
It integrates a 7.6-V internal VCC regulator (current-limited to 26 mA) powering gate drivers and logic, a dual-level UVLO circuit (1.225 V threshold with 20 µA hysteresis current source), and an intelligent current-limit off-timer whose duration scales with VIN and inversely with FB voltage - ensuring robust short-circuit protection while minimizing foldback during moderate overloads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 7.5 V to 48 V - supports wide industrial and telecom input rails without pre-regulation |
| Output Current | 325 mA - maximum continuous load capability with integrated synchronous switches |
| Feedback Reference | 1.225 V ±2% - enables precise output voltage setting via external resistor divider |
| Switching Frequency | Adjustable up to 1 MHz - set via RON; near-constant frequency over input range due to VIN-inversely proportional on-time |
| Current Limit Threshold | 575 mA typical - peak-limited protection with adaptive off-time scaling for fast short-circuit response |
| Thermal Shutdown | 165°C with 20°C hysteresis - prevents catastrophic failure and enables automatic recovery at 145°C |
| UVLO Threshold | 1.225 V rising with programmable hysteresis - allows custom input undervoltage lockout using external resistor divider |
Pinout & Package
LM25018MRE/NOPB is packaged in SO PowerPAD-8 (4.89 mm × 3.90 mm) with exposed thermal pad soldered to RTN for enhanced thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RTN (Pin 1) | Ground reference | System ground connection; exposed pad must be soldered to PCB ground plane for thermal management |
| VIN (Pin 2) | Main power input | Accepts 7.5–48 V; powers internal VCC regulator and high-voltage startup circuit |
| UVLO (Pin 3) | Undervoltage detection input | Enables programmable input UVLO threshold and hysteresis via external resistor divider from VIN |
| RON (Pin 4) | On-time programming | Resistor between RON and VIN sets on-time inversely proportional to VIN; min 100 ns required at max VIN |
| FB (Pin 5) | Feedback input | Compares output voltage (via resistor divider) to 1.225-V internal reference; regulates output |
| VCC (Pin 6) | Bias supply output | 7.6-V regulated output powering gate drivers and internal logic; requires 1-μF decoupling capacitor |
| BST (Pin 7) | Bootstrap supply | Connects to SW via 0.01-μF ceramic capacitor; charged by VCC through internal diode during SW low phase |
| SW (Pin 8) | Power switching node | Drives external inductor; connects to BST capacitor and output filter; handles high dv/dt transitions |
Key Features
| Feature | Design Value |
|---|---|
| No loop compensation required | COT architecture eliminates need for external compensation network - simplifies design and reduces BOM count |
| No external Schottky diode needed | Integrated synchronous rectifier replaces lossy diode - improves efficiency and eliminates diode thermal management |
| Ultra-fast transient response | On-time triggered directly by FB voltage crossing 1.225 V - enables sub-microsecond load step recovery |
| Intelligent peak current limit | Off-time scales with VIN and inversely with FB voltage - provides strong short-circuit protection while minimizing foldback during partial overloads |
| Adjustable undervoltage lockout | UVLO pin accepts resistor divider from VIN - allows precise system-level brown-out protection without additional ICs |
Applications
| Industrial Power Supply | Smart Meter Bias Rail |
|---|---|
Use Scenario: Regulating 24-V or 48-V field bus to 3.3-V or 5-V logic supply in PLC I/O modules or motor drives. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator delivering stable, efficient DC power to microcontrollers and sensors. Use Value: Integrated MOSFETs and COT control enable compact, high-efficiency design with minimal external components and no compensation tuning. | Use Scenario: Generating isolated 12-V or 15-V auxiliary supply from 24-V meter main rail for metrology ADC and communication ICs. IC Role / Device Role / Timing Role: Fly-Buck™ topology implementation providing galvanically isolated output without optocoupler or transformer feedback winding. Use Value: Uses same COT control and internal switches as buck mode - eliminates need for secondary-side regulation circuitry and reduces bill-of-materials. |
| Telecom Line Card | Isolated Gate Driver Supply |
Use Scenario: Converting -48-V telecom battery backup to +5-V or +12-V for FPGA configuration and interface ICs. IC Role / Device Role / Timing Role: High-input-voltage buck converter operating reliably across full -48-V nominal range with ripple tolerance. Use Value: 48-V rating and 7.5-V minimum input support operation down to ~-36-V (after rectification), meeting telecom brown-out requirements. | Use Scenario: Providing isolated +15-V/-10-V gate drive supply for SiC or IGBT half-bridge drivers in inverters and UPS systems. IC Role / Device Role / Timing Role: Fly-Buck™ converter generating dual-polarity isolated rails from a single primary-side winding. Use Value: Eliminates need for separate isolated DC/DC modules - reduces footprint and cost while maintaining tight regulation via primary-side COT control. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5164MRE/NOPB | Higher 100-V input rating, 600-mA output, different COT implementation with valley-current sensing | Better suited for 48-V PoE, solar, or automotive applications requiring wider VIN margin | Select when input may exceed 48 V or higher output current is required; not pin-compatible |
| TPS54202DRCT | Lower 6-V max input, 2-A output, voltage-mode PWM with internal compensation | Targeted at low-voltage DC/DC conversion (e.g., 5-V or 12-V input rails), not high-voltage industrial use | Choose only for sub-6-V input designs; incompatible with 24/48-V systems handled by LM25018MRE/NOPB |
Compared with LM5164MRE/NOPB and TPS54202DRCT, the LM25018MRE/NOPB uniquely balances 48-V input capability, integrated synchronous FETs, and COT simplicity for cost-sensitive industrial and Fly-Buck™ isolation - offering optimal trade-offs in size, efficiency, and design effort for mid-power 7.5–48-V applications.
Availability
LM25018MRE/NOPB is available at Aetrix Electronics and suitable for industrial equipment, smart power meters, and telecommunication systems requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LM25018MRE/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 digital signal processing technologies for industrial, automotive, and communications markets.
The LM25018MRE/NOPB belongs to TI's high-voltage DC/DC regulator product line, engineered specifically for reliable, compact, and efficient power conversion in 24-V and 48-V industrial and telecom infrastructure applications.
FAQ
What is the maximum input voltage rating for LM25018MRE/NOPB?
The LM25018MRE/NOPB has an absolute maximum input voltage rating of 53 V and a recommended operating input voltage range of 7.5 V to 48 V. Operation above 48 V is outside specification and risks exceeding thermal limits or violating safe operating area margins, especially under high ambient temperature or heavy load conditions. The device's internal VCC regulator and gate drivers are optimized for this 48-V ceiling.
Does LM25018MRE/NOPB require external compensation components?
No, the LM25018MRE/NOPB does not require external compensation components. Its constant on-time (COT) control architecture eliminates the need for traditional Type II or Type III compensation networks. Stability is inherently maintained through the direct relationship between FB voltage crossing and on-time triggering, enabling faster transient response and simpler layout - a core design advantage confirmed in TI's SNVS953G datasheet Section 7.3.1.
Can LM25018MRE/NOPB be used in Fly-Buck™ topology?
Yes, LM25018MRE/NOPB is explicitly qualified for Fly-Buck™ operation, as stated in its official title and Section 2 Applications. In Fly-Buck™ mode, it generates isolated output voltage using a coupled inductor without secondary-side feedback. The COT control and integrated synchronous switches ensure stable regulation on the primary side, eliminating the need for optocouplers or secondary-side controllers - a capability validated in TI application notes and reference designs.
What is the purpose of the RON pin on LM25018MRE/NOPB?
On the LM25018MRE/NOPB, the RON pin sets the switch on-time via an external resistor connected to VIN. The on-time is calculated as TON = (10−10 × RON) / VIN, making it inversely proportional to input voltage - a key mechanism enabling nearly constant switching frequency across the 7.5–48-V input range. Minimum on-time must exceed 100 ns at maximum VIN to ensure proper gate driver timing and bootstrap capacitor recharge.
How does thermal shutdown work in LM25018MRE/NOPB?
The LM25018MRE/NOPB features thermal shutdown that activates at a typical junction temperature of 165°C, disabling both the buck switch and internal VCC regulator to prevent damage. Hysteresis is 20°C, so normal operation resumes only after junction temperature falls below ~145°C. This behavior is documented in Section 6.5 Electrical Characteristics and Section 7.3.10 of the SNVS953G datasheet, and applies regardless of package variant (SO PowerPAD-8 or WSON-8).
LM25018MRE/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:
- 325mA
- 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
LM25018MRE/NOPB FAQ
1.How can I place an order for LM25018MRE/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM25018MRE/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 LM25018MRE/NOPB reliable?
The price and inventory of LM25018MRE/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM25018MRE/NOPB is usually 5 days.
3.What payment methods are accepted for LM25018MRE/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM25018MRE/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM25018MRE/NOPB?
LM25018MRE/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM25018MRE/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 LM25018MRE/NOPB?
For technical support, including LM25018MRE/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM25018MRE/NOPB requirements.
6.How does Aetrix verify that LM25018MRE/NOPB is sourced from the original manufacturer or authorized distributors?
All LM25018MRE/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 LM25018MRE/NOPB meets industry standards.
7.What is the process for return or replacement of LM25018MRE/NOPB?
All LM25018MRE/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM25018MRE/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 LM25018MRE/NOPB part is unused and in its original packaging.
Return procedure for LM25018MRE/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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