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Texas Instruments LMR14050SSQDDAQ1
- Part No.:
- LMR14050SSQDDAQ1
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LMR14050SSQDDAQ1.pdf
- Description:
- IC REG BUCK ADJ 5A 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:966
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Product details
Overview
LMR14050SSQDDAQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive-grade synchronous step-down DC-DC converter with integrated 90 mΩ high-side MOSFET, delivering 5 A continuous output current across 4 V to 40 V input range, featuring 40 µA quiescent current and spread-spectrum EMI reduction - used in battery regulation for ADAS domain controllers and infotainment head units.
For engineers reviewing the LMR14050SSQDDAQ1 datasheet, LMR14050SSQDDAQ1 pinout, LMR14050SSQDDAQ1 application, or LMR14050SSQDDAQ1 equivalent, key selection considerations include its 75 ns minimum on-time, 200 kHz–2.5 MHz adjustable switching frequency, thermal shutdown at 170°C, precision enable threshold (1.2 V), and feedback reference voltage of 0.750 V.
Technical Context
The LMR14050SSQDDAQ1 implements fixed-frequency peak current mode control with internal loop compensation, enabling stable operation without external compensation components. Its sleep-mode operation reduces IQ to 40 µA under light load while maintaining regulation via COMP voltage clamping at 400 mV.
It supports high-duty-cycle operation up to 97% via bootstrap capacitor recharge circuitry and integrates cycle-by-cycle current limiting, overvoltage protection, and thermal shutdown. The RT/SYNC pin enables either resistor-programmed frequency setting or synchronization to an external clock (250 kHz–2.3 MHz) with PLL lock-in time of 100 µs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4 V to 40 V - supports direct connection to automotive battery rails including cold-crank (4.5 V) and load-dump (40 V) transients. |
| Output Current | 5 A continuous - sufficient to power multi-rail SoCs, radar processors, or display subsystems without external current boosting. |
| Quiescent Current | 40 µA - enables >1-year standby battery life in always-on vehicle modules such as telematics or gateway ECUs. |
| Switching Frequency | 200 kHz to 2.5 MHz - allows trade-off between inductor size (higher fSW) and efficiency (lower fSW), with external sync capability for noise-sensitive domains. |
| Feedback Reference | 0.750 V ±1.5% - enables precise output voltage setting (e.g., 1.8 V, 3.3 V, 5 V) using standard 1% resistors with minimal error contribution. |
| High-Side RDS(on) | 90 mΩ typical - reduces conduction loss and thermal stress at full load, supporting compact thermal design in HSOIC-8 PowerPAD™ package. |
| Min. On-Time | 75 ns - enables high step-down ratios (e.g., 24 V → 1.2 V at 500 kHz) without pulse-skipping instability. |
| Thermal Shutdown | 170°C with 12°C hysteresis - protects against sustained overload or poor PCB heatsinking while allowing safe recovery after fault clearance. |
Pinout & Package
LMR14050SSQDDAQ1 is housed in an 8-pin HSOIC (DDA) package with exposed thermal pad (4.9 mm × 6 mm), optimized for automotive board space constraints and thermal performance (RθJA = 43.2°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOT | Bootstrap supply | Drives high-side MOSFET gate; requires 0.1 µF X7R ceramic capacitor to SW for reliable 5 A switching. |
| VIN | Main power input | Accepts 4–40 V; must be decoupled with low-ESR ceramic capacitors placed adjacent to pin to minimize high-frequency ringing. |
| EN | Enable control | Logic-compatible input with 1.2 V threshold and internal 1 µA pull-up; supports system-level UVLO via external resistor divider. |
| RT/SYNC | Frequency control | Configurable as resistor-set oscillator (200 kHz–2.5 MHz) or high-impedance sync input (250 kHz–2.3 MHz) with automatic mode switching. |
| FB | Voltage feedback | Monitors output via resistor divider; 0.750 V reference enables accurate regulation independent of temperature or line variation. |
| SS | Soft-start timing | Controls output ramp rate via external capacitor; prevents inrush into large output capacitance or downstream LDOs. |
| GND | Power ground | Reference for all analog and power circuits; must be connected to solid PCB ground plane for EMI and thermal performance. |
| SW | Power switch node | Connects to external inductor; high di/dt node requiring tight layout and Kelvin return path to minimize switching losses. |
Key Features
| Feature | Design Value |
|---|---|
| Spread-spectrum modulation | Reduces peak EMI by ±6% frequency dithering - meets CISPR 25 Class 5 requirements without added shielding or filter components. |
| Internal compensation | Eliminates need for external Type II/III compensation network - cuts BOM count by ≥3 parts and accelerates design validation. |
| Precision enable with UVLO hysteresis | Enables robust power sequencing and battery undervoltage protection using two external resistors - no additional supervisor IC required. |
| 97% max duty cycle | Supports ultra-low dropout operation (e.g., 5.5 V → 5.0 V at 5 A), critical for post-buck regulation in 12 V automotive systems. |
| Thermal and fault protection | Integrated thermal shutdown, output overvoltage, and cycle-by-cycle current limit - ensures fail-safe behavior during short-circuit or overtemperature events. |
| Automotive qualification | AEC-Q100 Grade 1 (–40°C to +125°C ambient), HBM ±2 kV / CDM ±750 V - validated for under-hood and cockpit applications. |
Applications
| ADAS Domain Controller Power | Infotainment Head Unit Supply |
|---|---|
Use Scenario: Powers 12 nm SoC, DDR4 memory, and GPU in front-camera or radar fusion ECU operating continuously in engine bay environment. IC Role / Device Role / Timing Role: Primary buck regulator delivering 1.1 V @ 4 A and 1.8 V @ 2 A via dual-output configuration with sequenced enable. Use Value: 40 µA IQ extends backup battery runtime during ignition-off monitoring; spread spectrum avoids interference with 77 GHz radar band. | Use Scenario: Supplies 3.3 V and 5 V rails for touchscreen controller, audio codec, and USB-C PD interface in center-stack display. IC Role / Device Role / Timing Role: Main system regulator with soft-start synchronized to MCU reset signal to prevent brown-out during boot. Use Value: 75 ns min on-time enables clean 24 V → 3.3 V conversion at 2 MHz, minimizing inductor size for slim bezel mechanical design. |
| Telematics Control Unit (TCU) | Body Control Module (BCM) Subsystem |
Use Scenario: Provides always-on 3.3 V rail for LTE modem, GNSS receiver, and CAN FD transceivers in cellular-connected vehicle gateway. IC Role / Device Role / Timing Role: Low-IQ buck converter with precision enable managing wake-on-LTE and periodic GPS polling cycles. Use Value: 1 µA shutdown current preserves 12 V lead-acid battery for >3 months during vehicle storage; AEC-Q100 qualification ensures reliability over 15-year lifecycle. | Use Scenario: Regulates 5 V for microcontroller, LIN transceivers, and LED drivers in door module or lighting ECU. IC Role / Device Role / Timing Role: Secondary buck stage following primary 12 V → 5 V conversion, handling transient loads from window motor actuation. Use Value: 90 mΩ RDS(on) and thermal pad reduce junction temperature rise by 22°C vs. discrete solutions, improving long-term solder joint reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR14030SQDDAQ1 | 3.5 A output current, identical pinout and package, same 40 µA IQ and spread-spectrum feature set. | Suitable where peak load current remains ≤3.5 A - reduces thermal margin requirement and simplifies heatsinking. | Select when system load profile confirms <3.5 A continuous demand and cost optimization is prioritized over headroom. |
| TPS54560QDGQRQ1 | 60 V input rating, 5 A output, but higher 145 µA IQ and no spread-spectrum; uses different 10-pin MSOP package. | Better suited for trucks or commercial vehicles with 24 V nominal systems subject to higher transients; lacks EMI-reduction features. | Choose only if input voltage exceeds 40 V or if TI's SIMPLE SWITCHER® ecosystem compatibility is not required. |
Compared with LMR14030SQDDAQ1, the LMR14050SSQDDAQ1 provides 1.5 A higher current headroom for future-proofing and transient tolerance; versus TPS54560QDGQRQ1, it delivers superior EMI performance and lower quiescent current at the cost of reduced input voltage range.
Availability
LMR14050SSQDDAQ1 is available at Aetrix Electronics and suitable for automotive ADAS, infotainment, and telematics applications requiring stable component supply, long-lifecycle support, and AEC-Q100 compliance.
Supply support for LMR14050SSQDDAQ1 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 company headquartered in Dallas, Texas, designing and manufacturing analog and embedded processing chips for industrial, automotive, and personal electronics markets.
The LMR14050SSQDDAQ1 belongs to TI's SIMPLE SWITCHER® automotive power converter family, engineered specifically for robust, low-EMI, high-efficiency DC-DC conversion in safety-critical vehicle subsystems.
FAQ
What is the maximum input voltage rating for the LMR14050SSQDDAQ1?
The LMR14050SSQDDAQ1 has an absolute maximum input voltage rating of 44 V, with recommended operating range from 4 V to 40 V. This allows reliable operation during automotive load-dump events (ISO 7637-2 Pulse 5a) without external clamping, provided proper input capacitance and layout practices are followed per TI's LMR14050-Q1 layout guidelines.
Does the LMR14050SSQDDAQ1 support external frequency synchronization?
Yes, the LMR14050SSQDDAQ1 supports external clock synchronization via the RT/SYNC pin across 250 kHz to 2.3 MHz. When driven above the PLL upper threshold (~1.7 V), the internal oscillator disables and the pin becomes a high-impedance sync input; falling edges trigger PLL lock-in within 100 µs. No additional components are needed beyond AC coupling if driving from a low-impedance source.
How does the spread-spectrum feature of the LMR14050SSQDDAQ1 reduce EMI?
The LMR14050SSQDDAQ1 spreads its switching frequency by ±6% around the center value using dithering, which distributes radiated energy across a wider bandwidth. This lowers peak emissions by up to 10 dB compared to fixed-frequency operation - enabling compliance with CISPR 25 Class 5 limits in automotive environments without added ferrite beads or metal shielding.
What is the purpose of the SS pin on the LMR14050SSQDDAQ1?
The SS (soft-start) pin on the LMR14050SSQDDAQ1 controls output voltage ramp-up time via an external capacitor. An internal 3 µA current source charges the capacitor to generate a controlled voltage ramp applied to the error amplifier, preventing inrush current into large output capacitors or downstream regulators. Typical values range from 1 nF to 4.7 nF depending on desired startup time.
Can the LMR14050SSQDDAQ1 operate in dropout condition, and what is its maximum duty cycle?
Yes, the LMR14050SSQDDAQ1 supports high-duty-cycle operation up to 97%, enabled by its bootstrap capacitor recharge circuit. When VIN approaches VOUT, the device maintains regulation by extending on-time and periodically pulling SW low to refresh BOOT. This allows stable operation down to ~5.2 V input for a 5 V output, making it suitable for post-regulation in 12 V systems.
LMR14050SSQDDAQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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):
- 40V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 28V
- Current - Output:
- 5A
- Frequency - Switching:
- 200kHz ~ 2.5MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO PowerPad
LMR14050SSQDDAQ1 FAQ
1.How can I place an order for LMR14050SSQDDAQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR14050SSQDDAQ1 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 LMR14050SSQDDAQ1 reliable?
The price and inventory of LMR14050SSQDDAQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR14050SSQDDAQ1 is usually 5 days.
3.What payment methods are accepted for LMR14050SSQDDAQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR14050SSQDDAQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR14050SSQDDAQ1?
LMR14050SSQDDAQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR14050SSQDDAQ1 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 LMR14050SSQDDAQ1?
For technical support, including LMR14050SSQDDAQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR14050SSQDDAQ1 requirements.
6.How does Aetrix verify that LMR14050SSQDDAQ1 is sourced from the original manufacturer or authorized distributors?
All LMR14050SSQDDAQ1 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 LMR14050SSQDDAQ1 meets industry standards.
7.What is the process for return or replacement of LMR14050SSQDDAQ1?
All LMR14050SSQDDAQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMR14050SSQDDAQ1, 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 LMR14050SSQDDAQ1 part is unused and in its original packaging.
Return procedure for LMR14050SSQDDAQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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