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Texas Instruments LMS36555QRNLTQ1
- Part No.:
- LMS36555QRNLTQ1
- Manufacturer:
- Texas Instruments
- Package:
- 22-PowerVFQFN
- Datasheet:
-
LMS36555QRNLTQ1.pdf
- Description:
- IC REG BUCK 5V 5.5A 22VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,264
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Product details
Overview
LMS36555QRNLTQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous buck converter delivering up to 5.5 A continuous output current, fixed 5-V output, 400-kHz switching frequency (±10%), and 96% peak efficiency at 12 V → 5 V conversion-used in automotive USB charge systems and surround-view ECU power rails.
For engineers reviewing the LMS36555QRNLTQ1 datasheet, LMS36555QRNLTQ1 pinout, LMS36555QRNLTQ1 application, or LMS36555QRNLTQ1 equivalent, this page delivers verified technical context, validated pin functions, confirmed automotive-grade thermal and EMI performance, and real-world selection guidance for high-reliability 36-V input DC/DC designs.
Technical Context
The LMS36555QRNLTQ1 implements peak current mode control with built-in compensation, enabling stable regulation across 3.9–36 V input while supporting dropout operation down to 3.8 V at full 5.5-A load. Its flip-chip VQFN package minimizes parasitic inductance, reducing switch-node ringing and conducted EMI without external filters.
It integrates a 3.1-V internal LDO (VCC), open-drain RESET with 3-ms release timer and ±3% hysteresis, FPWM/automatic light-load mode selection, and thermal shutdown at 160–185°C. Synchronization input accepts 250–500 kHz external clocks, and BIAS pin enables efficient operation at low input voltages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5 V ±1.5% reference tolerance; ensures stable USB-compliant rail without external feedback divider. |
| Max Output Current | 5.5 A continuous; supports high-power ADAS sensors and multi-camera ECUs without derating at 125°C ambient. |
| Input Voltage Range | 3.9 V to 36 V (transient tolerant to 42 V ≤500 ms); eliminates need for upstream surge protection in 12/24-V automotive systems. |
| Switching Frequency | 400 kHz ±10%; enables compact 2.2-µH inductors and reduces EMI fundamental below AM band. |
| Quiescent Current | 18 µA at 3.3 VOUT, no load; extends battery runtime in always-on vehicle modules. |
| Efficiency | 96% peak at 12 V → 5 V / 3.5 A; minimizes thermal stress in sealed enclosures like camera housings. |
| Junction Temp Range | –40°C to +150°C; qualified for under-hood and radar module placement per AEC-Q100 Grade 1. |
Pinout & Package
Package: 22-pin VQFN (RNL) with wettable flanks, 4.0 mm × 5.0 mm body size, optimized for automated optical inspection and thermal dissipation on 4-layer PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VCC | Internal 3.1-V LDO output | Power source for internal control circuitry; requires 4.7-µF ceramic capacitor to AGND for stability. |
| 2 CBOOT | Bootstrap capacitor node | Drives high-side MOSFET gate; connects via 470-nF capacitor to SW for reliable 100% duty cycle capability. |
| 3 SYNC | External clock sync input | Accepts 250–500 kHz system clock (rising-edge triggered); enables EMI reduction via frequency dithering. |
| 4,14 PVIN1/PVIN2 | Main power inputs | Parallel input pins for low-impedance VIN connection; must be shorted directly on PCB to minimize loop inductance. |
| 5,10 PGND1/PGND2 | Power ground return | Dual low-side MOSFET ground paths; tied together and connected to AGND for optimal thermal and noise performance. |
| 9 SW | Switch node | Connects to power inductor; low parasitic layout critical to suppress ringing and radiated emissions. |
| 15 AVIN | Analog supply input | Bias source for error amplifier and reference; tied to PVIN on PCB for noise immunity. |
| 16 FPWM | Forced PWM mode control | Logic-high forces continuous conduction; prevents audible noise in camera or audio subsystems. |
| 18 EN | Enable input | Active-high; 1.7–2.0 V threshold with 0.5 V hysteresis; supports direct connection to microcontroller GPIO. |
| 19 RESET | Open-drain fault indicator | Asserts low during UVLO, overtemperature, or output fault; includes 24-µs glitch filter and 3-ms release timer. |
| 20 AGND | Analog ground reference | Reference point for FB, VREF, and internal circuits; isolated star-point connection required for accuracy. |
| 21 FB | Feedback input | Internally connected to 5-V reference; no external resistor network needed for fixed-output configuration. |
| 22 BIAS | Auxiliary bias regulator input | Connected to VOUT to improve light-load efficiency; enables regulation down to 3.5 V input at full load. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated compensation | Eliminates external Type-II/III compensation network-reduces BOM count and layout sensitivity. |
| Automatic light-load PFM mode | Maintains >85% efficiency at 10-mA loads, extending battery life in parked-mode vehicle systems. |
| RESET with internal timing | Provides system-ready signal without external supervisor IC-saves 2 mm² board area and cost. |
| Low EMI switch-node waveform | Flip-chip construction and optimized pin layout reduce dv/dt-induced radiation by ≥6 dB vs conventional QFN. |
| Wettable flank package | Enables AOI-based solder joint inspection-critical for zero-defect automotive manufacturing compliance. |
Applications
| Automotive USB Charge | Surround View System ECU |
|---|---|
|
Use Scenario: Powering dual-port 5-V/3-A USB PD modules in center console or rear-seat controllers. IC Role / Device Role / Timing Role: Primary 12-V-to-5-V step-down regulator with tight output regulation and fast transient response to handle dynamic load steps. Use Value: Delivers 5.5-A peak current headroom for simultaneous charging, eliminating brownouts during hot-plug events. |
Use Scenario: Supplying image signal processors and SerDes interfaces in 4-camera surround-view domain controllers. IC Role / Device Role / Timing Role: High-current, low-noise 5-V rail generator with RESET monitoring for safe boot sequencing. Use Value: 96% efficiency at 3.5-A load reduces thermal footprint in space-constrained ECU enclosures. |
| Mechanically Scanning LIDAR | Driver Monitoring System |
|
Use Scenario: Powering motor drivers and FPGA logic in rotating LIDAR assemblies requiring robust 36-V input handling. IC Role / Device Role / Timing Role: Input-transient-tolerant buck converter with 42-V surge rating and thermal shutdown at 185°C. Use Value: Withstands load-dump transients without external TVS, simplifying front-end protection design. |
Use Scenario: Providing clean 5-V supply to infrared illuminators and CMOS image sensors in driver attention monitoring modules. IC Role / Device Role / Timing Role: Low-quiescent-current regulator enabling <20-µA sleep-mode current for always-on sensing. Use Value: 18-µA IQ_VIN extends vehicle battery life during extended parking periods without compromising wake-up latency. |
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 | 6-A output, 2.1-MHz switching, smaller 3-mm × 2-mm VQFN; higher IQ (26 µA) | Better suited for space-constrained infotainment modules needing faster transient response | Select when board area is constrained and 2.1-MHz operation aligns with system EMI requirements |
| TPS54560QDGQRQ1 | 5.5-A output, 100–2500-kHz adjustable frequency, no integrated compensation, larger HTSSOP-16 package | Requires external compensation but offers wider frequency tuning for EMI optimization | Select when design flexibility in loop compensation and frequency sweep testing is prioritized over BOM count |
Compared with LM61480QRNXTQ1 and TPS54560QDGQRQ1, the LMS36555QRNLTQ1 provides superior integration (built-in compensation, RESET, soft-start), lower quiescent current, and automotive-qualified wettable-flank packaging-making it optimal for production-ready, cost-sensitive ADAS power rails where layout simplicity and reliability are critical.
Availability
LMS36555QRNLTQ1 is available at Aetrix Electronics and suitable for automotive USB charge, surround-view ECU, mechanically scanning LIDAR, and driver monitoring system applications requiring stable component supply across extended temperature and lifecycle demands.
Supply support for LMS36555QRNLTQ1 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 automotive qualification experience.
The LMS3655-Q1 product line delivers high-current, low-EMI synchronous buck converters for demanding automotive ADAS and infotainment systems-designed specifically to replace discrete controller-MOSFET solutions with integrated, AEC-Q100-compliant power stages.
FAQ
What is the maximum continuous output current of the LMS36555QRNLTQ1?
The LMS36555QRNLTQ1 delivers 5.5 A continuous output current at ambient temperatures up to +125°C with proper PCB thermal design. This rating is validated per AEC-Q100 Grade 1 conditions and accounts for internal high-side/low-side MOSFET current limits of 6.7–9.5 A and 6–7.5 A respectively.
Does the LMS36555QRNLTQ1 require external compensation components?
No, the LMS36555QRNLTQ1 features built-in compensation circuitry. Its peak current mode architecture with internal Type-II compensation eliminates the need for external RC networks-reducing design complexity and improving stability across input/output voltage and load variations.
How does the RESET function operate on the LMS36555QRNLTQ1?
The LMS36555QRNLTQ1 provides an open-drain RESET output with internal 24-µs glitch filtering and a 3-ms release timer. It asserts low during EN deactivation, output undervoltage (<92% of VOUT), or thermal shutdown, and returns high only after stable regulation is re-established for 3 ms.
What package type and dimensions does the LMS36555QRNLTQ1 use?
The LMS36555QRNLTQ1 uses a 22-pin VQFN (RNL) package measuring 4.0 mm × 5.0 mm with wettable flanks. This package supports automated optical inspection and achieves 29.4°C/W junction-to-ambient thermal resistance on a 4-layer thermally optimized PCB.
Can the LMS36555QRNLTQ1 operate with input voltages below 5 V?
Yes-the LMS36555QRNLTQ1 supports minimum input voltage of 3.8 V at full 5.5-A load when the BIAS pin is connected to VOUT. This enables operation during cold-crank conditions in 12-V automotive systems without external boost circuitry.
LMS36555QRNLTQ1 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:
- 5.5A
- 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)
LMS36555QRNLTQ1 FAQ
1.How can I place an order for LMS36555QRNLTQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMS36555QRNLTQ1 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 LMS36555QRNLTQ1 reliable?
The price and inventory of LMS36555QRNLTQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMS36555QRNLTQ1 is usually 5 days.
3.What payment methods are accepted for LMS36555QRNLTQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMS36555QRNLTQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMS36555QRNLTQ1?
LMS36555QRNLTQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMS36555QRNLTQ1 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 LMS36555QRNLTQ1?
For technical support, including LMS36555QRNLTQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMS36555QRNLTQ1 requirements.
6.How does Aetrix verify that LMS36555QRNLTQ1 is sourced from the original manufacturer or authorized distributors?
All LMS36555QRNLTQ1 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 LMS36555QRNLTQ1 meets industry standards.
7.What is the process for return or replacement of LMS36555QRNLTQ1?
All LMS36555QRNLTQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMS36555QRNLTQ1, 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 LMS36555QRNLTQ1 part is unused and in its original packaging.
Return procedure for LMS36555QRNLTQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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