My Inquiry
My Account
Texas Instruments LM5019MR/NOPB
- Part No.:
- LM5019MR/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM5019MR/NOPB.pdf
- Description:
- IC REG BUCK ADJ 100MA 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:426
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM5019MR/NOPB from Texas Instruments is a 100-V, 100-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 7.5–100-V input range-designed for isolated bias supplies in telecom and automotive power systems.
For engineers reviewing the LM5019MR/NOPB datasheet, LM5019MR/NOPB pinout, LM5019MR/NOPB application, or LM5019MR/NOPB equivalent, key selection criteria include its no-loop-compensation COT architecture, intelligent peak current limit (240 mA typ), adjustable switching frequency up to 1 MHz, thermal shutdown (165°C), and dual-package availability (SO PowerPAD-8 and WSON-8).
Technical Context
The LM5019MR/NOPB implements a constant-on-time control scheme where on-time is inversely proportional to VIN via external RON, enabling near-constant frequency across 7.5–100 V input and eliminating loop compensation. Its internal 7.6-V VCC regulator powers gate drivers and logic, with bootstrap charging via internal diode between VCC and BST pins.
It features dual-level undervoltage lockout (UVLO threshold = 1.225 V, shutdown at 0.66 V), an overvoltage comparator (1.62 V trip), and a forced off-time generator that scales with FB voltage and VIN to deliver intelligent short-circuit protection-ensuring stable operation under load transients and fault conditions without foldback degradation.
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 continuous - sufficient for isolated auxiliary rails in smart meters and industrial controllers. |
| Feedback Reference | 1.225 V ±2% - enables precise output regulation down to ~1.23 V 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 | 240 mA typical - provides robust overload protection while maintaining fast transient recovery. |
| Thermal Shutdown Threshold | 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 circuitry and gate drivers; disables when externally supplied 8.55–13 V is applied. |
Pinout & Package
LM5019MR/NOPB is packaged in an 8-pin SO PowerPAD (DDA) with exposed thermal pad soldered to RTN. The package measures 4.89 mm × 3.90 mm and requires connection of the exposed pad to system ground for optimal thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 RTN | Ground reference | Primary return path for all internal circuits and exposed thermal pad; must be low-impedance connection to PCB ground plane. |
| 2 VIN | Main input supply | Accepts 7.5–100 V DC; powers internal VCC regulator and high-voltage logic; connects to bulk input capacitor. |
| 3 UVLO | Undervoltage detection input | Resistor-divider programmable start-up threshold; pulls below 0.66 V to force shutdown; enables hysteresis via internal 20-μA current source. |
| 4 RON | On-time programming | Resistor-to-VIN sets minimum on-time (e.g., 250 ns at 48 V with 100 kΩ); ensures stable COT operation across input range. |
| 5 FB | Feedback input | Compares against 1.225-V internal reference; requires ≥25 mV ripple for stable COT regulation; determines output voltage via RFB1/RFB2 divider. |
| 6 VCC | Bias supply output | 7.6-V regulated output powering gate drivers and control logic; requires 1.0-μF ceramic decoupling capacitor. |
| 7 BST | Bootstrap supply | Connects to SW via 0.01-μF ceramic capacitor; replenished by internal diode from VCC during SW low phase. |
| 8 SW | Power switching node | Drives external inductor; connects to BST capacitor and output filter; handles full switching current and voltage transitions. |
Key Features
| Feature | Design Value |
|---|---|
| No external loop compensation required | Constant-on-time control eliminates need for compensation network-reducing BOM count and layout sensitivity. |
| Integrated synchronous rectification | On-chip low-side N-MOSFET replaces Schottky diode-improving efficiency and eliminating reverse recovery losses. |
| Intelligent peak current limiting | Off-time scales with FB voltage and VIN-minimizing foldback during moderate overloads while ensuring safe short-circuit response. |
| Fly-Buck™ topology support | Capable of isolated output generation using coupled inductor-enabling compact, low-cost isolated bias without optocouplers or transformers. |
| Programmable undervoltage lockout | Independent UVLO threshold and hysteresis set via external resistor divider-allowing custom brown-in/brown-out behavior. |
Applications
| Smart Power Meters | Telecom Line Cards |
|---|---|
Use Scenario: Generating isolated 3.3-V or 5-V auxiliary rail from 48-V telecom bus for metrology ICs and communication interfaces. IC Role / Device Role / Timing Role: Primary synchronous buck/Fly-Buck controller providing regulated, isolated bias with minimal external components. Use Value: Eliminates need for separate isolated DC/DC module-reducing board area and cost while meeting IEC 62053 creepage requirements via transformerless isolation. |
Use Scenario: Supplying 12-V bias to hot-swap controllers and PMBus supervisors on line cards operating from -48-V DC distribution. IC Role / Device Role / Timing Role: High-input-voltage synchronous regulator delivering stable output despite wide input transients and load steps. Use Value: Achieves >85% efficiency at 100-mA load with ultra-fast transient response-maintaining supervisor uptime during sudden current surges. |
| Automotive Body Control Modules | Industrial PLC I/O Isolation |
Use Scenario: Deriving 5-V isolated supply from 12–24-V battery rail for CAN transceivers and sensor signal conditioning in BCMs. IC Role / Device Role / Timing Role: Fly-Buck™ converter generating galvanically isolated output without secondary-side feedback or optocoupler. Use Value: Meets AEC-Q100 stress test requirements with 100-V absolute max rating-withstanding load-dump transients up to 60 V. |
Use Scenario: Providing 3.3-V isolated power to analog input front-ends in modular PLC backplanes with 24-V field-side supply. IC Role / Device Role / Timing Role: Compact, self-contained isolated bias generator supporting multiple I/O channels with shared transformer winding. Use Value: Enables channel-to-channel isolation up to 2.5 kVRMS using single Fly-Buck inductor-reducing component count versus discrete isolated modules. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck/Fly-Buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5017MR/NOPB | Same COT architecture but rated for 100-V input and 600-mA output; larger SO PowerPAD-16 package. | Supports higher output current and includes soft-start pin; not drop-in compatible due to different pin count and layout. | Select when >100-mA load or programmable soft-start is required; requires PCB redesign. |
| LM5160QPWPRQ1 | Automotive-grade 65-V, 600-mA buck regulator with integrated high-side FET only; requires external sync FET. | Includes spread-spectrum clocking and enhanced EMI performance; lacks Fly-Buck capability and integrated low-side switch. | Choose for AEC-Q100-compliant designs needing higher current and lower EMI; adds external MOSFET and gate driver complexity. |
Compared with LM5019MR/NOPB, LM5017MR/NOPB delivers 6× higher output current but requires larger layout and lacks pin compatibility, while LM5160QPWPRQ1 offers automotive qualification and EMI reduction at the cost of added external components and no integrated low-side switch or Fly-Buck support.
Availability
LM5019MR/NOPB is available at Aetrix Electronics and suitable for smart metering, telecom power conversion, and automotive body electronics requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LM5019MR/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-voltage DC/DC conversion and automotive-grade reliability.
The LM5019MR/NOPB belongs to TI's high-voltage buck regulator product line, engineered specifically for isolated and non-isolated step-down applications in harsh environments-where wide input range, integrated power stages, and robust protection are critical.
FAQ
What is the maximum input voltage rating for LM5019MR/NOPB?
The LM5019MR/NOPB has an absolute maximum input voltage rating of 100 V across VIN to RTN, with recommended operating range from 7.5 V to 100 V. This enables direct interface with 48-V telecom systems and withstands automotive load-dump transients up to 60 V without external clamping. Exceeding 100 V risks permanent damage per Section 6.1 of the SNVS788H datasheet.
Does LM5019MR/NOPB support Fly-Buck™ topology out of the box?
Yes, LM5019MR/NOPB natively supports Fly-Buck™ operation without firmware or external control logic. Its integrated synchronous rectifier, constant-on-time control, and ability to regulate based on primary-side feedback enable isolated output generation using a coupled inductor-eliminating the need for optocouplers or secondary-side regulators in auxiliary rail designs.
What is the purpose of the RON pin on LM5019MR/NOPB?
The RON pin on LM5019MR/NOPB sets the minimum on-time duration via an external resistor to VIN, directly determining switching frequency and stability. For example, a 100-kΩ resistor yields ~250 ns on-time at 48 V input. This resistor also ensures the on-time remains above 100 ns at 100 V-preventing control instability and guaranteeing reliable COT operation across the full input range.
How does LM5019MR/NOPB handle thermal overload conditions?
LM5019MR/NOPB incorporates a dedicated thermal shutdown circuit that disables both the buck switch and internal VCC regulator when junction temperature reaches 165°C (typical), with 20°C hysteresis. Recovery occurs automatically once die temperature falls below 145°C. This protects against catastrophic failure during sustained overloads or inadequate heatsinking-verified per Section 6.5 Thermal Shutdown specifications.
Can LM5019MR/NOPB operate without an external bootstrap capacitor?
No, LM5019MR/NOPB requires a 0.01-μF ceramic capacitor between BST and SW pins for proper high-side gate drive operation. This capacitor is charged through the internal VCC-to-BST diode during SW low time. Omitting it causes gate drive failure, resulting in no switching or erratic regulation-confirmed in Section 5 Pin Functions and Figure 5-1 of the SNVS788H datasheet.
LM5019MR/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):
- 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
LM5019MR/NOPB FAQ
1.How can I place an order for LM5019MR/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5019MR/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 LM5019MR/NOPB reliable?
The price and inventory of LM5019MR/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5019MR/NOPB is usually 5 days.
3.What payment methods are accepted for LM5019MR/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5019MR/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5019MR/NOPB?
LM5019MR/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5019MR/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 LM5019MR/NOPB?
For technical support, including LM5019MR/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5019MR/NOPB requirements.
6.How does Aetrix verify that LM5019MR/NOPB is sourced from the original manufacturer or authorized distributors?
All LM5019MR/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 LM5019MR/NOPB meets industry standards.
7.What is the process for return or replacement of LM5019MR/NOPB?
All LM5019MR/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM5019MR/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 LM5019MR/NOPB part is unused and in its original packaging.
Return procedure for LM5019MR/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM5019MR/NOPB Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
