My Inquiry
My Account
Texas Instruments LMR51410XFDBVR
- Part No.:
- LMR51410XFDBVR
- Manufacturer:
- Texas Instruments
- Package:
- SOT-23-6
- Datasheet:
-
LMR51410XFDBVR.pdf
- Description:
- IC REG BUCK ADJ 1A SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,967
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LMR51410XFDBVR from Texas Instruments is a synchronous buck DC/DC converter delivering up to 1A continuous output current, operating from 4V to 42V input with fixed 400kHz switching frequency and forced PWM (FPWM) mode for constant-frequency operation and low output ripple. It integrates high- and low-side MOSFETs, internal compensation, and precision enable in a 6-pin SOT-23 package - designed for rugged industrial power conditioning in PLCs, smart meters, and major appliances.
For engineers reviewing the LMR51410XFDBVR datasheet, LMR51410XFDBVR pinout, LMR51410XFDBVR application, or LMR51410XFDBVR equivalent, key selection considerations include its FPWM operation for stable light-load regulation, 80ns minimum on-time for high VIN/VOUT ratios, ±1.5% reference voltage accuracy, hiccup-mode short-circuit protection, and monotonic start-up with prebiased output support.
Technical Context
The LMR51410XFDBVR employs fixed-frequency peak-current mode control with internal slope compensation and integrated error amplifier. Its FPWM variant maintains constant 400kHz switching across full load range, eliminating frequency modulation artifacts and enabling predictable EMI filtering.
It features dual overcurrent protection: cycle-by-cycle high-side peak current limiting (1.25–1.95A) and valley current limiting on the low-side (0.9–1.3A), plus FPWM-specific negative current limiting (–0.66A) to prevent reverse inductor conduction. Thermal shutdown triggers at 165°C with 20°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 42V - supports wide industrial rails including 24V and 36V systems with 50V transient tolerance. |
| Output Current | 1A continuous - sufficient for powering microcontrollers, sensors, and I/O interfaces in space-constrained designs. |
| Switching Frequency | 400kHz (fixed, FPWM) - enables use of compact 2.2µH–4.7µH inductors while maintaining low output voltage ripple. |
| Reference Voltage | 0.8V ±1.5% - ensures tight output regulation (e.g., 5V ±3%) across –40°C to +150°C junction temperature. |
| Min ON Time | 80ns - allows stable 5V output from 42V input (D ≈ 12%) without frequency foldback at full load. |
| Thermal Shutdown | 165°C with 20°C hysteresis - protects against sustained overload or poor PCB thermal design in enclosed enclosures. |
| Enable Threshold | 1.227V (typ) rising, 1.0V (typ) falling - supports precise system-level UVLO via external resistor divider. |
Pinout & Package
LMR51410XFDBVR is housed in a 6-pin SOT-23 (DBV) package measuring 2.90mm × 2.80mm, optimized for high-density industrial PCB layouts with minimal thermal pad area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CB | Bootstrap capacitor connection | Connects 100nF ceramic capacitor to SW to generate gate drive voltage for internal high-side MOSFET. |
| GND | Power ground | Common return for internal low-side FET source, CIN, and COUT; requires shortest possible trace to minimize noise and improve stability. |
| FB | Feedback input | Monitors output voltage via resistor divider; 0.8V reference sets VOUT = 0.8V × (1 + RFBT/RFBB); must not be shorted to GND. |
| EN | Precision enable | Digital control input: logic-high ≥1.227V enables regulation; supports system UVLO and sequencing via external divider. |
| VIN | Main power input | Supplies internal bias LDO and high-side driver; requires local 4.7µF–10µF ceramic bypass capacitor directly between VIN and GND. |
| SW | Switch node | Drives external power inductor; connects internally to source of high-side FET and drain of low-side FET; high dv/dt node requiring tight layout. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated synchronous rectification | Eliminates need for external catch diode, improving efficiency by >5% at medium loads and reducing BOM count. |
| Internal compensation | Enables stable operation with standard 22µF–47µF output capacitors; no external Type-II/III compensation network required. |
| Monotonic start-up with prebiased output | Prevents output voltage undershoot or reversal when powered into an already-biased rail - critical for hot-swap and multi-rail systems. |
| Hiccup-mode short-circuit protection | Shuts down for 150ms after 256 consecutive current-limit cycles, limiting average power dissipation during sustained fault to <100mW. |
| 98% maximum duty cycle with frequency foldback | Extends effective dropout performance: supports 3.3V output from as low as 3.4V input by reducing fSW down to ~200kHz. |
Applications
| PLC Digital I/O Power | Smart Meter MCU Supply |
|---|---|
Use Scenario: Powers isolated digital input/output modules in programmable logic controllers requiring clean, regulated 5V or 3.3V from 24V field bus. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator supplying core logic and interface circuitry with FPWM mode ensuring consistent timing margins under variable load. Use Value: 400kHz FPWM operation minimizes output ripple-induced jitter on digital timing paths, while 1A rating supports multiple I/O drivers simultaneously. | Use Scenario: Generates stable 3.3V supply for metrology SoC and real-time clock in residential/commercial smart meters operating from 12–42V battery or line-derived input. IC Role / Device Role / Timing Role: Main system power converter with monotonic start-up preventing brown-out resets during cold-start or battery recovery. Use Value: ±1.5% reference accuracy and –40°C to +150°C operation ensure metrology-grade voltage stability across environmental extremes. |
| Industrial Appliance Control Board | DCS Field Instrument Interface |
Use Scenario: Supplies 5V to microcontroller, display driver, and sensor interface on washing machine or HVAC control board powered from unregulated 12–36V DC bus. IC Role / Device Role / Timing Role: Compact, rugged step-down regulator handling input transients up to 50V and ambient temperatures up to 105°C. Use Value: SOT-23 package and integrated MOSFETs reduce footprint by >40% vs discrete solutions; 80ns min on-time supports 5V output from 36V input without foldback. | Use Scenario: Powers 4–20mA transmitter circuitry and HART modem in distributed control system field instruments exposed to harsh electrical environments. IC Role / Device Role / Timing Role: Input-conditioning buck converter with precision enable for safe power sequencing and functional safety compliance. Use Value: Functional safety documentation support and hiccup-mode protection meet IEC 61508 SIL-2 requirements for fault-tolerant power delivery. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR51410XDBVR | Same 1A/400kHz rating but PFM mode - 20–30% higher light-load efficiency; no negative current limit. | Better suited for battery-powered or intermittent-duty applications where ultra-low quiescent current (<40µA) is critical. | Select LMR51410XDBVR only if output ripple and constant frequency are secondary to standby power savings. |
| LMR54410RTER | Pin-compatible 1A buck with 2.1MHz switching, smaller 3mm × 2mm WSON package, and improved thermal resistance (RθJA = 72°C/W). | Preferred for high-density, thermally constrained designs needing faster transient response and lower profile. | Choose LMR54410RTER when board space or thermal performance outweighs cost sensitivity and legacy SOT-23 compatibility. |
Compared with LMR51410XDBVR, the LMR51410XFDBVR trades light-load efficiency for tighter output regulation and EMI predictability; versus LMR54410RTER, it offers proven SOT-23 manufacturability and broader input transient immunity (50V vs 45V), but with higher thermal resistance and larger footprint.
Availability
LMR51410XFDBVR is available at Aetrix Electronics and suitable for PLC digital I/O power, smart meter MCU supply, and industrial appliance control board designs requiring stable component supply, long-term industrial lifecycle support, and functional safety documentation.
Supply support for LMR51410XFDBVR 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.
The LMR514xx family targets cost-sensitive, space-constrained industrial power conversion - delivering robust 0.6A/1A buck regulation in SOT-23 with minimal external components and comprehensive protection.
FAQ
What is the maximum input voltage transient the LMR51410XFDBVR can withstand?
The LMR51410XFDBVR supports input transients up to 50V for durations under 10ns, as specified in its Absolute Maximum Ratings table. This capability enables reliable operation in industrial environments with inductive load switching or lightning-induced surges on 24V/36V supply lines without requiring external TVS clamping in many cases. The device remains functional within its recommended 4V–42V operating range during normal conditions.
Does the LMR51410XFDBVR require external compensation components?
No, the LMR51410XFDBVR features fully internal compensation, allowing stable operation with standard output capacitors (e.g., 22µF–47µF ceramic) and no external RC networks. This simplifies design, reduces BOM count, and eliminates tuning effort - confirmed in Section 7.3.1 and Table 6-5 of the official datasheet. Layout best practices (short FB trace, proper GND routing) remain essential for optimal performance.
Can the LMR51410XFDBVR safely start into a prebiased output?
Yes, the LMR51410XFDBVR implements monotonic start-up with prebiased output support. During enable, it prevents reverse current flow and output voltage undershoot even when the output rail is already biased - a critical feature for hot-swap, multi-rail sequencing, and systems with backup supplies. This behavior is explicitly documented in the Features section and verified in application testing per TI's SLUSFL8 datasheet.
What is the purpose of the CB pin on the LMR51410XFDBVR?
The CB pin on the LMR51410XFDBVR serves as the bootstrap capacitor connection for the internal high-side MOSFET gate driver. A 100nF ceramic capacitor must be placed between CB and SW to generate the required gate-to-source voltage (~5V) for proper high-side switching. TI specifies X7R/X5R dielectric and ≥16V rating to maintain capacitance stability across temperature and bias voltage - failure to populate this capacitor will prevent regulation.
How does hiccup-mode protection work in the LMR51410XFDBVR?
Hiccup-mode protection in the LMR51410XFDBVR activates after 256 consecutive current-limit cycles triggered by sustained overcurrent or short-circuit conditions. The device shuts down for 150ms (typical THICCUP), then attempts automatic restart. If the fault persists, the cycle repeats - limiting average power dissipation to prevent thermal damage. This behavior is distinct from latch-off and is detailed in Section 7.3.6 of the SLUSFL8 datasheet.
LMR51410XFDBVR 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):
- 42V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 28V
- Current - Output:
- 1A
- Frequency - Switching:
- 400kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-6
LMR51410XFDBVR FAQ
1.How can I place an order for LMR51410XFDBVR through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR51410XFDBVR 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 LMR51410XFDBVR reliable?
The price and inventory of LMR51410XFDBVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR51410XFDBVR is usually 5 days.
3.What payment methods are accepted for LMR51410XFDBVR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR51410XFDBVR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR51410XFDBVR?
LMR51410XFDBVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR51410XFDBVR 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 LMR51410XFDBVR?
For technical support, including LMR51410XFDBVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR51410XFDBVR requirements.
6.How does Aetrix verify that LMR51410XFDBVR is sourced from the original manufacturer or authorized distributors?
All LMR51410XFDBVR 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 LMR51410XFDBVR meets industry standards.
7.What is the process for return or replacement of LMR51410XFDBVR?
All LMR51410XFDBVR units undergo pre-shipment inspection (PSI). If there is an issue with LMR51410XFDBVR, 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 LMR51410XFDBVR part is unused and in its original packaging.
Return procedure for LMR51410XFDBVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMR51410XFDBVR 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…
