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LMS3655MQRNLRQ1
Texas Instruments
IC REG BUCK ADJ 5.5A 22VQFN
1663 Pcs New Original In Stock
Buck Switching Regulator IC Positive Adjustable 1V 1 Output 5.5A 22-VFQFN
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*Quantity
Minimum 1
Minimum 1
5.0 / 5.0
- (478 Ratings)
LMS3655MQRNLRQ1
Product Overview
1284496
DiGi Electronics Part Number
LMS3655MQRNLRQ1-DGManufacturer
Texas Instruments
LMS3655MQRNLRQ1
Description
IC REG BUCK ADJ 5.5A 22VQFNInventory
1663 Pcs New Original In Stock
Buck Switching Regulator IC Positive Adjustable 1V 1 Output 5.5A 22-VFQFN
Quantity
Minimum 1
Minimum 1
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LMS3655MQRNLRQ1 Technical Specifications
Category
Power Management (PMIC), Voltage Regulators - DC DC Switching Regulators
Packaging
-
Series
-
Product Status
Active
Function
Step-Down
Output Configuration
Positive
Topology
Buck
Output Type
Adjustable
Number of Outputs
1
Voltage - Input (Min)
3.9V
Voltage - Input (Max)
36V
Voltage - Output (Min/Fixed)
1V
Voltage - Output (Max)
15V
Current - Output
5.5A
Frequency - Switching
250kHz ~ 500kHz
Synchronous Rectifier
No
Operating Temperature
-40°C ~ 125°C (TA)
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
LMS3655
Datasheet & Documents
Manufacturer Product Page
LMS3655MQRNLRQ1 Specifications
HTML Datasheet
LMS3655MQRNLRQ1-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
Standard Package
3,000
Reviews
5.0/5.0-(Show up to 5 Ratings)
de desembre 02, 2025
포장 재질과 설계가 뛰어나 배송 후에도 포장 상태가 거의 변하지 않으며, 매우 만족스럽습니다.
de desembre 02, 2025
Très satisfaite de leur rapport qualité-prix et de leur support après-vente toujours disponible.
de desembre 02, 2025
Le support après-vente est très professionnel et toujours prêt à aider.
de desembre 02, 2025
配達の際の梱包も丁寧で、商品とともに安心感を得られました。
de desembre 02, 2025
The professional support from their team is just as impressive as their product quality—simply top-notch.
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Frequently Asked Questions (FAQ)
Can the LMS3655MQRNLRQ1 safely replace a TPS54620RGYR in a 12V-to-3.3V automotive power supply design without requiring major layout changes?
While both the LMS3655MQRNLRQ1 and TPS54620RGYR are 6A-capable buck regulators, direct replacement is not recommended without evaluation. The LMS3655MQRNLRQ1 operates at a lower switching frequency (250–500 kHz vs. 500 kHz typical for TPS54620) and lacks synchronous rectification, resulting in higher conduction losses and reduced efficiency at light loads. Additionally, its 22-VFQFN package has different thermal and pinout characteristics, requiring PCB layout adjustments—especially for power ground and feedback routing. For automotive 12V→3.3V applications, the LMS3655MQRNLRQ1 may require a larger input/output capacitor bank and improved thermal vias due to lower efficiency. Always validate thermal performance under full load and cold-crank conditions before committing to drop-in replacement.
What are the key reliability risks when using the LMS3655MQRNLRQ1 in an engine control unit (ECU) exposed to -40°C startup and 125°C ambient temperatures?
The LMS3655MQRNLRQ1 is AEC-Q100 qualified and rated for -40°C to 125°C operation, but reliability risks arise from thermal cycling and voltage stress. At -40°C, inductor core materials may exhibit reduced permeability, increasing ripple current and potential saturation risk if not derated. At 125°C, the non-synchronous architecture leads to higher junction temperatures due to diode forward losses, accelerating electromigration in the internal power FET. Mitigate this by ensuring adequate copper area under the 22-VQFN-HR package, using high-Tg PCB material, and selecting inductors rated for 150°C. Also, verify that input transients (e.g., load dump up to 40V) stay within the 36V max rating—consider adding a TVS diode if the system lacks robust front-end protection.
How does the absence of synchronous rectification in the LMS3655MQRNLRQ1 impact efficiency and thermal design in a 5V/4A industrial sensor node powered from 24V?
The LMS3655MQRNLRQ1’s non-synchronous topology uses an internal Schottky diode for freewheeling, which introduces significant conduction losses—especially at high step-down ratios like 24V→5V. At 4A output, diode losses can exceed 1W, reducing peak efficiency to ~85% compared to >92% with a synchronous converter like the LM2675 or TPS54360. This increases junction temperature, demanding careful thermal management: use a 4-layer board with thermal vias under the exposed pad, and ensure ambient airflow or heatsinking if operating above 85°C. For always-on sensor nodes where thermal buildup is cumulative, consider oversizing the inductor and input capacitors to minimize ripple-induced heating, or evaluate a synchronous alternative if long-term reliability is critical.
Is it safe to parallel two LMS3655MQRNLRQ1 devices to achieve 10A output current in a redundant automotive infotainment system?
Paralleling LMS3655MQRNLRQ1 units is not recommended due to lack of current-sharing features and tight tolerances on switching frequency and feedback thresholds. Even minor differences in layout or component values can cause one device to carry disproportionate load, leading to thermal runaway. The non-synchronous design exacerbates imbalance because diode drop varies with temperature. Instead, use a single higher-current regulator like the LM5145-Q1 (10A synchronous buck) or implement active current sharing with external circuitry—which adds complexity and cost. If redundancy is required, design separate power rails with OR-ing diodes rather than paralleling converters, ensuring fault isolation and predictable behavior under single-point failure modes per ISO 26262 guidelines.
What layout considerations are critical when designing with the LMS3655MQRNLRQ1’s 22-VQFN-HR package to avoid switching noise coupling into sensitive analog circuits in a radar module?
The 22-VQFN-HR package of the LMS3655MQRNLRQ1 has an exposed thermal pad that must be grounded, but improper layout can couple high di/dt switching noise (from SW node transitions at 250–500 kHz) into adjacent analog sections. Keep the SW trace as short as possible and avoid routing it near feedback, enable, or analog signal lines. Use a solid ground plane beneath the device but split it carefully—do not allow return currents from the regulator to flow under sensitive RF or ADC sections. Place input capacitors within 5 mm of VIN and GND pins, and use a Kelvin connection for the feedback network to minimize noise pickup. Additionally, the wettable flank feature aids solder inspection but requires precise stencil design; insufficient solder paste can increase thermal resistance and lead to localized hot spots that radiate EMI.
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LMS3655MQRNLRQ1 CAD Models
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