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Texas Instruments LMR14050SQDDAQ1
- Part No.:
- LMR14050SQDDAQ1
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LMR14050SQDDAQ1.pdf
- Description:
- IC REG BUCK ADJ 5A 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:216
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Product details
Overview
LMR14050SQDDAQ1 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–40 V input range, 5 A continuous output current, 40 µA quiescent current in sleep mode, and adjustable 200 kHz–2.5 MHz switching frequency - designed for battery regulation in engine control units and ADAS domain controllers.
For engineers reviewing the LMR14050SQDDAQ1 datasheet, LMR14050SQDDAQ1 pinout, LMR14050SQDDAQ1 application, or LMR14050SQDDAQ1 equivalent, key selection considerations include ultra-low IQ for always-on systems, spread-spectrum EMI reduction, precision enable for power sequencing, thermal shutdown at 170°C, and HSOIC-8 PowerPAD™ package compatibility with industrial and automotive PCB layouts.
Technical Context
The LMR14050SQDDAQ1 implements fixed-frequency peak current mode control with internal loop compensation, enabling stable operation across wide VIN and load ranges without external compensation components. It supports both resistor-programmed (RT/SYNC pin) and external clock synchronization modes, with PLL lock-in time under 100 µs and minimum on-time of 75 ns for high-duty-cycle dropout operation.
Its sleep-mode architecture reduces switching losses at light loads by clamping COMP voltage at 400 mV and disabling the high-side MOSFET, achieving 40 µA IQ while maintaining regulation via periodic burst-mode recovery. The integrated bootstrap circuit enables up to ~97% duty cycle, supported by automatic BOOT capacitor recharge when BOOT–SW falls below 3.2 V.
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 industrial 24 V rails without pre-regulation. |
| Output Current | 5 A continuous - delivers full rated load at 125°C ambient with proper PCB thermal design using HSOIC-8 PowerPAD™. |
| Quiescent Current | 40 µA in sleep mode - extends battery life in always-on vehicle modules such as telematics and body control units. |
| Switching Frequency | 200 kHz to 2.5 MHz - adjustable via RT resistor or external clock; higher frequencies reduce inductor size, lower frequencies improve efficiency. |
| High-Side RDS(on) | 90 mΩ typical - minimizes conduction loss at 5 A, enabling >90% efficiency at 12 VIN/5 VOUT with 300 kHz switching. |
| Feedback Reference | 0.750 V ±1.5% over –40°C to +125°C - enables precise output voltage setting (e.g., 3.3 V, 5 V) with standard 1% resistors. |
| Thermal Shutdown | 170°C with 12°C hysteresis - protects die during overload or poor heatsinking; resumes operation after cooldown. |
Pinout & Package
LMR14050SQDDAQ1 uses the 8-pin HSOIC package with exposed PowerPAD™ thermal pad (4.9 mm × 6 mm), optimized for low thermal resistance (RθJA = 43.2°C/W) in automotive PCBs with 2 oz copper and thermal vias.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOT | Bootstrap supply | Connects 0.1 µF ceramic capacitor to SW; supplies gate drive voltage for high-side MOSFET during ON state. |
| VIN | Main power input | Accepts 4–40 V; requires local high-frequency bypass capacitor (e.g., 10 µF X7R + 100 nF C0G) placed near pin. |
| EN | Enable control | Logic-level input with 1.2 V threshold and internal pull-up; supports system UVLO programming via resistor divider. |
| RT/SYNC | Frequency control | Configures switching frequency via resistor to GND (200 kHz–2.5 MHz) or accepts external clock (250 kHz–2.3 MHz). |
| FB | Voltage feedback | Monitors output via resistor divider; 0.75 V reference sets VOUT = 0.75 × (1 + RFBT/RFBB). |
| SS | Soft-start timing | Connects external capacitor (CSS); 3 µA internal current source controls ramp-up time to limit inrush current. |
| GND | Power ground | System return path; must be connected to PCB ground plane with low-inductance routing. |
| SW | Switch node | Drives external power inductor; high dv/dt node requiring tight layout and minimized trace area to reduce EMI. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C ambient operation, HBM ±2 kV and CDM ±750 V ESD robustness - suitable for under-hood ECUs. |
| Synchronized spread-spectrum mode | Reduces peak EMI by ±6% frequency dithering - meets CISPR 25 Class 5 requirements without added shielding or filters. |
| Internal compensation | Eliminates need for external Type II/III compensation network - simplifies design, reduces BOM count, and improves stability across capacitor ESR variations. |
| Precision enable with UVLO hysteresis | EN pin supports programmable system-level undervoltage lockout (e.g., 9 V turn-on / 8.5 V turn-off) using two external resistors. |
| 97% max duty cycle with BOOT refresh | Enables operation down to VIN – VOUT ≈ 0.3 V at 5 A - critical for cold-crank scenarios where battery dips to 4.5 V while powering 3.3 V logic rails. |
| 1 µA shutdown current | Minimizes battery drain during vehicle sleep mode - extends parasitic draw budget for Body Control Modules and infotainment standby. |
Applications
| Automotive Battery Regulation | Industrial Power Supplies |
|---|---|
Use Scenario: Regulating 12 V battery rail to 3.3 V/5 V for microcontrollers and sensors in engine control units during cold-crank (4.5 V min). IC Role / Device Role / Timing Role: Primary buck regulator providing isolated, low-noise, thermally robust power with AEC-Q100 compliance. Use Value: Maintains 5 A output at 4.5 VIN via 97% duty cycle and BOOT refresh, avoiding brownout during cranking transients. |
Use Scenario: Converting 24 V factory bus to 5 V for PLC I/O modules operating continuously in 60°C cabinet environments. IC Role / Device Role / Timing Role: High-efficiency, thermally managed DC-DC stage with 43.2°C/W RθJA and 170°C thermal shutdown. Use Value: Delivers full 5 A load at 125°C junction temperature using standard 2-layer PCB with thermal vias to inner ground plane. |
| Telecom/Datacom Systems | General Purpose Wide Vin Regulation |
Use Scenario: Point-of-load conversion in 48 V telecom rectifier systems requiring low IQ and EMI control for dense board layouts. IC Role / Device Role / Timing Role: Synchronized buck converter locked to system clock to avoid beat frequencies and meet CISPR 25 radiated emissions limits. Use Value: Spread-spectrum + synchronization reduces 150 kHz–30 MHz peak emissions by >10 dBµV/m vs. fixed-frequency operation. |
Use Scenario: Universal input power stage for test equipment accepting 9–36 V DC inputs and delivering stable 5 V/3.3 V outputs. IC Role / Device Role / Timing Role: Flexible, single-chip solution with adjustable frequency, soft-start, and precision enable for lab-grade power integrity. Use Value: External RT resistor and SS capacitor allow tuning of startup behavior and switching noise profile per application requirement. |
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 4–40 V input, same HSOIC-8 package and pinout - shares all control features including spread spectrum and SYNC. | Lower current rating suits sub-4 A loads like camera modules or gateway MCUs; reduces thermal margin requirement. | Select when full 5 A capability is unnecessary - enables smaller inductors and lower-cost magnetics without layout change. |
| TPS54560QDGQRQ1 | 60 V max input, 5 A output, but 75 µA IQ (vs. 40 µA), no spread spectrum, and 10-pin MSOP-PowerPAD™ package - not pin-compatible. | Better suited for 48 V industrial or commercial EV auxiliary systems where higher VIN tolerance is required over automotive battery range. | Choose only if 60 V input rating is mandatory; expect higher standby power and additional EMI filtering effort due to missing spread spectrum. |
Compared with LMR14030SQDDAQ1, the LMR14050SQDDAQ1 provides 43% higher current headroom in the same footprint; versus TPS54560QDGQRQ1, it offers superior low-IQ performance and integrated EMI reduction at the cost of lower VIN rating - making it optimal for AEC-Q100-compliant 12/24 V automotive designs.
Availability
LMR14050SQDDAQ1 is available at Aetrix Electronics and suitable for automotive battery regulation, industrial power supplies, telecom/datacom systems, and general-purpose wide-Vin regulation requiring stable component supply across extended temperature and lifecycle demands.
Supply support for LMR14050SQDDAQ1 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 LMR14050SQDDAQ1 belongs to TI's SIMPLE SWITCHER® automotive power converter family, engineered specifically for robust, low-EMI, wide-input DC-DC conversion in safety-critical vehicle subsystems.
FAQ
What is the maximum junction temperature and thermal shutdown behavior of the LMR14050SQDDAQ1?
The LMR14050SQDDAQ1 has a thermal shutdown threshold of 170°C with 12°C hysteresis. When junction temperature exceeds 170°C, the device disables switching and holds the SW pin low until temperature drops to ~158°C, then automatically resumes regulation. This protects against sustained overload or inadequate PCB thermal design while maintaining AEC-Q100 Grade 1 operation up to 125°C ambient.
Can the LMR14050SQDDAQ1 operate with input voltage as low as 4.5 V while delivering 5 A output at 3.3 V?
Yes - the LMR14050SQDDAQ1 supports up to ~97% duty cycle via its integrated BOOT refresh circuit. At 4.5 VIN/3.3 VOUT, this enables continuous 5 A operation during automotive cold-crank events. Verified in datasheet Figure 5-9 (dropout curve), it maintains regulation with <2% VOUT deviation at 5 A load and 300 kHz switching.
Does the LMR14050SQDDAQ1 require external compensation components?
No - the LMR14050SQDDAQ1 features fully internal loop compensation, eliminating the need for external Type II or III compensation networks. This reduces design complexity, saves PCB area, and ensures stable operation across varied output capacitor types (including low-ESR ceramics and polymer capacitors) without tuning.
How is spread-spectrum EMI reduction implemented in the LMR14050SQDDAQ1?
The LMR14050SQDDAQ1 implements spread-spectrum modulation by dithering the switching frequency ±6% around the center value set by the RT resistor or SYNC clock. This spreads energy across a wider bandwidth, reducing peak radiated emissions - particularly effective for meeting CISPR 25 Class 5 limits in automotive EMC testing without added ferrites or shielding.
What package and thermal interface requirements apply to the LMR14050SQDDAQ1?
The LMR14050SQDDAQ1 uses the 8-pin HSOIC package with exposed PowerPAD™ thermal pad (4.9 mm × 6 mm). For optimal thermal performance, the pad must be soldered to a solid PCB ground plane with ≥6 thermal vias (0.3 mm diameter, spaced ≤1.2 mm apart) connecting to inner or bottom-layer copper pours - achieving RθJA = 43.2°C/W as specified.
LMR14050SQDDAQ1 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
LMR14050SQDDAQ1 FAQ
1.How can I place an order for LMR14050SQDDAQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR14050SQDDAQ1 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 LMR14050SQDDAQ1 reliable?
The price and inventory of LMR14050SQDDAQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR14050SQDDAQ1 is usually 5 days.
3.What payment methods are accepted for LMR14050SQDDAQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR14050SQDDAQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR14050SQDDAQ1?
LMR14050SQDDAQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR14050SQDDAQ1 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 LMR14050SQDDAQ1?
For technical support, including LMR14050SQDDAQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR14050SQDDAQ1 requirements.
6.How does Aetrix verify that LMR14050SQDDAQ1 is sourced from the original manufacturer or authorized distributors?
All LMR14050SQDDAQ1 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 LMR14050SQDDAQ1 meets industry standards.
7.What is the process for return or replacement of LMR14050SQDDAQ1?
All LMR14050SQDDAQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMR14050SQDDAQ1, 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 LMR14050SQDDAQ1 part is unused and in its original packaging.
Return procedure for LMR14050SQDDAQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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