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Texas Instruments LMS36355QRNLRQ1
- Part No.:
- LMS36355QRNLRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 22-PowerVFQFN
- Datasheet:
-
LMS36355QRNLRQ1.pdf
- Description:
- IC REG BUCK 5V 3.5A 22VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,976
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Product details
Overview
LMS36355QRNLRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous buck converter delivering 5 V at up to 3.5 A, with 400-kHz fixed switching frequency, 94% peak efficiency (13.5 V → 5 V), and integrated RESET output with 3-ms release timer. It operates across 3.9–36 V input, supports external frequency synchronization, and targets power rails in driver monitoring and surround-view ECUs.
For engineers reviewing the LMS36355QRNLRQ1 datasheet, LMS36355QRNLRQ1 pinout, LMS36355QRNLRQ1 application, or LMS36355QRNLRQ1 equivalent, key selection criteria include its 3.5-A continuous output, ±1.5% reference tolerance, 18-µA quiescent current at 5-V output/no load, wettable-flank 22-pin VQFN package, and automotive-grade thermal performance up to +150°C junction temperature.
Technical Context
The LMS36355QRNLRQ1 implements peak current mode control with built-in compensation, enabling stable regulation without external loop components. Its flip-chip VQFN construction minimizes switch-node ringing and EMI, while frequency foldback allows regulation down to 3.5-V input for 5-V output.
It integrates a 3.1-V internal LDO (VCC), bootstrap gate drive (CBOOT), open-drain RESET with internal filtering, and FPWM/automatic light-load mode selection. The device features dual PVIN inputs, dedicated AVIN, and BIAS pin support for high-efficiency operation across wide VIN and load ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output voltage | Fixed 5 V ±1.5% over –40°C to +125°C ambient |
| Max output current | 3.5 A continuous; enables compact 5-V rail for USB charging and camera modules |
| Switching frequency | 400 kHz ±10%; allows use of small 2.2-µH inductors and reduces EMI filter size |
| Input voltage range | 3.9 V to 36 V; withstands 42-V transients ≤500 ms for automotive load-dump robustness |
| IQ at VOUT = 5 V | 18 µA typical (no load); extends battery runtime in always-on vehicle systems |
| Junction temperature | Rated to +150°C; supports placement near heat sources in ECU enclosures |
| Package | 22-pin VQFN (RNL), 4.0 mm × 5.0 mm, wettable flanks for automated optical inspection |
Pinout & Package
Package: 22-pin VQFN (RNL) with 4.0 mm × 5.0 mm body size and wettable flanks; optimized for thermal dissipation (RθJA = 29.4°C/W on 4-layer board) and solder-joint reliability in automotive reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VCC | Internal 3.1-V LDO output | Supplies internal control circuitry; requires 4.7-µF ceramic capacitor to AGND |
| 2 CBOOT | Bootstrap capacitor node | Drives high-side MOSFET gate; connects to SW via 470-nF capacitor |
| 3 SYNC | Frequency synchronization input | Accepts 250–500 kHz external clock; enables system-level EMI reduction |
| 4,14 PVIN1/PVIN2 | Main power inputs | Dual high-current paths; must be shorted together on PCB for low-impedance VIN routing |
| 5,10 PGND1/PGND2 | Power ground terminals | Low-side MOSFET return; tied directly to AGND and system ground plane |
| 9 SW | Switch node | Connects to power inductor; critical for minimizing parasitic inductance and ringing |
| 15 AVIN | Analog supply input | Bias source for error amplifier; connected to PVIN net for noise isolation |
| 16 FPWM | Forced PWM mode control | High = fixed-frequency operation; low = automatic light-load PFM mode |
| 18 EN | Enable input | Active-high logic; 1.7–2.0 V threshold with 0.5 V hysteresis for noise immunity |
| 19 RESET | Open-drain reset flag | Indicates valid output after soft-start; 3-ms release timer prevents false resets |
| 20 AGND | Analog ground reference | Reference for FB, VREF, and internal circuits; must be star-connected to PGND |
| 21 FB | Feedback input | Monitors regulated 5-V output directly; no external divider required for fixed version |
| 22 BIAS | Auxiliary bias regulator input | Connected to output for improved efficiency; enables <18-µA IQ at no load |
Key Features
| Feature | Design Value |
|---|---|
| Integrated RESET with glitch filter | Eliminates need for external supervisor IC; 24-µs internal filter rejects noise-induced faults |
| Automatic light-load PFM mode | Maintains >85% efficiency at 10-mA loads; critical for low-power standby states in ADAS |
| Built-in soft-start | 4-ms ramp time (90% VREF); prevents inrush current and output overshoot during startup |
| Thermal shutdown with hysteresis | Triggers at 160–185°C; 15°C hysteresis ensures safe restart after cooling in engine-bay mounting |
| Low dropout performance | 0.35-V dropout at 3.5-A load; sustains regulation during cold-crank (6-V battery) conditions |
Applications
| Automotive USB Charging | Driver Monitoring System |
|---|---|
|
Use Scenario: Powering dual-lane USB Type-C ports in center console with BC1.2 compliance and thermal derating. IC Role / Device Role / Timing Role: Primary 5-V buck regulator supplying USB PD controller and port power switches. Use Value: 94% efficiency at 3.5-A load minimizes heatsink requirements; 400-kHz switching enables compact 1210-size inductors. |
Use Scenario: Supplying image signal processor (ISP) and CMOS sensor in cabin-facing driver attention camera. IC Role / Device Role / Timing Role: Main 5-V rail generator with tight regulation (±1.5%) for analog front-end stability. Use Value: 18-µA IQ extends battery life during vehicle sleep mode; RESET output validates power integrity before ISP boot. |
| Surround-View ECU | Mechanically Scanning LIDAR |
|
Use Scenario: Powering four 3.3/5-V camera modules and FPGA-based stitching processor in 360° video system. IC Role / Device Role / Timing Role: Secondary 5-V rail for FPGA I/O banks and serializer/deserializer interfaces. Use Value: SYNC input enables phase-aligned switching across multiple LMS36355QRNLRQ1 units to reduce system-level conducted EMI. |
Use Scenario: Generating stable 5-V supply for laser diode driver control logic and photodetector ADC in rotating LIDAR head. IC Role / Device Role / Timing Role: Isolated 5-V source with low noise and fast transient response for precision timing circuits. Use Value: Flip-chip VQFN package reduces switch-node ringing, preserving signal integrity for <100-ps timing resolution. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM61460-Q1 | Higher 6-A rating, 2.1-MHz switching, smaller 12-pin WQFN; lower IQ (15 µA) but no integrated RESET | Suitable for space-constrained designs needing higher current or faster transient response; requires external reset supervisor | Select when board area is critical and 6-A capability is needed; avoid if RESET integration is mandatory for BOM reduction |
| TPS54560-Q1 | 5.5-A rating, adjustable output only, 100-kHz–2.5-MHz programmable frequency; no wettable flanks or integrated RESET | Fits designs requiring wide output adjustability (0.8–36 V) and flexible frequency tuning; lacks automotive-ready RESET function | Choose for non-fixed-output systems where design flexibility outweighs supervisor integration; verify solder inspection method compatibility |
Compared with LM61460-Q1 and TPS54560-Q1, the LMS36355QRNLRQ1 uniquely combines fixed 5-V output, integrated RESET with timer, wettable-flank packaging, and AEC-Q100 Grade 1 qualification-making it optimal for cost-sensitive, safety-aware automotive power rails where component count and production testability are prioritized.
Availability
LMS36355QRNLRQ1 is available at Aetrix Electronics and suitable for automotive USB charging, driver monitoring systems, surround-view ECUs, mechanically scanning LIDAR, and vehicle-to-vehicle communication modules requiring stable component supply across extended temperature and lifecycle demands.
Supply support for LMS36355QRNLRQ1 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 decades of automotive qualification expertise.
The LMS36x5-Q1 product line delivers high-efficiency, low-IQ synchronous buck converters engineered specifically for demanding automotive subsystems-including ADAS, infotainment, and body electronics-where reliability, thermal resilience, and functional safety readiness are essential.
FAQ
What is the maximum continuous output current of the LMS36355QRNLRQ1?
The LMS36355QRNLRQ1 delivers up to 3.5 A continuous output current at 5 V under recommended operating conditions (TA ≤ +125°C, proper PCB thermal layout). This rating is validated per TI's datasheet Section 7.3 and applies to both fixed 5-V and adjustable versions within the LMS3635-Q1 family. Derating is required above +125°C ambient.
Does the LMS36355QRNLRQ1 require external compensation components?
No, the LMS36355QRNLRQ1 includes fully integrated compensation circuitry. Its peak current mode control architecture eliminates the need for external RC networks or type-II/type-III compensators-reducing BOM count and layout sensitivity while maintaining stability across all supported input/output combinations.
How does the RESET output of the LMS36355QRNLRQ1 function?
The LMS36355QRNLRQ1 provides an open-drain RESET output that asserts low during startup until the output reaches 96–110% of nominal 5 V, then releases high after a 2–4 ms internal timer. It includes 24-µs glitch filtering and remains low if EN is deasserted or output drops below threshold-enabling direct connection to microcontroller reset inputs without external supervision.
Can the LMS36355QRNLRQ1 operate with input voltages below 3.9 V?
Yes-the LMS36355QRNLRQ1 supports minimum input voltage of 3.55 V (rising) and 3.25 V (falling) per UVLO thresholds. It can regulate 5 V from as low as 3.5 V input in frequency foldback mode, making it suitable for cold-crank scenarios in 12-V automotive systems where battery voltage dips transiently.
Is the LMS36355QRNLRQ1 pin-compatible with other devices in the LMS36x5-Q1 family?
The LMS36355QRNLRQ1 shares identical 22-pin VQFN (RNL) pinout and footprint with all LMS3635-Q1 and LMS3655-Q1 variants-including LMS36353QRNLRQ1 (3.3 V) and LMS3635AQRNLRQ1 (adjustable). This enables hardware reuse across output voltage options, though current capability (3.5 A vs. 5.5 A) and spread-spectrum enablement differ by part number.
LMS36355QRNLRQ1 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)
LMS36355QRNLRQ1 FAQ
1.How can I place an order for LMS36355QRNLRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMS36355QRNLRQ1 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 LMS36355QRNLRQ1 reliable?
The price and inventory of LMS36355QRNLRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMS36355QRNLRQ1 is usually 5 days.
3.What payment methods are accepted for LMS36355QRNLRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMS36355QRNLRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMS36355QRNLRQ1?
LMS36355QRNLRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMS36355QRNLRQ1 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 LMS36355QRNLRQ1?
For technical support, including LMS36355QRNLRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMS36355QRNLRQ1 requirements.
6.How does Aetrix verify that LMS36355QRNLRQ1 is sourced from the original manufacturer or authorized distributors?
All LMS36355QRNLRQ1 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 LMS36355QRNLRQ1 meets industry standards.
7.What is the process for return or replacement of LMS36355QRNLRQ1?
All LMS36355QRNLRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMS36355QRNLRQ1, 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 LMS36355QRNLRQ1 part is unused and in its original packaging.
Return procedure for LMS36355QRNLRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMS36355QRNLRQ1 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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