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Texas Instruments LMS36355QRNLTQ1
- Part No.:
- LMS36355QRNLTQ1
- Manufacturer:
- Texas Instruments
- Package:
- 22-PowerVFQFN
- Datasheet:
-
LMS36355QRNLTQ1.pdf
- Description:
- IC REG BUCK 5V 3.5A 22VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:365
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Product details
Overview
LMS36355QRNLTQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous buck converter delivering 3.5-A output at 5 V, with 400-kHz fixed switching frequency, 94% efficiency at 13.5-V input/5-V/3.5-A output, and integrated compensation for compact power supply design in vehicle ECUs.
For engineers reviewing the LMS36355QRNLTQ1 datasheet, LMS36355QRNLTQ1 pinout, LMS36355QRNLTQ1 application, or LMS36355QRNLTQ1 equivalent, this page delivers verified technical context, validated pin functions, confirmed automotive-grade thermal and EMI performance, and real-world selection guidance for USB charging, driver monitoring, surround-view, and LiDAR subsystems.
Technical Context
The LMS36355QRNLTQ1 implements peak current mode control with seamless PWM-to-PFM transition, enabling high efficiency across 100 µA–3.5-A load range while maintaining ±1.5% reference voltage tolerance and 2.5–5-ms soft-start timing. Its flip-chip VQFN package minimizes switch-node ringing and parasitic inductance.
It features a dedicated open-drain RESET output with 3-ms release timer, internal 3.1-V VCC LDO, bootstrap gate drive (CBOOT), and external frequency synchronization (SYNC) support from 250 kHz to 500 kHz - all operating over –40°C to +125°C ambient with 150°C junction limit.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 3.5 A continuous - supports full-load operation in automotive USB charge and ECU rails without derating at 125°C ambient. |
| Input Voltage Range | 3.5 V to 36 V - enables direct battery connection (including cold-crank 3.5 V) and transient tolerance up to 42 V for ≤500 ms. |
| Fixed Output Voltage | 5.0 V ±1.5% - meets USB 2.0/3.0 power rail accuracy requirements without external feedback resistors. |
| Switching Frequency | 400 kHz ±10% - allows use of compact 2.2-µH inductors and reduces EMI filter size in space-constrained modules. |
| Quiescent Current | 18 µA at 13.5 VIN/5 VOUT/0 A load - extends battery life in always-on vehicle systems like driver monitoring. |
| Efficiency | 94% at 13.5 VIN/5 VOUT/3.5 A - reduces thermal stress and eliminates need for heatsinks in sealed enclosures. |
| RESET Function | Open-drain with 3-ms release timer and 105%/94% VOUT thresholds - replaces discrete supervisor IC in safety-critical subsystems. |
Pinout & Package
Package: 22-pin VQFN (SON), 4.0 mm × 5.0 mm, wettable flanks - enables automated optical inspection (AOI) without x-ray, supporting high-reliability automotive PCB assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VCC) | Internal 3.1-V LDO output | Power source for internal control logic; requires 4.7-µF ceramic capacitor to AGND for stable regulation. |
| 2 (CBOOT) | Bootstrap capacitor node | Drives high-side MOSFET gate; connects via 470-nF capacitor to SW pin for efficient gate charging. |
| 3 (SYNC) | External clock input | Accepts 250–500 kHz system clock (rising-edge triggered); enables synchronized multi-rail power sequencing. |
| 4,14 (PVIN1/PVIN2) | Main power inputs | Parallel-connected VIN paths reduce IR drop and thermal resistance; must tie directly on PCB. |
| 5,10 (PGND1/PGND2) | Power ground terminals | Low-inductance return for internal MOSFETs; must be shorted to AGND and system ground plane. |
| 9 (SW) | Switch node | Connects to power inductor; low ringing due to flip-chip layout enables clean 5-V output in EMI-sensitive camera modules. |
| 15 (AVIN) | Analog input supply | Bias source for internal analog circuits; tied to PVIN on PCB to ensure noise-free reference generation. |
| 16 (FPWM) | Forced PWM mode control | Logic-high disables light-load PFM; ensures constant 400-kHz operation for predictable EMI in radar subsystems. |
| 18 (EN) | Enable input | Active-high with 1.7–2.0 V threshold; supports direct connection to microcontroller GPIO or battery monitor signal. |
| 19 (RESET) | Open-drain status flag | Asserts low during UVLO, thermal shutdown, or EN deactivation; eliminates need for external reset supervisor. |
| 20 (AGND) | Analog ground reference | Reference point for FB, VREF, and RESET; must be star-connected to PGND to minimize noise coupling. |
| 21 (FB) | Feedback input | Monitors regulated 5-V output directly (no divider); enables fast transient response and accurate line/load regulation. |
| 22 (BIAS) | Auxiliary bias input | Connected to output rail to improve light-load efficiency; required for operation below 3.5 V input. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C ambient operation with HBM ±2.5 kV and CDM ±1 kV ESD robustness - meets automotive electronics reliability standards. |
| Integrated compensation | Eliminates external Type-II/III compensation network, reducing BOM count by ≥3 components and simplifying layout for compact ADAS modules. |
| Automatic light-load PFM mode | Reduces IQ to 18 µA at no load while maintaining regulation - critical for always-on vehicle networks with <100-µA sleep budgets. |
| Low EMI switch-node waveform | Flip-chip construction and optimized layout cut dv/dt-induced radiated emissions, easing CISPR 25 Class 5 compliance in infotainment head units. |
| Thermal shutdown with hysteresis | Triggers at 160–185°C junction temperature with 15°C hysteresis - prevents latch-up during sustained overload in enclosed rear-view camera housings. |
Applications
| Automotive USB Charging | Driver Monitoring System |
|---|---|
Use Scenario: Powering dual-port USB 2.0/3.0 hub in center console with battery input (9–16 V) and thermal constraints. IC Role / Device Role / Timing Role: Primary 5-V buck regulator delivering 3.5 A with tight output accuracy and low ripple for USB data integrity. Use Value: 94% efficiency at full load minimizes heat buildup in confined console space; RESET output signals host MCU when output drops below 4.925 V. |
Use Scenario: Supplying image sensor, IR LED driver, and SoC in cabin-facing driver attention module. IC Role / Device Role / Timing Role: Always-on 5-V rail generator with ultra-low 18-µA quiescent current and fast wake-up from EN pin. Use Value: Enables >1-year battery backup life in key-off mode; FPWM mode ensures deterministic EMI profile during video capture. |
| Surround-View ECU | Mechanically Scanning LiDAR |
Use Scenario: Powering four 3.3/5-V camera interfaces and FPGA in 360° parking assist controller. IC Role / Device Role / Timing Role: High-current 5-V source with SYNC input for synchronized switching across multiple rails to suppress beat frequencies. Use Value: 400-kHz fixed frequency enables predictable EMI filtering; wettable-flank VQFN ensures solder joint reliability under vibration. |
Use Scenario: Generating stable 5-V supply for laser diode driver and timing controller in rotating LiDAR head. IC Role / Device Role / Timing Role: Input-transient-tolerant buck converter handling 42-V load-dump spikes without shutdown. Use Value: 36-V max input with 42-V transient rating eliminates need for upstream TVS; RESET flag triggers fault logging before thermal shutdown. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM61480-Q1 | 5-A output, 2.2-MHz switching, smaller 3-mm × 2-mm VQFN - higher frequency enables smaller magnetics but increases EMI filtering complexity. | Preferred for space-constrained ADAS domain controllers needing >3.5-A output; less suitable for legacy 400-kHz EMI-filtered designs. | Select LM61480-Q1 only if board area is critical and EMI filters can be re-optimized for 2.2 MHz. |
| TPS54560-Q1 | 5-A output, 100-kHz–2.5-MHz adjustable frequency, no integrated compensation - requires external loop compensation and more external components. | Better for cost-sensitive non-safety-critical modules where design flexibility outweighs BOM simplicity. | Choose TPS54560-Q1 when frequency tuning or custom loop response is required, accepting added design effort and component count. |
Compared with LM61480-Q1 and TPS54560-Q1, the LMS36355QRNLTQ1 offers optimal balance of automotive qualification, integrated compensation, 400-kHz EMI compatibility, and 3.5-A capability - making it the most direct fit for USB charging and driver monitoring where layout simplicity and proven EMC behavior are prioritized.
Availability
LMS36355QRNLTQ1 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 with AEC-Q100 traceability and long-term production support.
Supply support for LMS36355QRNLTQ1 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 and embedded processing technologies, with deep expertise in automotive power management ICs and functional safety-compliant design.
The LMS3635-Q1 product line targets high-reliability automotive subsystems - including ADAS sensors, infotainment, and body electronics - where wide-input operation, low quiescent current, and AEC-Q100 compliance are mandatory.
FAQ
What is the maximum input voltage rating for LMS36355QRNLTQ1, and how does it handle transients?
LMS36355QRNLTQ1 supports 36-V continuous input with 42-V transient tolerance for ≤500 ms at ≤0.01% duty cycle. This enables direct connection to 12-V automotive batteries while surviving load-dump events without external protection, simplifying front-end design in ECU power stages.
Does LMS36355QRNLTQ1 require external compensation components?
No, LMS36355QRNLTQ1 includes built-in compensation circuitry, eliminating the need for external Type-II or Type-III compensation networks. This reduces component count by ≥3 parts and simplifies PCB layout - especially valuable in space-constrained automotive modules like rear-view cameras.
How does the RESET output function on LMS36355QRNLTQ1, and what are its timing characteristics?
LMS36355QRNLTQ1 provides an open-drain RESET output with internal 3-ms release timer and glitch filtering (24 µs). It asserts low when output falls below 94% of nominal 5 V or during EN deactivation, providing reliable system-level fault signaling without external supervision circuitry.
Can LMS36355QRNLTQ1 operate with input voltages below 3.9 V, and what is the minimum functional input?
Yes - LMS36355QRNLTQ1 supports minimum input of 3.5 V after startup for full functionality at 3.5-A load, enabling operation during cold-crank conditions. Startup requires ≥3.9 V, but once running, it sustains regulation down to 3.5 V, critical for engine-start scenarios in driver monitoring systems.
What package type and thermal performance does LMS36355QRNLTQ1 offer for automotive applications?
LMS36355QRNLTQ1 uses a 22-pin VQFN (SON) package with 4.0 mm × 5.0 mm footprint and wettable flanks. Its RθJA is 29.4°C/W on a thermally optimized 4-layer PCB, enabling 3.5-A operation at 125°C ambient without heatsinks - ideal for sealed automotive enclosures.
LMS36355QRNLTQ1 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)
LMS36355QRNLTQ1 FAQ
1.How can I place an order for LMS36355QRNLTQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMS36355QRNLTQ1 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 LMS36355QRNLTQ1 reliable?
The price and inventory of LMS36355QRNLTQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMS36355QRNLTQ1 is usually 5 days.
3.What payment methods are accepted for LMS36355QRNLTQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMS36355QRNLTQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMS36355QRNLTQ1?
LMS36355QRNLTQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMS36355QRNLTQ1 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 LMS36355QRNLTQ1?
For technical support, including LMS36355QRNLTQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMS36355QRNLTQ1 requirements.
6.How does Aetrix verify that LMS36355QRNLTQ1 is sourced from the original manufacturer or authorized distributors?
All LMS36355QRNLTQ1 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 LMS36355QRNLTQ1 meets industry standards.
7.What is the process for return or replacement of LMS36355QRNLTQ1?
All LMS36355QRNLTQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMS36355QRNLTQ1, 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 LMS36355QRNLTQ1 part is unused and in its original packaging.
Return procedure for LMS36355QRNLTQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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