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Texas Instruments LM5019MRX/NOPB
- Part No.:
- LM5019MRX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM5019MRX/NOPB.pdf
- Description:
- IC REG BUCK ADJ 100MA 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:9,222
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Product details
Overview
LM5019MRX/NOPB from Texas Instruments is a 100-V input, 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 automotive electronics using Fly-Buck topology.
For engineers reviewing the LM5019MRX/NOPB datasheet, LM5019MRX/NOPB pinout, LM5019MRX/NOPB application, or LM5019MRX/NOPB equivalent, key selection considerations include its 7.5–100-V input range, adjustable switching frequency up to 1 MHz, intelligent peak current limit (240 mA typ), thermal shutdown at 165°C, and dual-package availability (WSON-8 and SO PowerPAD-8).
Technical Context
The LM5019MRX/NOPB implements a constant-on-time (COT) control scheme where on-time is inversely proportional to VIN via external RON resistor, enabling near-constant frequency across input voltage and eliminating need for loop compensation. Its regulation relies on direct comparison of FB voltage to 1.225-V internal reference, with overvoltage protection triggered at 1.62 V.
It integrates a 7.6-V internal VCC regulator (with 4.5-V UVLO) for gate drive and logic bias, and uses bootstrap charging (BST–SW capacitor) to sustain high-side N-MOSFET operation. Current limiting employs a forced off-time inversely proportional to VFB, providing adaptive short-circuit protection without foldback.
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 Capability | 100 mA - sufficient for isolated auxiliary bias supplies in smart meters and industrial controllers. |
| Feedback Reference | 1.225 V ±2% - enables precise output voltage setting (e.g., 3.3 V, 5 V, 12 V) using standard resistor dividers. |
| Switching Frequency Range | Adjustable up to 1 MHz via RON - allows optimization of size vs. efficiency in space-constrained designs. |
| Peak Current Limit | 240 mA (typ) - provides robust overload protection while maintaining fast transient response during load steps. |
| Thermal Shutdown Threshold | 165°C with 20°C hysteresis - prevents permanent damage under sustained overtemperature conditions. |
| VCC Regulator Output | 7.6 V ±0.65 V - powers internal gate drivers and logic; disables when externally supplied 8.55–13 V is applied. |
Pinout & Package
LM5019MRX/NOPB is packaged in an 8-pin SO PowerPAD (DDA) with exposed thermal pad (4.89 mm × 3.90 mm), requiring connection of the exposed pad to RTN for optimal thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 RTN | Ground reference | System ground return for all internal circuits; must be connected to PCB ground plane and exposed pad. |
| 2 VIN | Main input supply | Accepts 7.5–100 V DC; powers internal VCC regulator and high-voltage switch circuitry. |
| 3 UVLO | Undervoltage lockout control | Resistor-divider programmable start-up threshold (1.225 V typ); <0.66 V forces shutdown mode. |
| 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 divider to 1.225-V reference; also triggers overvoltage shutdown at 1.62 V. |
| 6 VCC | Bias supply output | 7.6-V regulated output for internal logic and gate drivers; requires 1-μF decoupling capacitor. |
| 7 BST | Bootstrap supply | Charged via internal diode from VCC during SW low phase; requires 0.01-μF ceramic capacitor to SW. |
| 8 SW | Switching node | Drives external inductor; connects to both high-side and low-side MOSFETs internally; high dv/dt node. |
Key Features
| Feature | Design Value |
|---|---|
| No external Schottky diode required | Integrated synchronous rectifier eliminates conduction loss and thermal management overhead of discrete diodes. |
| Constant-on-time (COT) control | Enables ultra-fast transient response and stable operation without compensation network design effort. |
| Fly-Buck™ topology support | Allows isolated output generation using single inductor-ideal for low-power auxiliary rails in industrial gateways. |
| Adjustable undervoltage lockout | Independent programming of enable threshold and hysteresis via external resistor divider on UVLO pin. |
| Remote shutdown capability | UVLO pin pulled below 0.66 V places device in low-current shutdown (<225 µA), enabling system-level power sequencing. |
Applications
| Smart Power Meters | Telecom Systems |
|---|---|
Use Scenario: Providing isolated 3.3-V/5-V bias for metrology ICs and RF modules in utility-grade electricity meters. IC Role / Device Role / Timing Role: Primary DC-DC converter implementing Fly-Buck™ topology to generate isolated auxiliary rail from 100-V DC input bus. Use Value: Eliminates need for separate isolated DC-DC module, reducing BOM count and board area while meeting IEC 62053 creepage requirements via transformerless isolation. |
Use Scenario: Generating 12-V bias for PoE interface controllers and line-card supervisors in 48-V telecom infrastructure. IC Role / Device Role / Timing Role: Synchronous buck regulator delivering stable 100-mA output from fluctuating -48-V nominal bus (7.5–100-V range). Use Value: Maintains regulation during brownouts and surges common in central office environments, with no loop tuning required across temperature and load. |
| Automotive Electronics | Isolated Bias Supply |
Use Scenario: Powering CAN transceiver and microcontroller peripherals in 12-V/24-V vehicle subsystems with load-dump immunity. IC Role / Device Role / Timing Role: High-input-voltage buck regulator handling ISO 7637-2 pulse 5a (120-V transient) without external TVS clamping. Use Value: Withstands automotive load dump events up to 100 V, reducing need for upstream protection components and improving system reliability. |
Use Scenario: Generating galvanically isolated 5-V/3.3-V supply for isolated ADCs or digital isolators in industrial PLC I/O modules. IC Role / Device Role / Timing Role: Fly-Buck™ controller using single coupled inductor to achieve >2.5-kVRMS isolation without optocouplers or transformers. Use Value: Achieves reinforced isolation compliance (IEC 61000-4-5) with minimal component count and footprint, lowering cost versus discrete isolated flyback solutions. |
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 | Higher 65-V max input, 600-mA output, integrated error amplifier and soft-start; requires loop compensation. | Targets higher-current automotive body electronics; lacks Fly-Buck™ capability and 100-V rating. | Choose when >100-mA output or AEC-Q100 qualification is mandatory; not suitable for 100-V inputs or Fly-Buck™. |
| LM5017MRX/NOPB | Same 100-V input, but 600-mA output; identical COT architecture, pinout, and Fly-Buck™ support. | Direct upgrade path for higher-load isolated bias rails; shares layout compatibility and design tools. | Select when output current exceeds 100 mA; maintains identical feature set and package footprint. |
Compared with LM5017MRX/NOPB, LM5019MRX/NOPB offers lower output current but reduced thermal stress and smaller external components for ≤100-mA loads; versus LM5160QPWPRQ1, it retains 100-V operation and Fly-Buck™ capability at the expense of current capability and automotive qualification.
Availability
LM5019MRX/NOPB is available at Aetrix Electronics and suitable for smart power meters, telecom systems, and automotive electronics requiring stable component supply, long-term lifecycle assurance, and consistent parametric performance across production batches.
Supply support for LM5019MRX/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 LM5019MRX/NOPB belongs to TI's high-voltage DC-DC regulator product line, designed specifically for efficient, compact, and robust power conversion in industrial, automotive, and telecom applications where wide input range and isolation are critical.
FAQ
What is the maximum input voltage rating for LM5019MRX/NOPB?
The LM5019MRX/NOPB has an absolute maximum input voltage rating of 100 V across the VIN-to-RTN terminals, with recommended operating range from 7.5 V to 100 V. This enables direct connection to 48-V telecom buses and withstands automotive load-dump transients per ISO 7637-2 without external clamping.
Does LM5019MRX/NOPB support Fly-Buck™ topology out of the box?
Yes, LM5019MRX/NOPB natively supports Fly-Buck™ operation using a single coupled inductor to generate isolated outputs. Its constant-on-time control, integrated synchronous rectifier, and robust 100-V switch enable reliable isolated bias generation without optocouplers or secondary controllers.
What is the purpose of the RON pin on LM5019MRX/NOPB?
The RON pin on LM5019MRX/NOPB sets the minimum on-time duration via an external resistor to VIN. This resistor determines operating frequency (e.g., 100 kΩ yields ~250 ns on-time at 48 V), enabling frequency adjustment up to 1 MHz while maintaining nearly constant frequency across input voltage variations.
How does LM5019MRX/NOPB handle thermal overload conditions?
LM5019MRX/NOPB incorporates a thermal shutdown circuit that disables switching and the VCC regulator when junction temperature reaches 165°C (typ). Operation resumes automatically once temperature falls below 145°C due to 20°C hysteresis, protecting against permanent damage during sustained overtemperature events.
Can LM5019MRX/NOPB operate without external loop compensation components?
Yes, LM5019MRX/NOPB uses constant-on-time (COT) control architecture, which eliminates the need for external compensation networks. Stability is inherently achieved through ripple-based feedback, requiring only proper output capacitor ESR or dedicated ripple injection circuitry per application requirements.
LM5019MRX/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):
- 100V
- Voltage - Output (Min/Fixed):
- 1.225V
- Voltage - Output (Max):
- 90V
- Current - Output:
- 100mA
- 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
LM5019MRX/NOPB FAQ
1.How can I place an order for LM5019MRX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5019MRX/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 LM5019MRX/NOPB reliable?
The price and inventory of LM5019MRX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5019MRX/NOPB is usually 5 days.
3.What payment methods are accepted for LM5019MRX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5019MRX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5019MRX/NOPB?
LM5019MRX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5019MRX/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 LM5019MRX/NOPB?
For technical support, including LM5019MRX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5019MRX/NOPB requirements.
6.How does Aetrix verify that LM5019MRX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM5019MRX/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 LM5019MRX/NOPB meets industry standards.
7.What is the process for return or replacement of LM5019MRX/NOPB?
All LM5019MRX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM5019MRX/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 LM5019MRX/NOPB part is unused and in its original packaging.
Return procedure for LM5019MRX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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