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Texas Instruments LM25019SD/NOPB
- Part No.:
- LM25019SD/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
LM25019SD/NOPB.pdf
- Description:
- IC REG BUCK ADJ 100MA 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:2,868
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Product details
Overview
LM25019SD/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 power in telecom systems and industrial equipment using an 8-pin WSON package.
For engineers reviewing the LM25019SD/NOPB datasheet, LM25019SD/NOPB pinout, LM25019SD/NOPB application, or LM25019SD/NOPB equivalent, key selection criteria include input voltage range (7.5–48 V), adjustable switching frequency up to 1 MHz via RON resistor, intelligent peak current limit (150–370 mA), thermal shutdown at 165°C, and Fly-Buck™ topology support for isolated outputs without external Schottky diodes.
Technical Context
The LM25019SD/NOPB implements a constant on-time (COT) control architecture where on-time is inversely proportional to VIN and set by an external RON resistor, enabling near-constant frequency operation across 7.5–48 V input. Its internal 7.6-V VCC regulator powers gate drivers and logic, with bootstrap capacitor charging via internal diode between BST and SW pins.
Regulation relies on a 1.225-V internal reference compared against FB voltage; overvoltage protection triggers at 1.62 V. Current limiting uses a forced off-time inversely proportional to VFB, providing short-circuit protection with reduced foldback during partial overloads - critical for reliable operation in smart meters and telecom bias supplies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 7.5 V to 48 V - supports direct connection to industrial 24-V/48-V rails and telecom -48-V systems. |
| Output Current | 100 mA continuous - sufficient for isolated auxiliary bias rails in Fly-Buck™ configurations. |
| 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 - 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. |
| Peak Current Limit | 150–370 mA - provides robust short-circuit protection while minimizing output voltage sag during transients. |
| UVLO Threshold | 1.225 V rising with programmable hysteresis - enables custom input undervoltage lockout using external resistor divider. |
Pinout & Package
LM25019SD/NOPB is housed in an 4.00 mm × 4.00 mm, 8-pin WSON (NGU) package with exposed thermal pad soldered to RTN for enhanced thermal performance (RθJA = 41.3°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 RTN | Ground reference | Primary return path for all internal circuits; must be connected to system ground plane via exposed pad. |
| 2 VIN | Main power input | Accepts 7.5–48 V; powers internal VCC regulator and high-voltage gate drivers. |
| 3 UVLO | Undervoltage detection input | Enables programmable startup threshold and hysteresis via external resistor divider from VIN. |
| 4 RON | On-time programming | Resistor from VIN sets minimum on-time; determines operating frequency and ensures ≥100 ns at 48 V. |
| 5 FB | Feedback input | Compares against 1.225-V reference; requires ≥25 mV ripple for stable COT operation. |
| 6 VCC | Bias supply output | 7.6-V regulated output for internal logic and gate drivers; requires 1.0-μF decoupling capacitor. |
| 7 BST | Bootstrap supply | Charged from VCC through internal diode when SW is low; drives high-side MOSFET gate. |
| 8 SW | Switching node | Connects to inductor and bootstrap capacitor; carries full switching current and voltage transitions. |
Key Features
| Feature | Design Value |
|---|---|
| Constant on-time (COT) control | Eliminates need for external compensation network, simplifying design and improving transient response. |
| Integrated synchronous switches | 100-mA rated high-side and low-side N-MOSFETs reduce BOM count and eliminate external Schottky diode. |
| Fly-Buck™ topology support | Enables isolated auxiliary outputs without optocouplers or transformers - ideal for bias supplies in telecom systems. |
| Intelligent peak current limit | Off-time scales with FB voltage, reducing foldback during moderate overloads and accelerating recovery. |
| Programmable UVLO and remote shutdown | UVLO pin accepts external resistor divider; pulling UVLO below 0.66 V forces low-current shutdown mode. |
Applications
| Industrial Power Supplies | Smart Electricity Meters |
|---|---|
|
Use Scenario: Providing regulated 5-V or 12-V auxiliary power from 24-V or 48-V factory bus rails. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering isolated bias for microcontrollers, sensors, and communication ICs. Use Value: Eliminates need for external Schottky diode and compensation components, reducing board area and design cycle time. |
Use Scenario: Generating isolated 3.3-V supply for metrology ASIC and RF modules in revenue-grade meters. IC Role / Device Role / Timing Role: Fly-Buck™ converter generating galvanically isolated output without transformer winding complexity. Use Value: Achieves >85% efficiency at 50-mA load while meeting IEC 62053 creepage/clearance requirements via PCB layout alone. |
| Telecom Line Cards | Isolated Gate Driver Bias |
|
Use Scenario: Supplying 15-V isolated bias for RS-485 transceivers and PoE controllers on telecom line cards. IC Role / Device Role / Timing Role: Synchronous buck regulator operating from -48-V telecom supply with reverse-polarity protection. Use Value: Supports wide input range down to 7.5 V, enabling brownout tolerance during battery backup transitions. |
Use Scenario: Delivering floating 12-V gate drive supply for half-bridge IGBTs in motor drives and inverters. IC Role / Device Role / Timing Role: Fly-Buck™ regulator generating isolated bias referenced to high-side switch node. Use Value: Enables compact, low-cost isolated bias generation without dedicated isolated DC/DC modules or transformers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5164QDRCRQ1 | Wider 3–65 V input, 150-mA output, integrated soft-start, AEC-Q100 qualified. | Automotive body electronics requiring extended temp range and qualification. | Choose LM5164QDRCRQ1 only if automotive qualification or >48-V input is required; not pin-compatible. |
| TPS54202DDCR | Lower 4.5–28 V input, 2-A output, adaptive COT, smaller 6-pin SOT-23 package. | Higher-current non-isolated point-of-load regulation in consumer electronics. | Choose TPS54202DDCR for higher output current and smaller footprint where input ≤28 V suffices. |
Compared with LM5164QDRCRQ1 and TPS54202DDCR, the LM25019SD/NOPB uniquely supports Fly-Buck™ isolation from 48-V inputs with integrated synchronous switches and no external diode - making it optimal for cost-sensitive industrial and telecom bias supplies where isolation and 48-V operation are mandatory.
Availability
LM25019SD/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, smart electricity meters, and telecom line cards requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LM25019SD/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 ICs, with decades of expertise in high-reliability power conversion solutions.
The LM25019SD/NOPB belongs to TI's high-voltage synchronous buck regulator product line, designed specifically for industrial and telecom applications needing efficient, isolated auxiliary power from 48-V rails without external diodes or complex compensation.
FAQ
What is the maximum input voltage rating for the LM25019SD/NOPB?
The LM25019SD/NOPB has an absolute maximum input voltage rating of 53 V across VIN to RTN, with recommended operation up to 48 V. Exceeding 48 V may degrade reliability or trigger overvoltage protection. The device is optimized for industrial 24-V and telecom -48-V systems, and its internal VCC regulator and gate drivers are rated for continuous 48-V operation.
Does the LM25019SD/NOPB support Fly-Buck™ topology out of the box?
Yes, the LM25019SD/NOPB natively supports Fly-Buck™ operation without firmware or external circuitry. Its constant on-time control, integrated synchronous rectifier, and ability to regulate based on reflected output ripple enable isolated auxiliary outputs using only 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 the LM25019SD/NOPB?
The RON pin on the LM25019SD/NOPB sets the minimum on-time via an external resistor connected to VIN. This directly controls switching frequency - e.g., a 100-kΩ resistor yields ~240 kHz at 48 V input. The RON resistor ensures on-time stays ≥100 ns at max VIN, preventing control instability and guaranteeing proper bootstrap capacitor recharge.
Can the LM25019SD/NOPB operate without an external bootstrap capacitor?
No. The LM25019SD/NOPB requires a 0.01-μF ceramic capacitor between BST and SW pins. This capacitor supplies gate drive voltage for the high-side N-MOSFET during on-time. Without it, the high-side switch fails to turn on, halting regulation. TI specifies this in Section 5.1 and Figure 5-2 of the LM25019SD/NOPB datasheet.
How does the LM25019SD/NOPB handle output overvoltage conditions?
The LM25019SD/NOPB includes an internal 1.62-V overvoltage comparator monitoring the FB pin. If FB exceeds 1.62 V - indicating output overvoltage due to sudden load removal or input surge - the on-time pulse terminates immediately. The high-side switch remains off until FB falls back below 1.225 V, preventing damage to downstream circuitry.
LM25019SD/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:
- 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-WSON (4x4)
LM25019SD/NOPB FAQ
1.How can I place an order for LM25019SD/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM25019SD/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 LM25019SD/NOPB reliable?
The price and inventory of LM25019SD/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM25019SD/NOPB is usually 5 days.
3.What payment methods are accepted for LM25019SD/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM25019SD/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM25019SD/NOPB?
LM25019SD/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM25019SD/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 LM25019SD/NOPB?
For technical support, including LM25019SD/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM25019SD/NOPB requirements.
6.How does Aetrix verify that LM25019SD/NOPB is sourced from the original manufacturer or authorized distributors?
All LM25019SD/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 LM25019SD/NOPB meets industry standards.
7.What is the process for return or replacement of LM25019SD/NOPB?
All LM25019SD/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM25019SD/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 LM25019SD/NOPB part is unused and in its original packaging.
Return procedure for LM25019SD/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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