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Texas Instruments LMR14050SSQDDARQ1
- Part No.:
- LMR14050SSQDDARQ1
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LMR14050SSQDDARQ1.pdf
- Description:
- IC REG BUCK ADJ 5A 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:14,538
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Product details
Overview
LMR14050SSQDDARQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive-grade synchronous step-down DC-DC converter with integrated 90 mΩ high-side MOSFET, 4 V to 40 V input range, 5 A continuous output current, 40 µA quiescent current in sleep mode, and spread-spectrum EMI reduction. It delivers regulated 0.8 V to 28 V output for battery-powered vehicle subsystems requiring low standby power and robust thermal performance.
For engineers reviewing the LMR14050SSQDDARQ1 datasheet, LMR14050SSQDDARQ1 pinout, LMR14050SSQDDARQ1 application, or LMR14050SSQDDARQ1 equivalent, key selection criteria include its 75 ns minimum on-time, 200 kHz–2.5 MHz adjustable switching frequency, internal compensation, precision enable input, and HSOIC-8 PowerPAD™ package optimized for automotive thermal and layout constraints.
Technical Context
The LMR14050SSQDDARQ1 implements fixed-frequency peak current mode control with slope compensation to ensure stability at duty cycles >50%. Its sleep-mode operation reduces switching losses at light load by clamping COMP voltage at 400 mV and drawing only 40 µA IQ, while maintaining regulation via periodic burst-mode recovery.
Spread-spectrum dithering (±6% center frequency) is enabled via factory configuration for this variant, reducing peak EMI without external components. The device supports high-duty-cycle dropout operation (up to ~97%) using bootstrap capacitor recharge logic and integrates cycle-by-cycle current limiting, thermal shutdown (170°C), and output overvoltage protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4 V to 40 V - supports direct connection to automotive battery (cold-crank down to 4 V) and wide industrial input sources. |
| Output Current | 5 A continuous - sufficient for powering ADAS sensors, infotainment processors, or body control modules without external current boosting. |
| Quiescent Current | 40 µA in sleep mode - enables >1-year battery hold-up in always-on vehicle systems (e.g., telematics, alarm controllers). |
| Switching Frequency | 200 kHz to 2.5 MHz - adjustable via RT resistor or synchronizable to external clock (250 kHz–2.3 MHz) for EMI compliance and layout optimization. |
| High-Side RDS(on) | 90 mΩ typical - minimizes conduction loss at full load, enabling >90% efficiency at 12 VIN/5 VOUT with proper layout. |
| Min. On-Time | 75 ns - supports high VIN-to-VOUT conversion ratios (e.g., 36 V → 3.3 V) without pulse-skipping instability. |
| Feedback Reference | 0.750 V ±1.2% - enables precise output regulation across –40°C to 125°C ambient, critical for automotive sensor power rails. |
Pinout & Package
LMR14050SSQDDARQ1 uses an 8-pin HSOIC package with exposed thermal pad (DDA), measuring 4.9 mm × 6 mm. The PowerPAD™ enhances thermal dissipation (RθJA = 43.2°C/W), enabling 5 A operation in compact automotive PCB layouts without forced airflow.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOT | Bootstrap supply | Connects 0.1 µF ceramic capacitor to SW; supplies gate drive voltage for integrated high-side MOSFET during high-duty-cycle operation. |
| VIN | Main power input | Accepts 4–40 V input; requires low-ESR bulk and high-frequency bypass capacitors placed adjacent to pin for stable switching. |
| EN | Enable control | Precision analog input with 1.2 V threshold and hysteresis; supports system-level UVLO programming via resistor divider for battery monitoring. |
| RT/SYNC | Frequency control | Configurable as resistor-set oscillator (200 kHz–2.5 MHz) or high-impedance sync input (250 kHz–2.3 MHz) - no external pull-up needed. |
| FB | Voltage feedback | Connects to resistor divider; senses 0.75 V reference to regulate output; high-impedance input minimizes loading error. |
| SS | Soft-start timing | Sinks 3 µA current to charge external capacitor; sets monotonic output ramp time to prevent inrush into downstream loads. |
| GND | System ground | Power and signal return; must be connected to large copper pour tied to thermal pad for optimal thermal and EMI performance. |
| SW | Power switch node | Drives external inductor; high dv/dt node requiring tight loop area and guard ring to minimize radiated emissions. |
Key Features
| Feature | Design Value |
|---|---|
| Spread-spectrum modulation | Factory-enabled ±6% frequency dithering reduces peak EMI amplitude without altering average switching frequency or requiring layout changes. |
| Internal compensation | Eliminates need for external Type II/III compensation network - reduces BOM count, design time, and sensitivity to output capacitor ESR variation. |
| Thermal protection | 170°C junction shutdown with 12°C hysteresis prevents permanent damage during overload or poor heatsinking; resumes operation after cooldown. |
| Precision enable input | 1.2 V threshold with programmable hysteresis allows reliable sequencing with battery voltage monitors or microcontroller GPIOs without level-shifting. |
| Ultra-low shutdown current | 1 µA max shutdown current extends vehicle battery life during extended parking - critical for always-on telematics and security modules. |
Applications
| Automotive Battery Regulation | ADAS Sensor Power Supply |
|---|---|
Use Scenario: Regulating 12 V battery rail to 5 V/3.3 V for camera modules, radar ECUs, and parking assist controllers in engine-off conditions. IC Role / Device Role / Timing Role: Primary buck regulator delivering stable, low-noise power with sleep-mode IQ < 40 µA to preserve battery during multi-week vehicle dormancy. Use Value: Enables >1-year battery hold-up without parasitic drain exceeding OEM specifications, meeting ISO 16750-2 cold-crank and quiescent current requirements. | Use Scenario: Powering CMOS image sensors and SoCs in forward-facing ADAS cameras where EMI must not interfere with RF receivers or CAN bus integrity. IC Role / Device Role / Timing Role: Spread-spectrum synchronized buck converter operating at 2.1 MHz to avoid AM/FM and GPS bands while maintaining 5 A capability. Use Value: Reduces conducted and radiated EMI peaks by >10 dB compared to fixed-frequency operation, easing CISPR 25 Class 5 compliance without shielding or ferrites. |
| Infotainment System Core Rail | Body Control Module (BCM) Subsystem |
Use Scenario: Generating 1.1 V/1.8 V core voltages for infotainment SoCs (e.g., TI Jacinto, NXP i.MX) from 12 V battery with dynamic load steps up to 4 A. IC Role / Device Role / Timing Role: High-efficiency synchronous buck with 75 ns min-on-time supporting 12 V → 1.1 V conversion at 2 MHz for compact inductor selection. Use Value: Delivers >88% efficiency at full load and maintains regulation during 10 A/s transient steps, eliminating need for secondary LDOs or oversized output capacitance. | Use Scenario: Powering LIN transceivers, LED drivers, and microcontrollers in door modules and seat controllers where space and thermal headroom are constrained. IC Role / Device Role / Timing Role: Compact HSOIC-8 buck converter with integrated thermal pad providing 5 A capacity in <30 mm² footprint, supporting high-temperature cabin environments. Use Value: Achieves 125°C ambient operation with no derating using standard 2-oz copper PCB, reducing need for thermal vias or heatsinks in cost-sensitive BCM designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR14050QDPRRQ1 | Same electrical specs but in 10-pin WSON (4 mm × 4 mm) package with PGOOD pin; RθJA = 36.5°C/W vs. 43.2°C/W. | Preferred for space-constrained layouts needing PGOOD flag and lower thermal resistance; lacks spread-spectrum feature. | Select when board area is premium and system-level power-good signaling is required; verify PGOOD pull-up compatibility. |
| LM61480QRNRRQ1 | Higher 8 A rating, 2.2 MHz fixed frequency, 15 µA IQ, but no spread-spectrum or adjustable frequency; uses 16-pin QFN. | Better for high-current ADAS ECUs needing minimal IQ and higher current margin; not pin-compatible and requires different layout. | Choose for next-gen platforms targeting lower IQ and higher current, accepting larger footprint and loss of frequency flexibility. |
Compared with LMR14050QDPRRQ1, the LMR14050SSQDDARQ1 trades PGOOD functionality and thermal performance for spread-spectrum EMI reduction in a mature HSOIC package; versus LM61480QRNRRQ1, it offers frequency tuning and EMI control at lower current and higher IQ - making it optimal for cost-sensitive, EMI-regulated automotive subsystems.
Availability
LMR14050SSQDDARQ1 is available at Aetrix Electronics and suitable for automotive battery regulation, ADAS sensor power supplies, and infotainment system core rails requiring stable component supply across extended temperature and long-lifecycle programs.
Supply support for LMR14050SSQDDARQ1 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 ICs, with deep expertise in automotive-grade reliability and functional safety.
The LMR14050SSQDDARQ1 belongs to TI's SIMPLE SWITCHER® automotive power converter family, designed specifically for AEC-Q100-compliant DC-DC regulation in harsh-temperature vehicle environments where low IQ, EMI control, and long-term supply stability are mandatory.
FAQ
What is the purpose of the SS pin on the LMR14050SSQDDARQ1?
The SS (soft-start) pin on the LMR14050SSQDDARQ1 sinks a precise 3 µA internal current to charge an external capacitor, generating a controlled voltage ramp that linearly increases the output voltage during startup. This prevents inrush current into downstream loads and input capacitors, protecting both the LMR14050SSQDDARQ1 and connected circuitry. The soft-start time is programmable via CSS value and resets automatically during shutdown or thermal fault.
Does the LMR14050SSQDDARQ1 support synchronization to an external clock?
Yes, the LMR14050SSQDDARQ1 supports external clock synchronization via the RT/SYNC pin, accepting square-wave inputs from 250 kHz to 2.3 MHz. When the pin voltage exceeds the PLL upper threshold (~1.7 V), the internal oscillator disables and locks to the falling edge of the external clock. This enables deterministic EMI placement and system-level timing coordination - essential for automotive domain controllers sharing clock domains.
How does the spread-spectrum feature work in the LMR14050SSQDDARQ1?
The LMR14050SSQDDARQ1 implements factory-configured spread-spectrum modulation that dithers the switching frequency by ±6% around the center value set by the RT resistor or SYNC clock. This spreads energy across a wider bandwidth, reducing peak radiated and conducted EMI amplitudes without affecting average frequency, efficiency, or thermal performance - directly addressing CISPR 25 Class 5 requirements for automotive electronics.
What is the maximum duty cycle supported by the LMR14050SSQDDARQ1?
The LMR14050SSQDDARQ1 supports up to approximately 97% duty cycle in dropout conditions, enabled by its integrated bootstrap capacitor recharge circuit. When the high-side MOSFET remains on for multiple consecutive cycles (5–11 depending on frequency), the device detects BOOT-to-SW voltage decay below 3.2 V and briefly turns off the high-side switch to refresh the BOOT capacitor via the low-side path - sustaining regulation even at VIN–VOUT < 1 V.
Is the LMR14050SSQDDARQ1 pin-compatible with other devices in the LMR140xx-Q1 family?
Yes, the LMR14050SSQDDARQ1 in the HSOIC-8 (DDA) package is pin-compatible with the LMR14020-Q1 (2 A) and LMR14030-Q1 (3.5 A) variants, sharing identical pinout, footprint, and thermal pad layout. This enables scalable power design - allowing hardware reuse across vehicle platforms with differing current requirements while maintaining identical PCB layout and bill-of-materials structure.
LMR14050SSQDDARQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 8-PowerSOIC (0.154", 3.90mm Width)
- 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):
- 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
LMR14050SSQDDARQ1 FAQ
1.How can I place an order for LMR14050SSQDDARQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR14050SSQDDARQ1 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 LMR14050SSQDDARQ1 reliable?
The price and inventory of LMR14050SSQDDARQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR14050SSQDDARQ1 is usually 5 days.
3.What payment methods are accepted for LMR14050SSQDDARQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR14050SSQDDARQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR14050SSQDDARQ1?
LMR14050SSQDDARQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR14050SSQDDARQ1 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 LMR14050SSQDDARQ1?
For technical support, including LMR14050SSQDDARQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR14050SSQDDARQ1 requirements.
6.How does Aetrix verify that LMR14050SSQDDARQ1 is sourced from the original manufacturer or authorized distributors?
All LMR14050SSQDDARQ1 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 LMR14050SSQDDARQ1 meets industry standards.
7.What is the process for return or replacement of LMR14050SSQDDARQ1?
All LMR14050SSQDDARQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMR14050SSQDDARQ1, 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 LMR14050SSQDDARQ1 part is unused and in its original packaging.
Return procedure for LMR14050SSQDDARQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMR14050SSQDDARQ1 Tags
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