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Texas Instruments LMR51606XDBVR
- Part No.:
- LMR51606XDBVR
- Manufacturer:
- Texas Instruments
- Package:
- SOT-23-6
- Datasheet:
-
LMR51606XDBVR.pdf
- Description:
- IC REG BUCK ADJ 600MA SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,329
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Product details
Overview
LMR51606XDBVR from Texas Instruments is a synchronous buck DC/DC converter delivering up to 0.6-A continuous output current, operating from 4-V to 65-V input with 400-kHz fixed switching frequency and PFM light-load mode. 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 LMR51606XDBVR datasheet, LMR51606XDBVR pinout, LMR51606XDBVR application, or LMR51606XDBVR equivalent, key selection criteria include its 0.6-A rated output, 400-kHz PFM operation, SOT-23-6 package, ±1.5% reference tolerance, and 80-ns minimum on-time - all critical for rugged 4–65-V industrial supply designs.
Technical Context
The LMR51606XDBVR employs fixed-frequency peak-current mode control with internal voltage loop compensation, enabling stable regulation using minimal external components. Its PFM mode reduces quiescent current to 26.5–40 µA at light load while maintaining 400-kHz operation under full load.
It features cycle-by-cycle current limiting (0.8–1.4 A high-side peak), hiccup-mode short-circuit protection, thermal shutdown at 165°C, and precision enable with 1.1–1.36 V rising threshold. The integrated bootstrap circuit supports high-side gate drive via a 100-nF CB capacitor connected between CB and SW pins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4 V to 65 V - supports direct connection to unregulated industrial rails including 24-V, 36-V, 48-V, and 60-V systems. |
| Output Current | 0.6 A continuous - sufficient for powering microcontrollers, sensors, and I/O interfaces in PLC modules and smart meter subsystems. |
| Switching Frequency | 400 kHz (PFM) - balances efficiency and EMI performance; enables use of compact 2.2-µH inductors and low-ESR ceramic output capacitors. |
| Reference Voltage | 0.8 V ±1.5% - sets tight output regulation accuracy across –40°C to +150°C junction temperature range. |
| Min. On-Time | 80 ns - enables high step-down ratios (e.g., 48 V → 3.3 V) without requiring frequency foldback at nominal VIN. |
| Junction Temp Range | –40°C to +150°C - qualified for harsh environments such as factory automation enclosures and outdoor utility metering. |
| Quiescent Current | 26.5–40 µA (PFM mode) - extends battery backup runtime in always-on smart meter applications. |
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 confined industrial PCB layouts.
| 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 internal low-side FET source, CIN, and COUT; requires shortest possible trace to minimize noise and improve thermal dissipation. |
| FB | Feedback input | Monitors output voltage via resistor divider; 0.8-V reference enables adjustable VOUT from 0.8 V to 28 V with ±1.5% accuracy. |
| EN | Precision enable | Logic-controlled startup with 1.1–1.36 V rising threshold; supports system-level UVLO via external resistor divider. |
| VIN | Input supply | Connects to 4–65-V source and input bypass capacitors; powers internal bias LDO and high-side driver circuitry. |
| SW | Switch node | Drives external inductor; internally connects high-side drain and low-side source; requires tight layout to minimize EMI and ringing. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated synchronous rectification | Eliminates need for external Schottky diode; improves full-load efficiency by ~5–8% vs. asynchronous designs. |
| Internal compensation | Reduces BOM count by removing external Type-II/III compensation network; simplifies design validation for 3.3-V/5-V/12-V outputs. |
| Monotonic start-up with pre-biased output | Prevents reverse current flow into powered-up downstream circuits during hot-plug or brownout recovery. |
| Hiccup-mode short-circuit protection | Shuts down SW node after fault detection, then retries after cooldown - prevents thermal runaway during sustained overload. |
| Input transient protection to 70 V | Withstands 70-V transients per Absolute Maximum Ratings - protects against load-dump events in 24-V industrial systems. |
Applications
| PLC Digital I/O Module | Smart Electricity Meter |
|---|---|
Use Scenario: Powering isolated digital input/output channels in modular programmable logic controllers with 24-V field bus supply. IC Role / Device Role / Timing Role: Primary 5-V or 3.3-V point-of-load regulator converting 24-V rail to MCU, isolator, and sensor interface voltages. Use Value: 0.6-A output sustains simultaneous activation of multiple optocouplers and level shifters; 400-kHz PFM maintains >85% efficiency at 10-mA standby load. | Use Scenario: Supplying metrology ASIC, RTC, and communication interface (NB-IoT/PLC) in revenue-grade electricity meters with battery backup. IC Role / Device Role / Timing Role: Main system regulator delivering stable 3.3-V rail from either mains-derived DC or Li-SOCl₂ battery during grid outage. Use Value: 26.5–40 µA quiescent current extends 10-year battery life; –40°C to +150°C rating ensures reliability inside sealed outdoor meter enclosures. |
| Industrial HMI Display Backlight | DC Motor Control Auxiliary Supply |
Use Scenario: Generating regulated 5-V supply for LED driver ICs and touch controller in human-machine interface panels exposed to factory ambient temperatures. IC Role / Device Role / Timing Role: Secondary buck converter stepping down 24-V panel bus to clean 5-V for display electronics. Use Value: 98% max duty cycle enables operation down to 5.1-V input during brownouts; thermal shutdown at 165°C prevents failure during prolonged sunlight exposure. | Use Scenario: Providing isolated 12-V auxiliary power for gate drivers and current-sense amplifiers in 24-V brushed DC motor control modules. IC Role / Device Role / Timing Role: Compact, rugged DC/DC stage decoupling motor commutation noise from sensitive analog and logic circuitry. Use Value: Input transient rating to 70 V tolerates inductive kickback from motor leads; SOT-23-6 footprint fits tight space constraints near motor connectors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR51606YDBVR | 1.1-MHz PFM switching frequency vs. 400-kHz - enables smaller inductors but increases switching losses at full load. | Better suited for space-constrained designs where 12-V→3.3-V conversion dominates; less optimal for high-efficiency 24-V→5-V at >300 mA. | Select Y-version when board area is critical and light-load efficiency is secondary to size reduction. |
| LMR50410XDDAR | 4-V to 36-V input range, 1-A output, SO-8 package - lacks 65-V rating and 70-V transient tolerance. | Applicable only in lower-voltage industrial systems (e.g., 12-V automotive test equipment); not suitable for 48-V factory automation or solar-powered meters. | Choose LMR50410XDDAR only if input never exceeds 36 V and higher output current is required in non-transient-heavy environments. |
Compared with LMR51606YDBVR and LMR50410XDDAR, the LMR51606XDBVR uniquely balances 65-V input capability, 0.6-A output, 400-kHz PFM efficiency, and SOT-23-6 compactness - making it optimal for cost-sensitive, thermally constrained 24–48-V industrial subsystems requiring long-term reliability.
Availability
LMR51606XDBVR is available at Aetrix Electronics and suitable for PLC digital I/O modules, smart electricity meters, industrial HMI displays, and DC motor control auxiliary supplies requiring stable component supply across multi-year production cycles.
Supply support for LMR51606XDBVR 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 over 90 years of innovation in industrial and automotive electronics.
The LMR516xx product line was designed specifically for rugged, wide-input industrial DC/DC conversion - targeting applications where reliability across –40°C to +150°C, transient immunity, and minimal external component count are mandatory.
FAQ
What is the maximum input voltage the LMR51606XDBVR can withstand without damage?
The LMR51606XDBVR has an absolute maximum input voltage rating of 70 V, meaning it can survive short-duration transients up to that level. Its recommended operating input range is 4 V to 65 V. This 70-V transient rating makes LMR51606XDBVR suitable for industrial 24-V and 48-V systems subject to load dump or inductive switching spikes. Always ensure input filtering limits dwell time above 65 V to avoid derating lifetime.
Does the LMR51606XDBVR require external compensation components?
No, the LMR51606XDBVR features fully internal compensation, eliminating the need for external Type-II or Type-III compensation networks. This simplifies design, reduces BOM count, and improves stability across varied output capacitor types (including ceramic, polymer, and electrolytic). The internal loop is optimized for standard 3.3-V, 5-V, and 12-V configurations using typical inductor and capacitor values specified in the datasheet.
How does the LMR51606XDBVR handle short-circuit conditions?
The LMR51606XDBVR uses hiccup-mode short-circuit protection: upon detecting sustained overcurrent, it shuts down the SW node, waits for thermal recovery, then attempts restart. This prevents thermal runaway and device destruction during output faults. Cycle-by-cycle current limiting (0.8–1.4 A high-side peak) provides immediate response to transient overloads. Both mechanisms are fully integrated - no external fault-handling circuitry is needed for LMR51606XDBVR deployment.
Can the LMR51606XDBVR be used with a pre-biased output?
Yes, the LMR51606XDBVR supports monotonic start-up into a pre-biased output, preventing reverse current flow into already-powered downstream circuitry. This feature is essential in hot-swap, redundant power, or battery-backed systems where the output may retain voltage during input reapplication. No external diodes or sequencing controllers are required - the behavior is inherent to the LMR51606XDBVR's control architecture.
What is the purpose of the CB pin on the LMR51606XDBVR?
The CB (bootstrap capacitor) pin on the LMR51606XDBVR connects to a 100-nF ceramic capacitor tied to the SW node, forming a charge pump that generates the gate drive voltage for the integrated high-side MOSFET. This self-contained bootstrap circuit eliminates the need for an external high-voltage bias supply. Proper placement and selection of the CB capacitor (X7R/X5R, ≥16-V rating) are critical to maintain reliable high-side switching across temperature and load.
LMR51606XDBVR 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
LMR51606XDBVR FAQ
1.How can I place an order for LMR51606XDBVR through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR51606XDBVR 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 LMR51606XDBVR reliable?
The price and inventory of LMR51606XDBVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR51606XDBVR is usually 5 days.
3.What payment methods are accepted for LMR51606XDBVR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR51606XDBVR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR51606XDBVR?
LMR51606XDBVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR51606XDBVR 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 LMR51606XDBVR?
For technical support, including LMR51606XDBVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR51606XDBVR requirements.
6.How does Aetrix verify that LMR51606XDBVR is sourced from the original manufacturer or authorized distributors?
All LMR51606XDBVR 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 LMR51606XDBVR meets industry standards.
7.What is the process for return or replacement of LMR51606XDBVR?
All LMR51606XDBVR units undergo pre-shipment inspection (PSI). If there is an issue with LMR51606XDBVR, 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 LMR51606XDBVR part is unused and in its original packaging.
Return procedure for LMR51606XDBVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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