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Texas Instruments LMR50410XFDBVR
- Part No.:
- LMR50410XFDBVR
- Manufacturer:
- Texas Instruments
- Package:
- SOT-23-6
- Datasheet:
-
LMR50410XFDBVR.pdf
- Description:
- IC REG BUCK ADJ 1A SOT23-6
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LMR50410XFDBVR 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, fixed 700-kHz switching frequency, ±1% reference voltage accuracy, and FPWM mode for constant-frequency operation and low output ripple. It serves as a primary wide-VIN power supply in industrial control systems requiring robust thermal performance (–40°C to 150°C junction) and reliable short-circuit protection.
For engineers reviewing the LMR50410XFDBVR datasheet, LMR50410XFDBVR pinout, LMR50410XFDBVR application, or LMR50410XFDBVR equivalent, key selection considerations include its FPWM-only operation (vs. PFM variants), SOT-23-6 package constraints, internal compensation eliminating external compensation networks, monotonic start-up with pre-biased output, and precision enable with adjustable UVLO capability.
Technical Context
The LMR50410XFDBVR employs fixed-frequency peak-current mode control with internal slope compensation and fully integrated high-side/low-side MOSFETs (RDS(on) = 450 mΩ / 240 mΩ). Its FPWM operation enforces constant 700-kHz switching across full load, avoiding frequency modulation and ensuring predictable EMI behavior and tight output regulation (±1.5% over temperature and line/load).
It implements frequency foldback below 133 kHz when minimum on-time (60 ns) or off-time (110 ns) limits are reached, extending effective duty cycle range to support ultra-low dropout (e.g., VOUT = 5 V at VIN = 5.2 V) while maintaining regulation - critical for brownout resilience in PLC and smart meter applications.
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 rectified AC supplies without external pre-regulation. |
| Output Current | 1 A continuous - sufficient for powering microcontrollers, I/O drivers, and analog front-ends in compact industrial modules. |
| Switching Frequency | 700 kHz (fixed, FPWM only) - enables use of small, low-profile inductors (e.g., 2.2 µH) and reduces output capacitor size while ensuring stable EMI filtering. |
| Reference Voltage | 1.00 V ±1% - enables precise output setting (e.g., 3.3 V, 5 V, 12 V) via resistor divider with minimal drift over –40°C to 150°C junction temperature. |
| Min. On-Time | 60 ns - allows high step-down ratios (e.g., 36 V → 3.3 V) at high frequency without pulse-skipping artifacts. |
| Junction Temp. Range | –40°C to 150°C - rated for under-hood, factory-floor, or enclosed industrial environments without derating at full load. |
| Duty Cycle Max | 98% - supports ultra-low dropout operation (e.g., VIN = 5.2 V → VOUT = 5 V) with frequency foldback extending effective range further. |
Pinout & Package
SOT-23-6 (DBV) package, 2.90 mm × 1.60 mm body size, thermally enhanced with exposed pad (not electrically connected in standard DBV variant); designed for high-density PCB layouts with minimal trace length requirements between VIN/GND/CB/SW.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CB | Bootstrap capacitor connection | Provides gate drive voltage for internal high-side FET; requires 100-nF ceramic capacitor tied directly to SW pin - critical for reliable high-side conduction at high duty cycles. |
| GND | Power ground | Main return path for input/output capacitors and internal low-side FET; must be connected to system ground with shortest possible trace to minimize noise and thermal resistance. |
| FB | Feedback input | Monitors output voltage via resistor divider; 1.00-V reference sets regulation point; never short to GND - open-loop instability and latch-up may occur. |
| EN | Precision enable | Logic-controlled ON/OFF with 1.1–1.36 V turn-on threshold; supports external UVLO programming via resistor divider - enables system-level power sequencing and battery discharge protection. |
| VIN | Input supply | Primary power input for internal bias LDO and high-side FET; requires local 10-µF ceramic bypass capacitor directly between VIN and GND to suppress high-frequency switching noise. |
| SW | Switch node | Drain of high-side FET and source of low-side FET; connects to power inductor; high dv/dt node requiring tight layout and minimized loop area to reduce EMI and ringing. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated synchronous rectification | Eliminates external Schottky diode, reducing BOM count and conduction losses - improves full-load efficiency by ~5% vs. asynchronous designs. |
| Internal compensation | Removes need for external Type-II/III compensation network - simplifies design, accelerates prototyping, and ensures stability with common ceramic output capacitors (≥22 µF). |
| Monotonic start-up with pre-biased output | Prevents reverse current flow into powered outputs during startup - essential for hot-swap and multi-rail systems where downstream circuitry remains active. |
| Hiccup-mode short-circuit protection | Disables switching during sustained overload, then retries after 135-ms cooldown - prevents thermal runaway and enables self-recovery without manual reset. |
| 98% maximum duty cycle | Supports near-unity conversion ratio (e.g., 5.2 V → 5 V) without external boost assist - extends usable input range in battery-powered applications nearing end-of-discharge. |
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 40 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: 36-V absolute max rating and hiccup-mode protection ensure survival during 40-V load-dump transients; FPWM mode guarantees consistent timing for deterministic I/O sampling. | Use Scenario: Supplies main application processor and metrology ADC in ANSI C12.20-compliant electricity meters with extended temperature operation and long-term reliability requirements. IC Role / Device Role / Timing Role: Core system power supply generating stable 1.8-V and 3.3-V rails from 3.6-V Li-SOCl₂ battery or 12-V auxiliary input. Use Value: ±1% reference and FPWM operation maintain <±0.5% output deviation across –40°C to 70°C ambient - meeting metrology-grade voltage stability specs. |
| Industrial Appliance Control Board | DCS Field Instrumentation |
Use Scenario: Powers motor control logic, display interface, and sensor signal conditioning on washing machine or HVAC control boards exposed to vibration and thermal cycling. IC Role / Device Role / Timing Role: Main 5-V buck converter feeding microcontroller, touch controller, and CAN transceiver. Use Value: SOT-23-6 footprint enables compact placement near load; 150°C junction rating supports sealed enclosure operation without forced airflow or derating. | Use Scenario: Provides isolated 24-V-to-5-V conversion for HART-enabled 4–20-mA loop-powered field instruments in hazardous areas with strict EMC and thermal constraints. IC Role / Device Role / Timing Role: Secondary regulated supply for digital processing unit, HART modem, and precision DACs. Use Value: Fixed 700-kHz FPWM switching enables clean spectral separation from 4–20-mA loop frequencies and HART tones (1.2/2.2 kHz), minimizing interference in analog measurement paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR50410XDBVR | Same SOT-23-6 package and 700-kHz frequency, but operates in PFM mode - variable frequency at light load, higher light-load efficiency, larger output ripple. | Preferred for battery-powered devices prioritizing >10-µA quiescent current and energy harvesting; unsuitable where constant-frequency EMI control is required. | Select LMR50410XDBVR only if light-load efficiency dominates over ripple and EMI predictability. |
| TPS560430DRCT | Pin-compatible SOT-23-6 buck with 700-kHz FPWM, but lower 0.6-A output current, no monotonic start-up, and ±2% reference tolerance. | Acceptable for low-power sensors or auxiliary rails where 1-A capability and precision startup are not needed; lacks hiccup-mode short-circuit recovery. | Choose TPS560430DRCT only for cost-sensitive, sub-0.6-A applications where TI's LMR50410XFDBVR-level robustness is unnecessary. |
Compared with LMR50410XDBVR, the LMR50410XFDBVR trades light-load efficiency for EMI predictability and tighter regulation; compared with TPS560430DRCT, it delivers 67% higher output current, ±1% reference accuracy, and monotonic start-up - making it the sole choice for 1-A industrial loads demanding reliability and precision.
Availability
LMR50410XFDBVR is available at Aetrix Electronics and suitable for PLC digital I/O modules, smart meter MCU supplies, and industrial appliance control boards requiring stable component supply, long-lifecycle availability, and guaranteed traceable sourcing.
Supply support for LMR50410XFDBVR 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 industrial-grade reliability validation and broad automotive/industrial qualification coverage.
The LMR50410XFDBVR belongs to TI's SIMPLE SWITCHER® wide-VIN buck converter family, engineered specifically for ruggedized industrial power conversion where input transients, thermal stress, and long-term uptime outweigh consumer-grade cost or size optimizations.
FAQ
What is the switching frequency mode of the LMR50410XFDBVR?
The LMR50410XFDBVR operates exclusively in forced PWM (FPWM) mode at a fixed 700-kHz switching frequency across all load conditions. Unlike PFM variants, it does not enter discontinuous conduction mode or reduce frequency at light loads - ensuring constant EMI profile, low output voltage ripple, and deterministic timing for sensitive digital loads. This behavior is hard-coded in the device silicon and cannot be altered via external configuration.
Does the LMR50410XFDBVR support pre-biased output startup?
Yes, the LMR50410XFDBVR features monotonic start-up with pre-biased output capability. During startup, it actively prevents reverse current flow into an already-energized output rail - a critical requirement in hot-swap systems and multi-rail power architectures. This function is implemented internally and requires no external components or configuration; it operates reliably across the full –40°C to 150°C junction temperature range.
What is the maximum output voltage achievable with the LMR50410XFDBVR?
The LMR50410XFDBVR supports adjustable output voltages from 1 V to 28 V, limited by the feedback divider ratio and the 98% maximum duty cycle. At minimum input voltage (4 V), the practical maximum output is ~3.92 V; at 36-V input, the device can regulate up to 28 V. Output voltage accuracy is ±1.5% over temperature and line/load for FPWM operation, ensured by the ±1% internal 1.00-V reference and precision enable threshold.
How does the LMR50410XFDBVR handle short-circuit conditions?
The LMR50410XFDBVR responds to sustained short circuits using hiccup-mode protection: it disables switching, waits 135 ms for thermal recovery, then attempts restart. This cycle repeats until fault clears. Unlike latch-off or shutdown-only schemes, hiccup mode prevents thermal runaway while enabling automatic recovery - ideal for inaccessible or maintenance-free industrial deployments. The feature is active across the full –40°C to 150°C operating range and requires no external components.
Is the LMR50410XFDBVR pin-compatible with other TI buck converters?
Yes, the LMR50410XFDBVR is pin-to-pin compatible with the LMR14010A and TPS560430 in the SOT-23-6 (DBV) package. However, functional equivalence is limited: LMR14010A supports higher 40-V input and 1.5-A output but lacks FPWM mode; TPS560430 offers identical FPWM operation but only 0.6-A output and ±2% reference tolerance. Direct substitution requires verification of current, reference, and protection requirements for the target application.
LMR50410XFDBVR 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
LMR50410XFDBVR FAQ
1.How can I place an order for LMR50410XFDBVR through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR50410XFDBVR 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 LMR50410XFDBVR reliable?
The price and inventory of LMR50410XFDBVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR50410XFDBVR is usually 5 days.
3.What payment methods are accepted for LMR50410XFDBVR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR50410XFDBVR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR50410XFDBVR?
LMR50410XFDBVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR50410XFDBVR 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 LMR50410XFDBVR?
For technical support, including LMR50410XFDBVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR50410XFDBVR requirements.
6.How does Aetrix verify that LMR50410XFDBVR is sourced from the original manufacturer or authorized distributors?
All LMR50410XFDBVR 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 LMR50410XFDBVR meets industry standards.
7.What is the process for return or replacement of LMR50410XFDBVR?
All LMR50410XFDBVR units undergo pre-shipment inspection (PSI). If there is an issue with LMR50410XFDBVR, 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 LMR50410XFDBVR part is unused and in its original packaging.
Return procedure for LMR50410XFDBVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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