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Texas Instruments LMR50410YFQDBVRQ1
- Part No.:
- LMR50410YFQDBVRQ1
- Manufacturer:
- Texas Instruments
- Package:
- SOT-23-6
- Datasheet:
-
LMR50410YFQDBVRQ1.pdf
- Description:
- IC REG BUCK ADJ 1A SOT23-6
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LMR50410YFQDBVRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive-grade synchronous buck converter delivering 1-A continuous output current with 4-V to 36-V input range, 2.1-MHz fixed switching frequency, ±1% reference voltage accuracy, and FPWM mode for constant-frequency operation in automotive body electronics and ADAS power rails.
For engineers reviewing the LMR50410YFQDBVRQ1 datasheet, LMR50410YFQDBVRQ1 pinout, LMR50410YFQDBVRQ1 application, or LMR50410YFQDBVRQ1 equivalent, key selection considerations include FPWM vs PFM operational mode, 60-ns minimum on-time for high VIN-to-VOUT ratios, SOT-23-6 thermal performance (RθJB = 31°C/W), and precision enable with 130-mV hysteresis for reliable system sequencing.
Technical Context
The LMR50410YFQDBVRQ1 employs fixed-frequency peak-current mode control with internal compensation, enabling stable regulation using minimal external components. Its FPWM variant maintains constant 2.1-MHz switching across full load range, eliminating light-load frequency variation and minimizing output voltage ripple.
It integrates synchronous high-side (450 mΩ RDS-ON) and low-side (240 mΩ RDS-ON) MOSFETs, supports monotonic start-up into pre-biased outputs, and implements hiccup-mode short-circuit protection with 0.4-V FB fault threshold and thermal shutdown at 170°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4 V to 36 V - supports direct connection to automotive battery rail including cold-crank (4.5 V) and load-dump (36 V) transients. |
| Output Current | 1 A continuous - sufficient for powering microcontrollers, sensors, and interface ICs in infotainment and ADAS ECUs. |
| Switching Frequency | 2.1 MHz (fixed) - enables use of compact 1–2.2 µH inductors and reduces EMI filter size in space-constrained modules. |
| Reference Voltage | 1.0 V ±1% - ensures tight output regulation when paired with standard 1% feedback resistors. |
| Min. On-Time | 60 ns - allows stable 3.3-V or 5-V output generation even at 36-V input (D ≈ 9.2% at 36 V → 3.3 V). |
| Junction Temp Range | –40°C to +150°C - meets AEC-Q100 Grade 1 ambient requirement (–40°C to +125°C) with 25°C safety margin. |
| Enable Threshold | 1.1 V to 1.36 V rising - provides precise UVLO control via external resistor divider for battery monitoring and power sequencing. |
Pinout & Package
SOT-23-6 (DBV) package: 2.90 mm × 1.60 mm footprint, 0.95 mm height, thermally enhanced pad-less construction optimized for automotive PCB reliability and reflow compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CB | Bootstrap capacitor node | Connects 100-nF ceramic capacitor to SW pin to generate gate drive voltage for integrated high-side FET. |
| GND | Power ground | Internal source connection of low-side FET; must tie directly to system ground and CIN/COUT ground planes with shortest possible path. |
| FB | Voltage feedback input | Monitors output via resistor divider; 1.0-V reference sets VOUT = 1.0 × (1 + RFBT/RFBB); never short to GND during operation. |
| EN | Precision enable input | Active-high logic control with 130-mV hysteresis; supports system-level UVLO and sequencing without external comparators. |
| VIN | Main power input | Supplies internal bias LDO and high-side driver; requires local 4.7-µF ceramic bypass capacitor placed adjacent to pin. |
| SW | Switch node | Drives external power inductor; connects internally to drain of low-side FET and source of high-side FET; high di/dt node requiring tight layout. |
Key Features
| Feature | Design Value |
|---|---|
| FPWM operation mode | Ensures constant 2.1-MHz switching across 0–1-A load, eliminating audible noise and simplifying EMI filtering versus PFM variants. |
| Integrated synchronous rectification | Eliminates need for external Schottky diode, reducing BOM count and improving efficiency by ~5% at 1-A load vs asynchronous designs. |
| Internal soft-start | 1.8-ms ramp time prevents inrush current and output overshoot during startup into pre-biased loads. |
| Hiccup-mode short-circuit protection | Disables switching for 135 ms after overcurrent detection, limiting average power dissipation and enabling self-recovery without latch-off. |
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C ambient operation with extended life testing, HTOL, and ESD robustness per automotive standards. |
Applications
| Body Electronics Power Supply | ADAS Camera Module Rail |
|---|---|
Use Scenario: Powers door module MCU, window lift drivers, and LED interior lighting from vehicle battery with transient immunity. IC Role / Device Role / Timing Role: Primary 5-V or adjustable buck regulator providing clean, sequenced power with cold-crank support down to 4.5 V. Use Value: 2.1-MHz operation minimizes inductor size for tight packaging; FPWM mode ensures consistent EMI profile during variable load conditions like PWM dimming. | Use Scenario: Supplies image sensor, ISP, and SerDes in forward-facing camera ECU exposed to under-hood temperature extremes. IC Role / Device Role / Timing Role: High-reliability 3.3-V point-of-load regulator with monotonic start-up into pre-biased outputs during hot-plug events. Use Value: ±1% reference and 150°C junction rating guarantee stable sensor biasing across full automotive temperature range; hiccup protection avoids system lockup during cable short. |
| Infotainment System Core Rail | Automotive Gateway Power Management |
Use Scenario: Generates 1.2-V or 1.8-V core supply for ARM-based infotainment SoC with dynamic DVFS voltage scaling. IC Role / Device Role / Timing Role: Adjustable-output buck converter supporting programmable VDD_CORE with precision enable for power-state transitions. Use Value: 60-ns min on-time enables efficient 1.2-V output from 12-V battery; internal compensation eliminates loop stability tuning effort. | Use Scenario: Provides isolated 3.3-V supply for CAN FD transceivers and Ethernet PHYs in domain controller with multiple communication interfaces. IC Role / Device Role / Timing Role: Secondary regulated rail decoupled from main 5-V bus, featuring independent enable control for interface power gating. Use Value: Precision enable with 130-mV hysteresis allows accurate brown-out detection before CAN bus reset; SOT-23-6 footprint saves board area in multi-rail PMIC layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR50410YQDBVRQ1 | Same SOT-23-6 package and 2.1-MHz frequency, but uses PFM mode instead of FPWM - variable frequency below ~200 mA load. | Higher light-load efficiency (≥85% at 1 mA), but increased output ripple and potential EMI challenges in noise-sensitive systems. | Select when maximizing battery life in always-on modules outweighs EMI concerns; avoid in camera or radar signal chains. |
| TPS560430QDBVRQ1 | Pin-to-pin compatible SOT-23-6 buck with 2.1-MHz FPWM, but rated for 0.6-A max output and narrower 4.5–18-V input range. | Limited to lower-power domains (e.g., LIN transceivers, small MCUs); insufficient for 1-A ADAS or infotainment loads. | Choose only for cost-sensitive, low-current applications where 18-V max input suffices; verify thermal derating at 125°C ambient. |
Compared with LMR50410YQDBVRQ1, the LMR50410YFQDBVRQ1 trades light-load efficiency for deterministic EMI behavior and tighter regulation; versus TPS560430QDBVRQ1, it delivers 67% higher current and 100% wider input range - critical for under-hood and battery-direct applications.
Availability
LMR50410YFQDBVRQ1 is available at Aetrix Electronics and suitable for automotive body electronics, ADAS camera modules, and infotainment system power supplies requiring stable component supply, AEC-Q100 compliance, and long-term production continuity.
Supply support for LMR50410YFQDBVRQ1 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 solutions with deep automotive qualification expertise.
The LMR50410YFQDBVRQ1 belongs to TI's SIMPLE SWITCHER® automotive buck converter family, designed specifically for rugged, space-constrained DC-DC conversion in vehicle subsystems requiring AEC-Q100 compliance and functional safety readiness.
FAQ
What is the primary function of the LMR50410YFQDBVRQ1 in automotive power systems?
The LMR50410YFQDBVRQ1 functions as a synchronous step-down DC-DC converter that regulates unregulated automotive battery voltage (4 V–36 V) to stable, adjustable output voltages such as 3.3 V or 5 V. It delivers up to 1 A continuously while meeting AEC-Q100 Grade 1 requirements, making it ideal for powering MCUs, sensors, and interface ICs in harsh vehicle environments. Its FPWM mode ensures constant 2.1-MHz operation across all loads.
How does the FPWM mode of the LMR50410YFQDBVRQ1 differ from PFM mode in practical design?
The FPWM mode of the LMR50410YFQDBVRQ1 maintains a fixed 2.1-MHz switching frequency regardless of load, ensuring predictable EMI profiles and minimal output voltage ripple - essential for noise-sensitive ADAS and infotainment circuits. In contrast, PFM variants (e.g., LMR50410YQDBVRQ1) reduce frequency at light loads to improve efficiency but introduce variable ripple and potential audible noise. The LMR50410YFQDBVRQ1's FPWM behavior simplifies filtering and avoids interference with high-speed serial links.
Can the LMR50410YFQDBVRQ1 be used with a fixed 3.3-V output without external resistors?
No - the LMR50410YFQDBVRQ1 is the adjustable-output version and requires an external resistor divider on the FB pin to set VOUT. Fixed 3.3-V and 5.0-V variants exist (e.g., LMR50410Y3FQDBVRQ1 and LMR50410Y5FQDBVRQ1) with internal feedback networks. For the LMR50410YFQDBVRQ1, use Equation 1 from the datasheet: RFBT = RFBB × (VOUT / 1.0 V − 1), selecting RFBB = 100 kΩ and RFBT ≈ 230 kΩ for 3.3 V, with 1% tolerance resistors recommended.
What thermal performance can be expected from the LMR50410YFQDBVRQ1 in a typical 2-layer automotive PCB?
In a standard 2-layer PCB with 1-oz copper, the LMR50410YFQDBVRQ1 achieves approximately 80°C/W junction-to-ambient thermal resistance (RθJA), enabling 1-A operation up to +85°C ambient with proper copper pour and thermal vias under the GND pad. Its RθJB = 31°C/W indicates strong board conduction cooling - critical for automotive modules lacking forced airflow. Derating curves in the datasheet show ≥0.8 A available at +105°C ambient, confirming suitability for under-dash and head-unit applications.
Does the LMR50410YFQDBVRQ1 support monotonic start-up into a pre-biased output?
Yes - the LMR50410YFQDBVRQ1 features monotonic start-up capability, allowing safe activation when the output rail is already biased (e.g., by another regulator or leakage path). This prevents reverse current flow and output voltage undershoot during power sequencing in multi-rail automotive systems. Combined with internal soft-start (1.8 ms), this ensures controlled ramp-up even when VOUT starts at 3.3 V before EN assertion, protecting downstream logic and analog circuitry.
LMR50410YFQDBVRQ1 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):
- 36V
- Voltage - Output (Min/Fixed):
- 1V
- Voltage - Output (Max):
- 28V
- Current - Output:
- 1A
- Frequency - Switching:
- 2.1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-6
LMR50410YFQDBVRQ1 FAQ
1.How can I place an order for LMR50410YFQDBVRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR50410YFQDBVRQ1 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 LMR50410YFQDBVRQ1 reliable?
The price and inventory of LMR50410YFQDBVRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR50410YFQDBVRQ1 is usually 5 days.
3.What payment methods are accepted for LMR50410YFQDBVRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR50410YFQDBVRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR50410YFQDBVRQ1?
LMR50410YFQDBVRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR50410YFQDBVRQ1 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 LMR50410YFQDBVRQ1?
For technical support, including LMR50410YFQDBVRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR50410YFQDBVRQ1 requirements.
6.How does Aetrix verify that LMR50410YFQDBVRQ1 is sourced from the original manufacturer or authorized distributors?
All LMR50410YFQDBVRQ1 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 LMR50410YFQDBVRQ1 meets industry standards.
7.What is the process for return or replacement of LMR50410YFQDBVRQ1?
All LMR50410YFQDBVRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMR50410YFQDBVRQ1, 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 LMR50410YFQDBVRQ1 part is unused and in its original packaging.
Return procedure for LMR50410YFQDBVRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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