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Texas Instruments LMS3635LQRNLRQ1
- Part No.:
- LMS3635LQRNLRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 22-PowerVFQFN
- Datasheet:
-
LMS3635LQRNLRQ1.pdf
- Description:
- IC REG BUCK 5V 3.5A 22VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,115
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Product details
Overview
LMS3635LQRNLRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous buck converter delivering 3.5-A output at fixed 5 V, with 400-kHz ±10% switching frequency, 94% efficiency at 13.5-V input/5-V/3.5-A output, and 18-µA quiescent current (VIN) - used in automotive USB charge and driver monitoring ECUs.
For engineers reviewing the LMS3635LQRNLRQ1 datasheet, LMS3635LQRNLRQ1 pinout, LMS3635LQRNLRQ1 application, or LMS3635LQRNLRQ1 equivalent, key selection factors include its spread-spectrum EMI reduction, open-drain RESET with 3-ms release timer, FPWM mode control, and 3.5-V minimum input capability for cold-crank operation.
Technical Context
The LMS3635LQRNLRQ1 implements peak-current-mode control with integrated compensation, enabling stable regulation across 3.5 V to 36 V input while maintaining 400-kHz fixed-frequency operation. Its flip-chip VQFN package minimizes parasitic inductance, reducing switch-node ringing and conducted EMI.
It features automatic light-load PFM/PWM transition, external SYNC input (250–500 kHz), and a dedicated BIAS pin supporting high-efficiency operation at low output voltages. The device integrates thermal shutdown (160–185°C trip), overcurrent protection (HS/LS limits), and UVLO with hysteresis (3.25–3.55 V rising).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output current | 3.5 A continuous - supports automotive USB ports and camera power rails without derating at +125°C ambient. |
| Input voltage range | 3.5 V to 36 V - sustains operation during cold-crank (3.5 V min) and handles 42-V transients ≤500 ms. |
| Switching frequency | 400 kHz ±10% - enables compact 2.2-µH inductors and reduces EMI filter size vs. lower-frequency converters. |
| Quiescent current | 18 µA at VIN (3.3 VOUT, no load) - extends battery runtime in always-on vehicle modules. |
| Output voltage accuracy | ±1.5% reference tolerance - ensures 4.925–5.08 V output at 3.5-A load, meeting USB 5-V spec tightness. |
| Dropout voltage | 0.35 V at 3.5-A load, 25°C - maintains regulation down to VIN = 5.35 V, critical for low-input headroom designs. |
| RESET delay | 3-ms release timer with internal filtering - eliminates need for external RC timing network in system supervision. |
| Package | VQFN-22 (4.0 mm × 5.0 mm) with wettable flanks - supports automated optical solder-joint inspection per automotive standards. |
Pinout & Package
VQFN-22 (RNL) package, 4.00 mm × 5.00 mm body size, exposed thermal pad, wettable flanks for solder inspection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VCC | Internal LDO output | 3.1-V supply for control circuitry; requires 4.7-µF ceramic capacitor to AGND for stability. |
| 2 CBOOT | Bootstrap capacitor node | Connects 470-nF capacitor to SW; enables high-side MOSFET gate drive above VIN. |
| 3 SYNC | Frequency synchronization input | Rising-edge triggered; accepts 250–500 kHz external clock to align switching with system timing. |
| 4,14 PVIN1/PVIN2 | Main power inputs | Parallel-connected high-current paths; must tie directly together on PCB with local 10-µF input capacitors. |
| 5,10 PGND1/PGND2 | Power ground terminals | Low-inductance return for internal MOSFETs; must be shorted to AGND and thermal pad on PCB. |
| 9 SW | Switch node | Connects to power inductor; high dv/dt node requiring minimized loop area to reduce EMI. |
| 15 AVIN | Analog input supply | Bias source for error amplifier; connect directly to PVIN net for noise immunity. |
| 16 FPWM | Forced PWM mode control | Logic-high forces continuous PWM (no PFM); prevents frequency variation in noise-sensitive systems. |
| 18 EN | Enable input | Active-high; 1.7–2.0 V threshold with 0.5 V hysteresis; supports direct connection to microcontroller GPIO. |
| 19 RESET | Open-drain reset flag | Asserts low during fault or EN=low; includes 24-µs glitch filter and 3-ms release timer - replaces discrete supervisor IC. |
| 20 AGND | Analog ground reference | Star-ground point for FB, VCC, and internal circuits; must be tied to PGND under thermal pad. |
| 21 FB | Feedback input | Monitors regulated 5-V output directly (fixed version); sets output voltage via resistor divider in adjustable variants. |
| 22 BIAS | Auxiliary bias input | Connected to output rail to improve light-load efficiency; required for <3.3-V operation or extended input range. |
Key Features
| Feature | Design Value |
|---|---|
| Spread-spectrum modulation | ±3% frequency dithering reduces peak EMI by >10 dB, easing CISPR 25 Class 5 compliance without added shielding. |
| Integrated RESET generator | True power-good signal with programmable 3-ms release delay and internal filtering - eliminates external RC network and supervisor IC. |
| Low dropout operation | 0.35-V dropout at 3.5-A load enables stable 5-V output from as low as 5.35-V input, supporting start-stop battery profiles. |
| Automotive qualification | AEC-Q100 Grade 1 (–40°C to +125°C ambient), HBM ±2.5 kV, CDM ±1 kV - qualified for under-hood and ADAS ECU deployment. |
| Thermal performance | 29.4°C/W θJA on 4-layer board - supports 3.5-A full-load operation at +125°C ambient with minimal heatsinking. |
| Startup input voltage | 3.5-V minimum operating input after startup - sustains regulation during automotive cold-crank events down to 3.5 V. |
Applications
| Automotive USB Charge | Driver Monitoring System |
|---|---|
Use Scenario: Powering dual-port 5-V USB Type-A outputs in center console or rear-seat modules. IC Role / Device Role / Timing Role: Primary 5-V buck regulator supplying USB PD sink controllers and charging ICs. Use Value: 94% efficiency at 13.5-V/5-V/3.5-A reduces thermal load; spread spectrum meets OEM EMI limits without ferrite beads. |
Use Scenario: Supplying image sensor, ISP, and eye-tracking SoC in cabin-facing driver attention systems. IC Role / Device Role / Timing Role: Main 5-V power rail for low-noise analog front-end and high-speed digital logic. Use Value: Low 18-µA quiescent current extends battery backup time; RESET output synchronizes SoC boot sequence. |
| Surround View ECU | Mechanically Scanning LIDAR |
Use Scenario: Powering four 3.3-V/5-V camera modules and video processor in 360° parking assist systems. IC Role / Device Role / Timing Role: Secondary 5-V rail for camera interface logic and serializer/deserializer ICs. Use Value: 400-kHz fixed frequency avoids beat frequencies with video clock domains; FPWM mode suppresses audible noise. |
Use Scenario: Providing clean 5-V bias for MEMS mirror drivers and laser diode control in long-range scanning LIDAR units. IC Role / Device Role / Timing Role: Precision 5-V supply for analog control loops requiring low ripple and fast transient response. Use Value: 0.35-V dropout enables operation during engine cranking; integrated compensation ensures stability with ceramic output caps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM61480QRNLRQ1 | 5.5-A output, 400-kHz, same VQFN-22 package but no spread spectrum; higher IQ (26 µA) | Higher current capacity suits multi-rail ECUs; lacks EMI reduction feature needed for camera/LIDAR subsystems | Select when >3.5-A load or simpler EMI filtering suffices; verify thermal margin at +125°C ambient |
| TPS543B20RHLT | 3-A, 2-MHz, 3.5-V to 18-V input; uses external compensation; no AEC-Q100 qualification | Targeted at industrial embedded systems; unsuitable for automotive safety-critical zones due to qualification gap | Choose only for non-automotive designs requiring higher switching frequency and design flexibility |
Compared with LM61480QRNLRQ1 and TPS543B20RHLT, the LMS3635LQRNLRQ1 uniquely combines AEC-Q100 Grade 1 qualification, spread-spectrum EMI reduction, and 3.5-V cold-crank support in a production-ready 5-V fixed-output variant - making it optimal for cost-sensitive, EMI-constrained automotive USB and vision ECUs.
Availability
LMS3635LQRNLRQ1 is available at Aetrix Electronics and suitable for automotive USB charge, driver monitoring, surround view ECU, and mechanically scanning LIDAR applications requiring stable component supply, AEC-Q100 compliance, and production-grade traceability.
Supply support for LMS3635LQRNLRQ1 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 leader specializing in analog, embedded processing, and automotive ICs, with decades of automotive qualification expertise and broad power management portfolio.
The LMS3635-Q1 product line delivers high-efficiency, low-EMI synchronous buck regulators optimized for automotive ADAS, infotainment, and body electronics - designed to replace discrete DC/DC solutions with integrated, AEC-Q100-compliant power stages.
FAQ
What is the minimum input voltage required for LMS3635LQRNLRQ1 to maintain regulation?
The LMS3635LQRNLRQ1 supports a minimum input voltage of 3.5 V after startup for full functionality at 3.5-A load, enabling reliable operation during automotive cold-crank conditions. This is achieved via frequency foldback architecture that sustains regulation even when input drops below nominal levels. Below 3.5 V, the device enters undervoltage lockout. The LMS3635LQRNLRQ1 datasheet specifies 3.25–3.55 V rising threshold with 0.3 V hysteresis for robust start-up behavior.
Does LMS3635LQRNLRQ1 require external compensation components?
No, the LMS3635LQRNLRQ1 includes fully integrated compensation circuitry, eliminating the need for external type-II or type-III compensation networks. This simplifies layout, reduces BOM count, and ensures stable operation across all recommended input/output conditions with standard 2.2-µH inductors and ceramic output capacitors. The LMS3635LQRNLRQ1's internal compensation is factory-trimmed and validated over temperature and process variations.
How does the RESET output of LMS3635LQRNLRQ1 function during power-up?
The LMS3635LQRNLRQ1 RESET output asserts low until the output reaches 96% of nominal 5 V and remains stable for 3 ms, then transitions high to indicate valid regulation. It includes built-in 24-µs glitch filtering and a 3-ms release timer, removing the need for external RC timing. During EN assertion, RESET goes high only after soft-start completes and output settles - ensuring precise system-level power sequencing. This behavior is intrinsic to the LMS3635LQRNLRQ1's internal supervisory logic.
Is LMS3635LQRNLRQ1 compatible with external clock synchronization?
Yes, the LMS3635LQRNLRQ1 supports external frequency synchronization via its SYNC pin, accepting a 250–500 kHz square-wave clock with 25–75% duty cycle. Synchronization allows alignment of switching edges across multiple converters to avoid beat frequencies and simplify EMI filter design. The LMS3635LQRNLRQ1 locks to the external clock on rising edges and maintains phase coherence - critical for multi-rail automotive ECUs where noise coupling must be minimized.
What package and thermal characteristics define LMS3635LQRNLRQ1's automotive suitability?
The LMS3635LQRNLRQ1 uses a VQFN-22 (RNL) package with 4.0 mm × 5.0 mm body and wettable flanks, enabling automated optical inspection of solder joints per automotive manufacturing standards. Its thermal resistance is 29.4°C/W (θJA on 4-layer board), allowing full 3.5-A load at +125°C ambient. The LMS3635LQRNLRQ1 also features AEC-Q100 Grade 1 qualification (–40°C to +125°C ambient), HBM ±2.5 kV, and junction temperature rating up to +150°C - confirming robustness for under-hood deployment.
LMS3635LQRNLRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 22-PowerVFQFN
- Packaging:
- Tape & Reel (TR)
- 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):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 3.5A
- 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
- Supplier Device Package:
- 22-VQFN-HR (5x4)
LMS3635LQRNLRQ1 FAQ
1.How can I place an order for LMS3635LQRNLRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMS3635LQRNLRQ1 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 LMS3635LQRNLRQ1 reliable?
The price and inventory of LMS3635LQRNLRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMS3635LQRNLRQ1 is usually 5 days.
3.What payment methods are accepted for LMS3635LQRNLRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMS3635LQRNLRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMS3635LQRNLRQ1?
LMS3635LQRNLRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMS3635LQRNLRQ1 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 LMS3635LQRNLRQ1?
For technical support, including LMS3635LQRNLRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMS3635LQRNLRQ1 requirements.
6.How does Aetrix verify that LMS3635LQRNLRQ1 is sourced from the original manufacturer or authorized distributors?
All LMS3635LQRNLRQ1 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 LMS3635LQRNLRQ1 meets industry standards.
7.What is the process for return or replacement of LMS3635LQRNLRQ1?
All LMS3635LQRNLRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMS3635LQRNLRQ1, 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 LMS3635LQRNLRQ1 part is unused and in its original packaging.
Return procedure for LMS3635LQRNLRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMS3635LQRNLRQ1 Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
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