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Texas Instruments LMR50410YQDBVRQ1
- Part No.:
- LMR50410YQDBVRQ1
- Manufacturer:
- Texas Instruments
- Package:
- SOT-23-6
- Datasheet:
-
LMR50410YQDBVRQ1.pdf
- Description:
- IC REG BUCK ADJ 1A SOT23-6
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LMR50410YQDBVRQ1 from Texas Instruments is an AEC-Q100 Grade 1 qualified synchronous buck converter for automotive power conditioning, 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 monotonic start-up into pre-biased outputs - deployed in body electronics, infotainment, and ADAS subsystems.
For engineers reviewing the LMR50410YQDBVRQ1 datasheet, LMR50410YQDBVRQ1 pinout, LMR50410YQDBVRQ1 application, or LMR50410YQDBVRQ1 equivalent, key selection considerations include PFM-mode light-load efficiency, 60-ns minimum on-time for high VIN-to-VOUT ratios, SOT-23-6 thermal performance (RθJB = 31°C/W), and precision enable with adjustable UVLO via external resistor divider.
Technical Context
The LMR50410YQDBVRQ1 implements fixed-frequency peak-current mode control with internal compensation, supporting both PFM (for >90% efficiency at 1-mA load) and FPWM variants - this specific part (YQDBVRQ1) is the PFM version. It integrates high-side (450 mΩ) and low-side (240 mΩ) NMOS switches, uses a bootstrap capacitor (CB–SW) for gate drive, and features cycle-by-cycle current limiting with hiccup-mode short-circuit protection.
Its functional safety capability includes documentation support for ISO 26262 ASIL-B system integration, while thermal shutdown (170°C trip / 158°C recovery) and input UVLO (3.75 V rising / 3.45 V falling) ensure robust operation across –40°C to 125°C ambient. The device operates in CCM/DCM boundary and employs frequency foldback below 133 kHz when minimum on/off time limits are reached.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4 V to 36 V - supports direct connection to automotive battery (cold-crank down to 4.5 V, load-dump up to 36 V) |
| Output Current | 1 A continuous - sufficient for powering microcontrollers, sensors, and interface ICs in automotive modules |
| Switching Frequency | 2.1 MHz (±15%) - enables use of ≤2.2-µH inductors and compact 1206/0805 ceramic capacitors |
| Reference Voltage | 1.00 V ±1% - ensures ≤±2.5% output regulation over temperature and line/load for adjustable designs |
| Min. On-Time | 60 ns - allows ≥9:1 step-down ratio (e.g., 36 V → 3.3 V) without requiring frequency foldback at full load |
| Junction Temp Range | –40°C to 150°C - validated for under-hood placement with PCB-level thermal management |
| Enable Threshold | 1.23 V typical high-level / 1.1 V typical low-level - supports precise system-level UVLO with external resistor divider |
Pinout & Package
SOT-23-6 (DBV) package, 2.90 mm × 1.60 mm body size, exposed pad not present - optimized for space-constrained automotive PCBs with standard reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CB | Bootstrap capacitor node | Connects 100-nF X7R ceramic capacitor to SW; supplies gate drive voltage for integrated high-side FET |
| GND | Power ground | Common return for internal low-side FET source, CIN, COUT, and PCB ground plane - requires shortest possible trace to CIN |
| FB | Feedback input | Analog input sensing output voltage via resistor divider; open-loop reference is 1.00 V - never short to GND during operation |
| EN | Enable control | Active-high digital input; precision threshold enables system-level UVLO or sequencing - must not float or exceed VIN + 0.3 V |
| VIN | Main power input | Supplies internal bias LDO and high-side switch; connect directly to CIN (≥4.7 µF X5R/X7R) with minimal loop area |
| SW | Switch node | Drives external power inductor; internally connects high-side drain and low-side source - critical for EMI layout and thermal path |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for –40°C to 125°C ambient operation - meets automotive reliability and stress-test requirements |
| Integrated synchronous rectification | Eliminates external Schottky diode - reduces BOM count and improves efficiency by ~5% vs. asynchronous design |
| Internal soft-start (1.8 ms) | Prevents inrush current and output overshoot during power-up - no external capacitor required |
| Hiccup-mode short-circuit protection | Shuts down for 135 ms after fault detection - prevents thermal runaway during sustained overload or output short |
| Monotonic start-up into pre-biased output | Enables safe hot-plug operation without reverse current flow - critical for multi-rail power sequencing |
| Fixed 2.1-MHz switching | Enables consistent EMI filtering design and avoids AM/FM radio band interference (0.54–1.6 MHz) |
Applications
| Body Electronics & Lighting | Infotainment & Cluster |
|---|---|
Use Scenario: Powering LED driver ICs and CAN transceivers in door modules and ambient lighting controllers. IC Role / Device Role / Timing Role: Primary 5-V or 3.3-V supply regulator converting raw battery voltage to stable logic rail. Use Value: 2.1-MHz operation minimizes inductor size for tight module envelopes; PFM mode extends battery runtime in standby states. | Use Scenario: Supplying display timing controllers (TCON), touch screen processors, and audio codecs in center-stack displays. IC Role / Device Role / Timing Role: Point-of-load DC-DC converter delivering low-noise 3.3-V rail with <±2.5% regulation across temperature. Use Value: ±1% reference and internal compensation ensure stable output without tuning - reducing validation time for display subsystems. |
| ADAS Camera Modules | General Purpose Wide VIN Supplies |
Use Scenario: Providing clean 1.8-V or 2.8-V bias to image sensors and SerDes links in surround-view camera ECUs. IC Role / Device Role / Timing Role: Secondary regulated rail derived from main 5-V bus, using resistor-divider feedback for precise voltage setting. Use Value: 60-ns min on-time supports 5-V-to-1.8-V conversion at full load without frequency foldback - maintaining constant 2.1-MHz EMI profile. | Use Scenario: Replacing linear regulators in industrial telematics gateways requiring 3.3-V/5-V rails from 9–36-V input. IC Role / Device Role / Timing Role: High-efficiency buck converter enabling >85% efficiency at 1-A load - reducing thermal load vs. LDO-based solutions. Use Value: SOT-23-6 footprint and internal MOSFETs eliminate discrete FETs and drivers - cutting solution size by >40% vs. controller+MOSFET approach. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR50410YFQDBVRQ1 | FPWM variant - fixed 2.1-MHz operation across full load range; higher light-load ripple but tighter regulation | Preferred where constant frequency and low output voltage ripple are mandatory (e.g., RF-sensitive ADC supplies) | Select LMR50410YFQDBVRQ1 if EMI predictability outweighs light-load efficiency; otherwise retain LMR50410YQDBVRQ1 for battery-powered standby modes |
| TPS560430QDBVRQ1 | Pin-to-pin compatible; same SOT-23-6 package, 4–36-V input, 1-A rating, but 1.4-MHz switching and no PFM mode | Better suited for cost-sensitive non-safety-critical applications lacking functional safety documentation requirements | Choose TPS560430QDBVRQ1 only if AEC-Q100 documentation support and functional safety capability are not required |
Compared with LMR50410YFQDBVRQ1, the LMR50410YQDBVRQ1 trades constant-frequency operation for superior light-load efficiency (PFM), while versus TPS560430QDBVRQ1 it adds functional safety documentation and tighter reference tolerance - making it the sole choice for ASIL-B-compliant automotive subsystems requiring high accuracy and low quiescent current.
Availability
LMR50410YQDBVRQ1 is available at Aetrix Electronics and suitable for automotive body electronics, infotainment systems, and ADAS camera modules requiring stable component supply across extended temperature and long production lifecycles.
Supply support for LMR50410YQDBVRQ1 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 automotive-grade power management ICs - with over 40 years of automotive qualification experience.
The LMR50410-Q1 product line delivers compact, AEC-Q100-qualified buck converters for demanding automotive environments - designed specifically to replace legacy linear regulators and discrete switchers in space- and thermal-constrained ECUs.
FAQ
What is the maximum input voltage the LMR50410YQDBVRQ1 can withstand?
The LMR50410YQDBVRQ1 has an absolute maximum input voltage rating of 38 V, but its recommended operating range is 4 V to 36 V. This 36-V upper limit accommodates automotive load-dump transients per ISO 7637-2 Pulse 5a, ensuring reliable operation in 24-V commercial vehicle systems and 12-V passenger car applications with transient overvoltage conditions.
Does the LMR50410YQDBVRQ1 require external compensation components?
No, the LMR50410YQDBVRQ1 features fully internal compensation - eliminating the need for external Type-II or Type-III compensation networks. This simplifies design, reduces bill-of-materials count, and guarantees stability across all recommended output capacitor types (including low-ESR ceramics), provided layout guidelines for feedback trace routing and grounding are followed.
How does the LMR50410YQDBVRQ1 handle short-circuit conditions?
The LMR50410YQDBVRQ1 responds to output short circuits with hiccup-mode protection: it shuts down for 135 ms after detecting overcurrent, then attempts automatic restart. This cycle repeats until the fault clears, preventing thermal damage and enabling self-recovery without manual intervention - a critical feature for unattended automotive modules like rearview cameras or seat controllers.
Can the LMR50410YQDBVRQ1 be used with a fixed 3.3-V output configuration?
No - the LMR50410YQDBVRQ1 is the adjustable-output PFM variant. Fixed 3.3-V and 5.0-V versions exist as separate orderable parts (LMR50410Y3FQDBVRQ1 and LMR50410Y5FQDBVRQ1). For LMR50410YQDBVRQ1, output voltage is set externally via a resistor divider connected to the FB pin, with nominal 1.00-V reference enabling precise 3.3-V, 5.0-V, or other values.
What is the thermal resistance from junction to board (RθJB) for the LMR50410YQDBVRQ1 in SOT-23-6?
The LMR50410YQDBVRQ1 in SOT-23-6 (DBV) package has a simulated junction-to-board thermal resistance (RθJB) of 31°C/W, measured on a 4-layer JEDEC-standard PCB. This value reflects heat transfer through the package bottom into the copper pour - enabling accurate estimation of junction temperature rise under real PCB layouts with adequate thermal vias and ground plane area.
LMR50410YQDBVRQ1 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
LMR50410YQDBVRQ1 FAQ
1.How can I place an order for LMR50410YQDBVRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR50410YQDBVRQ1 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 LMR50410YQDBVRQ1 reliable?
The price and inventory of LMR50410YQDBVRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR50410YQDBVRQ1 is usually 5 days.
3.What payment methods are accepted for LMR50410YQDBVRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR50410YQDBVRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR50410YQDBVRQ1?
LMR50410YQDBVRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR50410YQDBVRQ1 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 LMR50410YQDBVRQ1?
For technical support, including LMR50410YQDBVRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR50410YQDBVRQ1 requirements.
6.How does Aetrix verify that LMR50410YQDBVRQ1 is sourced from the original manufacturer or authorized distributors?
All LMR50410YQDBVRQ1 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 LMR50410YQDBVRQ1 meets industry standards.
7.What is the process for return or replacement of LMR50410YQDBVRQ1?
All LMR50410YQDBVRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMR50410YQDBVRQ1, 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 LMR50410YQDBVRQ1 part is unused and in its original packaging.
Return procedure for LMR50410YQDBVRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMR50410YQDBVRQ1 Tags
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