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Texas Instruments LM25019MR/NOPB
- Part No.:
- LM25019MR/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM25019MR/NOPB.pdf
- Description:
- IC REG BUCK ADJ 100MA 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:1,490
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Product details
Overview
LM25019MR/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 - used in isolated bias supplies and industrial power rails.
For engineers reviewing the LM25019MR/NOPB datasheet, LM25019MR/NOPB pinout, LM25019MR/NOPB application, or LM25019MR/NOPB equivalent, key selection criteria include input voltage range (7.5–48 V), adjustable switching frequency up to 1 MHz via RON, thermal shutdown at 165°C, remote shutdown capability, and dual-package availability (WSON-8 and SO PowerPAD-8).
Technical Context
The LM25019MR/NOPB implements a constant on-time (COT) control architecture where on-time is inversely proportional to VIN and set by an external resistor on the RON pin, enabling near-constant frequency operation across input voltage variations. Its intelligent peak current limit uses a forced off-time inversely proportional to FB voltage, delivering short-circuit protection with minimal foldback.
It integrates a 7.6-V internal VCC regulator powered from VIN, supporting gate drive for both MOSFETs via bootstrap capacitor (BST–SW), and features dual-level UVLO with independently programmable threshold and hysteresis using an external resistor divider on the 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 external pre-regulation. |
| Output Current | 100 mA continuous - sufficient for isolated bias, auxiliary, or low-power system rails. |
| Feedback Reference | 1.225 V ±2% - enables precise output voltage setting (e.g., 3.3 V, 5 V, 12 V) with two external resistors. |
| Switching Frequency | Adjustable up to 1 MHz via RON resistor - allows optimization of size vs. efficiency in space-constrained designs. |
| Thermal Shutdown | 165°C with 20°C hysteresis - protects against sustained overload or poor PCB thermal design. |
| UVLO Threshold | 1.225 V rising with programmable hysteresis - ensures clean start-up and brown-out recovery in noisy environments. |
| Peak Current Limit | 150–370 mA - provides robust overload and short-circuit protection while minimizing foldback delay. |
Pinout & Package
LM25019MR/NOPB is available in an 8-pin SO PowerPAD™ package (DDA, 4.89 mm × 3.90 mm) with exposed thermal pad soldered to RTN for enhanced thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 RTN | Ground reference | System ground connection; exposed pad must be soldered to RTN plane for thermal and electrical integrity. |
| 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; pulled below 0.66 V forces shutdown mode. |
| 4 RON | On-time programming | Resistor to VIN sets minimum on-time and thus operating frequency; min 100 ns at 48 V. |
| 5 FB | Feedback input | Compares output voltage (via RFB1/RFB2) to 1.225-V internal reference for regulation. |
| 6 VCC | Internal bias supply output | 7.6-V regulated output for gate drivers and logic; requires 1-μF decoupling capacitor. |
| 7 BST | Bootstrap supply | Charged from VCC through internal diode during SW low phase; drives high-side MOSFET gate. |
| 8 SW | Switching node | Connects to inductor and BST capacitor; carries full switching waveform and high dV/dt. |
Key Features
| Feature | Design Value |
|---|---|
| Constant on-time (COT) control | Eliminates need for external compensation network, simplifies design and improves transient response. |
| Integrated synchronous MOSFETs | Reduces BOM count and layout complexity; eliminates external Schottky diode in buck topology. |
| Fly-Buck™ capability | Enables isolated output generation using coupled inductor without optocoupler or secondary controller. |
| Programmable UVLO with hysteresis | Allows tailored brown-in/brown-out behavior using two external resistors - critical for reliable system sequencing. |
| Intelligent peak current limit | Off-time scales with FB voltage, reducing foldback severity during moderate overloads and speeding recovery. |
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 microcontrollers, sensors, and communication ICs in factory automation systems. IC Role / Device Role / Timing Role: Primary non-isolated DC-DC converter providing stable, efficient local power with fast load-step response. Use Value: Delivers 100 mA at >90% efficiency across 7.5–48 V input, eliminating need for external compensation and reducing design cycle time. |
Use Scenario: Generating isolated 5-V or 12-V bias for metrology ASICs and RF modules in revenue-grade smart electricity meters. IC Role / Device Role / Timing Role: Fly-Buck™ controller using coupled inductor to produce isolated output without optocoupler or secondary feedback. Use Value: Achieves isolation compliance (IEC 62053) with single IC, reducing component count and board area versus discrete flyback solutions. |
| Telecom Line Card Supply | Isolated Gate Driver Bias |
|
Use Scenario: Providing compact, high-reliability 12-V auxiliary supply on telecom line cards operating from -48-V DC distribution rail. IC Role / Device Role / Timing Role: Synchronous buck regulator converting rectified -48-V input (via polarity inversion) to positive 12 V. Use Value: Supports wide input range and thermal shutdown, ensuring uninterrupted operation in uncontrolled environmental conditions. |
Use Scenario: Generating isolated +15 V/–5 V gate drive supply for IGBTs or SiC MOSFETs in motor drives and inverters. IC Role / Device Role / Timing Role: Fly-Buck™ regulator driving center-tapped transformer to produce complementary isolated outputs. Use Value: Enables compact, low-noise gate bias with inherent cross-conduction immunity due to COT timing predictability. |
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 | 42-V input, 150-mA, integrated FET, but uses current-mode control requiring compensation; AEC-Q100 qualified. | Targeted for automotive infotainment and ADAS power rails; lacks Fly-Buck™ support and programmable UVLO. | Choose when automotive qualification and higher output current are required, and compensation is acceptable. |
| TPS54160AIDR | 60-V input, 1.5-A, external FETs, current-mode control; no integrated switches or Fly-Buck™ capability. | Suitable for higher-current industrial supplies; requires external MOSFETs, gate drivers, and compensation network. | Choose when >100-mA output or >48-V input is needed, and board space permits discrete power stage. |
Compared with LM5164QWRXMRQ1 and TPS54160AIDR, the LM25019MR/NOPB uniquely combines integrated 100-mA synchronous FETs, Fly-Buck™ isolation, COT control with zero compensation, and dual-package thermal flexibility - making it optimal for compact, low-component-count isolated bias and auxiliary rails.
Availability
LM25019MR/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.
Supply support for LM25019MR/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, serving industrial, automotive, and communications markets.
The LM25019MR/NOPB belongs to TI's high-voltage DC-DC regulator product line, designed specifically for compact, isolated, and non-isolated auxiliary power in harsh-input industrial and telecom environments.
FAQ
What is the maximum input voltage rating for LM25019MR/NOPB?
The absolute maximum input voltage (VIN to RTN) for LM25019MR/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 under high-frequency or high-load conditions. The internal VCC regulator and gate drivers are optimized for this 48-V ceiling.
Does LM25019MR/NOPB support Fly-Buck™ topology out of the box?
Yes, LM25019MR/NOPB natively supports Fly-Buck™ operation without firmware or external controllers. Its constant on-time control, synchronous rectification, and ability to regulate based on primary-side feedback enable isolated output generation using a coupled inductor - confirmed in TI's SNVS952F datasheet Figure 8-2 and Section 8.2.
What is the purpose of the RON pin on LM25019MR/NOPB?
The RON pin on LM25019MR/NOPB sets the minimum on-time duration via an external resistor to VIN, directly determining switching frequency. For example, a 100-kΩ resistor yields ~250 ns on-time at 48 V, resulting in ~240 kHz operation. This resistor also ensures on-time stays above 100 ns - a hard requirement for stable COT operation.
Can LM25019MR/NOPB operate without an external bootstrap capacitor?
No. LM25019MR/NOPB requires a 0.01-μF ceramic capacitor between BST and SW pins to charge the high-side gate driver. Without it, the high-side N-MOSFET cannot turn on, causing complete failure of regulation. The internal bootstrap diode only charges this capacitor during SW low periods, and minimum off-time (144 ns) ensures sufficient recharge time.
How does the current limit protection work in LM25019MR/NOPB?
LM25019MR/NOPB uses intelligent peak current limiting: if inductor current exceeds 150–370 mA (depending on temp), the switch turns off immediately and initiates a forced off-time inversely proportional to FB voltage. At FB = 0 V (e.g., short circuit), off-time reaches ~16 μs; at higher FB, off-time shrinks - minimizing foldback and improving recovery speed.
LM25019MR/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
- 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
LM25019MR/NOPB FAQ
1.How can I place an order for LM25019MR/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM25019MR/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 LM25019MR/NOPB reliable?
The price and inventory of LM25019MR/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM25019MR/NOPB is usually 5 days.
3.What payment methods are accepted for LM25019MR/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM25019MR/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM25019MR/NOPB?
LM25019MR/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM25019MR/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 LM25019MR/NOPB?
For technical support, including LM25019MR/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM25019MR/NOPB requirements.
6.How does Aetrix verify that LM25019MR/NOPB is sourced from the original manufacturer or authorized distributors?
All LM25019MR/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 LM25019MR/NOPB meets industry standards.
7.What is the process for return or replacement of LM25019MR/NOPB?
All LM25019MR/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM25019MR/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 LM25019MR/NOPB part is unused and in its original packaging.
Return procedure for LM25019MR/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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