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Texas Instruments LMS36353QRNLTQ1
- Part No.:
- LMS36353QRNLTQ1
- Manufacturer:
- Texas Instruments
- Package:
- 22-PowerVFQFN
- Datasheet:
-
LMS36353QRNLTQ1.pdf
- Description:
- IC REG BUCK 3.3V 3.5A 22VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:256
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Product details
Overview
LMS36353QRNLTQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous buck converter delivering 3.3 V at up to 3.5 A from a 3.9–36 V input, featuring 400-kHz fixed switching frequency, 92% typical efficiency at 13.5 VIN/3.3 VOUT/3.5 A, and integrated RESET with 3-ms release timer - deployed in driver monitoring and surround-view ECU power rails.
For engineers reviewing the LMS36353QRNLTQ1 datasheet, LMS36353QRNLTQ1 pinout, LMS36353QRNLTQ1 application, or LMS36353QRNLTQ1 equivalent, key selection criteria include its 3.3-V fixed output, wettable-flank 22-pin VQFN (4.0 mm × 5.0 mm), –40°C to +125°C ambient operation, 18-µA quiescent current at no load, and automotive-grade thermal shutdown at 160°C.
Technical Context
The LMS36353QRNLTQ1 implements peak-current-mode control with internal compensation and seamless PWM/PSM transition, enabling stable regulation across 3.5-A loads while maintaining <±1.5% reference voltage tolerance. Its flip-chip VQFN package minimizes switch-node ringing and conducted EMI via reduced parasitic inductance and partial magnetic field cancellation.
It supports external frequency synchronization (250–500 kHz), pin-selectable forced PWM mode (FPWM pin), and automatic light-load PFM operation. The integrated RESET output provides filtered system-status indication with 105%/94% rising/falling thresholds relative to VOUT, eliminating need for external supervisory ICs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±2% to ±3% regulation over full load and temperature range |
| Max Output Current | 3.5 A continuous; high-side current limit 4.5–7.5 A ensures robust short-circuit protection |
| Input Voltage Range | 3.9 V to 36 V operating; transient tolerant to 42 V ≤ 500 ms enables simplified surge protection |
| Switching Frequency | 400 kHz ±10%; externally synchronizable from 250–500 kHz for EMI reduction |
| IQ at VIN | 18 µA typical at 13.5 VIN, 3.3 VOUT, no load - enables always-on automotive subsystems |
| Duty Cycle Max | 96% normal operation; 98% in dropout - supports low-VIN–VOUT margin applications |
| Thermal Shutdown | 160°C rising threshold with 15°C hysteresis - ensures reliability in under-hood environments |
Pinout & Package
Package: 22-pin VQFN (RNL), 4.00 mm × 5.00 mm body size, wettable flanks for automated optical inspection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Internal 3.1-V LDO output | Power source for internal control circuitry; requires 4.7-µF capacitor to AGND |
| CBOOT | Bootstrap capacitor node | Drives high-side MOSFET gate; connects to SW via 470-nF capacitor |
| SYNC | Frequency sync input | Rising-edge triggered; accepts 250–500 kHz external clock for EMI alignment |
| PVIN1 / PVIN2 | Main power inputs | Parallel-connected VIN pins; require local bypass capacitors and direct PCB tie |
| SW | Switch node | Connects to power inductor; critical for layout-dependent EMI and efficiency |
| PGND1 / PGND2 | Power ground returns | Must be tied together on PCB and connected to AGND/system ground |
| AVIN | Analog supply input | Connected to PVIN; supplies analog circuitry including error amplifier and reference |
| FPWM | Mode control input | High = forced PWM; low = automatic light-load PFM; must not float |
| EN | Enable input | Active-high logic; 1.7–2.0 V threshold with 0.5 V hysteresis; supports wake-up from sleep |
| RESET | Open-drain status flag | Asserts low on fault or EN=low; includes 24-µs glitch filter and 3-ms release timer |
| AGND | Analog ground reference | Reference for FB, VREF, and all electrical specs; must be tied to PGND on PCB |
| FB | Feedback input | Direct connection to 3.3-V output node (no divider required for fixed version) |
| BIAS | Auxiliary bias input | Connected to output; improves light-load efficiency and enables extended VOUT range |
Key Features
| Feature | Design Value |
|---|---|
| Integrated RESET with filtering | Eliminates external supervisor IC; provides true system-status flag with 3-ms release delay |
| Wettable-flank VQFN package | Enables automated optical solder-joint inspection without x-ray, improving automotive manufacturing yield |
| Flip-chip construction | Reduces switch-node parasitic inductance and magnetic field coupling, lowering radiated EMI |
| Low dropout performance | 0.35-V dropout at 3.5 A (25°C) allows operation with minimal input–output differential |
| Automotive qualification | AEC-Q100 Grade 1 (–40°C to +125°C ambient), HBM ±2.5 kV, CDM ±1 kV |
Applications
| Driver Monitoring System | Surround-View ECU |
|---|---|
Use Scenario: Powers image signal processor (ISP) and camera interface logic in real-time driver attention monitoring modules. IC Role / Device Role / Timing Role: Primary 3.3-V power rail regulator with fast transient response and low-noise operation to avoid image artifacts. Use Value: 92% efficiency at 3.5 A reduces thermal load in compact front-end enclosures; RESET output validates ISP readiness before frame capture. | Use Scenario: Supplies 3.3-V logic and sensor interface circuitry in multi-camera surround-view electronic control units. IC Role / Device Role / Timing Role: High-reliability DC/DC converter supporting ASIL-B functional safety requirements via built-in diagnostics (RESET, thermal shutdown). Use Value: Wettable-flank package ensures solder-joint integrity in vibration-prone vehicle chassis mounting; 42-V transient tolerance simplifies front-end protection design. |
| Automotive USB Charging | Mechanically Scanning LIDAR |
Use Scenario: Generates stable 3.3-V auxiliary rail for USB controller, PHY, and charge management ICs in vehicle infotainment USB ports. IC Role / Device Role / Timing Role: Secondary regulated supply decoupled from main 5-V USB rail; operates during engine start-stop cycles. Use Value: 18-µA IQ enables low-power standby mode; 3.9-V minimum input supports battery brownout conditions down to 6 V cranking. | Use Scenario: Powers FPGA configuration logic and timing-critical servo drivers in rotating LIDAR assemblies. IC Role / Device Role / Timing Role: Precision 3.3-V supply with tight output regulation (±2%) and low ripple to maintain FPGA configuration stability. Use Value: Internal compensation and soft-start (2.5–5 ms) prevent inrush-induced voltage sag during motor spin-up sequences. |
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 rated, 2.5-V to 36-V input, 400-kHz fixed freq, but no integrated RESET output | Lacks built-in reset flag; requires external supervisor for system monitoring | Select when higher current headroom is needed and RESET can be implemented externally |
| TPS543B20RSAR | 3.5-A, 4.5–18-V input, 500-kHz programmable freq, PMBus interface, no AEC-Q100 qualification | Not automotive-qualified; adds digital control but increases BOM and layout complexity | Select for non-automotive industrial applications requiring telemetry and dynamic margining |
Compared with LM61480QRNXTQ1 and TPS543B20RSAR, the LMS36353QRNLTQ1 uniquely combines AEC-Q100 Grade 1 compliance, integrated RESET, wettable-flank packaging, and 3.3-V fixed output in a thermally optimized 4×5-mm VQFN - making it optimal for space-constrained, safety-aware automotive subsystems where board area and diagnostic integration are critical.
Availability
LMS36353QRNLTQ1 is available at Aetrix Electronics and suitable for automotive USB charging, driver monitoring systems, and surround-view ECU designs requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for LMS36353QRNLTQ1 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 electronics with decades of automotive qualification expertise.
The LMS3635-Q1 product line delivers high-efficiency, low-IQ synchronous buck converters optimized for demanding automotive environments - specifically targeting ADAS, body electronics, and infotainment subsystems requiring robustness, small footprint, and integrated diagnostics.
FAQ
What is the guaranteed output voltage accuracy of the LMS36353QRNLTQ1 over temperature and load?
The LMS36353QRNLTQ1 delivers 3.3 V output with ±2% to ±3% regulation accuracy across –40°C to +125°C ambient temperature and full 0–3.5-A load range. This is ensured by a ±1.5% internal reference voltage tolerance and system-level validation using recommended external components per the datasheet's typical application circuit.
Does the LMS36353QRNLTQ1 require external compensation components?
No, the LMS36353QRNLTQ1 features fully integrated compensation. Its peak-current-mode architecture with internal transconductance amplifier and Type II compensation network eliminates the need for external RC networks - reducing BOM count and layout sensitivity while maintaining stability across all operating conditions.
How does the RESET output of the LMS36353QRNLTQ1 behave during startup and fault conditions?
The LMS36353QRNLTQ1 RESET output remains low until the output reaches 105% of nominal 3.3 V, then releases high after a 3-ms internal timer. It asserts low again if VOUT falls below 94% of 3.3 V or if EN is pulled low. The open-drain output requires an external pullup resistor and provides glitch-filtered status with 24-µs filtering.
Can the LMS36353QRNLTQ1 operate with input voltages below 3.9 V?
Yes - the LMS36353QRNLTQ1 supports a minimum input voltage of 3.55 V (rising) for full functionality at 3.5-A load, and can regulate down to 3.5 V after startup. Operation below 3.9 V is validated per Section 7.7 of the datasheet, though efficiency and dropout margin decrease as VIN approaches VOUT + 0.35 V.
What thermal performance can be expected from the LMS36353QRNLTQ1 on a standard 4-layer FR4 PCB?
When mounted on a thermally optimized 4-layer FR4 evaluation board (40 mm × 30 mm), the LMS36353QRNLTQ1 achieves a junction-to-ambient thermal resistance (RθJA) of 29.4°C/W and junction-to-board (RθJB) of 5.4°C/W. This enables sustained 3.5-A operation at +85°C ambient with appropriate copper pour and thermal vias under the exposed pad.
LMS36353QRNLTQ1 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):
- 3.3V
- 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)
LMS36353QRNLTQ1 FAQ
1.How can I place an order for LMS36353QRNLTQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMS36353QRNLTQ1 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 LMS36353QRNLTQ1 reliable?
The price and inventory of LMS36353QRNLTQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMS36353QRNLTQ1 is usually 5 days.
3.What payment methods are accepted for LMS36353QRNLTQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMS36353QRNLTQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMS36353QRNLTQ1?
LMS36353QRNLTQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMS36353QRNLTQ1 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 LMS36353QRNLTQ1?
For technical support, including LMS36353QRNLTQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMS36353QRNLTQ1 requirements.
6.How does Aetrix verify that LMS36353QRNLTQ1 is sourced from the original manufacturer or authorized distributors?
All LMS36353QRNLTQ1 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 LMS36353QRNLTQ1 meets industry standards.
7.What is the process for return or replacement of LMS36353QRNLTQ1?
All LMS36353QRNLTQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMS36353QRNLTQ1, 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 LMS36353QRNLTQ1 part is unused and in its original packaging.
Return procedure for LMS36353QRNLTQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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