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Texas Instruments LMS3635MQRNLTQ1
- Part No.:
- LMS3635MQRNLTQ1
- Manufacturer:
- Texas Instruments
- Package:
- 22-PowerVFQFN
- Datasheet:
-
LMS3635MQRNLTQ1.pdf
- Description:
- IC REG BUCK ADJ 3.5A 22VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,889
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Product details
Overview
LMS3635MQRNLTQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous buck converter delivering up to 3.5 A at adjustable output (1 V to 20 V), with 400-kHz fixed switching frequency, 96% peak efficiency (12 V → 5 V), and integrated RESET output with 3-ms release timer - deployed in driver monitoring and surround-view ECU power rails.
For engineers reviewing the LMS3635MQRNLTQ1 datasheet, LMS3635MQRNLTQ1 pinout, LMS3635MQRNLTQ1 application, or LMS3635MQRNLTQ1 equivalent, key selection criteria include its spread-spectrum EMI reduction, 18-µA quiescent current at 3.3 VOUT/no load, –40°C to +125°C ambient operation, and 36-V input with 42-V transient tolerance for robust automotive front-end regulation.
Technical Context
The LMS3635MQRNLTQ1 implements peak-current-mode control with built-in compensation, enabling stable regulation across 3.9–36 V input while supporting seamless PWM/PSM transition. Its flip-chip VQFN package minimizes parasitic inductance, reducing switch-node ringing and conducted EMI without external filters.
It features a dedicated BIAS pin for auxiliary biasing above 15 V output, FPWM mode control for forced continuous conduction, and internal 3.1-V LDO (VCC) powering control circuitry - all operating within a validated –40°C to +150°C junction temperature range per AEC-Q100.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 3.5 A continuous - supports full-load operation in automotive USB charge and LIDAR subsystems |
| Input Voltage Range | 3.9 V to 36 V - accommodates cold-crank (≥3.5 V start-up) and load-dump transients (42 V/500 ms) |
| Switching Frequency | 400 kHz ±10% - enables compact 2.2-µH inductor selection and predictable EMI filtering |
| Quiescent Current | 18 µA at 3.3 VOUT, no load - extends battery runtime in always-on vehicle modules |
| Reference Voltage Accuracy | ±1.5% over temperature - ensures tight output regulation for safety-critical ADAS sensors |
| RESET Output | Open-drain with 3-ms release timer and internal glitch filter - replaces discrete supervisor ICs |
| Thermal Performance | RθJA = 29.4°C/W on 4-layer FR4 - sustains 3.5-A load at +125°C ambient without derating |
Pinout & Package
Package: SON (RNL) 22-pin VQFN, 4.00 mm × 5.00 mm, wettable flanks - supports automated optical solder-joint inspection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Internal 3.1-V LDO output | Supplies internal control logic; requires 4.7-µF ceramic capacitor to AGND |
| CBOOT | Bootstrap capacitor node | Drives high-side MOSFET gate; connects to SW via 470-nF capacitor |
| SYNC | Frequency synchronization input | Accepts 250–500 kHz external clock (rising-edge triggered) for system timing alignment |
| PVIN1 / PVIN2 | Main power input terminals | Parallel-connected VIN pins reduce PCB trace resistance and thermal stress |
| SW | Switch node | Connects to power inductor; low-ringing waveform due to flip-chip layout |
| PGND1 / PGND2 | Power ground return paths | Must be tied together and connected to AGND at single point for noise isolation |
| FPWM | Forced PWM mode control | High = continuous conduction; low = automatic light-load PFM mode |
| EN | Enable input | Active-high; threshold 1.7–2.0 V with 0.5-V hysteresis for noise immunity |
| RESET | Open-drain fault indicator | Asserts low on UVLO, thermal shutdown, or EN deactivation; includes 24-µs glitch filter |
| FB | Feedback input | Monitors output voltage divider; reference = 1.0 V (±0.3%) for adjustable configurations |
| BIAS | Auxiliary bias supply input | Required when VOUT > 15 V; must be grounded or externally powered |
Key Features
| Feature | Design Value |
|---|---|
| Spread-spectrum modulation | ±3% frequency dithering reduces peak EMI by >10 dB, easing CISPR 25 Class 5 compliance |
| Integrated soft-start | 4-ms ramp time prevents inrush current and output overshoot during power-up |
| Low-dropout operation | 0.35-V dropout at 3.5 A (25°C) enables high-efficiency regulation near input rail limits |
| Thermal shutdown protection | 160°C trip with 15°C hysteresis - prevents permanent damage under sustained overload |
| Automotive qualification | AEC-Q100 Grade 1 (–40°C to +125°C ambient), HBM ±2.5 kV, CDM ±1 kV - certified for safety-critical ECUs |
Applications
| Automotive USB Charge | Driver Monitoring System |
|---|---|
Use Scenario: Powering dual-port 5-V USB Type-A outputs in center console with battery backup during engine cranking. IC Role / Device Role / Timing Role: Primary 12-V-to-5-V buck regulator with spread-spectrum EMI control and cold-crank support down to 3.5 V. Use Value: Eliminates need for external EMI filters and backup LDO, reducing BOM count by two components. |
Use Scenario: Supplying image signal processor (ISP) and CMOS camera sensor in cabin-facing driver attention module. IC Role / Device Role / Timing Role: High-efficiency, low-noise 3.3-V power rail with fast transient response to handle burst-mode imaging loads. Use Value: 92% efficiency at 3.3 V/3.5 A and <24-µs RESET glitch filter ensure deterministic sensor initialization. |
| Surround-View ECU | Mechanically Scanning LIDAR |
Use Scenario: Generating stable 5-V and 3.3-V rails for multi-camera fusion controller with CAN FD interface. IC Role / Device Role / Timing Role: Dual-output capable (via separate devices) synchronous buck with synchronized switching to minimize beat-frequency noise. Use Value: SYNC pin enables phase alignment across multiple LMS3635MQRNLTQ1 units, suppressing system-level conducted emissions. |
Use Scenario: Powering laser diode driver and analog front-end in 1550-nm scanning LIDAR unit exposed to under-hood temperatures. IC Role / Device Role / Timing Role: Adjustable 12-V-to-15-V step-up-capable buck (via BIAS pin configuration) with 150°C junction rating. Use Value: Supports extended 1–20 V output range and 150°C junction operation required for high-temperature LIDAR housings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM61480-Q1 | 5.5-A output, 2.1-MHz switching, smaller 3-mm × 2-mm QFN, no spread spectrum | Better suited for space-constrained ADAS domain controllers requiring higher frequency | Select when board area is critical and EMI filtering can be handled externally |
| TPS54560-Q1 | 5.5-A output, 100-kHz–2.5-MHz adjustable frequency, no integrated RESET, higher IQ (43 µA) | Preferred for cost-sensitive body electronics where supervisor ICs are already present | Choose when design already uses discrete reset supervision and needs wider frequency tuning |
Compared with LM61480-Q1 and TPS54560-Q1, the LMS3635MQRNLTQ1 uniquely combines spread-spectrum EMI reduction, integrated RESET with filtering, and wettable-flank VQFN packaging - making it optimal for compact, safety-certified automotive vision systems where board-level noise and component count are critical.
Availability
LMS3635MQRNLTQ1 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 long-term production continuity.
Supply support for LMS3635MQRNLTQ1 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-grade power management ICs, with decades of automotive qualification expertise and ISO/TS 16949 manufacturing certification.
The LMS3635-Q1 product line delivers high-efficiency, low-EMI synchronous buck regulators optimized for demanding automotive ADAS and infotainment subsystems - emphasizing reliability, thermal robustness, and system-level integration.
FAQ
What is the maximum input voltage the LMS3635MQRNLTQ1 can withstand during transients?
The LMS3635MQRNLTQ1 supports up to 42 V on its PVIN pins for ≤500 ms at ≤0.01% duty cycle, enabling robust operation during automotive load-dump events without external TVS clamping. This transient rating is validated per ISO 7637-2 and simplifies front-end protection design in 12-V and 24-V vehicle architectures. The LMS3635MQRNLTQ1 maintains regulation integrity throughout this event without latch-up or parameter shift.
Does the LMS3635MQRNLTQ1 require external compensation components?
No, the LMS3635MQRNLTQ1 features fully integrated compensation - eliminating external RC networks and reducing design risk. Its internal type-II compensator is optimized for standard 2.2-µH inductors and 22-µF output capacitors, enabling stable loop response across –40°C to +125°C. This integration shortens qualification cycles and improves production yield versus open-compensation buck controllers. The LMS3635MQRNLTQ1 achieves <10% output deviation under 1-A/µs load steps.
How does the spread-spectrum feature of the LMS3635MQRNLTQ1 improve EMI performance?
The LMS3635MQRNLTQ1 applies ±3% frequency modulation around its 400-kHz center frequency, spreading energy across a 24-kHz band and reducing peak conducted EMI by >10 dB. This allows compliance with CISPR 25 Class 5 limits using only ferrite beads and small X/Y capacitors - avoiding costly metal shielding or multi-stage LC filters. The LMS3635MQRNLTQ1's spread-spectrum pattern repeats at 1.2 Hz, preventing audible noise in sensitive cabin applications.
Can the LMS3635MQRNLTQ1 operate with an output voltage below 3.3 V?
Yes, the LMS3635MQRNLTQ1 supports adjustable output from 1 V to 20 V via the FB pin and external resistor divider. Its 1.0-V internal reference (±0.3% over temperature) enables precise low-voltage rails such as 1.8-V or 2.5-V for FPGA I/O or SerDes PHYs. Operation below 3.3 V requires verifying inductor DCR and output capacitor ESR to maintain stability and dropout margin - confirmed in TI's SNAS714C datasheet Section 7.7.
What is the purpose of the BIAS pin on the LMS3635MQRNLTQ1?
The BIAS pin supplies the internal bias regulator, improving efficiency and thermal performance when VOUT exceeds 15 V. For outputs >15 V, BIAS must be grounded or driven by an external 3.3-V/5-V source - otherwise, the LMS3635MQRNLTQ1 enters undervoltage lockout. This architecture enables reliable 18-V or 20-V outputs in LIDAR laser drivers while maintaining <18-µA quiescent current. The LMS3635MQRNLTQ1 datasheet specifies max 16-V BIAS pin rating.
LMS3635MQRNLTQ1 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:
- 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:
- 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)
LMS3635MQRNLTQ1 FAQ
1.How can I place an order for LMS3635MQRNLTQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMS3635MQRNLTQ1 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 LMS3635MQRNLTQ1 reliable?
The price and inventory of LMS3635MQRNLTQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMS3635MQRNLTQ1 is usually 5 days.
3.What payment methods are accepted for LMS3635MQRNLTQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMS3635MQRNLTQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMS3635MQRNLTQ1?
LMS3635MQRNLTQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMS3635MQRNLTQ1 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 LMS3635MQRNLTQ1?
For technical support, including LMS3635MQRNLTQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMS3635MQRNLTQ1 requirements.
6.How does Aetrix verify that LMS3635MQRNLTQ1 is sourced from the original manufacturer or authorized distributors?
All LMS3635MQRNLTQ1 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 LMS3635MQRNLTQ1 meets industry standards.
7.What is the process for return or replacement of LMS3635MQRNLTQ1?
All LMS3635MQRNLTQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMS3635MQRNLTQ1, 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 LMS3635MQRNLTQ1 part is unused and in its original packaging.
Return procedure for LMS3635MQRNLTQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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