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Texas Instruments LMR14050SQDDARQ1
- Part No.:
- LMR14050SQDDARQ1
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LMR14050SQDDARQ1.pdf
- Description:
- IC REG BUCK ADJ 5A 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:1,259
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Product details
Overview
LMR14050SQDDARQ1 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 adjustable 200 kHz–2.5 MHz switching frequency - used for battery regulation in engine control units and ADAS power domains.
For engineers reviewing the LMR14050SQDDARQ1 datasheet, LMR14050SQDDARQ1 pinout, LMR14050SQDDARQ1 application, or LMR14050SQDDARQ1 equivalent, key selection considerations include its 8-pin HSOIC PowerPAD™ package, precision enable input with 1.2 V threshold, internal loop compensation, spread-spectrum EMI reduction option, and thermal shutdown at 170°C.
Technical Context
The LMR14050SQDDARQ1 implements fixed-frequency peak current mode control with slope compensation to prevent sub-harmonic oscillation above 50% duty cycle. It operates in sleep mode below 300 mA peak inductor current, reducing IQ to 40 µA while maintaining regulation via COMP voltage clamping at 400 mV.
Its bootstrap circuit enables up to 97% effective duty cycle during dropout, with automatic BOOT capacitor recharge when BOOT–SW falls below 3.2 V. The device supports external synchronization (250 kHz–2.3 MHz) and spread-spectrum dithering (±6%) for EMI mitigation, and integrates overvoltage, overtemperature, and cycle-by-cycle current limit 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) without pre-regulation. |
| Output Current | 5 A continuous - delivers full rated load at 125°C ambient with DDA package and proper PCB thermal design. |
| Quiescent Current | 40 µA in sleep mode - enables >1-year battery standby in always-on vehicle modules (e.g., telematics, gateway ECUs). |
| Switching Frequency | 200 kHz–2.5 MHz (adjustable via RT resistor or external SYNC clock) - allows trade-off between efficiency (low fSW) and size (high fSW). |
| Feedback Reference | 0.750 V ±1.2% (–40°C to +125°C) - sets output voltage accuracy; enables 3.3 V, 5 V, or custom rails with 1% resistors. |
| High-Side RDS(on) | 90 mΩ typical at 12 V VIN - reduces conduction loss and thermal stress in high-current automotive applications. |
| Min. On-Time | 75 ns - supports high VIN-to-VOUT conversion ratios (e.g., 36 V → 3.3 V at 2.5 MHz) without pulse-skipping instability. |
| Thermal Shutdown | 170°C with 12°C hysteresis - protects die during overload or poor heatsinking; resumes operation after cooldown. |
Pinout & Package
LMR14050SQDDARQ1 uses an 8-pin HSOIC (DDA) package with exposed PowerPAD™ thermal pad (4.9 mm × 6 mm), optimized for automotive board space and thermal performance (RθJA = 43.2°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOT | Bootstrap supply | Connects 0.1 µF X7R ceramic capacitor to SW; supplies gate drive for high-side MOSFET. |
| VIN | Main power input | Accepts 4–40 V; requires low-ESR input capacitor placed near pin to minimize high-frequency noise and voltage spikes. |
| EN | Enable control | Precision 1.2 V threshold with internal pull-up; supports system-level UVLO via external resistor divider. |
| RT/SYNC | Frequency programming or sync input | Configures fSW via resistor to GND (200 kHz–2.5 MHz) or accepts external clock (250 kHz–2.3 MHz) for EMI reduction. |
| FB | Output voltage feedback | Senses divided VOUT; internal 0.75 V reference enables accurate regulation across temperature and load. |
| SS | Soft-start timing | Charged by 3 µA internal current source; controls output ramp time to limit inrush into downstream capacitors. |
| GND | Power ground | Reference for all analog and power circuits; must be connected to large PCB ground plane. |
| SW | Switch node | Drives external inductor; high dv/dt node requiring tight layout and minimal trace length 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, CDM ±750 V - meets automotive reliability requirements. |
| Internal compensation | Eliminates need for external compensation network; reduces BOM count and design iteration time for stable loop response. |
| Spread-spectrum modulation | Reduces peak EMI by ±6% frequency dithering - simplifies compliance with CISPR 25 Class 5 radiated emissions limits. |
| Ultra-low shutdown current | 1 µA max at TJ = 25°C - preserves battery charge during vehicle sleep modes (e.g., parking, key-off). |
| Adjustable minimum on-time | 75 ns guaranteed - enables high-ratio buck conversion (e.g., 36 V → 3.3 V @ 2.5 MHz) without losing regulation. |
| Integrated protection suite | Includes cycle-by-cycle current limit, thermal shutdown, output overvoltage protection, and input UVLO - reduces need for external fault management circuitry. |
Applications
| Automotive Battery Regulation | Industrial Power Supplies |
|---|---|
Use Scenario: Primary 12 V battery rail conditioning in engine control units (ECUs) and body control modules (BCMs), operating through cold-crank (4.5 V) and load-dump (40 V) transients. IC Role / Device Role: Synchronous buck regulator delivering stable 5 V or 3.3 V to microcontrollers, CAN transceivers, and sensors. Use Value: 40 µA sleep-mode IQ extends battery life during vehicle off-state; 90 mΩ RDS(on) minimizes heat generation under continuous 5 A load. | Use Scenario: Wide-input industrial PLC I/O power supply handling 24 V DC factory bus with ±15% tolerance and transient surges. IC Role / Device Role: Main DC-DC stage converting unregulated 18–36 V input to isolated 5 V logic rail for FPGA and communication interfaces. Use Value: Adjustable 200 kHz–2.5 MHz fSW allows optimization for efficiency (200 kHz) or compactness (2.5 MHz); internal compensation accelerates design validation. |
| Telecom and Datacom Systems | General Purpose Wide Vin Regulation |
Use Scenario: Intermediate 12 V rail generation in 48 V telecom rectifier systems, supporting PoE controllers and Ethernet PHYs. IC Role / Device Role: High-efficiency step-down converter feeding secondary isolated DC-DC stages with precise enable sequencing. Use Value: Precision EN input (1.2 V threshold, 3.6 µA hysteresis current) enables reliable power-up/down sequencing with external logic; PGOOD flag confirms regulation before downstream activation. | Use Scenario: Universal input power module for test equipment accepting 9–36 V DC inputs, powering mixed-signal ADCs and digital logic. IC Role / Device Role: Single-chip buck solution replacing discrete controller + MOSFET designs to reduce footprint and improve thermal margin. Use Value: 97% max duty cycle supports low-dropout operation (e.g., 5.5 V → 5 V); 8-pin HSOIC PowerPAD™ simplifies thermal design versus QFN alternatives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR14030SQDDARQ1 | 3.5 A output current, same 4–40 V input, identical pinout and package (DDA), 100 mΩ RDS(on) | Lower current capability; suitable where peak load ≤3.5 A and thermal budget is tighter | Select when full 5 A is not required - reduces cost and improves light-load efficiency due to lower gate charge. |
| LM61480QRNRRQ1 | 8 A output, 3–36 V input, 12-pin WQFN, 30 mΩ RDS(on), 15 µA IQ, supports FPWM mode | Higher current, lower RDS(on), smaller package (4 mm × 4 mm), no spread spectrum | Choose for higher-power ADAS cameras or radar modules needing >5 A; requires layout revision due to different pinout and thermal pad. |
Compared with LMR14030SQDDARQ1, the LMR14050SQDDARQ1 delivers 43% more current in the same footprint but draws slightly higher quiescent current; versus LM61480QRNRRQ1, it trades peak current and size for proven spread-spectrum EMI control and simpler thermal management in HSOIC.
Availability
LMR14050SQDDARQ1 is available at Aetrix Electronics and suitable for automotive battery regulation, industrial PLC power supplies, telecom intermediate rails, and general-purpose wide-Vin embedded systems requiring stable component supply across long product lifecycles.
Supply support for LMR14050SQDDARQ1 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, specializing in analog, embedded processing, and power management ICs for automotive, industrial, and communications markets.
The LMR14050SQDDARQ1 belongs to TI's SIMPLE SWITCHER® automotive power converter family, designed specifically for robust, low-EMI, high-reliability DC-DC conversion in safety-critical vehicle subsystems.
FAQ
What is the maximum junction temperature specification for the LMR14050SQDDARQ1?
The LMR14050SQDDARQ1 has a maximum junction temperature of 150°C under absolute maximum ratings, with thermal shutdown activated at 170°C and 12°C hysteresis. Its recommended operating junction temperature range is –40°C to +125°C, consistent with AEC-Q100 Grade 1 qualification for automotive under-hood environments.
Does the LMR14050SQDDARQ1 support external frequency synchronization?
Yes, the LMR14050SQDDARQ1 supports external frequency synchronization via the RT/SYNC pin, accepting clock signals from 250 kHz to 2.3 MHz. When the pin voltage exceeds the PLL upper threshold (~1.7 V), the internal oscillator disables and the pin becomes a high-impedance clock input synchronized on falling edges - enabling EMI reduction in noise-sensitive automotive systems.
What is the purpose of the SS pin on the LMR14050SQDDARQ1?
The SS (soft-start) pin on the LMR14050SQDDARQ1 controls output voltage ramp-up time using an external capacitor. An internal 3 µA current source charges the capacitor to generate a linear voltage ramp, delaying full regulation to limit inrush current into output capacitors and prevent input voltage droop during startup - critical for protecting upstream power sources in automotive battery systems.
Can the LMR14050SQDDARQ1 operate with input voltages below 4 V?
No, the LMR14050SQDDARQ1 has a specified minimum input voltage of 4 V per its recommended operating conditions. Below this, the device may fail to start or regulate properly due to insufficient gate drive voltage for the internal high-side MOSFET; the undervoltage lockout (UVLO) rising threshold is 3.7 V typical, with 285 mV hysteresis, ensuring reliable disable below 3.42 V.
How does the LMR14050SQDDARQ1 achieve ultra-low quiescent current?
The LMR14050SQDDARQ1 achieves 40 µA quiescent current in sleep mode by disabling switching activity when load current drops below ~300 mA peak, clamping the internal COMP voltage at 400 mV and halting high-side MOSFET gate drive - while maintaining feedback loop monitoring. In shutdown mode (EN < 1.2 V), it draws only 1 µA, achieved via deep bias current reduction in all internal circuit blocks.
LMR14050SQDDARQ1 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
LMR14050SQDDARQ1 FAQ
1.How can I place an order for LMR14050SQDDARQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR14050SQDDARQ1 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 LMR14050SQDDARQ1 reliable?
The price and inventory of LMR14050SQDDARQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR14050SQDDARQ1 is usually 5 days.
3.What payment methods are accepted for LMR14050SQDDARQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR14050SQDDARQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR14050SQDDARQ1?
LMR14050SQDDARQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR14050SQDDARQ1 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 LMR14050SQDDARQ1?
For technical support, including LMR14050SQDDARQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR14050SQDDARQ1 requirements.
6.How does Aetrix verify that LMR14050SQDDARQ1 is sourced from the original manufacturer or authorized distributors?
All LMR14050SQDDARQ1 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 LMR14050SQDDARQ1 meets industry standards.
7.What is the process for return or replacement of LMR14050SQDDARQ1?
All LMR14050SQDDARQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMR14050SQDDARQ1, 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 LMR14050SQDDARQ1 part is unused and in its original packaging.
Return procedure for LMR14050SQDDARQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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