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LM53635NQRNLTQ1
Texas Instruments
IC REG BUCK 3.3V 3.5A 22VQFN
32716 Pcs New Original In Stock
Buck Switching Regulator IC Positive Fixed 3.3V 1 Output 3.5A 22-VFQFN
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*Quantity
Minimum 1
Minimum 1
5.0 / 5.0
- (425 Ratings)
LM53635NQRNLTQ1
Product Overview
1280248
DiGi Electronics Part Number
LM53635NQRNLTQ1-DGManufacturer
Texas Instruments
LM53635NQRNLTQ1
Description
IC REG BUCK 3.3V 3.5A 22VQFNInventory
32716 Pcs New Original In Stock
Buck Switching Regulator IC Positive Fixed 3.3V 1 Output 3.5A 22-VFQFN
Quantity
Minimum 1
Minimum 1
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LM53635NQRNLTQ1 Technical Specifications
Category
Power Management (PMIC), Voltage Regulators - DC DC Switching Regulators
Packaging
Cut Tape (CT) & Digi-Reel®
Series
-
Product Status
Active
Function
Step-Down
Output Configuration
Positive
Topology
Buck
Output Type
Fixed
Number of Outputs
1
Voltage - Input (Min)
3.9V
Voltage - Input (Max)
36V
Voltage - Output (Min/Fixed)
3.3V
Voltage - Output (Max)
-
Current - Output
3.5A
Frequency - Switching
2.1MHz
Synchronous Rectifier
Yes
Operating Temperature
-40°C ~ 150°C (TJ)
Grade
Automotive
Qualification
AEC-Q100
Mounting Type
Surface Mount, Wettable Flank
Package / Case
22-VFQFN
Supplier Device Package
22-VQFN-HR (5x4)
Base Product Number
LM53635
Datasheet & Documents
Manufacturer Product Page
LM53635NQRNLTQ1 Specifications
HTML Datasheet
LM53635NQRNLTQ1-DG
Environmental & Export Classification
RoHS Status
ROHS3 Compliant
Moisture Sensitivity Level (MSL)
2 (1 Year)
REACH Status
REACH Unaffected
ECCN
EAR99
HTSUS
8542.39.0001
Additional Information
Other Names
296-44672-6
296-44672-2
LM53635NQRNLTQ1-DG
296-44672-1
TEXTISLM53635NQRNLTQ1
2156-LM53635NQRNLTQ1
-296-44672-1-DG
Standard Package
250
Reviews
5.0/5.0-(Show up to 5 Ratings)
de desembre 02, 2025
제품 다양성과 가격 투명성 덕분에 신뢰가 생겼고 만족도도 높았습니다.
de desembre 02, 2025
品質優良，使用起來很放心，每次都滿意而歸。
de desembre 02, 2025
Quick delivery and transparent tracking made the process enjoyable.
de desembre 02, 2025
The website’s search function is highly effective, saving me time.
de desembre 02, 2025
Their fast shipping and excellent support exceeded my expectations.
de desembre 02, 2025
I appreciate their dedication to prompt and secure deliveries.
de desembre 02, 2025
Stock availability at DiGi Electronics has been consistently reliable throughout our partnership.
de desembre 02, 2025
Swift delivery and robust products—this combination makes working on complex projects much easier.
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Frequently Asked Questions (FAQ)
What are the key thermal and layout considerations when designing a PCB for the LM53635NQRNLTQ1 in an automotive environment with high ambient temperatures?
The LM53635NQRNLTQ1 operates up to 150°C junction temperature and is AEC-Q100 qualified, but sustained high ambient temperatures (e.g., >105°C) require careful thermal management. Use a 4-layer PCB with a solid ground plane and thermal vias under the 22-VQFN-HR exposed pad to dissipate heat efficiently. Keep input/output capacitors close to minimize loop area and reduce EMI. Avoid placing heat-sensitive components nearby, and consider copper pour on top and bottom layers connected through vias. In engine bay applications, validate thermal performance with infrared imaging under worst-case load and temperature conditions to prevent premature aging or thermal shutdown.
Can the LM53635NQRNLTQ1 safely replace the LM2675-3.3 in a 24V industrial system, and what design changes are needed?
While both are 3.3V fixed-output buck regulators, direct replacement of the LM2675-3.3 with the LM53635NQRNLTQ1 requires significant redesign. The LM53635NQRNLTQ1 supports up to 36V input (vs. 40V for LM2675), so it’s suitable for 24V systems, but its 2.1MHz switching frequency demands smaller external components—use low-ESR ceramic capacitors and a high-frequency inductor (e.g., 1.5µH, 4A+ saturation current). Unlike the LM2675’s asynchronous design, the LM53635NQRNLTQ1 is synchronous, improving efficiency at light loads. Update feedback and compensation networks; the LM53635NQRNLTQ1 has internal feedback, so no external divider is needed. Also, ensure PCB layout follows wettable flank guidelines for reliable solder inspection.
How does the LM53635NQRNLTQ1 handle input voltage transients above 36V, such as load dump events in automotive applications?
The LM53635NQRNLTQ1 has a maximum input voltage rating of 36V, so it cannot survive unprotected load dump transients that can exceed 40V. To protect it, use a TVS diode (e.g., SMAJ33A) rated for 33V clamping voltage and 600W peak pulse power, placed close to the input connector. Add a series input fuse and bulk capacitance (e.g., 10µF ceramic + 100µF electrolytic) to suppress energy during transient events. For full ISO 7637-2 compliance, consider a front-end protection IC like the TPS1H100-Q1. Without this protection, repeated overvoltage exposure will degrade or destroy the LM53635NQRNLTQ1, leading to field failures.
Is the LM53635NQRNLTQ1 a viable drop-in replacement for the TPS54332DDAR in a 12V-to-3.3V, 3A application, and what risks should I evaluate?
The LM53635NQRNLTQ1 can replace the TPS54332DDAR in 12V-to-3.3V applications, but it is not a drop-in due to differences in pinout, package, and control scheme. The TPS54332DDAR uses external compensation and has an enable pin with precise threshold, while the LM53635NQRNLTQ1 has internal compensation and a simpler enable. You must redesign the feedback network and ensure the 2.1MHz switching frequency doesn’t interfere with sensitive analog circuits. Also, the LM53635NQRNLTQ1’s higher switching frequency allows smaller inductors but increases EMI risk—verify conducted emissions per CISPR 25. Finally, confirm that your PCB can accommodate the 22-VQFN-HR wettable flank package, which requires precise stencil and reflow profiling.
What reliability risks should I consider when using the LM53635NQRNLTQ1 in a high-vibration automotive application, and how can I mitigate them?
In high-vibration environments like under-hood automotive systems, the LM53635NQRNLTQ1’s 22-VQFN-HR package is susceptible to solder joint fatigue. The wettable flank design improves visual inspection but doesn’t eliminate mechanical stress. Mitigate risk by using SAC305 or high-reliability solder, applying underfill if necessary, and securing nearby heavy components (e.g., input capacitors) to prevent lever-arm stress. Avoid routing high-current traces across board flex zones. Additionally, ensure the inductor and output capacitors are rated for automotive vibration (e.g., AEC-Q200 qualified). Perform thermal cycling and vibration testing per AEC-Q100 Grade 1 to validate long-term reliability before production.
Quality Assurance (QC)
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LM53635NQRNLTQ1 CAD Models
Texas Instruments LM53635NQRNLTQ1 PCB symbols & footprints
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