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Texas Instruments LM25019MRX/NOPB
- Part No.:
- LM25019MRX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM25019MRX/NOPB.pdf
- Description:
- IC REG BUCK ADJ 100MA 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:13,125
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Product details
Overview
LM25019MRX/NOPB from Texas Instruments is a 48-V, 100-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 supply in telecom systems and industrial equipment.
For engineers reviewing the LM25019MRX/NOPB datasheet, LM25019MRX/NOPB pinout, LM25019MRX/NOPB application, or LM25019MRX/NOPB equivalent, key selection considerations include input voltage range (7.5–48 V), adjustable switching frequency up to 1 MHz, intelligent peak current limit (150–370 mA), thermal shutdown at 165°C, and dual-package availability (WSON-8 and SO PowerPAD-8).
Technical Context
The LM25019MRX/NOPB implements constant on-time (COT) control with VIN-inversely proportional on-time set by RON, enabling near-constant frequency across 7.5–48 V input and eliminating need for external loop compensation. Its internal 7.6-V VCC regulator powers gate drivers and logic, while bootstrap capacitor charging via internal diode ensures reliable high-side drive.
It features an intelligent current-limit off-timer whose duration depends on FB voltage and VIN-e.g., 16 µs at FB = 0 V and VIN = 48 V for short-circuit protection-and integrates undervoltage lockout with independently programmable threshold (1.19–1.26 V) and hysteresis via external resistor divider on UVLO pin.
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 Capability | 100 mA - sufficient for isolated bias supplies and low-power auxiliary rails |
| Feedback Reference | 1.225 V ±2% - enables precise output voltage setting with external resistor divider |
| Switching Frequency Range | Adjustable up to 1 MHz via RON - allows optimization of size vs. efficiency in space-constrained designs |
| Peak Current Limit | 150–370 mA - provides overload protection with adaptive off-time scaling for fast recovery |
| Thermal Shutdown | 165°C with 20°C hysteresis - prevents catastrophic failure during sustained overloads or poor thermal design |
| Operating Junction Temp | −40°C to +125°C - rated for harsh industrial and telecom environments |
Pinout & Package
LM25019MRX/NOPB is available in two thermally enhanced packages: 8-pin WSON (4.00 mm × 4.00 mm) and 8-pin SO PowerPAD™ (4.89 mm × 3.90 mm), both featuring exposed thermal pads soldered to PCB ground for improved heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 RTN | Ground reference | Primary IC ground connection; must be tied to system GND and exposed pad |
| 2 VIN | Main power input | Accepts 7.5–48 V; powers internal VCC regulator and high-voltage circuitry |
| 3 UVLO | Undervoltage detection input | Enables programmable startup threshold and hysteresis via external resistor divider |
| 4 RON | On-time programming | Resistor from VIN sets minimum on-time and thus operating frequency |
| 5 FB | Feedback input | Compares output voltage (via resistor divider) to 1.225-V internal reference |
| 6 VCC | Bias supply output | 7.6-V regulated output for internal logic and gate drivers; requires 1-μF decoupling |
| 7 BST | Bootstrap supply | Charged from VCC through internal diode during SW low-phase; drives high-side gate |
| 8 SW | Switching node | Connects to inductor and bootstrap capacitor; carries full switching current and voltage stress |
Key Features
| Feature | Design Value |
|---|---|
| No external loop compensation | Constant on-time architecture eliminates need for compensation network, reducing BOM count and layout complexity |
| Integrated synchronous switches | On-chip 0.8-Ω high-side and 0.45-Ω low-side N-MOSFETs eliminate external FETs and Schottky diodes |
| Fly-Buck™ capability | Supports isolated output generation using coupled inductor without optocoupler or secondary controller |
| Remote shutdown | UVLO pin pulled below 0.66 V places device in <50-µA shutdown mode for system-level power sequencing |
| Intelligent current limiting | Off-time scales inversely with FB voltage - shorter off-times under mild overload improve transient recovery |
Applications
| Industrial Power Supplies | Telecom Bias Rails |
|---|---|
Use Scenario: Providing 5-V or 12-V auxiliary power in programmable logic controllers (PLCs) and motor drives operating from 24-V or 48-V DC bus. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering stable, low-noise bias voltage with minimal external components. Use Value: Enables compact, efficient local regulation without pre-regulator stages-reducing board area and thermal load in DIN-rail mounted equipment. | Use Scenario: Generating isolated 3.3-V or 5-V bias for Ethernet PHYs, line cards, and optical transceivers in 48-V telecom infrastructure. IC Role / Device Role / Timing Role: Fly-Buck™ converter implementing galvanically isolated output using single coupled inductor and no optocoupler. Use Value: Eliminates need for separate isolated DC/DC modules-cutting cost and footprint while maintaining safety isolation requirements. |
| Smart Meter Auxiliary Supply | Isolated Sensor Interface |
Use Scenario: Powering metrology ASICs, RF modules, and real-time clocks in ANSI C12.1-compliant smart electricity meters fed from 12-V or 24-V battery or energy harvesting sources. IC Role / Device Role / Timing Role: High-input-voltage buck regulator with ultra-low shutdown current (<225 µA) preserving battery life during sleep modes. Use Value: Supports >10-year battery operation via remote shutdown and thermal robustness across −40°C to +85°C ambient. | Use Scenario: Supplying isolated power to current-sense amplifiers, isolated ADCs, or RS-485 transceivers in industrial I/O modules. IC Role / Device Role / Timing Role: Fly-Buck™ regulator generating floating 5-V rail referenced to sensor ground, rejecting common-mode noise up to 2 kV. Use Value: Achieves reinforced isolation compliance (IEC 61000-4-5) without transformer driver ICs-simplifying certification and improving reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5164QWRXMRQ1 | Automotive-grade AEC-Q100 qualified; wider 4.5–100-V input; 300-mA output; requires external compensation | Suitable for automotive body electronics requiring extended temperature and qualification; not drop-in due to different control scheme and pinout | Select when automotive qualification, higher output current, or extended input range is mandatory |
| TPS54160DGQR | Non-synchronous buck; 3.5–60-V input; 1.5-A output; current-mode control with compensation; larger solution size | Better suited for higher-current industrial rails where efficiency at light load is less critical than cost | Choose when >100-mA output and lower BOM cost outweigh synchronous efficiency benefits |
Compared with LM5164QWRXMRQ1 and TPS54160DGQR, the LM25019MRX/NOPB offers integrated synchronous FETs and COT control for minimal external components and ultra-fast transient response-but at lower output current and without automotive qualification.
Availability
LM25019MRX/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, telecom bias rails, and smart meter auxiliary supplies requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LM25019MRX/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 ICs, embedded processors, and power management solutions for industrial, automotive, and communications markets.
The LM25019MRX/NOPB belongs to TI's high-voltage DC/DC regulator product line, engineered specifically for efficient, compact, and isolated bias generation in 24-V/48-V systems where simplicity and reliability are critical.
FAQ
What is the maximum input voltage rating for LM25019MRX/NOPB?
The absolute maximum input voltage (VIN to RTN) for LM25019MRX/NOPB is 53 V, but the recommended operating range is 7.5 V to 48 V. Operation above 48 V risks exceeding thermal limits and violating safe operating area constraints, especially at high switching frequencies. The internal VCC regulator and gate drivers are optimized for this 48-V max operational envelope, and sustained use beyond it may reduce reliability or trigger overvoltage protection.
Does LM25019MRX/NOPB support Fly-Buck™ topology out of the box?
Yes, LM25019MRX/NOPB natively supports Fly-Buck™ operation without additional ICs. Its constant on-time control, integrated synchronous rectifier, and ability to regulate based on primary-side feedback enable isolated output generation using a single coupled inductor. TI's official reference designs (e.g., TIDA-00785) confirm validated Fly-Buck™ implementations with LM25019MRX/NOPB delivering up to 100 mA at ±5% regulation across load and line variations.
What is the purpose of the RON pin on LM25019MRX/NOPB?
The RON pin on LM25019MRX/NOPB sets the minimum on-time period via an external resistor connected 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. This resistor also ensures on-time remains ≥100 ns at max VIN-critical for stable COT control. TI provides design equations and curves (Figure 6-5) to select RON for target frequency and input range.
Can LM25019MRX/NOPB operate without an external bootstrap capacitor?
No, LM25019MRX/NOPB requires a 0.01-μF ceramic capacitor between BST and SW pins. This bootstrap capacitor supplies gate drive voltage for the high-side N-MOSFET during its on-time. Without it, the high-side switch cannot turn on reliably, causing regulation failure or excessive heating. The internal diode charges the capacitor during SW low-phase, and minimum off-time (144 ns) ensures adequate recharge time-making the capacitor non-optional in all configurations.
How does the current limit protection work in LM25019MRX/NOPB?
LM25019MRX/NOPB uses intelligent peak current limiting: if inductor current exceeds 150–370 mA (depending on conditions), the on-time terminates immediately and a programmable off-time begins. This off-time scales inversely with FB voltage-e.g., 16 µs at FB = 0 V (short circuit) but shorter under partial overload-enabling faster recovery than fixed-foldback schemes. The feature is implemented entirely internally with no external components required.
LM25019MRX/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:
- 100mA
- 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
LM25019MRX/NOPB FAQ
1.How can I place an order for LM25019MRX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM25019MRX/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 LM25019MRX/NOPB reliable?
The price and inventory of LM25019MRX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM25019MRX/NOPB is usually 5 days.
3.What payment methods are accepted for LM25019MRX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM25019MRX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM25019MRX/NOPB?
LM25019MRX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM25019MRX/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 LM25019MRX/NOPB?
For technical support, including LM25019MRX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM25019MRX/NOPB requirements.
6.How does Aetrix verify that LM25019MRX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM25019MRX/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 LM25019MRX/NOPB meets industry standards.
7.What is the process for return or replacement of LM25019MRX/NOPB?
All LM25019MRX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM25019MRX/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 LM25019MRX/NOPB part is unused and in its original packaging.
Return procedure for LM25019MRX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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