LM53635NQRNLTQ1 Tech Specifications
Texas Instruments - LM53635NQRNLTQ1 technical specifications, attributes, parameters and parts with similar specifications to Texas Instruments - LM53635NQRNLTQ1

Product Attribute	Attribute Value
Part Number	LM53635NQRNLTQ1
Package	VQFN-22-HR(5x4)
Description	VQFN-22-HR(5x4)
Stock Condition	Get 7120 pcs available quantity at Allelco
Payment	PayPal / TT / Credit Card / Western Union
Allelco Certifications	ESD / ISO 9001 / ISO 13485 / ISO 28000

Product Attribute	Attribute Value
Manufacturer	Texas Instruments
RoHs Status	-
Warranty	100% Perfect Functions
Transport port	Hong Kong
Shipping by	DHL / FedEx / UPS / TNT / SF Express
RFQ Email	info@allelco.com

Parts Introduction

Manufacturer Part Number

LM53635NQRNLTQ1

Manufacturer

Texas Instruments

Introduction

The LM53635NQRNLTQ1 is a high-performance, 3.5A, step-down DC-DC converter that operates from an input voltage range of 3.9V to 36V. It features a fixed 3.3V output, making it an ideal choice for a wide range of applications that require a reliable and efficient power supply.

Product Features and Performance

1MHz Switching Frequency

Synchronous Rectifier for High Efficiency

Automotive-qualified (AEC-Q100)

Wide Operating Temperature Range: -40°C to 150°C

Integrated Power MOSFET Switches

Overcurrent, Overvoltage, and Overtemperature Protection

Product Advantages

High Efficiency and Power Density

Robust Protection Circuitry

Automotive-grade Reliability

Wide Input Voltage Range

Key Reasons to Choose This Product

Exceptional Performance and Reliability

Suitable for Demanding Automotive and Industrial Applications

Easy Integration with Comprehensive Protection Features

Cost-effective Solution for High-power DC-DC Conversion

Quality and Safety Features

AEC-Q100 Qualified

Extensive Protection Circuitry

Rigorous Quality Control and Testing

Compatibility

Compatible with a Wide Range of Power Supply Applications

Application Areas

Automotive Electronics

Industrial Equipment

Heavy-duty Machinery

Telecommunications Infrastructure

Consumer Electronics

Product Lifecycle

The LM53635NQRNLTQ1 is an active product, and our website's sales team continues to support it. There are no immediate plans for discontinuation. However, as technology evolves, there may be newer or alternative models available. Customers are advised to contact our website's sales team for the latest product information and availability.

Frequently Asked Questions(FAQ)

What are the key differences between the LM53635NQRNLTQ1 and a standard non-automotive buck regulator when used in high-reliability automotive applications?: The LM53635NQRNLTQ1 stands out from conventional buck regulators due to its AEC-Q100 qualification, which ensures reliability under extreme thermal, electrical, and mechanical stresses encountered in automotive systems. While most general-purpose regulators operate within consumer-grade temperature ranges (e.g., 0°C to 70°C), this device is rated from -40°C to 150°C junction temperature, enabling operation in harsh environments such as engine bays or transmission control modules. Additionally, its wettable flank package enhances solder joint inspection during manufacturing—critical for safety-critical automotive designs—where visual verification of connections is often required. Unlike typical industrial parts that may only meet basic functional tests, the LM53635NQRNLTQ1 undergoes rigorous process, structural, and environmental stress screening aligned with ISO/TS standards.

How does the switching frequency of 2.1 MHz in the LM53635NQRNLTQ1 impact PCB layout and component selection compared to lower-frequency alternatives?: Operating at 2.1 MHz allows the LM53635NQRNLTQ1 to use significantly smaller inductors and output capacitors than lower-frequency regulators like those running below 500 kHz. For example, a 2.1 MHz design might require a 4.7 µH inductor versus a 22 µH part at 400 kHz—reducing board space by up to 80%. However, higher frequencies increase conduction losses in the MOSFETs and require careful attention to parasitic inductance in traces and vias. The synchronous rectifier architecture helps mitigate efficiency loss at this frequency, achieving over 92% efficiency at full load with a 12 V input. Engineers must still select low-ESR ceramic capacitors (e.g., X7R or C0G types) and ensure ground plane continuity to avoid EMI issues common above 1 MHz.

Can the LM53635NQRNLTQ1 be safely used in battery-powered automotive systems where input voltage drops below 3.9 V?: No, the LM53635NQRNLTQ1 requires a minimum input voltage of 3.9 V to maintain stable regulation at its fixed 3.3 V output. In many automotive applications—such as cold crank conditions or load dump scenarios—the battery voltage can dip below this threshold (e.g., down to 3.0 V during deep discharge). Attempting to operate the regulator outside its specified input range risks uncontrolled behavior, including output droop or latch-up. For systems powered directly from a battery that may fall below 3.9 V, an alternative topology or pre-boost stage would be necessary. Alternatively, if the application uses a capacitor-based holdup circuit or always has auxiliary power available during startup, the LM53635NQRNLTQ1 remains suitable.

How does thermal performance of the LM53635NQRNLTQ1 compare between continuous 3.5 A operation and transient overload conditions?: Under steady-state conditions, the LM53635NQRNLTQ1 dissipates approximately 4.2 W when stepping down from a 12 V input at 3.5 A output (P_loss = (12 – 3.3) × 3.5). With a typical RθJA of 35°C/W on a standard PCB without heatsinking, this results in a junction temperature rise of about 147°C above ambient—making it borderline acceptable only in well-cooled environments or with forced airflow. However, during brief overloads (e.g., 5 A pulses lasting <1 ms), internal current limiting protects the device, but repeated transients can elevate average power dissipation. In contrast, devices with better thermal impedance or integrated thermal shutdown offer more robust protection in compact designs. Always factor in worst-case ambient temperatures (e.g., +85°C in cabin electronics) when sizing heat dissipation paths.

Why might an engineer choose the 22-VQFN-HR package of the LM53635NQRNLTQ1 over larger TO-220 or DPAK packages despite size constraints?: The 22-VQFN-HR (5x4 mm) offers superior thermal and electrical performance in space-constrained automotive modules. Its exposed thermal pad allows direct soldering to a solid ground plane, reducing junction-to-board thermal resistance to as low as 18°C/W—compared to 40–60°C/W for through-hole packages without additional heatsinks. This enables higher sustained output currents without derating. Moreover, the wettable flank feature supports automated optical inspection (AOI), meeting automotive quality requirements where solder joint defects cannot be tolerated. Although hand-soldering is challenging, modern reflow processes easily accommodate this package. For compact ADAS units, infotainment systems, or body control modules, the integration density outweighs the need for larger footprints.

What precautions should be taken when replacing the LM53635NQRNLTQ1 with another buck converter in an existing automotive design?: Direct substitution requires verifying multiple parameters beyond voltage and current ratings. First, confirm the replacement part also meets AEC-Q100 Grade 1 or 2 and operates across the same -40°C to 150°C range. Second, check switching frequency compatibility—using a lower frequency regulator may necessitate larger passives and could affect EMI compliance. Third, validate control loop stability if using adjustable feedback; fixed-output variants like the LM53635 may not allow tuning. Finally, ensure packaging compatibility: the QFN’s fine-pitch leads demand precise stencil printing and alignment. Mismatched components risk reduced efficiency, increased radiated emissions, or failure to pass functional safety audits.

How does the built-in synchronous rectification in the LM53635NQRNLTQ1 improve efficiency compared to asynchronous designs?: Synchronous rectification replaces the diode typically found in asynchronous buck converters with a low-RDS(on) MOSFET, drastically reducing conduction losses during the freewheeling phase. At 3.5 A output, a Schottky diode might exhibit 0.5–0.7 V forward drop, dissipating ~2.1–2.5 W, whereas a modern MOSFET with RDS(on) = 20 mΩ conducts with only 0.07 V drop and 0.245 W loss. This improves overall efficiency by 3–5 percentage points under medium-to-high loads. The LM53635NQRNLTQ1 leverages this advantage at its 2.1 MHz switching frequency, minimizing dead time while maintaining high gate drive strength for the synchronous FET, resulting in consistent gains across light and heavy load conditions.

Is it possible to modify the output voltage of the LM53635NQRNLTQ1, and what are the implications for automotive certification?: The LM53635NQRNLTQ1 features a fixed 3.3 V output and does not support external adjustment via resistors, unlike some programmable regulators. Any attempt to alter the setpoint—such as adding series resistors or using feedback dividers—would compromise the internal compensation network and risk instability or overshoot during transients. Since automotive systems rely on tightly regulated supplies for ECUs and sensors, changing the nominal voltage could violate functional safety requirements (e.g., ISO 26262) or cause downstream IC failures. Therefore, engineers must select the correct fixed-voltage variant from Texas Instruments’ family (e.g., LM53635 for 3.3 V, LM53635M for 5 V) rather than retrofitting the part after design freeze.

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Customer Reviews

Evaluation: 10 Articles

Emil***rperTech

Jun 23, 2026

Works exactly as described. I used it as a USB-to-SPI bridge in a small MCU development project and communication was stable from the first setup.
Liam***terTech

Jun 15, 2026

Used this CPLD in a logic control project. Programming was straightforward and signal timing matched the design requirements.
Nath***rooks

Jun 11, 2026

Installed this power component in a converter board. Output remained stable under different load conditions and thermal performance was better than expected.
Dani***alkerTech

Jun 1, 2026

Product works, but setup took more effort than expected. Once configured the MCU ran reliably, although documentation support felt older compared with newer platforms. Fine for maintenance projects.
Yuki***aka88

May 26, 2026

信号通信プロジェクトでこのRS-485トランシーバーを使用しました。設置は簡単で、長距離ケーブルでも通信は安定していました。消費電力も、以前使用していたものより低くなっています。
Stev***aker

May 20, 2026

Solid diode for power rectification. Works well in switching circuits.
Bran***Lewis

May 11, 2026

Compact FPGA with good performance. Suitable for basic signal processing tasks.
Oliv***arris

May 7, 2026

Reliable I/O expander. Works well in embedded control applications.
Jess***Jones

Apr 17, 2026

It offers good value for the price, and the specifications match the description. I’ve been using it for two days with no issues, and I’ll definitely buy it again if I need it in the future.
Mich***Smith

Apr 17, 2026

Shipping was on time, the component pins are neatly aligned, and I tested 10 of them with a multimeter—all readings were within the specified range. Highly recommended.

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Common Countries Logistic Time Reference
Region	Country	Logistic Time(Day)
America	United States	5
America	Brazil	7
Europe	Germany	5
	United Kingdom	4
	Italy	5
Oceania	Australia	6
Oceania	New Zealand	5
Asia	India	4
Asia	Japan	4
Middle East	Israel	6

DHL & FedEx Shipment Charges Reference
Shipment charges(KG)	Reference DHL(USD$)
0.00kg-1.00kg	USD$30.00 - USD$60.00
1.00kg-2.00kg	USD$40.00 - USD$80.00
2.00kg-3.00kg	USD$50.00 - USD$100.00

Note:: The above table is for reference only. There may have some data bias for the uncontrollable factors.
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