My Inquiry
My Account
Texas Instruments LMR51410YDBVR
- Part No.:
- LMR51410YDBVR
- Manufacturer:
- Texas Instruments
- Package:
- SOT-23-6
- Datasheet:
-
LMR51410YDBVR.pdf
- Description:
- IC REG BUCK ADJ 1A SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,832
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LMR51410YDBVR from Texas Instruments is a 1A synchronous buck DC/DC converter in SOT-23-6 package, operating from 4V to 42V input with 1.1MHz fixed-frequency PFM mode, ±1.5% reference accuracy, and integrated high-/low-side MOSFETs for industrial power conditioning in PLCs, smart meters, and major appliances.
For engineers reviewing the LMR51410YDBVR datasheet, LMR51410YDBVR pinout, LMR51410YDBVR application, or LMR51410YDBVR equivalent, key selection factors include its 1.1MHz switching frequency for compact magnetics, 1A continuous output at 150°C junction temperature, hiccup-mode short-circuit protection, monotonic start-up with prebiased output, and precision enable with adjustable UVLO.
Technical Context
The LMR51410YDBVR employs fixed-frequency peak-current mode control with internal compensation, enabling stable regulation using minimal external components. It integrates synchronous rectification with 0.7Ω high-side and 0.36Ω low-side MOSFETs, supports PFM operation for light-load efficiency, and features frequency foldback to extend duty cycle range down to 80ns minimum on-time and 200ns minimum off-time.
Its functional block includes precision enable with 1.227V rising threshold, internal 2.3ms soft-start, 0.8V reference voltage with ±1.5% tolerance over –40°C to 150°C, and comprehensive protection: cycle-by-cycle current limit, thermal shutdown at 165°C, and hiccup-mode response to sustained short circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 42V - supports unregulated industrial rails including 24V and 36V systems without external pre-regulation. |
| Output Current | 1A continuous - delivers full rated load at 150°C junction temperature with appropriate PCB thermal design. |
| Switching Frequency | 1.1MHz (±15%) - enables use of sub-2.2µH inductors and reduces solution footprint versus 400kHz variants. |
| Reference Voltage | 0.8V ±1.5% - ensures tight output regulation across temperature and line/load conditions for adjustable VOUT. |
| Min. On-Time | 80ns - supports high VIN/VOUT ratios (e.g., 42V→3.3V) without requiring frequency foldback in most cases. |
| Thermal Shutdown | 165°C with 20°C hysteresis - protects device during overload or poor heatsinking while allowing recovery after fault removal. |
| Enable Threshold | 1.227V (rising), 1.0V (falling) - enables precise system-level UVLO via external resistor divider for battery or utility supply monitoring. |
Pinout & Package
SOT-23-6 (DBV) package: 2.90mm × 2.80mm footprint, thermally enhanced with exposed pad (not electrically connected), suitable for high-density industrial PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CB | Bootstrap capacitor connection | Connects 100nF ceramic capacitor to SW pin 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 CIN. |
| 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 | Active-high digital control; 1.227V threshold allows system UVLO configuration; must not be left floating. |
| VIN | Input supply | Connects to 4–42V source and input bypass capacitors; powers internal bias LDO and high-side driver circuitry. |
| SW | Switch node | Drives external power inductor; internally connects high-side drain and low-side source; high dv/dt node requiring careful layout. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated synchronous rectification | Eliminates external Schottky diode, reducing BOM count and improving efficiency by up to 8% at 1A vs. asynchronous designs. |
| Internal compensation | Enables stable operation with standard output capacitors (e.g., 22µF X5R) without external Type-II/III compensation network. |
| Monotonic start-up with prebias support | Prevents output voltage undershoot or reverse current when powering into precharged rail-critical for hot-swap and multi-rail sequencing. |
| Hiccup-mode short-circuit protection | Shuts down for 150ms after 256 consecutive current-limit cycles, limiting average power dissipation to <150mW during sustained fault. |
| Input transient protection to 50V | Withstands 50V/10ns transients per JEDEC JESD22-A114, eliminating need for external TVS in 42V-rated industrial environments. |
Applications
| PLC Power Supply | Smart Meter Auxiliary Rail |
|---|---|
Use Scenario: Provides isolated 5V or 3.3V auxiliary power from 24V DC bus in programmable logic controller backplanes. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator delivering 1A at 1.1MHz for microcontroller, I/O drivers, and communication ICs. Use Value: Compact SOT-23-6 footprint fits dense DIN-rail mount PCBs; 150°C operation sustains reliability in enclosed cabinets without forced air. |
Use Scenario: Generates stable 3.3V rail for metrology ADC, RTC, and RF modules in electricity meters exposed to wide ambient temperatures. IC Role / Device Role / Timing Role: Main system regulator with PFM mode maintaining >85% efficiency at 1mA standby load and full regulation at 1A pulse loads. Use Value: ±1.5% reference and monotonic start-up ensure accurate energy measurement calibration; hiccup protection prevents meter lockup during ESD events. |
| Industrial Appliance Control Board | DCS Field Interface Module |
Use Scenario: Powers MCU, display, and sensor interface on washing machine or HVAC control boards with 12–42V battery or rectified AC input. IC Role / Device Role / Timing Role: High-reliability buck converter handling input transients from motor commutation and relay switching. Use Value: 50V transient rating and –40°C to 150°C operation eliminate derating concerns in thermally stressed enclosures near compressors or heating elements. |
Use Scenario: Supplies 5V/1A to analog input/output signal conditioning circuits in distributed control system field modules mounted in hazardous areas. IC Role / Device Role / Timing Role: Regulator with precision enable enabling safe power sequencing before analog front-end activation. Use Value: Adjustable UVLO via EN divider ensures clean power-up only when main 24V loop supply is stable, preventing false analog readings during brownouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR51410XFDBVR | Same 1A/1.1MHz rating but FPWM mode instead of PFM; fixed-frequency operation across full load range. | Better for noise-sensitive analog circuits requiring constant switching frequency and lower output ripple. | Select when low EMI and tight VOUT regulation at light load outweigh peak efficiency needs. |
| LMR54410YDBVR | Pin-compatible 1A buck with 2.1MHz switching, higher efficiency at light load, and improved thermal resistance (RθJA = 110°C/W). | Enables smaller inductors and reduced solution size; better suited for space-constrained portable industrial tools. | Choose when board area is critical and 2.1MHz operation is acceptable for EMI filtering design. |
Compared with LMR51410YDBVR, the LMR51410XFDBVR trades light-load efficiency for constant-frequency stability, while the LMR54410YDBVR offers higher switching frequency and better thermal performance at the cost of different current-sense architecture and layout sensitivity.
Availability
LMR51410YDBVR is available at Aetrix Electronics and suitable for PLC power supplies, smart meter auxiliary rails, and industrial appliance control boards requiring stable component supply with extended temperature capability and transient robustness.
Supply support for LMR51410YDBVR 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 development and automotive qualification expertise.
The LMR514xx family was designed specifically for rugged industrial power conversion-targeting applications needing wide VIN, high temperature operation, and minimal external components in compact packages like SOT-23.
FAQ
What is the maximum input voltage transient the LMR51410YDBVR can withstand?
The LMR51410YDBVR is rated for 50V input transients lasting less than 10ns, as specified in its Absolute Maximum Ratings table. This capability eliminates the need for external TVS diodes in typical 24V industrial systems where load-dump or inductive kick events occur. The device maintains functionality after such transients without latch-up or parameter shift, provided the steady-state VIN remains within 4V–42V.
Does the LMR51410YDBVR require an external bootstrap capacitor?
Yes, the LMR51410YDBVR requires a 100nF ceramic capacitor (X7R/X5R, 16V rating) connected between the CB and SW pins. This capacitor provides gate drive voltage for the internal high-side MOSFET during each switching cycle. Omitting it causes immediate failure of high-side conduction, resulting in no output regulation. TI specifies this as mandatory in the Pin Functions table and Layout section of the datasheet.
Can the LMR51410YDBVR operate with a prebiased output voltage?
Yes, the LMR51410YDBVR supports monotonic start-up into a prebiased output, meaning it will not force reverse current through the output capacitor when enabled. This behavior is confirmed in the Features list and Functional Description sections. It is essential for hot-swap applications and multi-rail systems where downstream circuitry may already be powered.
What is the purpose of the FB pin's 0.8V reference voltage tolerance specification?
The ±1.5% tolerance on the LMR51410YDBVR's 0.8V internal reference directly determines achievable output voltage accuracy when using a resistor divider. For example, with a 5V output (RFBT/RFBB = 5.25), this translates to ±75mV total error budget before accounting for resistor tolerance and temperature drift-critical for applications like metrology in smart meters where absolute voltage accuracy affects measurement integrity.
How does hiccup-mode protection work in the LMR51410YDBVR during a sustained short circuit?
When the LMR51410YDBVR detects 256 consecutive current-limit cycles-indicating a sustained short-the device enters hiccup mode: it shuts down for 150ms (typical), then attempts restart. If the fault persists, the cycle repeats. This limits average power dissipation to under 150mW, preventing thermal runaway. The behavior is documented in Section 7.3.6 and verified in Electrical Characteristics Table 6-5.
LMR51410YDBVR 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
LMR51410YDBVR FAQ
1.How can I place an order for LMR51410YDBVR through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR51410YDBVR 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 LMR51410YDBVR reliable?
The price and inventory of LMR51410YDBVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR51410YDBVR is usually 5 days.
3.What payment methods are accepted for LMR51410YDBVR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR51410YDBVR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR51410YDBVR?
LMR51410YDBVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR51410YDBVR 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 LMR51410YDBVR?
For technical support, including LMR51410YDBVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR51410YDBVR requirements.
6.How does Aetrix verify that LMR51410YDBVR is sourced from the original manufacturer or authorized distributors?
All LMR51410YDBVR 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 LMR51410YDBVR meets industry standards.
7.What is the process for return or replacement of LMR51410YDBVR?
All LMR51410YDBVR units undergo pre-shipment inspection (PSI). If there is an issue with LMR51410YDBVR, 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 LMR51410YDBVR part is unused and in its original packaging.
Return procedure for LMR51410YDBVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMR51410YDBVR 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…
