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Texas Instruments LMR51606XFDBVR
- Part No.:
- LMR51606XFDBVR
- Manufacturer:
- Texas Instruments
- Package:
- SOT-23-6
- Datasheet:
-
LMR51606XFDBVR.pdf
- Description:
- IC REG BUCK ADJ 600MA SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,964
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Product details
Overview
LMR51606XFDBVR from Texas Instruments is a 4-V to 65-V input, 0.6-A synchronous buck DC/DC converter in SOT-23-6 package, featuring 400-kHz fixed-frequency FPWM operation, ±1.5% reference voltage accuracy, and integrated high-side/low-side MOSFETs. It delivers regulated output voltage for industrial power conditioning in PLCs, smart meters, and major appliances.
For engineers reviewing the LMR51606XFDBVR datasheet, LMR51606XFDBVR pinout, LMR51606XFDBVR application, or LMR51606XFDBVR equivalent, key selection criteria include its 80-ns minimum on-time, hiccup-mode short-circuit protection, precision enable with 1.227-V turn-on threshold, and support for adjustable output voltage down to 0.8 V via external resistor divider.
Technical Context
The LMR51606XFDBVR employs fixed-frequency peak-current mode control with internal compensation, enabling stable regulation across wide input (4–65 V) and output (0.8–28 V) ranges without external loop components. Its FPWM mode ensures constant 400-kHz switching frequency and low output ripple under all load conditions.
It integrates bootstrap gate drive for the high-side NMOS, uses valley current sensing for short-circuit protection, and implements frequency foldback below 200 kHz when minimum on/off times are reached-extending effective duty cycle to 98% and supporting ultra-low dropout operation.
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 systems with 70-V transient tolerance. |
| Output Current | 0.6 A continuous - rated for sustained loads up to 0.6 A at full junction temperature (–40°C to +150°C). |
| Switching Frequency | 400 kHz fixed - enables compact magnetics design while maintaining EMI predictability and low output voltage ripple in FPWM mode. |
| Reference Voltage | 0.8 V ±1.5% - sets precise output regulation point; used with external resistor divider to configure output from 0.8 V to 28 V. |
| Min. On-Time | 80 ns - allows high step-down ratios (e.g., 48 V → 3.3 V) without requiring frequency foldback at light loads. |
| Thermal Shutdown | 165°C with 20°C hysteresis - protects against thermal runaway during overload or poor PCB thermal design. |
| Enable Threshold | 1.227 V (typical) rising - provides accurate system-level UVLO when paired with external resistor divider on EN pin. |
Pinout & Package
SOT-23-6 (DBV) package: 2.90 mm × 2.80 mm footprint with 0.95-mm height; thermally enhanced for 0.6-A operation in space-constrained industrial PCBs.
| 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 | Internal source node of low-side FET; must be tied directly to system ground and CIN/COUT ground planes with minimal trace length. |
| FB | Feedback input | Analog input referenced to 0.8-V internal bandgap; connects to resistor divider to set output voltage; leakage < 0.2 nA. |
| EN | Precision enable | Active-high digital input; 1.227-V typical turn-on threshold; supports system UVLO or logic-controlled sequencing. |
| VIN | Input supply | Primary power input for internal bias LDO and high-side FET; requires local 10-µF ceramic bypass capacitor. |
| SW | Switching node | Drain of high-side FET / source of low-side FET; connects directly to power inductor; carries high di/dt switching current. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated synchronous rectification | Eliminates external Schottky diode; reduces conduction losses and improves efficiency at medium-to-heavy loads. |
| Internal compensation | Enables stable loop response with only FB divider and output capacitor-no external compensation network required. |
| Hiccup-mode short-circuit protection | Shuts down SW node upon sustained overcurrent, then auto-retries after thermal recovery-prevents device damage during fault. |
| Monotonic start-up with pre-biased output | Ensures controlled voltage ramp even when output capacitor is pre-charged-critical for hot-swap and multi-rail sequencing. |
| 80-ns minimum on-time | Supports high VIN/VOUT ratios (e.g., 48 V → 3.3 V) without skipping cycles or entering discontinuous conduction mode. |
Applications
| PLC Power Supply | Smart Meter Auxiliary Rail |
|---|---|
Use Scenario: Provides isolated 5-V or 3.3-V auxiliary power from 24-V or 48-V field bus in programmable logic controller backplanes. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator delivering clean, regulated DC for microcontroller, I/O drivers, and communication ICs. Use Value: 400-kHz FPWM operation minimizes output ripple (< 10 mVpp), ensuring reliable ADC sampling and CAN transceiver timing. |
Use Scenario: Generates 3.3-V rail for metrology SoC and RF modules in battery-backed smart electricity meters operating from 12-V or 24-V utility input. IC Role / Device Role / Timing Role: High-efficiency, low-quiescent-current (420 µA) buck converter enabling >10-year battery life in standby mode. Use Value: Precision enable with 1.227-V threshold allows seamless integration with battery voltage monitoring circuitry for graceful brownout shutdown. |
| Industrial Appliance Control Board | DCS Field Instrumentation |
Use Scenario: Powers MCU, display driver, and sensor interface on washing machine or HVAC control boards fed from 36-V or 48-V DC bus. IC Role / Device Role / Timing Role: Main system power regulator with robust input transient handling (70-V surge tolerance) and thermal resilience. Use Value: –40°C to +150°C junction rating ensures reliable operation inside sealed, heat-trapped appliance enclosures. |
Use Scenario: Supplies 5-V or 12-V rail for analog front-end and HART modem in distributed control system field transmitters powered from 24-V loop supply. IC Role / Device Role / Timing Role: Compact, rugged buck converter meeting stringent EMC and reliability requirements for hazardous-area installations. Use Value: SOT-23-6 package enables placement near sensors; 98% max duty cycle supports operation down to 4.5-V input during loop voltage sag. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR51606XDBVR | Same 0.6-A rating and 400-kHz frequency, but PFM mode instead of FPWM - lower light-load quiescent current (40 µA vs. 420 µA). | Better suited for battery-powered or always-on low-power systems where efficiency at µA loads matters more than ripple. | Select LMR51606XDBVR if light-load efficiency dominates; choose LMR51606XFDBVR when constant frequency and low output ripple are mandatory. |
| TPS560430DDCR | 0.6-A, 400-kHz buck with similar SOT-23-6 package, but lacks hiccup-mode protection and has wider reference tolerance (±2%). | Targeted at cost-sensitive consumer applications; not qualified for extended industrial temperature range (–40°C to +125°C only). | LMR51606XFDBVR offers superior thermal robustness (150°C TJ), functional safety documentation, and stronger fault protection for industrial use. |
Compared with LMR51606XDBVR, the LMR51606XFDBVR trades light-load efficiency for tighter output regulation and predictable EMI; versus TPS560430DDCR, it delivers higher reliability, broader temperature support, and certified fault-handling features essential for industrial deployment.
Availability
LMR51606XFDBVR is available at Aetrix Electronics and suitable for PLC power supplies, smart meter auxiliary rails, and industrial appliance control boards requiring stable component supply, long-term lifecycle assurance, and automotive-grade traceability.
Supply support for LMR51606XFDBVR 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 experience in industrial-grade power conversion solutions.
The LMR516xx family was designed specifically for rugged industrial DC/DC conversion-emphasizing wide input range, high temperature operation, integrated protection, and ease of layout in space-constrained environments.
FAQ
What is the maximum output voltage supported by the LMR51606XFDBVR?
The LMR51606XFDBVR supports an adjustable output voltage range from 0.8 V to 28 V, set using an external resistor divider connected to the FB pin. The upper limit is constrained by the absolute maximum ratings of the FB pin (–0.3 V to 5.5 V) and practical stability considerations; TI recommends keeping RFBT between 10 kΩ and 100 kΩ for optimal noise immunity and regulation accuracy.
Does the LMR51606XFDBVR require external compensation components?
No, the LMR51606XFDBVR features fully internal compensation, eliminating the need for external Type-II or Type-III compensation networks. This simplifies design, reduces BOM count, and ensures stable operation across a wide range of output capacitors-including ceramic, polymer, and electrolytic types-without tuning.
How does the hiccup-mode short-circuit protection work in the LMR51606XFDBVR?
When the LMR51606XFDBVR detects a sustained short circuit, it enters hiccup mode: the SW pin is disabled, internal circuitry cools, and after a recovery interval (~10 ms), the device attempts soft-start again. This cycle repeats until the fault clears, preventing thermal damage while maintaining system awareness-unlike latch-off protection that requires manual reset.
Can the LMR51606XFDBVR operate with a pre-biased output capacitor?
Yes, the LMR51606XFDBVR supports monotonic start-up into a pre-biased output. Its internal control architecture prevents reverse current flow during startup, avoiding output voltage overshoot or instability-even when the output capacitor is charged to a voltage near or above the target regulation level before enable.
What is the purpose of the CB pin on the LMR51606XFDBVR?
The CB pin is the bootstrap capacitor connection for the high-side MOSFET gate driver. A 100-nF X7R/X5R ceramic capacitor must be placed between CB and SW to generate the ~5-V gate drive voltage needed to fully enhance the integrated high-side switch during each switching cycle-ensuring low RDSON and high efficiency.
LMR51606XFDBVR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- 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:
- 600mA
- 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
LMR51606XFDBVR FAQ
1.How can I place an order for LMR51606XFDBVR through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR51606XFDBVR 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 LMR51606XFDBVR reliable?
The price and inventory of LMR51606XFDBVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR51606XFDBVR is usually 5 days.
3.What payment methods are accepted for LMR51606XFDBVR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR51606XFDBVR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR51606XFDBVR?
LMR51606XFDBVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR51606XFDBVR 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 LMR51606XFDBVR?
For technical support, including LMR51606XFDBVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR51606XFDBVR requirements.
6.How does Aetrix verify that LMR51606XFDBVR is sourced from the original manufacturer or authorized distributors?
All LMR51606XFDBVR 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 LMR51606XFDBVR meets industry standards.
7.What is the process for return or replacement of LMR51606XFDBVR?
All LMR51606XFDBVR units undergo pre-shipment inspection (PSI). If there is an issue with LMR51606XFDBVR, 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 LMR51606XFDBVR part is unused and in its original packaging.
Return procedure for LMR51606XFDBVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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