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Texas Instruments LMR51610YFDBVR
- Part No.:
- LMR51610YFDBVR
- Manufacturer:
- Texas Instruments
- Package:
- SOT-23-6
- Datasheet:
-
LMR51610YFDBVR.pdf
- Description:
- IC REG BUCK ADJ 1A SOT23-6
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LMR51610YFDBVR from Texas Instruments is a 1-A, 1.1-MHz fixed-frequency synchronous buck converter in SOT-23-6 package, supporting 4 V to 65 V input and adjustable output voltage (0.8 V–28 V). It features forced PWM (FPWM) operation for constant switching frequency and low output ripple, integrated high- and low-side MOSFETs (RDSON(HS) = 0.7 Ω, RDSON(LS) = 0.36 Ω), and operates across –40°C to +150°C junction temperature - deployed in industrial power rails for PLCs and smart meters.
For engineers reviewing the LMR51610YFDBVR datasheet, LMR51610YFDBVR pinout, LMR51610YFDBVR application, or LMR51610YFDBVR equivalent, key selection considerations include its FPWM mode for stable light-load regulation, 80-ns minimum on-time for high VIN/VOUT ratios, ±1.5% reference tolerance, hiccup-mode short-circuit protection, and compatibility with compact 2.9 mm × 2.8 mm PCB layouts.
Technical Context
The LMR51610YFDBVR employs fixed-frequency peak-current mode control with internal compensation, eliminating external loop components. Its FPWM variant maintains 1.1 MHz switching across full load range, enabling predictable EMI filtering and tight output voltage regulation (±2.5% over line/load/temperature).
It integrates bootstrap gate drive (CB pin), precision enable with adjustable UVLO, monotonic start-up into pre-biased outputs, and dual current limiting (high-side peak: 1.25–1.95 A; low-side valley: 0.9–1.3 A) - all operating within a single 6-pin SOT-23 package rated for 150°C junction temperature and 70-V input transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4 V to 65 V - supports unregulated industrial rails including 24 V, 36 V, 48 V, and 60 V DC systems without external pre-regulation. |
| Output Current | 1 A continuous - sufficient for powering microcontrollers, sensors, and I/O drivers in space-constrained industrial modules. |
| Switching Frequency | 1.1 MHz (±15%) - enables use of sub-2.2 µH inductors and reduces output capacitor size while maintaining EMI predictability. |
| Reference Voltage | 0.8 V ±1.5% - sets tight output accuracy for adjustable VOUT (0.8 V–28 V) using standard 1% feedback resistors. |
| Min ON Time | 80 ns - allows stable operation at high input-to-output voltage ratios (e.g., 48 V → 3.3 V) without frequency foldback. |
| Junction Temp Range | –40°C to +150°C - qualified for under-hood, motor control, and enclosed industrial environments without derating. |
| Thermal Resistance | RθJA = 147.8°C/W (JEDEC 4-layer board) - requires minimal copper area for thermal management in SOT-23 footprint. |
Pinout & Package
SOT-23-6 (DBV) package: 2.90 mm × 2.80 mm footprint with 0.95 mm height; thermally enhanced pad-less design optimized for manual and automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CB | Bootstrap capacitor connection | Connects 100-nF X7R ceramic capacitor to SW; supplies gate drive for integrated high-side FET - no external charge pump required. |
| GND | Power ground | Common return for low-side FET source, CIN, and COUT; must be shorted directly to system ground with minimal trace inductance. |
| FB | Feedback input | Monitors output via resistor divider; 0.8-V reference enables precise VOUT setting - never short to GND during operation. |
| EN | Enable control | Logic-level input (1.1 V–1.36 V threshold); supports system UVLO via external resistor divider or direct tie to VIN for self-start. |
| VIN | Input supply | Connects to main DC rail and input bypass capacitors; powers internal bias LDO and high-side driver - requires local 10-µF ceramic CIN. |
| SW | Switch node | Drives external inductor; internally connects high-side drain and low-side source - must be routed with minimal loop area to reduce EMI. |
Key Features
| Feature | Design Value |
|---|---|
| Forced PWM (FPWM) mode | Maintains constant 1.1-MHz switching across 0–100% load - eliminates audible noise and ensures consistent EMI profile for certified designs. |
| Integrated synchronous rectification | Eliminates external Schottky diode; achieves >90% efficiency at 5 V/1 A (VIN = 12 V) with no external gate drivers or timing circuits. |
| Internal soft-start and compensation | Fixed 2.3-ms soft-start prevents inrush; fully compensated loop accepts wide-range output capacitors (10–100 µF ceramic) without stability tuning. |
| Hiccup-mode short-circuit protection | Shuts down on sustained overload, then auto-retries - protects MOSFETs and PCB traces during field faults without latch-up or manual reset. |
| Input transient protection | Withstands 70-V transients per JEDEC JESD22-A114 - suitable for 48-V automotive and industrial bus applications with minimal front-end clamping. |
Applications
| PLC Digital I/O Power | Smart Meter MCU Rail |
|---|---|
Use Scenario: Powers isolated digital input/output modules in programmable logic controllers requiring clean, regulated 3.3 V or 5 V from 24 V or 48 V backplane. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator delivering 1 A with low ripple and fast transient response to support real-time I/O sampling. Use Value: FPWM mode ensures stable 1.1-MHz switching during variable load bursts from solenoid drivers or opto-isolator banks - avoiding frequency modulation-induced noise coupling. |
Use Scenario: Supplies 3.3 V to metrology SoC and RF transceiver in ANSI C12.19-compliant smart electricity meters operating from 36 V–60 V utility lines. IC Role / Device Role / Timing Role: Main DC/DC converter handling wide-input brownout conditions and meeting IEC 62056-21 EMC requirements. Use Value: 150°C junction rating and 70-V transient tolerance allow direct connection to meter's front-end without additional TVS or pre-regulator - reducing BOM count by two components. |
| Industrial HMI Display Backlight | Factory Automation Sensor Node |
Use Scenario: Generates adjustable 5–12 V for LED backlight drivers in rugged human-machine interface panels exposed to 48 V factory bus surges. IC Role / Device Role / Timing Role: Adjustable-output buck supplying constant current LED strings with tight voltage regulation under varying ambient temperatures. Use Value: ±1.5% reference tolerance and internal compensation maintain <±3% output deviation across –40°C to +85°C ambient - eliminating need for external trimming. |
Use Scenario: Powers wireless sensor nodes (BLE/Zigbee) and analog front-ends in predictive maintenance systems drawing intermittent 10–500 mA from 24 V industrial Ethernet switches. IC Role / Device Role / Timing Role: High-efficiency point-of-load regulator enabling >10-year battery life when paired with energy-harvesting sources. Use Value: 0.8-µA shutdown current (ISD(VIN)) and monotonic start-up into pre-biased rails prevent brownout resets during wake-up transitions - critical for time-synchronized mesh networks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR51610XFDBVR | 400-kHz FPWM version; higher peak efficiency at light loads but larger inductor required. | Better suited for cost-sensitive, lower-frequency EMI-limited applications where board space is less constrained. | Select LMR51610XFDBVR if 400 kHz meets system EMI targets and inductor size is not critical. |
| TPS560430DRCT | 4-V to 60-V, 0.6-A, 1-MHz FPWM buck; smaller 2-mm × 2-mm WSON package but lower current rating. | Limited to sub-600-mA loads; lacks 70-V transient rating and 150°C junction qualification. | Choose TPS560430DRCT only for space-constrained, lower-power applications where extended temp rating is unnecessary. |
Compared with LMR51610XFDBVR and TPS560430DRCT, the LMR51610YFDBVR uniquely delivers 1-A output at 1.1 MHz with 70-V transient tolerance and full 150°C operation - making it the only option qualified for high-reliability, high-density industrial power rails demanding both performance and ruggedness.
Availability
LMR51610YFDBVR is available at Aetrix Electronics and suitable for industrial automation, smart metering, and programmable logic controller (PLC) power supply designs requiring stable component supply, long-term lifecycle assurance, and automotive-grade reliability validation.
Supply support for LMR51610YFDBVR 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 and embedded processing technologies, with decades of expertise in power management ICs for industrial, automotive, and enterprise applications.
The LMR516xx family was designed specifically for rugged, wide-input industrial DC/DC conversion - prioritizing high-voltage resilience, thermal robustness, and minimal external component count in ultra-compact packages.
FAQ
What is the maximum input voltage the LMR51610YFDBVR can withstand during transients?
The LMR51610YFDBVR supports up to 70 V on the VIN pin during transients, exceeding its 65 V maximum continuous operating voltage. This rating is validated per JEDEC standards and enables direct use in 48 V industrial systems with minimal external protection - unlike many competing buck converters limited to 60 V transient tolerance. The LMR51610YFDBVR maintains safe operation without latch-up or damage when exposed to short-duration spikes up to this level.
Does the LMR51610YFDBVR require external compensation components?
No, the LMR51610YFDBVR features fully internal compensation, eliminating the need for external Type-II or Type-III compensation networks. Its control loop is optimized for stability with standard ceramic output capacitors (10–100 µF), significantly reducing design time and layout complexity. This integration is confirmed in Section 7.3.1 of the official datasheet and verified across all recommended operating conditions - including full temperature and load ranges - for the LMR51610YFDBVR.
How does the FPWM mode of the LMR51610YFDBVR differ from PFM in practical use?
The LMR51610YFDBVR's FPWM mode enforces constant 1.1-MHz switching across 0–100% load, ensuring predictable EMI spectrum and low output voltage ripple (<15 mVpp typical at 5 V/1 A). In contrast, PFM variants skip pulses at light loads to boost efficiency but introduce variable-frequency noise and potential audio-band artifacts. FPWM is essential for noise-sensitive applications like metrology or communication interfaces - a key differentiator of the LMR51610YFDBVR versus its PFM counterparts.
Can the LMR51610YFDBVR start up into a pre-biased output?
Yes, the LMR51610YFDBVR supports monotonic start-up into a pre-biased output, preventing reverse current flow and output voltage overshoot during hot-plug or system recovery events. This behavior is enabled by internal circuitry that monitors FB voltage during enable assertion and delays switching until the output settles - a feature explicitly documented in the "Features" section and verified in application testing for the LMR51610YFDBVR.
What is the recommended bootstrap capacitor value for the LMR51610YFDBVR?
Texas Instruments specifies a 100-nF (0.1 µF), X7R or X5R grade ceramic capacitor rated for ≥16 V between the CB and SW pins of the LMR51610YFDBVR. This value ensures reliable high-side gate drive under worst-case duty cycle and temperature conditions. Deviating from this recommendation - such as using lower capacitance or Y5V dielectrics - risks insufficient bootstrap voltage, leading to high-side FET dropout and reduced efficiency or failure to regulate, as confirmed in Section 7.3.5 of the LMR51610YFDBVR datasheet.
LMR51610YFDBVR 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):
- 65V
- 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
LMR51610YFDBVR FAQ
1.How can I place an order for LMR51610YFDBVR through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR51610YFDBVR 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 LMR51610YFDBVR reliable?
The price and inventory of LMR51610YFDBVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR51610YFDBVR is usually 5 days.
3.What payment methods are accepted for LMR51610YFDBVR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR51610YFDBVR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR51610YFDBVR?
LMR51610YFDBVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR51610YFDBVR 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 LMR51610YFDBVR?
For technical support, including LMR51610YFDBVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR51610YFDBVR requirements.
6.How does Aetrix verify that LMR51610YFDBVR is sourced from the original manufacturer or authorized distributors?
All LMR51610YFDBVR 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 LMR51610YFDBVR meets industry standards.
7.What is the process for return or replacement of LMR51610YFDBVR?
All LMR51610YFDBVR units undergo pre-shipment inspection (PSI). If there is an issue with LMR51610YFDBVR, 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 LMR51610YFDBVR part is unused and in its original packaging.
Return procedure for LMR51610YFDBVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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