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Texas Instruments LMR51410YFDBVR
- Part No.:
- LMR51410YFDBVR
- Manufacturer:
- Texas Instruments
- Package:
- SOT-23-6
- Datasheet:
-
LMR51410YFDBVR.pdf
- Description:
- IC REG BUCK ADJ 1A SOT23-6
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LMR51410YFDBVR 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 1.1MHz 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 and smart meters.
For engineers reviewing the LMR51410YFDBVR datasheet, LMR51410YFDBVR pinout, LMR51410YFDBVR application, or LMR51410YFDBVR equivalent, key selection considerations include its 1.1MHz FPWM operation, ±1.5% reference voltage tolerance, 80ns minimum on-time, hiccup-mode short-circuit protection, and -40°C to 150°C junction temperature range - all critical for stable, compact, and safety-capable industrial power designs.
Technical Context
The LMR51410YFDBVR employs fixed-frequency peak-current mode control with internal slope compensation, enabling stable regulation across wide input/output ranges without external compensation. Its FPWM operation maintains constant 1.1MHz switching regardless of load, ensuring predictable EMI behavior and tight output voltage regulation down to zero load.
It integrates bootstrap gate drive for the high-side NMOS, uses valley-current sensing for short-circuit protection, and implements frequency foldback below ~200kHz when minimum on- or off-time limits are reached - extending effective duty cycle to support low-VIN dropout conditions while preserving regulation integrity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 42V - supports unregulated industrial rails including 24V and 36V systems with 50V transient tolerance. |
| Output Current | 1A continuous - sufficient for powering microcontrollers, I/O drivers, and isolated interface ICs in compact industrial modules. |
| Switching Frequency | 1.1MHz (fixed, FPWM) - enables use of sub-2.2µH inductors and reduces output filter size versus 400kHz variants. |
| Reference Voltage | 0.8V ±1.5% - ensures ≤±24mV error at feedback node, supporting accurate adjustable VOUT from 0.8V to 28V. |
| Min ON Time | 80ns - allows ≥27:1 step-down ratio at 1.1MHz (e.g., 24V→0.89V), critical for high-VIN, low-VOUT applications. |
| Junction Temp Range | –40°C to +150°C - qualified for under-hood, motor-control, and factory-floor environments without derating. |
| Thermal Resistance | RθJA = 147.8°C/W (SOT-23-6) - requires minimal copper area for 1A operation at ambient ≤85°C. |
Pinout & Package
SOT-23-6 (DBV) package: 2.90mm × 2.80mm footprint, thermally enhanced with exposed pad (not electrically connected), compatible with standard reflow profiles and automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CB | Bootstrap capacitor connection | Connects 100nF X7R ceramic cap to SW; supplies gate drive voltage for integrated high-side MOSFET. |
| GND | Power ground | Common return for internal low-side FET source, CIN, COUT; must be short, low-inductance path to minimize noise. |
| FB | Feedback input | Monitors resistor-divider output voltage; internal 0.8V reference sets VOUT = 0.8V × (1 + RFBB/RFBT). |
| EN | Precision enable | Logic-controlled startup: 1.227V typical turn-on threshold; supports system UVLO via external resistor divider. |
| VIN | Input supply | Connects to 4–42V rail and local 10µF+ ceramic bypass cap; powers internal bias LDO and high-side driver. |
| SW | Switching node | Drives external power inductor; connects internally to drain of low-side FET and source of high-side FET. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated synchronous rectification | Eliminates external Schottky diode; improves full-load efficiency by ≥5% vs. asynchronous buck at 12V→5V/1A. |
| Internal compensation | Reduces BOM count to only 4 external components (CIN, COUT, L, FB divider); accelerates design validation. |
| Hiccup-mode short-circuit protection | Shuts down for 150ms after 256 consecutive overcurrent cycles - limits average power dissipation during sustained faults. |
| Monotonic start-up with prebiased output | Prevents reverse current flow into powered outputs during hot-plug or brownout recovery - avoids system latch-up. |
| Input transient protection to 50V | Withstands 50V/10ns transients without latch-up or damage - meets IEC 61000-4-4 Level 3 requirements without add-on TVS. |
Applications
| PLC Digital I/O Power | Smart Meter MCU Supply |
|---|---|
Use Scenario: Powers 3.3V or 5V digital logic and isolation interfaces in programmable logic controller backplanes with 24V field bus input. IC Role / Device Role / Timing Role: Primary non-isolated point-of-load regulator converting 24V bus to stable 3.3V for ARM Cortex-M7 MCU and RS-485 transceivers. Use Value: 1.1MHz FPWM operation minimizes conducted EMI near sensitive analog sensor inputs; 150°C rating enables placement near heat-generating I/O modules. |
Use Scenario: Supplies 3.3V to metrology SoC and secure element in ANSI C12.22-compliant electricity meters with battery backup. IC Role / Device Role / Timing Role: Always-on buck converter maintaining regulated output during AC mains dropout, enabled via precision UVLO on EN pin. Use Value: 80ns min on-time supports 24V→3.3V conversion at full load without frequency foldback; ±1.5% VREF ensures ADC reference stability across temperature. |
| Industrial HMI Display Backlight | Factory Automation Sensor Node |
Use Scenario: Generates 5V/1A for LED driver ICs powering 7-inch TFT-LCD displays in harsh factory environments. IC Role / Device Role / Timing Role: High-efficiency, low-noise intermediate rail generator upstream of boost-based LED current sources. Use Value: FPWM mode eliminates audible coil whine at light loads; 42V max input accommodates 36V PoE++ or 24V DC bus surges. |
Use Scenario: Powers wireless sensor nodes (BLE/Wi-Fi SoC + analog front-end) deployed in dusty, vibration-prone machinery enclosures. IC Role / Device Role / Timing Role: Compact, robust DC/DC stage converting wide-range 12–36V industrial supply to 3.3V for ultra-low-power sleep/wake cycles. Use Value: 1A capability supports burst transmit peaks; monotonic start-up prevents data corruption during cold restart after extended storage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR51410YDBVR | Same 1A/1.1MHz specs but PFM mode instead of FPWM - 20–30% higher light-load efficiency, variable frequency. | Better suited for battery-powered or energy-harvesting nodes where quiescent current <40µA matters more than EMI control. | Select YDBVR if light-load efficiency dominates; select YFDBVR if constant frequency, low ripple, and EMI predictability are required. |
| LMR54410RTER | Pin-compatible 1A buck with 2.1MHz switching, lower RDS(on) (0.45Ω HS / 0.22Ω LS), and integrated soft-start timer. | Enables smaller 1.0µH inductors and supports higher ambient temps (TJ = 150°C same, but better thermal performance). | Choose LMR54410RTER for space-constrained designs needing >2MHz operation or improved thermal margin at full 1A load. |
Compared with LMR51410YDBVR and LMR54410RTER, the LMR51410YFDBVR uniquely balances 1.1MHz FPWM stability, SOT-23-6 compactness, and industrial-grade ruggedness - making it optimal for cost-sensitive, EMI-regulated, and thermally constrained industrial power rails where layout simplicity and proven reliability are prioritized over ultra-high frequency or lowest quiescent current.
Availability
LMR51410YFDBVR is available at Aetrix Electronics and suitable for PLC digital I/O power, smart meter MCU supply, and industrial HMI display backlighting requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for LMR51410YFDBVR 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 qualification and automotive AEC-Q100 experience.
The LMR514xx family was developed specifically for rugged, space-constrained industrial power conversion - emphasizing wide VIN, high temperature operation, functional safety readiness, and ease of use through integration and internal compensation.
FAQ
What is the maximum input voltage the LMR51410YFDBVR can withstand during transients?
The LMR51410YFDBVR supports input transients up to 50V for durations less than 10ns, as specified in its Absolute Maximum Ratings. This transient robustness eliminates the need for external TVS diodes in many industrial 24V and 36V systems, simplifying protection circuitry while maintaining reliability under load-dump or inductive-switching events.
Does the LMR51410YFDBVR require an external bootstrap capacitor, and what value is recommended?
Yes, the LMR51410YFDBVR requires a 100nF ceramic capacitor (X7R or X5R dielectric, ≥16V rating) between the CB and SW pins to sustain high-side gate drive. This capacitor is refreshed during low-side conduction and is essential for proper MOSFET switching; omitting it causes immediate failure to regulate or excessive thermal stress on the internal driver.
Can the LMR51410YFDBVR operate with a prebiased output, and how does it behave during startup?
Yes, the LMR51410YFDBVR features monotonic start-up with prebiased output support. When enabled into a powered output rail, it avoids reverse current flow by controlling high-side turn-on timing - preventing damage to downstream circuits and ensuring clean, glitch-free power sequencing in multi-rail industrial systems.
What is the purpose of the hiccup-mode short-circuit protection in the LMR51410YFDBVR?
The hiccup-mode protection in the LMR51410YFDBVR activates after 256 consecutive current-limit cycles, shutting down the device for 150ms before retrying. This limits average power dissipation during sustained shorts - protecting both the LMR51410YFDBVR and PCB traces from thermal damage while allowing automatic recovery once the fault is cleared.
How does the LMR51410YFDBVR's FPWM mode differ from its PFM counterpart in practical design terms?
The LMR51410YFDBVR's FPWM mode maintains strict 1.1MHz switching across all loads, ensuring consistent EMI profile, minimal output voltage ripple (<15mVpp at 1A), and predictable loop response - unlike PFM variants that vary frequency at light loads, potentially interfering with sensitive analog or RF sections in the same system.
LMR51410YFDBVR 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:
- 1.1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-6
LMR51410YFDBVR FAQ
1.How can I place an order for LMR51410YFDBVR through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR51410YFDBVR 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 LMR51410YFDBVR reliable?
The price and inventory of LMR51410YFDBVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR51410YFDBVR is usually 5 days.
3.What payment methods are accepted for LMR51410YFDBVR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR51410YFDBVR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR51410YFDBVR?
LMR51410YFDBVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR51410YFDBVR 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 LMR51410YFDBVR?
For technical support, including LMR51410YFDBVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR51410YFDBVR requirements.
6.How does Aetrix verify that LMR51410YFDBVR is sourced from the original manufacturer or authorized distributors?
All LMR51410YFDBVR 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 LMR51410YFDBVR meets industry standards.
7.What is the process for return or replacement of LMR51410YFDBVR?
All LMR51410YFDBVR units undergo pre-shipment inspection (PSI). If there is an issue with LMR51410YFDBVR, 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 LMR51410YFDBVR part is unused and in its original packaging.
Return procedure for LMR51410YFDBVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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