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Texas Instruments LMS3635LQRNLTQ1
- Part No.:
- LMS3635LQRNLTQ1
- Manufacturer:
- Texas Instruments
- Package:
- 22-PowerVFQFN
- Datasheet:
-
LMS3635LQRNLTQ1.pdf
- Description:
- IC REG BUCK 5V 3.5A 22VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,000
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Product details
Overview
LMS3635LQRNLTQ1 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 fixed switching frequency, 94% typical efficiency (13.5 V → 5 V, 3.5 A), and integrated RESET output with 3-ms release timer - deployed in vehicle USB charging and surround-view ECU power rails.
For engineers reviewing the LMS3635LQRNLTQ1 datasheet, LMS3635LQRNLTQ1 pinout, LMS3635LQRNLTQ1 application, or LMS3635LQRNLTQ1 equivalent, key selection criteria include its 3.5-A continuous output, 3.5-V minimum input for full functionality, ±1.5% reference tolerance, spread-spectrum EMI reduction, and wettable-flank 4.0 mm × 5.0 mm VQFN package for automated optical inspection.
Technical Context
The LMS3635LQRNLTQ1 implements peak current mode control with internal compensation and seamless PWM/PFM transition, enabling high efficiency across light to full load. Its flip-chip construction minimizes switch-node ringing and radiated EMI, while the integrated 3.1-V VCC LDO powers internal circuitry and supports external bias via the BIAS pin.
It features a dedicated SYNC input (250–500 kHz) for system clock synchronization, FPWM pin for forced PWM mode selection, and a true open-drain RESET output with built-in glitch filtering and voltage threshold hysteresis (±1% of VOUT), eliminating need for external supervisory ICs in automotive domain controllers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 3.5 A continuous - supports automotive infotainment and ADAS sub-systems without external current boosting |
| Input Voltage Range | 3.5 V to 36 V - enables direct battery connection (12 V/24 V systems) with 42-V transient tolerance for surge robustness |
| Fixed Output Voltage | 5 V ±1.5% - meets USB PD and MCU core rail accuracy requirements without external feedback resistors |
| Switching Frequency | 400 kHz ±10% - balances inductor size, efficiency, and EMI in space-constrained automotive PCBs |
| Quiescent Current | 18 µA at VIN = 13.5 V, VOUT = 5 V, no load - extends battery runtime in always-on vehicle modules |
| Thermal Shutdown | 160°C rising threshold with 15°C hysteresis - protects against sustained overload in under-hood environments |
| RESET Output | Open-drain, 3-ms release delay, 105–110% upper / 92–96.5% lower VOUT threshold - provides reliable power-good signaling for SoC boot sequencing |
Pinout & Package
Package: 22-pin VQFN (SON), 4.00 mm × 5.00 mm body size, wettable flanks for solder-joint inspection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Internal 3.1-V LDO output | Supplies internal control logic; requires 4.7-µF capacitor to AGND for stability |
| CBOOT | Bootstrap capacitor node | Drives high-side MOSFET gate; connects to SW via 470-nF ceramic capacitor |
| SYNC | External clock synchronization input | Accepts 250–500 kHz system clock; rising-edge triggered for deterministic phase alignment |
| PVIN1 / PVIN2 | Main power input terminals | Parallel-connected high-current paths; must be shorted on PCB to minimize loop inductance |
| SW | Power switch node | Connects to inductor; low parasitic inductance due to flip-chip layout reduces voltage overshoot |
| PGND1 / PGND2 | Power ground return | Low-impedance paths for high-side/low-side MOSFET currents; tied directly to AGND at single point |
| FPWM | Forced PWM mode control | High = fixed-frequency operation; low = automatic light-load PFM mode; must not float |
| EN | Enable input | Logic-high active; 1.7–2.0 V threshold with 0.5 V hysteresis ensures noise immunity in automotive harnesses |
| RESET | Open-drain power-good flag | Asserts low during fault or EN deactivation; requires external pull-up for system reset coordination |
| FB | Feedback input | Monitors regulated 5-V output directly; no resistor divider needed for fixed-output variant |
| BIAS | Auxiliary bias regulator input | Connected to output rail to reduce quiescent current; enables efficient operation at light loads |
Key Features
| Feature | Design Value |
|---|---|
| Spread-spectrum modulation | ±3% frequency dithering reduces peak conducted EMI by >10 dB, easing CISPR 25 Class 5 compliance |
| Integrated soft-start | 4-ms ramp time prevents inrush current and output overshoot during cold start in automotive environments |
| Low dropout performance | 0.35-V VIN–VOUT differential at 3.5 A ensures regulation down to 5.35 V input for 5-V output |
| Thermal-enhanced packaging | Wettable-flank VQFN with RθJA = 29.4°C/W (4-layer board) enables 3.5-A operation without heatsink in 85°C ambient |
| Automotive qualification | AEC-Q100 Grade 1 (–40°C to +125°C ambient), HBM ±2.5 kV, CDM ±1 kV - validated for under-dash deployment |
Applications
| Automotive USB Charging | Driver Monitoring System |
|---|---|
Use Scenario: Powering dual-port 5-V USB Type-A outputs in center console with battery input (9–16 V). IC Role / Device Role / Timing Role: Primary 5-V buck regulator supplying USB controller, PHY, and port power switches. Use Value: 94% efficiency at 3.5 A eliminates thermal derating; spread spectrum meets OEM EMI limits without shielding. |
Use Scenario: Supplying image signal processor (ISP) and CMOS sensor in cabin-facing driver attention camera. IC Role / Device Role / Timing Role: Stable 5-V rail generator with RESET output synchronized to SoC boot sequence. Use Value: Integrated 3-ms RESET release timer replaces discrete supervisor IC, reducing BOM count and board area by 30%. |
| Surround-View ECU | Mechanically Scanning LIDAR |
Use Scenario: Powering four independent 5-V video decoder channels in 360° camera fusion module. IC Role / Device Role / Timing Role: High-reliability DC/DC stage with thermal shutdown and input UVLO for unregulated battery input. Use Value: 3.5-V minimum operating input enables startup during cranking; wettable flanks ensure solder joint reliability in vibration-prone mounting. |
Use Scenario: Generating 5-V supply for FPGA configuration, motor driver logic, and analog front-end in rotating LIDAR head. IC Role / Device Role / Timing Role: Compact, low-noise power source with SYNC input aligned to system timing master clock. Use Value: 400-kHz fixed frequency allows predictable EMI filtering; FPWM pin enables deterministic timing during laser pulse windows. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM61480QRNXTQ1 | 5.5-A output, 2.5-V min input, 2.1-MHz switching - higher current but narrower VIN range and higher fSW | Better suited for compact 12-V→5-V designs requiring faster transient response; less optimal for 24-V input or low-EMI needs | Select when board space is constrained and 24-V input is not required; verify thermal margin at 5.5 A continuous |
| TPS54560QDGQRQ1 | 5.5-A output, 3.5–60-V input, 100–2500-kHz adjustable fSW - wider VIN but no integrated RESET or spread spectrum | Preferred for industrial 48-V systems or where external supervision is already present; lacks automotive-grade RESET integration | Choose when input exceeds 36 V or when programmable frequency is mandatory; add external supervisor for power-good signaling |
Compared with LM61480QRNXTQ1 and TPS54560QDGQRQ1, the LMS3635LQRNLTQ1 uniquely combines AEC-Q100 Grade 1 qualification, integrated RESET with filtering, spread-spectrum EMI reduction, and wettable-flank packaging - making it the optimal choice for cost-sensitive, EMI-critical automotive 5-V power rails where board-level supervision must be minimized.
Availability
LMS3635LQRNLTQ1 is available at Aetrix Electronics and suitable for automotive USB charging, driver monitoring systems, surround-view ECUs, and mechanically scanning LIDAR requiring stable component supply across extended temperature and long production lifecycles.
Supply support for LMS3635LQRNLTQ1 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 solutions, with over 50 years of innovation in high-reliability electronics.
The LMS3635-Q1 belongs to TI's automotive-qualified synchronous buck converter family, designed specifically for demanding 12-V/24-V vehicle subsystems requiring high efficiency, low EMI, and integrated power-good signaling without external components.
FAQ
What is the minimum input voltage required for LMS3635LQRNLTQ1 to regulate 5 V at full 3.5-A load?
The LMS3635LQRNLTQ1 requires a minimum input voltage of 5.35 V to maintain 5-V output regulation at 3.5-A load, based on its 0.35-V dropout specification. This value accounts for worst-case conditions including temperature, load, and component tolerances. Below this threshold, the device enters dropout mode with reduced switching frequency and potential output deviation beyond ±1.5% tolerance. The 3.5-V absolute minimum input applies only to light-load or no-load conditions.
Does LMS3635LQRNLTQ1 require external compensation components?
No, the LMS3635LQRNLTQ1 includes fully integrated compensation circuitry optimized for standard 5-V output configurations. No external RC networks or compensation capacitors are needed - simplifying design, reducing BOM count, and improving production yield. This internal compensation is factory-trimmed and validated across temperature and process variations, ensuring stable operation with recommended input/output capacitors and inductor values per the datasheet.
How does the RESET output of LMS3635LQRNLTQ1 behave during enable/disable transitions?
The RESET output of LMS3635LQRNLTQ1 asserts low when EN is pulled below 0.4 V (shutdown), and remains low for a guaranteed 2–4 ms after EN rises above threshold before releasing high. It also pulls low during output undervoltage (below 92–96.5% of 5 V) or thermal shutdown. The internal 24-µs glitch filter rejects noise spikes, and the open-drain structure requires an external pull-up resistor to system rail for proper logic-level signaling to microcontrollers or FPGAs.
Can LMS3635LQRNLTQ1 operate with input voltage below 3.5 V?
The LMS3635LQRNLTQ1 supports input voltages as low as 3.5 V only under no-load or very light-load conditions, per its VIN-OPERATE specification. At 3.5 V input, it cannot sustain 5-V output at any significant load due to dropout limitations. For 3.5-A operation, minimum input is 5.35 V. Attempting operation below 3.5 V risks UVLO activation and uncontrolled shutdown; the device is not rated for sub-3.5-V operation in production systems.
Is LMS3635LQRNLTQ1 pin-compatible with other devices in the LMS36x5-Q1 family?
The LMS3635LQRNLTQ1 shares identical 22-pin VQFN (RNL) package, pinout, and footprint with all LMS3635-Q1 and LMS3655-Q1 variants, including LMS36355QRNLTQ1 and LMS3655LQRNLTQ1. However, output current capability (3.5 A vs. 5.5 A), current limit thresholds, and thermal performance differ - so PCB layout and thermal design must match the selected variant's ratings. Electrical compatibility is maintained for drop-in replacement within the same output voltage option.
LMS3635LQRNLTQ1 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)
LMS3635LQRNLTQ1 FAQ
1.How can I place an order for LMS3635LQRNLTQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMS3635LQRNLTQ1 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 LMS3635LQRNLTQ1 reliable?
The price and inventory of LMS3635LQRNLTQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMS3635LQRNLTQ1 is usually 5 days.
3.What payment methods are accepted for LMS3635LQRNLTQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMS3635LQRNLTQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMS3635LQRNLTQ1?
LMS3635LQRNLTQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMS3635LQRNLTQ1 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 LMS3635LQRNLTQ1?
For technical support, including LMS3635LQRNLTQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMS3635LQRNLTQ1 requirements.
6.How does Aetrix verify that LMS3635LQRNLTQ1 is sourced from the original manufacturer or authorized distributors?
All LMS3635LQRNLTQ1 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 LMS3635LQRNLTQ1 meets industry standards.
7.What is the process for return or replacement of LMS3635LQRNLTQ1?
All LMS3635LQRNLTQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMS3635LQRNLTQ1, 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 LMS3635LQRNLTQ1 part is unused and in its original packaging.
Return procedure for LMS3635LQRNLTQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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