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Texas Instruments LM25018SDE/NOPB
- Part No.:
- LM25018SDE/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
LM25018SDE/NOPB.pdf
- Description:
- IC REG BUCK ADJ 325MA 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:135
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Product details
Overview
LM25018SDE/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, 7.5–48 V input range, and 1.225 V ±2% feedback reference - used in isolated bias supplies and industrial power rails.
For engineers reviewing the LM25018SDE/NOPB datasheet, LM25018SDE/NOPB pinout, LM25018SDE/NOPB application, or LM25018SDE/NOPB equivalent, key selection criteria include COT-based transient response, programmable UVLO threshold, bootstrap gate drive architecture, and dual-package availability (WSON-8/SO PowerPAD-8) for thermal optimization.
Technical Context
The LM25018SDE/NOPB implements constant on-time control with VIN-inversely proportional on-time (via RON resistor), eliminating loop compensation while enabling ultra-fast load transient response and near-constant switching frequency across 7.5–48 V input. Its intelligent peak current limit uses FB-voltage–dependent off-time to reduce foldback during partial overloads.
It integrates a 7.6-V internal VCC regulator with 4.5-V UVLO, bootstrap charging via internal diode from VCC to BST, and dual-level UVLO (0.66 V shutdown / 1.225 V enable) with external hysteresis programming. Thermal shutdown activates at 165°C with 20°C hysteresis.
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 external pre-regulation. |
| Output Current | 325 mA - continuous output capability enabled by integrated synchronous MOSFETs (RDS(ON) HS: 0.8–1.8 Ω, LS: 0.45–1 Ω). |
| Feedback Reference | 1.225 V ±2% - sets precise output voltage via external resistor divider (e.g., 10 V out = RFB2/RFB1 ≈ 7.18). |
| Switching Control | Constant on-time (COT) - no compensation required; frequency adjustable up to 1 MHz via RON resistor. |
| Protection Features | Intelligent peak current limit (390–750 mA), thermal shutdown (165°C), UVLO (programmable), remote shutdown (UVLO < 0.66 V). |
| Package Options | WSON-8 (4.0 × 4.0 mm) and SO PowerPAD-8 (4.89 × 3.90 mm) - both expose pad for low θJC (2.4–3.2 °C/W) thermal path. |
Pinout & Package
LM25018SDE/NOPB is packaged in an 8-pin WSON (4.00 mm × 4.00 mm) with exposed thermal pad, requiring solder connection to RTN for optimal thermal performance (θJC(bot) = 3.2 °C/W). Pin functions are validated per TI SNVS953G Rev G.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 RTN | Ground reference | System ground return for all internal circuits; exposed pad must be soldered to RTN plane. |
| 2 VIN | Main input supply | Accepts 7.5–48 V; powers internal VCC regulator and high-voltage gate drivers. |
| 3 UVLO | Undervoltage lockout input | External resistor divider sets startup threshold (1.225 V) and hysteresis; pulled <0.66 V enables shutdown. |
| 4 RON | On-time programming | Resistor to VIN sets minimum on-time (e.g., 100 kΩ → ~250 ns at 48 V); determines operating frequency. |
| 5 FB | Feedback input | Compares output voltage (via resistor divider) to 1.225 V reference; ripple ≥25 mV required for stable COT operation. |
| 6 VCC | Bias supply output | 7.6 V regulated output (6.25–8.55 V) powers gate drivers; UVLO at 4.5 V enables IC operation. |
| 7 BST | Bootstrap supply | Charged from VCC through internal diode when SW is low; requires 0.01 µF ceramic capacitor to SW. |
| 8 SW | Switching node | Drives external inductor; connects to BST capacitor and internal high-side/low-side MOSFETs. |
Key Features
| Feature | Design Value |
|---|---|
| No external Schottky diode needed | Synchronous rectification eliminates conduction loss and heat generation in low-side path. |
| No loop compensation required | COT architecture simplifies design, reduces BOM count, and avoids stability tuning across line/load conditions. |
| Ultra-fast transient response | On-time retriggering on FB dip enables sub-microsecond recovery from load steps without overshoot. |
| Programmable undervoltage lockout | Independent threshold (1.225 V) and hysteresis set via external resistors - prevents brownout oscillation. |
| Fly-Buck™ topology support | Integrated synchronous switch and COT control enable isolated auxiliary outputs without optocoupler or transformer feedback. |
Applications
| Industrial Power Rails | Smart Meter Bias Supply |
|---|---|
|
Use Scenario: Regulating 24 V or 48 V field bus down to 3.3 V or 5 V for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Primary synchronous buck controller delivering stable, low-noise DC power with fast transient immunity. Use Value: Eliminates need for external gate drivers or compensation networks, reducing layout complexity and validation time. |
Use Scenario: Generating isolated 5 V or 12 V auxiliary supply from 220 VAC-derived 48 V rail in smart electricity meters. IC Role / Device Role / Timing Role: Fly-Buck™ converter core providing galvanically isolated bias without optocoupler or secondary-side regulation. Use Value: Achieves <1% output regulation drift across temperature using only primary-side feedback and COT timing stability. |
| Telecom Line Card Supply | Isolated Gate Driver Bias |
|
Use Scenario: Point-of-load conversion in telecom line cards where input varies from 36 V to 48 V under battery backup conditions. IC Role / Device Role / Timing Role: Constant-frequency buck regulator maintaining 240–450 kHz operation across full input range via RON scaling. Use Value: Near-constant frequency simplifies EMI filter design and avoids audible noise in sensitive communication equipment. |
Use Scenario: Providing isolated +12 V/-5 V bias for SiC or GaN half-bridge gate drivers in motor drives and inverters. IC Role / Device Role / Timing Role: Fly-Buck™ secondary-side synchronous rectifier delivering tightly regulated, low-ripple bias with minimal component count. Use Value: Bootstrap-capable architecture enables self-sustaining gate drive supply without auxiliary windings or LDO post-regulation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5164SDE/NOPB | Higher 100-V input rating, 600-mA output, and integrated soft-start; uses current-mode control instead of COT. | Better suited for 48 V+ industrial systems with higher load demands and stricter start-up sequencing. | Select when input exceeds 48 V or >325 mA output is required; trade-off is added compensation complexity. |
| TPS54240DGQR | 42-V input, 2.5-A output, current-mode control with internal compensation; no integrated low-side FET. | Requires external low-side MOSFET and compensation network; optimized for high-current, non-isolated buck. | Choose for cost-sensitive, high-output-current designs where Fly-Buck™ isolation is not needed. |
Compared with LM25018SDE/NOPB, LM5164SDE/NOPB offers higher voltage headroom and current capacity but sacrifices COT's zero-compensation advantage; TPS54240DGQR delivers higher current but increases BOM count and design effort due to external FET and compensation.
Availability
LM25018SDE/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 RoHS-compliant packaging.
Supply support for LM25018SDE/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 LM25018SDE/NOPB belongs to TI's high-voltage synchronous buck regulator product line, designed specifically for efficient, compact, and isolated DC-DC conversion in industrial and telecom infrastructure.
FAQ
What is the maximum input voltage rating for the LM25018SDE/NOPB?
The LM25018SDE/NOPB has an absolute maximum input voltage (VIN to RTN) of 53 V, with recommended operating range from 7.5 V to 48 V. Exceeding 48 V continuously risks thermal overload due to increased VCC regulator dissipation, especially at high switching frequencies.
Does the LM25018SDE/NOPB require external compensation components?
No, the LM25018SDE/NOPB uses constant on-time (COT) control, which eliminates the need for external compensation networks. Stability is inherently maintained across line and load variations, simplifying design and reducing bill-of-materials count compared to current-mode or voltage-mode controllers.
Can the LM25018SDE/NOPB be used in Fly-Buck™ isolated configurations?
Yes, the LM25018SDE/NOPB is explicitly qualified for Fly-Buck™ operation. Its integrated synchronous rectifier, COT control, and robust UVLO/thermal protection enable reliable isolated auxiliary outputs without optocouplers or secondary-side feedback, as confirmed in TI's SNVS953G datasheet Figure 8-2.
What is the purpose of the RON pin on the LM25018SDE/NOPB?
The RON pin on the LM25018SDE/NOPB sets the minimum on-time via an external resistor to VIN, directly determining switching frequency. For example, a 100-kΩ resistor yields ~250 ns on-time at 48 V input, resulting in ~240 kHz operation - enabling frequency adjustment without changing inductor or capacitor values.
How does the LM25018SDE/NOPB handle short-circuit protection?
The LM25018SDE/NOPB implements intelligent peak current limiting: if inductor current exceeds 575 mA (typ), the on-time terminates immediately and a FB-dependent off-time timer activates - up to 16 µs at FB = 0 V and VIN = 48 V - ensuring safe short-circuit operation without latch-off or external circuitry.
LM25018SDE/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:
- 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-WSON (4x4)
LM25018SDE/NOPB FAQ
1.How can I place an order for LM25018SDE/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM25018SDE/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 LM25018SDE/NOPB reliable?
The price and inventory of LM25018SDE/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM25018SDE/NOPB is usually 5 days.
3.What payment methods are accepted for LM25018SDE/NOPB?
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Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM25018SDE/NOPB?
LM25018SDE/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM25018SDE/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 LM25018SDE/NOPB?
For technical support, including LM25018SDE/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM25018SDE/NOPB requirements.
6.How does Aetrix verify that LM25018SDE/NOPB is sourced from the original manufacturer or authorized distributors?
All LM25018SDE/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 LM25018SDE/NOPB meets industry standards.
7.What is the process for return or replacement of LM25018SDE/NOPB?
All LM25018SDE/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM25018SDE/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 LM25018SDE/NOPB part is unused and in its original packaging.
Return procedure for LM25018SDE/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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