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Texas Instruments LMR50410XDBVR
- Part No.:
- LMR50410XDBVR
- Manufacturer:
- Texas Instruments
- Package:
- SOT-23-6
- Datasheet:
-
LMR50410XDBVR.pdf
- Description:
- IC REG BUCK ADJ 1A SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,848
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Product details
Overview
LMR50410XDBVR from Texas Instruments is a synchronous buck DC-DC converter delivering up to 1-A continuous output current with 4-V to 36-V input range, 700-kHz fixed switching frequency, ±1% reference voltage accuracy, and monotonic start-up into pre-biased outputs - deployed in industrial PLCs, smart meters, and major appliances for wide-VIN power conditioning.
For engineers reviewing the LMR50410XDBVR datasheet, LMR50410XDBVR pinout, LMR50410XDBVR application, or LMR50410XDBVR equivalent, key selection considerations include PFM-mode light-load efficiency, 60-ns minimum on-time for high VIN-to-VOUT ratios, SOT-23-6 thermal performance (RθJB = 31°C/W), hiccup-mode short-circuit protection, and precision enable with adjustable UVLO.
Technical Context
The LMR50410XDBVR employs fixed-frequency peak-current mode control with internal compensation, enabling stable regulation using minimal external components. Its PFM operation at light load achieves >90% efficiency down to 100 µA output, while FPWM variants (not this part) maintain constant 700-kHz frequency and low ripple across full load.
It integrates synchronous high-side (450 mΩ RDS-ON) and low-side (240 mΩ RDS-ON) MOSFETs, uses bootstrap-driven gate control via CB/SW pins, and implements cycle-by-cycle current limiting with hiccup recovery (135-ms burst interval) and thermal shutdown (170°C trip, 158°C recovery).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4 V to 36 V - supports unregulated industrial rails including 12-V, 24-V, and 36-V battery or bus supplies without external pre-regulation. |
| Output Current | 1 A continuous - sufficient for powering microcontrollers, sensors, and I/O interfaces in space-constrained industrial modules. |
| Switching Frequency | 700 kHz (fixed) - enables use of compact 1–2.2-µH inductors and reduces output capacitor size versus lower-frequency converters. |
| Reference Voltage | 1.0 V ±1% - ensures ≤±2.5% output voltage regulation over temperature and line/load, critical for ADC references and analog circuitry. |
| Min On-Time | 60 ns - allows stable 3.3-V or 5-V output from 36-V input (D ≈ 9.2%) without frequency foldback under light load. |
| Junction Temp Range | –40°C to +150°C - qualified for extended industrial ambient conditions and high-power-density PCB layouts. |
| Duty Cycle Max | 98% - supports ultra-low dropout operation (e.g., 5-V out from 5.1-V in), minimizing heat generation in high-VIN scenarios. |
Pinout & Package
SOT-23-6 package (2.90 mm × 1.60 mm body), thermally enhanced with exposed pad (DBV variant), optimized for manual assembly and reflow-compatible PCB layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CB | Bootstrap capacitor connection | Provides gate drive voltage for internal high-side FET; requires 100-nF ceramic capacitor to SW for reliable 100% duty-cycle operation. |
| GND | Power ground | Common return for internal low-side FET source, CIN, and COUT; must be short, low-inductance path to minimize noise and thermal resistance (RθJB = 31°C/W). |
| FB | Feedback input | Monitors output via resistor divider; 1.0-V reference sets VOUT = 1.0 × (1 + RFBT/RFBB); never short to GND during operation. |
| EN | Enable control | Logic-level input (1.1–1.36 V turn-on threshold); supports system UVLO via external resistor divider or direct tie-to-VIN for self-start. |
| VIN | Main input supply | Connects to input capacitors and internal bias LDO; absolute max 38 V; must be decoupled locally with low-ESR ceramic capacitors. |
| SW | Switch node | Drives external inductor; internally connects high-side drain and low-side source; high dv/dt node requiring tight loop layout and guard ring. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated synchronous rectification | Eliminates external Schottky diode, reducing BOM count and improving full-load efficiency by ~5% versus asynchronous designs. |
| Internal compensation | Removes need for external Type-II/III compensation network, cutting design time and enabling stable operation with diverse output capacitors (ceramic, polymer). |
| Monotonic start-up into pre-biased output | Prevents reverse current flow when powering systems with charged output rails - essential for hot-swap and redundant supply applications. |
| Hiccup-mode short-circuit protection | Shuts down SW node after overcurrent detection, waits 135 ms, then retries - prevents thermal runaway while allowing automatic recovery without system reset. |
| Precision enable with adjustable UVLO | EN pin threshold tolerance (±130 mV hysteresis) and leakage (<200 nA) enable accurate, low-power system sequencing and battery discharge cutoff. |
Applications
| PLC Digital I/O Power | Smart Meter MCU Supply |
|---|---|
Use Scenario: Powers isolated digital input/output modules in programmable logic controllers operating from 24-V DC field buses with transient surges up to 36 V. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator delivering regulated 3.3-V/5-V rail to microcontroller, level shifters, and optocoupler drivers. Use Value: 700-kHz switching and 60-ns min on-time maintain regulation during 24-V bus dips to 5.5 V, while hiccup protection survives sustained output shorts from field wiring faults. | Use Scenario: Supplies metrology SoC and real-time clock in ANSI C12.22-compliant smart electricity meters exposed to wide ambient temperatures (–40°C to +85°C). IC Role / Device Role / Timing Role: Main system power IC converting utility-derived 12-V backup rail to stable 3.3-V for precision ADC and RTC circuits. Use Value: ±1% reference and –40°C to +150°C junction rating ensure <±0.5% output drift over full temperature range, meeting Class 0.2 metering accuracy requirements. |
| Industrial Appliance Control Board | DCS Field Instrument Interface |
Use Scenario: Powers main control board in commercial refrigeration units where input varies between 12-V battery and 24-V PoE-powered backplane. IC Role / Device Role / Timing Role: Single-chip buck solution replacing discrete controller + external MOSFETs for space-constrained front-panel display and sensor interface subsystems. Use Value: SOT-23-6 footprint (2.9 × 1.6 mm) and integrated FETs reduce total solution area by >40% versus controller-based alternatives, easing thermal management in sealed enclosures. | Use Scenario: Provides isolated 5-V auxiliary supply for HART modem and 4–20-mA loop drivers in distributed control system field transmitters mounted in hazardous areas. IC Role / Device Role / Timing Role: Secondary regulated supply derived from primary 24-V loop power, supporting low-noise analog signal conditioning and digital communication. Use Value: PFM efficiency >85% at 100-µA load extends battery life during loop-powered brownout, while 98% max duty cycle sustains 5-V output even as input drops to 5.1 V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR14010A | Same SOT-23-6 pinout, 4–40-V input, 1-A, but 600-kHz switching and no PFM mode - higher light-load quiescent current (250 µA vs. 120 µA). | Lacks monotonic start-up and pre-bias capability; less suitable for hot-swap or redundant supply systems. | Choose when higher input voltage margin (40 V) is required and PFM efficiency is not critical. |
| TPS560430 | Pin-compatible, 4.5–18-V input, 0.6-A output, 1.4-MHz switching - smaller inductor size but lower current and narrower VIN range. | Not rated for >18-V inputs; unsuitable for 24-V/36-V industrial rails or automotive battery-connected systems. | Prefer for cost-sensitive, low-power consumer applications where 18-V max input is acceptable. |
Compared with LMR14010A and TPS560430, the LMR50410XDBVR uniquely balances 36-V input capability, 1-A output, PFM efficiency, and monotonic start-up in the smallest standard package - making it optimal for ruggedized industrial power where input transients, thermal constraints, and reliability under fault conditions are prioritized.
Availability
LMR50410XDBVR is available at Aetrix Electronics and suitable for PLC digital I/O modules, smart meter metrology subsystems, and industrial appliance control boards requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LMR50410XDBVR 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 industrial-grade product validation and broad distribution infrastructure.
The LMR50410XDBVR belongs to TI's SIMPLE SWITCHER® family - engineered specifically for ease-of-use, ruggedness, and small-footprint DC-DC conversion in harsh industrial environments where reliability, thermal resilience, and minimal external components are mandatory.
FAQ
What is the maximum input voltage rating for the LMR50410XDBVR?
The LMR50410XDBVR has an absolute maximum input voltage rating of 38 V, with recommended operating range from 4 V to 36 V. Exceeding 38 V risks permanent damage per Absolute Maximum Ratings. The device maintains regulation across its full 4–36-V range, leveraging frequency foldback below 5.1 V or above 34 V to sustain 98% duty cycle or avoid minimum on-time violation.
Does the LMR50410XDBVR support adjustable output voltage?
Yes, the LMR50410XDBVR supports fully adjustable output voltage from 1 V to 28 V using an external resistor divider on the FB pin. Its precision 1.0-V ±1% internal reference enables accurate setting via Equation VOUT = 1.0 × (1 + RFBT/RFBB). Recommended RFBT values range from 10 kΩ to 100 kΩ, with RFBB selected for 10–100-µA divider current to balance noise immunity and light-load efficiency.
How does the LMR50410XDBVR handle short-circuit conditions?
The LMR50410XDBVR responds to output short circuits with hiccup-mode protection: it disables switching upon current-limit detection, waits 135 ms, then attempts restart. This cycle repeats until the fault clears. Unlike latch-off protection, hiccup mode enables autonomous recovery without system intervention, while limiting average power dissipation to prevent thermal damage during sustained faults.
Can the LMR50410XDBVR start up into a pre-biased output?
Yes, the LMR50410XDBVR features monotonic start-up into pre-biased outputs - meaning it will not force reverse current through the output capacitor when powered on while VOUT is already present. This behavior is enabled by internal control logic that monitors FB voltage during startup and delays high-side switch activation until the output begins rising naturally, preventing potential damage to downstream circuitry.
What thermal performance can be expected from the LMR50410XDBVR in a standard PCB layout?
In a typical 4-layer JEDEC-standard PCB, the LMR50410XDBVR exhibits a junction-to-board thermal resistance (RθJB) of 31°C/W. With proper copper pour under the exposed pad and 2 oz. inner layers, real-world designs achieve ~80°C/W RθJA on 2-layer boards. At 1-A load and 24-V input, junction temperature rise remains within safe limits up to +85°C ambient - validated by thermal shutdown at 170°C and recovery at 158°C.
LMR50410XDBVR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- SOT-23-6
- 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):
- 4V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 1V
- Voltage - Output (Max):
- 28V
- Current - Output:
- 1A
- Frequency - Switching:
- 700kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-6
LMR50410XDBVR FAQ
1.How can I place an order for LMR50410XDBVR through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR50410XDBVR 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 LMR50410XDBVR reliable?
The price and inventory of LMR50410XDBVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR50410XDBVR is usually 5 days.
3.What payment methods are accepted for LMR50410XDBVR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR50410XDBVR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR50410XDBVR?
LMR50410XDBVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR50410XDBVR 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 LMR50410XDBVR?
For technical support, including LMR50410XDBVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR50410XDBVR requirements.
6.How does Aetrix verify that LMR50410XDBVR is sourced from the original manufacturer or authorized distributors?
All LMR50410XDBVR 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 LMR50410XDBVR meets industry standards.
7.What is the process for return or replacement of LMR50410XDBVR?
All LMR50410XDBVR units undergo pre-shipment inspection (PSI). If there is an issue with LMR50410XDBVR, 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 LMR50410XDBVR part is unused and in its original packaging.
Return procedure for LMR50410XDBVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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