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Texas Instruments LMR51606YDBVR
- Part No.:
- LMR51606YDBVR
- Manufacturer:
- Texas Instruments
- Package:
- SOT-23-6
- Datasheet:
-
LMR51606YDBVR.pdf
- Description:
- IC REG BUCK ADJ 600MA SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,337
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Product details
Overview
LMR51606YDBVR from Texas Instruments is a 0.6-A, 1.1-MHz PFM synchronous buck converter in SOT-23-6 package, designed for industrial power conditioning from unregulated 4–65-V sources. It delivers regulated adjustable output (0.8–28 V), features 80-ns minimum on-time, ±1.5% reference voltage accuracy, and operates across –40°C to +150°C junction temperature for rugged PLC and smart meter applications.
For engineers reviewing the LMR51606YDBVR datasheet, LMR51606YDBVR pinout, LMR51606YDBVR application, or LMR51606YDBVR equivalent, key selection considerations include its 1.1-MHz PFM operation for high light-load efficiency, 70-V input transient tolerance, integrated high/low-side MOSFETs (0.7 Ω / 0.36 Ω), precision enable with UVLO control, and thermal shutdown at 165°C.
Technical Context
The LMR51606YDBVR employs fixed-frequency peak-current mode control with internal compensation, enabling stable regulation using minimal external components. Its PFM mode dynamically disables switching at light load to maximize efficiency, while maintaining monotonic start-up and pre-biased output compatibility.
It integrates bootstrap gate drive for the high-side NMOS, uses valley current limiting for short-circuit protection in hiccup mode, and implements frequency foldback below 200 kHz when minimum on-time (80 ns) or off-time (200 ns) limits are reached-extending effective duty cycle up to 98% and supporting wide VIN-to-VOUT ratios.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4 V to 65 V - supports direct connection to industrial 24-V, 36-V, 48-V, and 60-V rails with 70-V transient tolerance. |
| Output Current | 0.6 A continuous - sufficient for powering microcontrollers, sensors, and isolated interface ICs in space-constrained designs. |
| Switching Frequency | 1.1 MHz (±15%) - enables use of sub-2.2-µH inductors and reduces output ripple without requiring FPWM mode. |
| Reference Voltage | 0.8 V ±1.5% - sets tight output regulation (e.g., 5 V ±3%) over –40°C to +150°C with external resistor divider. |
| Min. On-Time | 80 ns - allows ≥12:1 step-down ratio at 1.1 MHz (e.g., 65 V → 5 V), critical for high-input, low-output applications. |
| Junction Temp. Range | –40°C to +150°C - qualified for under-hood, motor control, and industrial enclosure environments without derating. |
| Quiescent Current | 26.5–40 µA (PFM, non-switching) - extends battery life in always-on monitoring circuits powered from 12–48 V sources. |
Pinout & Package
SOT-23-6 (DBV) package: 2.90 mm × 2.80 mm footprint, thermally enhanced with exposed pad (not electrically connected), compatible with standard SMT reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CB | Bootstrap capacitor connection | Connects 100-nF X7R ceramic cap to SW; supplies gate drive voltage for integrated high-side MOSFET. |
| GND | Power ground | Internal source node of low-side FET; must tie directly to system ground and CIN/COUT ground planes with shortest possible path. |
| FB | Feedback input | Monitors output via resistor divider; 0.2-nA leakage ensures minimal error in high-impedance dividers (e.g., RFBT = 499 kΩ). |
| EN | Precision enable | 1.1–1.36 V rising threshold enables sequencing; supports external UVLO divider (e.g., RENT/RENB) for system-level brownout protection. |
| VIN | Input supply | Connects to 4–65-V source and local 10-µF ceramic bypass cap; powers internal bias LDO and high-side driver. |
| SW | Switching node | Drives external power inductor; internally connects high-side drain and low-side source; requires tight layout to minimize EMI. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated synchronous rectification | Eliminates external Schottky diode; achieves >90% efficiency at 0.3-A load with 24-V input and 5-V output. |
| Internal compensation | Reduces BOM count by removing external Type-II/III compensation network; stable with 10–100-µF ceramic output capacitors. |
| Hiccup-mode short-circuit protection | Shuts down SW node after fault detection, then auto-retries - prevents thermal runaway during sustained output shorts. |
| Monotonic start-up with pre-biased output | Guarantees controlled voltage ramp even when output is pre-charged (e.g., hot-swap or backup rail scenarios). |
| 80-ns minimum on-time | Enables high step-down conversion (e.g., 48 V → 3.3 V) at 1.1 MHz without skipping cycles or entering dropout. |
Applications
| PLC Analog I/O Module | Smart Meter MCU Power Rail |
|---|---|
Use Scenario: Powers 3.3-V microcontroller and 24-bit ADC in DIN-rail mounted programmable logic controller with 24-V DC field supply. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator delivering clean, low-noise 3.3-V rail from noisy 24-V bus. Use Value: 1.1-MHz PFM operation maintains >85% efficiency at 10-mA sleep current while rejecting conducted noise from solenoid drivers. |
Use Scenario: Supplies 5-V rail to metrology SoC and RTC in ANSI C12.22-compliant electricity meter operating from 12–48-V AC/DC adapter. IC Role / Device Role / Timing Role: Main DC/DC converter regulating output from wide-input unregulated supply with precise enable sequencing. Use Value: ±1.5% reference and –40°C to +150°C rating ensure metrology-grade accuracy across environmental stress tests. |
| Industrial HMI Display Backlight | Factory Automation Sensor Node |
Use Scenario: Generates adjustable 12-V output for LED backlight in 7-inch TFT HMI panel powered from 24-V factory bus. IC Role / Device Role / Timing Role: Adjustable-output buck converter with FB divider setting VOUT = 12 V ±2%. Use Value: 98% max duty cycle and frequency foldback sustain regulation during 24-V brownouts down to 13.5 V input. |
Use Scenario: Powers ultra-low-power wireless sensor (sub-GHz RF + Cortex-M0+) from 36-V PoE-derived supply in predictive maintenance node. IC Role / Device Role / Timing Role: Efficient 0.6-A step-down stage converting PoE midspan voltage to 3.3-V logic rail. Use Value: 26.5-µA quiescent current in PFM mode extends battery backup runtime during mains failure without sacrificing startup reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR51606XDBVR | 400-kHz PFM version; higher inductor size requirement; 40-µA IQ vs. 26.5-µA. | Better suited for cost-sensitive designs where board area is less constrained and EMI filtering is simpler at lower frequency. | Select when 400-kHz operation eases EMI compliance and thermal design allows larger inductor. |
| TPS560430DRCT | 0.6-A, 1-MHz, no PFM mode; 45-µA IQ; requires external compensation; 6-pin WSON package. | Used where constant-frequency operation is mandatory for spectral shaping, and layout allows WSON thermal relief. | Choose when FPWM-only behavior is acceptable and PCB stack-up supports WSON thermal vias. |
Compared with LMR51606XDBVR, the LMR51606YDBVR trades slightly higher switching loss at full load for superior light-load efficiency and smaller magnetics; versus TPS560430DRCT, it offers integrated compensation and PFM autonomy but lacks FPWM option and uses SOT-23 instead of WSON.
Availability
LMR51606YDBVR is available at Aetrix Electronics and suitable for PLC analog I/O modules, smart meter MCU power rails, and industrial HMI display backlight systems requiring stable component supply, long-term lifecycle support, and automotive-grade thermal robustness.
Supply support for LMR51606YDBVR 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 expertise in industrial-grade DC/DC conversion.
The LMR516xx family was engineered specifically for rugged industrial power conditioning-delivering wide-input, high-efficiency, small-footprint buck regulation in harsh thermal and electrical environments.
FAQ
What is the maximum input voltage transient the LMR51606YDBVR can withstand?
The LMR51606YDBVR supports input transients up to 70 V for durations under 10 ns, and continuous operation up to 65 V. This 5-V margin above rated max input provides robustness against inductive kickback and line surges in industrial 24-V and 48-V systems. The device remains functional and undamaged within these absolute ratings, as verified per TI's SLUSEY1B datasheet Section 6.1.
Does the LMR51606YDBVR require external compensation components?
No, the LMR51606YDBVR features fully internal compensation, eliminating the need for external Type-II or Type-III networks. This simplifies design, reduces BOM count, and ensures stability with common 10–100-µF ceramic output capacitors. The internal loop is optimized for the 1.1-MHz PFM operating point and validated across temperature and load per Section 7.3.1 of the datasheet.
Can the LMR51606YDBVR safely start into a pre-biased output?
Yes, the LMR51606YDBVR supports monotonic start-up into a pre-biased output-a critical feature for hot-swap and redundant power systems. During startup, the device controls inductor current to prevent reverse current flow and output voltage overshoot, as confirmed in Section 7.3.1 and Figure 7-1 of the official datasheet.
What is the purpose of the CB pin on the LMR51606YDBVR?
CB is the bootstrap capacitor terminal, used to generate gate drive voltage for the integrated high-side NMOS FET. A 100-nF X7R ceramic capacitor must be placed between CB and SW pins. This charge pump circuit refreshes during low-side conduction, enabling efficient synchronous rectification without an external driver. Layout guidelines specify short, low-inductance routing per Section 5 and Figure 5-1.
How does the LMR51606YDBVR protect against short-circuits?
The LMR51606YDBVR combines cycle-by-cycle peak current limiting and valley current limiting to detect overloads and hard shorts. Upon sustained fault, it enters hiccup mode-shutting down SW for ~30 ms before retrying. This prevents thermal damage while allowing automatic recovery, as detailed in Sections 7.3.6 and 6.5 (ILS_V(OC) = 0.62–0.98 A, TJ = –40°C to +150°C).
LMR51606YDBVR 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:
- 1.1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-6
LMR51606YDBVR FAQ
1.How can I place an order for LMR51606YDBVR through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR51606YDBVR 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 LMR51606YDBVR reliable?
The price and inventory of LMR51606YDBVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR51606YDBVR is usually 5 days.
3.What payment methods are accepted for LMR51606YDBVR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR51606YDBVR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR51606YDBVR?
LMR51606YDBVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR51606YDBVR 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 LMR51606YDBVR?
For technical support, including LMR51606YDBVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR51606YDBVR requirements.
6.How does Aetrix verify that LMR51606YDBVR is sourced from the original manufacturer or authorized distributors?
All LMR51606YDBVR 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 LMR51606YDBVR meets industry standards.
7.What is the process for return or replacement of LMR51606YDBVR?
All LMR51606YDBVR units undergo pre-shipment inspection (PSI). If there is an issue with LMR51606YDBVR, 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 LMR51606YDBVR part is unused and in its original packaging.
Return procedure for LMR51606YDBVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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