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Texas Instruments LMR51610XFDBVR
- Part No.:
- LMR51610XFDBVR
- Manufacturer:
- Texas Instruments
- Package:
- SOT-23-6
- Datasheet:
-
LMR51610XFDBVR.pdf
- Description:
- IC REG BUCK ADJ 1A SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:922
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Product details
Overview
LMR51610XFDBVR from Texas Instruments is a synchronous buck DC/DC converter delivering 1-A continuous output current, operating from 4-V to 65-V input with 400-kHz fixed-frequency forced-PWM (FPWM) control and adjustable output voltage. It integrates high- and low-side MOSFETs, internal compensation, and precision enable for industrial power conditioning in PLCs and smart meters.
For engineers reviewing the LMR51610XFDBVR datasheet, LMR51610XFDBVR pinout, LMR51610XFDBVR application, or LMR51610XFDBVR equivalent, key selection considerations include its FPWM operation mode for constant-frequency regulation, 80-ns minimum on-time, ±1.5% reference tolerance, hiccup-mode short-circuit protection, and SOT-23-6 thermal performance at up to 150°C junction temperature.
Technical Context
The LMR51610XFDBVR employs fixed-frequency peak-current mode control with internal slope compensation and integrated high-/low-side NMOS switches. Its FPWM mode maintains constant 400-kHz switching across full load range, eliminating frequency variation and minimizing output voltage ripple.
It features monotonic start-up with pre-biased output support, precision enable with 1.227-V typical turn-on threshold, and cycle-by-cycle current limiting with hiccup-mode recovery during sustained overloads. The device uses internal soft-start (2.3-ms fixed duration) and supports adjustable output via 0.8-V reference with external resistor divider.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4 V to 65 V - supports wide industrial supply rails including 24-V, 36-V, and 48-V systems without external pre-regulation. |
| Output Current | 1 A continuous - sufficient for powering microcontrollers, sensors, and communication ICs in embedded industrial nodes. |
| Switching Frequency | 400 kHz (FPWM) - enables use of compact 2.2-µH to 4.7-µH inductors while maintaining low output ripple and predictable EMI profile. |
| Reference Voltage | 0.8 V ±1.5% - ensures tight output regulation accuracy across –40°C to +150°C junction temperature range. |
| Min. On-Time | 80 ns - allows high step-down ratios (e.g., 48 V → 3.3 V) without requiring frequency foldback at light loads. |
| Junction Temp. Range | –40°C to +150°C - rated for harsh environments including motor drives, factory automation, and outdoor metering enclosures. |
| Quiescent Current | 420 µA (FPWM active) - balances low-noise regulation with moderate standby power in always-on applications. |
Pinout & Package
SOT-23-6 (DBV) package: 2.90 mm × 2.80 mm footprint with exposed pad for thermal enhancement; suitable for high-density PCB layouts and automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CB | Bootstrap capacitor connection | Connects 100-nF ceramic capacitor to SW; supplies gate drive voltage for integrated high-side MOSFET. |
| GND | Power ground | Common return for low-side FET source, CIN, COUT, and PCB thermal pad; requires shortest possible path to input capacitor. |
| FB | Feedback input | Monitors output via resistor divider; 0.8-V reference sets VOUT = 0.8 × (1 + RFBT/RFBB); must not be shorted to GND. |
| EN | Precision enable | Active-high logic input (1.227-V typical threshold); supports system UVLO via external resistor divider or direct VIN tie. |
| VIN | Input supply | Connects to main input rail and bypass capacitors; powers internal LDO and high-side driver; withstands 70-V transients. |
| SW | Switch node | Drives external inductor; internally connects high-side drain and low-side source; requires low-inductance layout to minimize ringing. |
Key Features
| Feature | Design Value |
|---|---|
| Forced PWM (FPWM) mode | Maintains constant 400-kHz switching under all load conditions - eliminates audible noise and simplifies EMI filtering. |
| Integrated synchronous rectification | Eliminates external Schottky diode - reduces BOM count, improves efficiency by ~5% at mid-load vs. asynchronous designs. |
| Internal compensation | Enables stable operation with standard ceramic output capacitors - no external Type-II/III compensation network required. |
| Hiccup-mode short-circuit protection | Shuts down and auto-retries after fault - prevents thermal runaway during sustained output shorts without manual reset. |
| Monotonic start-up with pre-bias support | Prevents output voltage undershoot or reverse current when powered into an already-biased rail - critical for hot-swap and multi-rail systems. |
Applications
| PLC Power Supply | Smart Meter Auxiliary Rail |
|---|---|
|
Use Scenario: Powers I/O modules and isolated communication interfaces (RS-485, CAN) in programmable logic controllers operating from 24-V or 48-V field buses. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator delivering regulated 3.3-V or 5-V rail to microcontroller and peripheral ICs. Use Value: Withstands 70-V input transients common in industrial wiring environments and maintains regulation down to 4-V during brownout events. |
Use Scenario: Generates stable 3.3-V supply for metrology ADC, real-time clock, and RF transceiver in battery-backed smart electricity meters. IC Role / Device Role / Timing Role: High-efficiency FPWM buck converter ensuring consistent timing and low-noise analog performance across battery and line-powered modes. Use Value: 420-µA quiescent current minimizes battery drain during long-term backup operation while 150°C rating supports sealed meter enclosures. |
| DCS Field Instrumentation | Industrial HMI Display Backlight |
|
Use Scenario: Supplies 5-V or 12-V rail to sensor signal conditioning circuits and HART modem in distributed control system field transmitters. IC Role / Device Role / Timing Role: Compact, rugged DC/DC stage converting unregulated 12–36-V loop power to clean analog and digital subsystem rails. Use Value: SOT-23-6 footprint fits space-constrained transmitter housings; 80-ns min on-time supports 36-V → 5-V conversion without frequency foldback. |
Use Scenario: Drives LED backlight for 4.3″–7″ industrial human-machine interface displays powered from 24-V chassis supply. IC Role / Device Role / Timing Role: Adjustable-output buck converter configured for constant-voltage LED bias (e.g., 12-V @ 1 A). Use Value: 1-A output capability and 98% max duty cycle enable direct 24-V → 12-V conversion with minimal dropout; FPWM ensures flicker-free dimming control. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR51610XDBVR | Same 1-A, 400-kHz PFM variant - lacks forced PWM; enters pulse-frequency modulation below ~100-mA load. | Better light-load efficiency but higher output ripple and variable frequency; unsuitable where EMI predictability is critical. | Select LMR51610XDBVR only if ultra-low standby power (<40 µA) outweighs ripple and EMI constraints. |
| TPS560430DRCT | 1-A, 400-kHz FPWM buck in 2-mm × 2-mm WSON-6; lower 3-V min input, no 70-V transient rating. | Limited to ≤36-V nominal inputs; lacks industrial-grade transient robustness and extended temperature support. | Choose TPS560430DRCT for cost-sensitive consumer or commercial applications with benign input conditions. |
Compared with LMR51610XDBVR and TPS560430DRCT, the LMR51610XFDBVR uniquely combines 65-V input capability, 70-V transient tolerance, FPWM operation, and –40°C to +150°C rating - making it the only option qualified for demanding industrial power rails where reliability and regulation stability are non-negotiable.
Availability
LMR51610XFDBVR is available at Aetrix Electronics and suitable for PLC power supplies, smart meter auxiliary rails, and DCS field instrumentation requiring stable component supply across extended temperature and high-transient environments.
Supply support for LMR51610XFDBVR 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 focused on analog, embedded processing, and connectivity technologies, serving industrial, automotive, and communications markets.
The LMR516xx family is designed specifically for rugged industrial DC/DC conversion - emphasizing wide input range, high-temperature operation, transient robustness, and ease-of-use in space-constrained, high-reliability applications.
FAQ
What is the switching frequency mode of the LMR51610XFDBVR?
The LMR51610XFDBVR operates exclusively in forced PWM (FPWM) mode at a nominal 400 kHz. Unlike its PFM counterpart (LMR51610XDBVR), it maintains constant frequency across the entire load range - from zero to 1 A - ensuring predictable EMI behavior and minimal output voltage ripple, especially critical in noise-sensitive analog and communication subsystems.
Does the LMR51610XFDBVR support adjustable output voltage?
Yes, the LMR51610XFDBVR supports fully adjustable output voltage using an external resistor divider connected to the FB pin. Its internal 0.8-V ±1.5% reference enables precise regulation from 0.8 V up to 28 V. TI recommends 1% tolerance resistors with low temperature coefficients, and specifies RFBT between 10 kΩ and 100 kΩ for optimal noise immunity and divider current balance.
What protection features does the LMR51610XFDBVR include?
The LMR51610XFDBVR integrates cycle-by-cycle current limiting, hiccup-mode short-circuit protection, thermal shutdown (165°C trip), and input undervoltage lockout (UVLO with 3.82-V rising threshold). These features ensure safe operation during overload, output short, overtemperature, and brownout conditions - essential for unattended industrial equipment where field reliability is mandatory.
Can the LMR51610XFDBVR start up into a pre-biased output?
Yes, the LMR51610XFDBVR supports monotonic start-up into a pre-biased output rail. Its internal control architecture prevents reverse current flow and output voltage undershoot during power-up, making it suitable for hot-swap applications and multi-rail systems where downstream circuitry may retain residual charge before the converter is enabled.
What is the thermal performance of the LMR51610XFDBVR in SOT-23-6 package?
In the SOT-23-6 (DBV) package, the LMR51610XFDBVR has a junction-to-ambient thermal resistance (RθJA) of 147.8°C/W on a standard 4-layer JEDEC board, and 95°C/W on its evaluation module layout. With proper PCB copper area and thermal vias, it sustains 1-A output continuously at ambient temperatures up to +85°C while staying within its –40°C to +150°C junction limit - validated for industrial enclosure deployments.
LMR51610XFDBVR 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:
- 400kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-6
LMR51610XFDBVR FAQ
1.How can I place an order for LMR51610XFDBVR through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR51610XFDBVR 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 LMR51610XFDBVR reliable?
The price and inventory of LMR51610XFDBVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR51610XFDBVR is usually 5 days.
3.What payment methods are accepted for LMR51610XFDBVR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR51610XFDBVR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR51610XFDBVR?
LMR51610XFDBVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR51610XFDBVR 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 LMR51610XFDBVR?
For technical support, including LMR51610XFDBVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR51610XFDBVR requirements.
6.How does Aetrix verify that LMR51610XFDBVR is sourced from the original manufacturer or authorized distributors?
All LMR51610XFDBVR 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 LMR51610XFDBVR meets industry standards.
7.What is the process for return or replacement of LMR51610XFDBVR?
All LMR51610XFDBVR units undergo pre-shipment inspection (PSI). If there is an issue with LMR51610XFDBVR, 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 LMR51610XFDBVR part is unused and in its original packaging.
Return procedure for LMR51610XFDBVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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