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Texas Instruments LM5018MR/NOPB
- Part No.:
- LM5018MR/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM5018MR/NOPB.pdf
- Description:
- IC REG BUCK ADJ 300MA 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:2,345
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Product details
Overview
LM5018MR/NOPB from Texas Instruments is a 100-V, 300-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 operation across 7.5–100 V input range. It delivers isolated bias power in telecom systems and automotive electronics without requiring an external Schottky diode.
For engineers reviewing the LM5018MR/NOPB datasheet, LM5018MR/NOPB pinout, LM5018MR/NOPB application, or LM5018MR/NOPB equivalent, key selection considerations include its COT architecture eliminating loop compensation, adjustable 100 ns–4.4 µs on-time via RON resistor, thermal shutdown at 165°C, and dual-package availability (SO PowerPAD-8 and WSON-8).
Technical Context
The LM5018MR/NOPB implements a constant-on-time control scheme where on-time varies inversely with VIN to maintain nearly constant switching frequency across input voltage changes. Its internal 7.6-V VCC regulator powers gate drivers and logic, while the BST-SW bootstrap circuit sustains high-side drive using a 0.01-µF ceramic capacitor.
Feedback regulation uses a 1.225-V internal reference with overvoltage protection at 1.62 V; current limiting employs intelligent off-time scaling based on FB voltage and VIN, enabling fast short-circuit response (150 ns) and reduced foldback during partial overloads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 7.5 V to 100 V - supports direct connection to 48-V telecom buses and automotive battery rails without pre-regulation. |
| Output Current | 300 mA continuous - sufficient for isolated auxiliary supplies and low-power system rails. |
| Feedback Reference | 1.225 V ±2% - enables precise output voltage setting via external resistor divider (e.g., 3.3 V, 5 V, 12 V). |
| Switching Frequency | Adjustable up to 1 MHz - set by RON and VIN; typical operation near 240 kHz at 24 V input ensures EMI manageability. |
| Current Limit Threshold | 390–750 mA peak - provides robust overload protection with adaptive off-time scaling for faster recovery under partial faults. |
| Thermal Shutdown | 165°C with 20°C hysteresis - prevents permanent damage during sustained overloads or poor PCB thermal design. |
| VCC Regulator Output | 7.6 V ±1.3 V - powers internal logic and gate drivers; externally bypassed with 1.0-µF ceramic capacitor. |
Pinout & Package
LM5018MR/NOPB is packaged in SO PowerPAD-8 (4.89 mm × 3.90 mm), featuring an exposed thermal pad electrically connected to RTN for enhanced heat dissipation. The package supports high-voltage isolation and efficient thermal transfer to PCB ground planes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 RTN | Ground reference | Primary GND return path; exposed pad must be soldered to system ground plane for thermal and electrical integrity. |
| 2 VIN | Main input supply | Accepts 7.5–100 V DC; powers internal VCC regulator and high-voltage startup circuitry. |
| 3 UVLO | Undervoltage lockout input | Resistor-divider programmable threshold (1.225 V trip); enables remote shutdown when pulled below 0.66 V. |
| 4 RON | On-time programming | Resistor-to-VIN sets minimum on-time (e.g., 100 kΩ yields ~250 ns at 48 V), determining operating frequency. |
| 5 FB | Feedback input | Compares output voltage against 1.225-V internal reference; requires ≥25 mV ripple for stable COT operation. |
| 6 VCC | Bias supply output | 7.6-V regulated output for internal circuits; requires 1.0-µF decoupling; disabled if externally driven >8.55 V. |
| 7 BST | Bootstrap supply | Charged via internal diode from VCC during SW low phase; drives high-side gate with external 0.01-µF BST–SW capacitor. |
| 8 SW | Power switching node | Connects to inductor and BST capacitor; carries full switching current; voltage swings from RTN to VIN. |
Key Features
| Feature | Design Value |
|---|---|
| No loop compensation required | Constant-on-time control eliminates external compensation network, reducing BOM count and layout sensitivity. |
| No external Schottky diode needed | Integrated synchronous rectifier replaces lossy diode, improving efficiency by ~3–5% at light loads. |
| Fly-Buck™ topology support | Enables isolated output generation without optocoupler or transformer auxiliary windings-ideal for bias supplies in gate drivers. |
| Ultra-fast transient response | Sub-microsecond load-step recovery due to COT architecture and no phase-margin constraints. |
| Adjustable undervoltage lockout | Independent UVLO threshold and hysteresis programming via external resistor divider enables custom brownout behavior. |
Applications
| Smart Power Meters | Telecom Systems |
|---|---|
Use Scenario: Metering ICs and RF transceivers require isolated 3.3-V/5-V rails from 100-V DC distribution lines in AMI infrastructure. IC Role / Device Role / Timing Role: LM5018MR/NOPB operates in Fly-Buck™ mode to generate isolated bias without optocouplers or extra windings. Use Value: Eliminates transformer complexity and reduces bill-of-materials cost while maintaining >85% efficiency at 100-mA load. | Use Scenario: Base station remote radio units (RRUs) need reliable 12-V auxiliary supply from 48-V backplane with minimal footprint. IC Role / Device Role / Timing Role: LM5018MR/NOPB functions as primary buck regulator with COT control ensuring stable operation under dynamic load transients. Use Value: Delivers <100-ns current-limit response and <2% output regulation accuracy across –40°C to +125°C ambient. |
| Automotive Electronics | Industrial Isolated Bias Supply |
Use Scenario: ADAS camera modules require clean 5-V rail from 12–16-V battery with cold-crank tolerance down to 6 V. IC Role / Device Role / Timing Role: LM5018MR/NOPB leverages wide 7.5–100-V input range and adjustable UVLO to sustain operation during cranking dips. Use Value: Maintains regulation at 6.5-V input (via UVLO hysteresis tuning) while delivering 300-mA continuous current. | Use Scenario: PLC I/O modules need galvanically isolated 3.3-V supply for microcontroller and analog front-end from 24-V field bus. IC Role / Device Role / Timing Role: LM5018MR/NOPB configured in Fly-Buck™ mode generates isolated output using single transformer winding. Use Value: Achieves >3 kVRMS isolation rating with <1% cross-regulation error between primary and secondary outputs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5160QPWPRQ1 | 42-V max input, 600-mA output, integrated LDO, AEC-Q100 qualified | Better suited for automotive infotainment with lower VIN and higher current; lacks Fly-Buck™ capability | Select when AEC-Q100 compliance and >300-mA load are mandatory, but 100-V operation is not required. |
| LM5008AMM/NOPB | 75-V max input, 150-mA output, same COT architecture and pinout family | Lower current rating and reduced input voltage headroom; shares layout compatibility but not drop-in replacement | Choose for cost-sensitive designs with ≤150-mA loads and <75-V input; verify RON and FB divider recalibration. |
Compared with LM5018MR/NOPB, LM5160QPWPRQ1 offers automotive qualification and higher current but sacrifices 100-V capability and Fly-Buck™ functionality; LM5008AMM/NOPB retains COT control and layout familiarity but halves output current and input voltage range-making LM5018MR/NOPB uniquely suited for high-input, isolated-bias applications.
Availability
LM5018MR/NOPB is available at Aetrix Electronics and suitable for smart power meters, telecom systems, and automotive electronics requiring stable component supply across extended temperature and voltage ranges.
Supply support for LM5018MR/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 LM5018MR/NOPB belongs to TI's high-voltage DC/DC regulator product line, engineered specifically for industrial, telecom, and automotive applications demanding wide-input operation, integrated FETs, and Fly-Buck™ isolation capability.
FAQ
What is the maximum input voltage rating for the LM5018MR/NOPB?
The LM5018MR/NOPB has an absolute maximum input voltage rating of 100 V applied to the VIN pin relative to RTN. It operates continuously across 7.5 V to 100 V, making it suitable for 48-V telecom systems and automotive battery monitoring applications where transient spikes may reach 80–100 V. Exceeding 100 V risks permanent damage per Section 6.1 of the datasheet.
Does the LM5018MR/NOPB support Fly-Buck™ topology out of the box?
Yes, the LM5018MR/NOPB natively supports Fly-Buck™ operation without firmware or external timing components. Its constant-on-time control, integrated synchronous rectifier, and bootstrap gate drive enable isolated output generation using a coupled inductor-confirmed in Section 2 Applications and Figure 8-2 of the datasheet. No optocoupler or third winding is required.
What is the purpose of the RON pin on the LM5018MR/NOPB?
The RON pin on the LM5018MR/NOPB sets the minimum on-time duration via an external resistor connected to VIN. This resistor determines switching frequency in conjunction with input voltage (TON ∝ RON/VIN), enabling frequency adjustment up to 1 MHz. A 100-kΩ resistor yields ~250 ns on-time at 48 V, as specified in Section 6.6 Timing Requirements.
Can the LM5018MR/NOPB operate without an external bootstrap capacitor?
No, the LM5018MR/NOPB requires a 0.01-µF ceramic capacitor between BST and SW pins for proper high-side gate drive. This capacitor is charged through the internal VCC-to-BST diode during the SW low phase. Omitting it causes immediate high-side FET failure due to insufficient gate voltage-explicitly mandated in Section 5 Pin Functions and Figure 7-1.
What is the feedback reference voltage accuracy of the LM5018MR/NOPB?
LM5018MR/NOPB features a precision 1.225-V internal feedback reference with ±2% tolerance over –40°C to +125°C junction temperature, as specified in Section 6.5 Electrical Characteristics. This enables accurate output voltage setting (e.g., 5.0 V ±0.1 V) using standard 1% resistors in the FB divider network.
LM5018MR/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive, Isolation Capable
- 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:
- 300mA
- 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-SO PowerPad
LM5018MR/NOPB FAQ
1.How can I place an order for LM5018MR/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5018MR/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 LM5018MR/NOPB reliable?
The price and inventory of LM5018MR/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5018MR/NOPB is usually 5 days.
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LM5018MR/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5018MR/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 LM5018MR/NOPB?
For technical support, including LM5018MR/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5018MR/NOPB requirements.
6.How does Aetrix verify that LM5018MR/NOPB is sourced from the original manufacturer or authorized distributors?
All LM5018MR/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 LM5018MR/NOPB meets industry standards.
7.What is the process for return or replacement of LM5018MR/NOPB?
All LM5018MR/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM5018MR/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 LM5018MR/NOPB part is unused and in its original packaging.
Return procedure for LM5018MR/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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