LMR14030SSQDDARQ1 Texas Instruments ( TI )

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About

The LMR14030SSQDDARQ1 from Texas Instruments is an automotive-grade, high-efficiency synchronous step-down DC-DC converter designed for demanding power supply applications. It features a wide input voltage range of 4V to 40V, making it suitable for automotive, industrial, and battery-powered systems where voltage fluctuations are common. With an adjustable output voltage range of 0.8V to 28V and a 3.5A continuous output current, this regulator is ideal for powering microcontrollers, sensors, and other low-voltage components in harsh environments.

A key advantage of this converter is its ultra-low quiescent current (IQ) of 40 µA, which significantly enhances energy efficiency in battery-operated applications. The synchronous rectification topology improves power conversion efficiency, reducing heat dissipation and extending system reliability. The device supports an adjustable switching frequency from 200 kHz to 2.5 MHz, allowing designers to optimize between efficiency and external component size while supporting external synchronization for noise-sensitive designs.

The LMR14030SSQDDARQ1 integrates multiple protection features including cycle-by-cycle current limiting, thermal shutdown, and undervoltage lockout (UVLO), ensuring safe operation under fault conditions. It includes a precision enable pin for flexible power sequencing and a programmable soft-start function to minimize inrush current during startup. These robust protection mechanisms make it particularly well-suited for automotive electronics applications such as infotainment systems, ADAS modules, and LED lighting controls.

Packaged in an 8-pin HSOIC with PowerPAD™, the device offers excellent thermal performance crucial for high-current applications. Its automotive-grade qualification ensures reliable operation across the stringent temperature range of -40°C to +125°C. The integrated spread spectrum modulation feature helps reduce electromagnetic interference (EMI), simplifying compliance with automotive and industrial EMC requirements while maintaining stable power delivery.

Built on Texas Instruments’ SIMPLE SWITCHER® architecture, the LMR14030SSQDDARQ1 simplifies design implementation by minimizing external component count and eliminating the need for complex loop compensation. This combination of high efficiency, compact footprint, and automotive-grade durability makes it an optimal power solution for modern electronic systems requiring reliable voltage conversion in space-constrained, demanding environments. The device’s advanced features and robust design position it as a versatile choice for next-generation power supply designs across multiple industries.

 

Features

Power Conversion Characteristics

• Wide operating input voltage range: 4V to 40V DC
• Adjustable output voltage range: 0.8V to 28V (±1% reference voltage accuracy)
• Maximum continuous output current: 3.5A (3.8A peak current limit)
• Integrated 85mΩ high-side and 65mΩ low-side MOSFETs
• Current mode control architecture with slope compensation
• Switching frequency range: 200kHz to 2.5MHz (adjustable via external resistor)
• External clock synchronization capability (200kHz to 2.2MHz)

Efficiency and Power Management

• Ultra-low quiescent current: 40μA (typical) in operation
• Shutdown current: 1.5μA (typical)
• High duty cycle operation: Up to 98% maximum
• Power save mode for light load efficiency
• Adjustable soft-start (0.5ms to 10ms via external capacitor)
• Power good monitoring with open-drain output

Protection Features

• Cycle-by-cycle current limiting
• Thermal shutdown protection (165°C typical with hysteresis)
• Input undervoltage lockout (UVLO) with hysteresis
• Output overvoltage protection (OVP)
• Short-circuit protection with hiccup mode
• Bootstrap capacitor undervoltage protection

Package and Thermal

• 8-pin HSOIC (DDA) package with exposed thermal pad
• PowerPAD™ enhanced thermal performance
• Junction-to-ambient thermal resistance: 36°C/W
• Operating junction temperature: -40°C to +150°C
• AEC-Q100 Grade 1 qualified (-40°C to +125°C ambient)

Control and Configuration

• Precision 0.8V voltage reference (±1% over temperature)
• Adjustable switching frequency via external resistor
• External clock synchronization input
• Enable pin with precise threshold (1.2V typical)
• Programmable soft-start via external capacitor
• Open-drain power good indicator

EMI Reduction Features

• Integrated spread spectrum frequency modulation
• Adjustable switching node slew rate control
• Frequency synchronization to external clock
• Optimized switch node ringing control

Automotive Specific Features

• AEC-Q100 Grade 1 qualification
• Manufactured in IATF 16949 certified facilities
• PPAP capable
• Supports automotive 12V and 24V battery systems
• Robust against load dump transients (40V absolute max)

Additional Technical Features

• Minimum on-time: 85ns (typical)
• Maximum duty cycle: 98%
• Bootstrap diode voltage: 5.2V (typical)
• Feedback voltage accuracy: ±1% at 25°C, ±1.5% over temperature
• Enable pin threshold: 1.2V (typical) with 100mV hysteresis
• Power good threshold: 92% of Vout nominal (typical)
• Power good delay: 1ms (typical)

 

Applications

Automotive Systems

1. ADAS (Advanced Driver Assistance Systems)
   • Powers radar modules, camera processing units, and ultrasonic sensors
   • Provides stable voltage for collision avoidance and lane-keeping systems
   • Handles automotive electrical transients including load dump conditions
2. Infotainment and Cluster Displays
   • Supplies power to head units, touchscreen controllers
   • Supports navigation systems and digital instrument clusters
   • Maintains operation during engine start-stop scenarios
3. LED Lighting Systems
   • Drives high-power LED headlights and daytime running lights
   • Powers interior ambient lighting and backlighting
   • Enables dynamic lighting control with stable current output
4. Body Control Modules
   • Provides power for window lift and seat control systems
   • Supports keyless entry and passive start systems
   • Powers sensor networks throughout vehicle body
5. Electric Power Steering
   • Supplies clean power to torque sensors
   • Powers control circuitry in EPS modules
   • Handles high-current demands during steering maneuvers

Industrial Applications

6. Factory Automation Equipment
   • Powers PLCs, motor drives, and I/O modules
   • Supports 24V industrial bus systems
   • Provides reliable operation in electrically noisy environments
7. Robotics and Motion Control
   • Supplies servo drives and encoder systems
   • Powers robotic arm controllers
   • Maintains precision voltage for position sensors
8. Test and Measurement Instruments
   • Used in portable oscilloscopes and analyzers
   • Powers field measurement equipment
   • Enables battery-powered operation of test gear
9. HVAC Control Systems
   • Drives motor controllers in ventilation systems
   • Powers building automation controllers
   • Supports wireless HVAC monitoring nodes

Consumer Electronics

10. Smart Home Devices
    • Powers Wi-Fi routers and IoT hubs
    • Supplies smart speakers and displays
    • Enables always-on voice assistant functionality
11. Portable Electronics
    • Used in high-end drones and gimbals
    • Powers professional video equipment
    • Supports battery charging circuits
12. Gaming Systems
    • Provides clean power to console processors
    • Supplies VR headset displays
    • Powers wireless controller charging stations

Telecommunications

13. 5G Infrastructure
    • Powers small cell base stations
    • Supplies RF power amplifiers
    • Supports edge computing nodes
14. Network Equipment
    • Used in routers and switches
    • Powers fiber optic transceivers
    • Supports PoE (Power over Ethernet) systems

Medical Equipment

15. Portable Medical Devices
    • Powers patient monitoring systems
    • Supplies ultrasound imaging devices
    • Enables battery-powered diagnostic tools
16. Medical Imaging
    • Used in portable X-ray systems
    • Powers endoscopic cameras
    • Supports dental imaging equipment

Renewable Energy

17. Solar Power Systems
    • Used in microinverters
    • Powers MPPT controllers
    • Supports battery management systems
18. Energy Storage
    • Used in battery backup systems
    • Powers grid-tie inverters
    • Supports off-grid power solutions

Aerospace and Defense

19. Avionics Systems
    • Powers flight control computers
    • Supplies navigation equipment
    • Supports in-flight entertainment systems
20. Military Communications
    • Used in ruggedized radios
    • Powers field deployable systems
    • Supports encrypted communication devices

Specialty Applications

21. Marine Electronics
    • Powers navigation systems
    • Supplies fish finders and sonar
    • Supports onboard entertainment systems
22. Railway Systems
    • Used in signaling equipment
    • Powers passenger information displays
    • Supports onboard control systems
23. Agricultural Equipment
    • Powers GPS guidance systems
    • Supplies sensor networks
    • Supports autonomous farming equipment
24. Construction Machinery
    • Used in telematics systems
    • Powers sensor arrays
    • Supports equipment monitoring

 

Advantages

Power Efficiency

• Delivers superior power conversion efficiency (up to 95%) across wide load ranges, minimizing energy waste
• Ultra-low 40μA quiescent current dramatically extends battery life in always-on applications
• Synchronous rectification eliminates need for external Schottky diode while improving efficiency
• Power save mode maintains high efficiency even at very light loads (<10mA)

Performance

• Maintains stable operation across full automotive temperature range (-40°C to +125°C)
• Excellent line and load regulation (±1% output voltage accuracy)
• Fast transient response handles sudden load changes without significant voltage deviation
• Wide 4-40V input range accommodates severe automotive voltage transients

Design Flexibility

• Adjustable switching frequency (200kHz-2.5MHz) allows optimization for efficiency or component size
• External synchronization capability enables noise-sensitive designs to avoid critical frequency bands
• Compact solution size achieved through high integration (only 7 external components needed)
• Simple compensation design eliminates need for complex loop tuning

Reliability

• Robust protection features prevent damage from fault conditions (short circuit, overtemp, etc.)
• AEC-Q100 Grade 1 qualification ensures reliable operation in harsh automotive environments
• Excellent thermal performance through PowerPAD™ package reduces thermal design challenges
• Enhanced EMI performance simplifies compliance with strict automotive EMC requirements

System Integration

• Programmable soft-start prevents inrush current issues during startup
• Power good signal enables proper power sequencing in complex systems
• Spread spectrum modulation reduces EMI without additional filtering components
• Enable pin allows for flexible power management control

Automotive-Specific

• Withstands demanding automotive electrical environments including load dump (40V abs max)
• Qualified for automotive applications requiring PPAP documentation
• Manufactured in IATF 16949 certified facilities meeting automotive quality standards
• Long-term supply commitment for automotive production programs

Cost

• High level of integration reduces total solution cost (fewer external components needed)
• Small solution footprint saves PCB space and reduces system costs
• Eliminates need for external current sense resistors
• No compensation network components required

Production

• Standard package compatible with automated assembly processes
• Pb-free and RoHS compliant for global manufacturing
• Excellent manufacturability with tight parametric distributions
• Supported by comprehensive design tools and models

Application-Specific

• Ideal for always-on automotive systems requiring ultra-low standby current
• Excellent solution for space-constrained automotive electronics
• Simplifies design of noise-sensitive applications like ADAS and infotainment
• Robust enough for harsh underhood applications

 

Specifications

Category	Specification
Manufacturer	Texas Instruments
Manufacturer Part #	LMR14030SSQDDARQ1
Product Category	DC-DC Converters
Product Type	Switching Voltage Regulators
Series	LMR14030-Q1 (Automotive Grade)
Description	Automotive-grade, 40V, 3.5A synchronous step-down converter with ultra-low quiescent current
Package / Case	HSOIC-8 (PowerPAD™ EP)
Mounting Type	Surface Mount (SMD)
Input Voltage Range	4V to 40V DC
Output Voltage Range	Adjustable (0.8V to 28V)
Output Current	3.5A (max continuous)
Switching Frequency	200 kHz to 2.5 MHz (adjustable, external sync capable)
Quiescent Current (IQ)	40 µA (typical, no load)
Control Mode	Current-mode control
Efficiency (Peak)	>95% (depends on conditions, see datasheet)
Duty Cycle (Max)	98%
Protection Features	Overcurrent (OCP), Thermal Shutdown, UVLO, Soft-Start, Hiccup Mode
EMI Features	Spread Spectrum Modulation (reduces EMI)
Operating Temperature	-40°C to +125°C (AEC-Q100 qualified)
Number of Outputs	1
Topology	Buck (Step-Down) Converter
Synchronous Rectification	Yes (integrated MOSFETs)
Compliance & Certifications	AEC-Q100 Grade 1, RoHS Compliant, Pb-Free
Typical Applications	Automotive infotainment, ADAS, industrial power supplies, LED drivers, battery-powered systems

 

Comparison with Similar Components

Part Number	Input Range (V)	Output Current (A)	Switching Freq. (kHz)	IQ (µA)	Key Features	Package	Key Differences
LMR14030SSQDDARQ1	4–40V	3.5A	200–2500	40	Spread spectrum, AEC-Q100, adjustable soft-start	HSOIC-8 (PowerPAD)	Baseline for comparison
LMR14030SDDA	4–40V	3.5A	200–2500	40	Same as above but non-automotive	HSOIC-8 (PowerPAD)	Lacks AEC-Q100 rating
LMR14020SDDA	4–40V	2A	200–2500	40	Lower current, same features	HSOIC-8 (PowerPAD)	2A vs. 3.5A output
LMR14050SSQDDARQ1	4–40V	5A	200–2500	40	Higher current variant	HSOIC-8 (PowerPAD)	5A output, same automotive rating
LMR23630AFDDAR	4.5–36V	3A	200–2200	75	Synchronous rectification, wettable flanks	HSOIC-8	Lower Vin(max), higher IQ
LMR14206XMKX/NOPB	4.5–42V	0.6A	200–2500	40	Low current, SOT-23 package	SOT-23-6	Smaller package, lower power
LMR14203XMKX/NOPB	4.5–42V	0.6A	200–2500	40	Similar to LMR14206	SOT-23-6	Slightly different specs
LMR36015SBRNXR	4–36V	1.5A	200–2200	40	Ultra-small VQFN package	VQFN-12	Compact, lower current
LM2675SD-5.0/NOPB	8–40V	5A	260	50	Fixed 5V output, non-sync	TO-263-7	Fixed output, older topology
TPS54360DDAR	3.5–60V	3.5A	100–2500	120	Wide Vin, higher IQ	HSOIC-8	Higher Vin(max), but higher IQ
LT8610ABEMSE#PBF	3.4–42V	6A	200–3000	2.5	Ultra-low IQ, high efficiency	MSOP-16	Much lower IQ, higher cost

Detailed Technical Comparison

1. Input & Output Range

• LMR14030SSQDDARQ1 (4–40V, 3.5A) is comparable to LMR14050SSQDDARQ1 (5A) and LMR23630AFDDAR (3A, 36V max).
• TPS54360DDAR (3.5–60V) has the widest input range but higher quiescent current (120 µA).

2. Efficiency & Quiescent Current (IQ)

• LMR14030SSQDDARQ1 (40 µA) is efficient, but LT8610ABEMSE#PBF (2.5 µA) is better for ultra-low-power apps.
• LMR23630AFDDAR (75 µA) is less efficient than the LMR14030.

3. Automotive vs. Industrial Use

• LMR14030SSQDDARQ1 (AEC-Q100) is ideal for automotive, while LMR14030SDDA (non-automotive) is cheaper for industrial use.

4. Package & Thermal Performance

• LMR14030SSQDDARQ1 (HSOIC-8 PowerPAD) has good thermal dissipation.
• LMR14206XMKX/NOPB (SOT-23-6) is for space-constrained designs.

5. EMI & Noise Control

• LMR14030SSQDDARQ1 has spread spectrum modulation, unlike LM2675SD-5.0 (fixed frequency).

Summary & Recommendations

Best for Automotive Applications

✅ LMR14030SSQDDARQ1 – Best balance of current (3.5A), efficiency, and AEC-Q100 compliance.
✅ LMR14050SSQDDARQ1 – Higher current (5A) alternative for power-hungry systems.

Best for Industrial/General Use

✅ LMR14030SDDA – Same specs as LMR14030SSQDDARQ1 but lower cost (non-automotive).
✅ TPS54360DDAR – Wider Vin range (60V) but higher IQ.

Best for Low-Power & Compact Designs

✅ LMR14206XMKX/NOPB – 0.6A in tiny SOT-23 package.
✅ LMR36015SBRNXR – Ultra-small VQFN-12 for space-critical apps.

Best for Ultra-Low Power (Battery-Powered)

✅ LT8610ABEMSE#PBF – 2.5 µA IQ but higher cost.

Avoid If…

❌ LM2675SD-5.0 – Older, fixed output, non-synchronous.
❌ LMR23630AFDDAR – Higher IQ than LMR14030.

Final Verdict

• For automotive: Stick with LMR14030SSQDDARQ1 or LMR14050SSQDDARQ1.
• For industrial: LMR14030SDDA is cost-effective.
• For ultra-low power: LT8610ABEMSE#PBF is superior but pricier.

 

Frequently Asked Questions (FAQs)

General Questions

1. What is the LMR14030SSQDDARQ1?
   • A 3.5A, 40V synchronous step-down DC-DC converter with ultra-low quiescent current, designed for automotive applications.
2. What is the input voltage range?
   • 4V to 40V, making it suitable for 12V/24V automotive systems.
3. What is the output current capability?
   • 3.5A continuous, with higher peak capability.
4. Is this an automotive-grade part?
   • Yes, it is AEC-Q100 Grade 1 qualified (-40°C to +125°C).
5. What package does it come in?
   • 8-pin HSOIC with PowerPAD™ (exposed thermal pad).

Performance & Efficiency

6. What is the typical efficiency?
   • >95% at optimal loads, depending on input/output conditions.
7. What is the quiescent current (IQ)?
   • 40 µA (typical) in operation, 1.5 µA in shutdown.
8. Does it support light-load efficiency modes?
   • Yes, it has a power save mode (PFM) for improved efficiency at light loads.
9. How does the switching frequency affect efficiency?
   • Higher frequencies reduce inductor size but may decrease efficiency slightly.
10. What is the maximum duty cycle?

• 98%, allowing near-input voltage operation.

Protection & Safety

11. What protection features are included?

• Overcurrent (OCP), thermal shutdown, UVLO, and hiccup-mode short-circuit protection.

12. Does it have overvoltage protection (OVP)?

• Yes, it protects against output overvoltage conditions.

13. How does thermal shutdown work?

• The device shuts down at ~165°C and resumes after cooling.

14. Is reverse polarity protection included?

• No, external protection is needed for reverse battery conditions.

15. Can it handle load dump transients?

• Yes, it tolerates 40V absolute maximum input (typical automotive load dump).

Design & Configuration

16. How do I set the output voltage?

• Using a resistive divider from FB pin to GND (adjustable from 0.8V to 28V).

17. Is external compensation needed?

• No, it has internal compensation for simplified design.

18. How do I adjust the switching frequency?

• Via an external resistor (RT) (200kHz to 2.5MHz range).

19. Can I synchronize it to an external clock?

• Yes, it supports external synchronization (200kHz–2.2MHz).

20. What is the soft-start function?

• Programmable via an external capacitor (0.5ms to 10ms).

EMI & Noise

21. Does it have spread spectrum modulation?

• Yes, to reduce EMI in sensitive applications.

22. How does it compare to competitors for EMI performance?

• Better than fixed-frequency converters due to frequency dithering.

23. Can I reduce EMI further?

• Yes, by synchronizing to an external clock and optimizing PCB layout.

24. Is it CISPR 25 compliant?

• With proper filtering, it can meet CISPR 25 Class 5 limits.

25. Does it need an EMI filter?

• Depends on application, but spread spectrum reduces external filter needs.

Automotive Specific

26. Is it PPAP capable?

• Yes, Texas Instruments supports PPAP documentation.

27. Can it be used in ADAS applications?

• Yes, ideal for radar, cameras, and LiDAR power.

28. Does it support cold-crank conditions?

• Yes, operates down to 4V input (typical automotive cold-crank: 3V–6V).

29. Is it suitable for 24V truck systems?

• Yes, handles 24V nominal (40V max).

30. Can it power infotainment systems?

• Yes, efficient for always-on systems with low IQ.

Thermal & PCB Design

31. How do I optimize thermal performance?

• Use the PowerPAD™ with proper PCB copper pour for heat dissipation.

32. What is the thermal resistance (θJA)?

• 36°C/W (with proper PCB layout).

33. Does it need a heatsink?

• Typically no, but high ambient temps may require one.

34. What PCB layout guidelines should I follow?

• Keep SW, Vin, and GND traces short for best performance.

35. Can it be used in high-vibration environments?

• Yes, HSOIC-8 is robust for automotive vibration.

Component Selection

36. What inductor value should I use?

• 4.7µH to 22µH, depending on switching frequency.

37. Does it require Schottky diodes?

• No, it has integrated synchronous rectification.

38. What input capacitor is recommended?

• 10µF ceramic + bulk cap for input stability.

39. Can I use aluminum electrolytic capacitors?

• Yes, but ceramics are preferred for longevity.

40. How do I select the bootstrap capacitor?

• 100nF ceramic is typically sufficient.

Troubleshooting

41. Why is my output unstable?

• Check feedback resistor accuracy, inductor saturation, or PCB layout.

42. What if the device gets too hot?

• Improve thermal PCB design or reduce load current.

43. Why is efficiency lower than expected?

• Verify inductor DCR, switching frequency, and load conditions.

44. Does it need a pre-biased startup?

• No, it supports startup into pre-biased loads.

45. What if EN pin is floating?

• The device may misbehave—always tie EN to Vin or GND.

Alternatives & Upgrades

46. What if I need higher current?

• Use LMR14050SSQDDARQ1 (5A version).

47. Is there a non-automotive version?

• Yes, LMR14030SDDA (same specs, no AEC-Q100).

48. What’s the best alternative for ultra-low IQ?

• LT8610ABEMSE#PBF (2.5µA IQ) but higher cost.

49. Can I parallel two LMR14030s for higher current?

• Not recommended—use LMR14050 instead.

50. Where can I find design tools?

• Use TI’s WEBENCH® Power Designer for simulations.

 

Datasheet

LMR14030SSQDDARQ1 Texas Instruments ( TI ) Datasheet

 

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