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Texas Instruments LMS36555QRNLRQ1
- Part No.:
- LMS36555QRNLRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 22-PowerVFQFN
- Datasheet:
-
LMS36555QRNLRQ1.pdf
- Description:
- IC REG BUCK 5V 5.5A 22VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,592
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Product details
Overview
LMS36555QRNLRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous buck converter delivering 5.5-A continuous output at 5 V with 400-kHz fixed switching frequency, 96% peak efficiency (12 V → 5 V), and 3.5-V minimum input operation. It integrates high-side/low-side MOSFETs, internal compensation, soft-start, thermal shutdown, and a filtered open-drain RESET output - deployed in vehicle USB charging and surround-view ECU power rails.
For engineers reviewing the LMS36555QRNLRQ1 datasheet, LMS36555QRNLRQ1 pinout, LMS36555QRNLRQ1 application, or LMS36555QRNLRQ1 equivalent, key selection criteria include its 36-V max input with 42-V transient tolerance, ±1.5% reference voltage accuracy, 18-µA quiescent current at 3.3 VOUT/no load, and support for external frequency synchronization between 250 kHz and 500 kHz.
Technical Context
The LMS36555QRNLRQ1 employs peak current mode control with integrated gate drivers and a flip-chip VQFN package to minimize parasitic inductance and switch-node ringing. Its frequency foldback architecture enables regulation from as low as 3.5 V input to 3.3 V output while maintaining stability across –40°C to +150°C junction temperature.
It features automatic light-load PFM/PWM transition, pin-selectable forced PWM mode via FPWM input, and built-in 3-ms RESET release timer with internal glitch filtering. The device uses a 0.993–1.007-V internal reference and supports output adjustment from 1 V to 20 V in adjustable variants - though LMS36555QRNLRQ1 is factory-configured for fixed 5-V output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 5.5 A continuous - supports high-power automotive ECUs without external current boosting. |
| Input Voltage Range | 3.5 V to 36 V - accommodates cold-crank (3.5 V) and load-dump (42 V transient) conditions per ISO 7637-2. |
| Switching Frequency | 400 kHz ±10% - enables compact 2.2-µH inductors and reduces EMI filter size. |
| Quiescent Current | 18 µA at 3.3 VOUT, no load - extends battery life in always-on automotive modules. |
| Reference Accuracy | ±1.5% over –40°C to +125°C ambient - ensures stable 5-V rail for USB and camera interfaces. |
| RESET Output | Open-drain with 3-ms release timer and 24-µs glitch filter - replaces discrete supervisor ICs in safety-critical systems. |
| Thermal Shutdown | 160°C trip, 15°C hysteresis - protects against sustained overload in enclosed ECU enclosures. |
Pinout & Package
The LMS36555QRNLRQ1 is housed in a 22-pin VQFN (RNL) package measuring 4.0 mm × 5.0 mm with wettable flanks for automated optical inspection. Thermal resistance is 29.4°C/W (junction-to-ambient, PCB-mounted).
| 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. |
| 2 CBOOT | Bootstrap capacitor node | Drives high-side MOSFET gate; connects to SW via 470-nF capacitor. |
| 3 SYNC | External clock input | Accepts 250–500 kHz system clock for EMI reduction via synchronization. |
| 4,14 PVIN1/PVIN2 | Main power inputs | Parallel high-current VIN paths; must be shorted on PCB with local 10-µF ceramic bypass. |
| 5,10 PGND1/PGND2 | Power ground terminals | Low-inductance return for internal MOSFETs; tied directly to AGND and system ground plane. |
| 9 SW | Switch node | Connects to power inductor; high dv/dt node requiring minimized loop area. |
| 15 AVIN | Analog supply input | Bias source for error amplifier; connected to PVIN on PCB. |
| 16 FPWM | Mode control input | High = forced PWM (no PFM); low = automatic light-load mode; must not float. |
| 18 EN | Enable input | Active-high logic control; 1.7–2.0 V threshold with 0.5 V hysteresis. |
| 19 RESET | Open-drain fault flag | Asserts low during UVLO, overtemperature, or EN deactivation; requires external pullup. |
| 20 AGND | Analog ground reference | Star point for FB, BIAS, and internal analog circuits; connected to PGND under thermal pad. |
| 21 FB | Feedback input | Monitors regulated 5-V output directly (fixed version); no external divider required. |
| 22 BIAS | Auxiliary bias input | Connected to output for improved light-load efficiency; grounded if unused. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated high-side/low-side MOSFETs | RDSON of 60–130 mΩ (HS) and 40–80 mΩ (LS) enables 5.5-A output without external switches. |
| Automotive qualification | AEC-Q100 Grade 1 (–40°C to +125°C ambient) and HBM ±2500 V / CDM ±1000 V ESD rated. |
| Low EMI design | Flip-chip construction and optimized layout reduce switch-node ringing and conducted emissions. |
| Internal compensation | Eliminates external compensation network - simplifies design and improves production yield. |
| Dropout performance | 0.65–0.85 V dropout at 5.5-A load ensures regulation during low-input transients. |
Applications
| Automotive USB Charging | Surround-View System ECU |
|---|---|
|
Use Scenario: Powering dual-port 5-V USB Type-A outputs in center console or rear-seat modules. IC Role / Device Role / Timing Role: Primary 5-V buck regulator supplying USB PD sink circuitry and port controllers. Use Value: 96% efficiency at 12 V → 5 V minimizes heat buildup in confined spaces; 42-V transient tolerance withstands load-dump events. |
Use Scenario: Providing stable 5-V rail to image signal processors and MIPI CSI-2 serializer ICs in multi-camera fusion units. IC Role / Device Role / Timing Role: Main power stage for vision processing subsystems requiring low-noise, tightly regulated 5 V. Use Value: ±1.5% reference accuracy and 3.5-V min input enable reliable startup during cold-crank; RESET output validates power integrity before camera initialization. |
| Mechanically Scanning LIDAR | Driver Monitoring System |
|
Use Scenario: Supplying 5-V logic and analog bias to laser diode drivers and time-of-flight (ToF) sensor interfaces. IC Role / Device Role / Timing Role: High-current, low-EMI DC/DC stage feeding precision analog front-ends and FPGA I/O banks. Use Value: 400-kHz fixed frequency allows predictable EMI filtering; frequency sync input aligns switching noise away from ToF measurement windows. |
Use Scenario: Powering infrared LED drivers and CMOS image sensors in cabin-facing driver attention monitoring cameras. IC Role / Device Role / Timing Role: Always-on 5-V supply with ultra-low quiescent current for battery-backed operation during vehicle sleep mode. Use Value: 18-µA IQ_VIN extends 12-V battery runtime; thermal shutdown and RESET ensure fail-safe behavior during prolonged IR illumination. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM61480QRNLRQ1 | 6-A output, 2.5-V to 36-V input, 2.1-MHz switching, lower IQ (15 µA), but no integrated SYNC input. | Better suited for space-constrained designs needing higher frequency; lacks RESET output with built-in timer. | Select when board area is critical and external supervision is acceptable. |
| TPS54560QDGQRQ1 | 5.5-A output, 3.5-V to 60-V input, 100–2500-kHz adjustable frequency, but higher IQ (65 µA) and no wettable flanks. | Supports wider input range including 48-V industrial buses; lacks AEC-Q100 Grade 1 extended temperature validation. | Select for 48-V hybrid architectures where Grade 1 ambient rating is not mandatory. |
Compared with LM61480QRNLRQ1 and TPS54560QDGQRQ1, the LMS36555QRNLRQ1 uniquely combines AEC-Q100 Grade 1 qualification, integrated RESET with 3-ms release, wettable flanks for AOI, and 400-kHz fixed frequency with SYNC capability - making it optimal for cost-sensitive, safety-aware automotive ADAS power rails.
Availability
LMS36555QRNLRQ1 is available at Aetrix Electronics and suitable for automotive USB charging, surround-view ECU, and mechanically scanning LIDAR applications requiring stable component supply, AEC-Q100 compliance, and long-term automotive lifecycle support.
Supply support for LMS36555QRNLRQ1 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 is designed specifically for high-reliability automotive power conversion - targeting ADAS, infotainment, and body electronics where wide input range, low quiescent current, and AEC-Q100 Grade 1 operation are mandatory.
FAQ
What is the maximum input voltage rating for the LMS36555QRNLRQ1, and how does it handle transients?
The LMS36555QRNLRQ1 has an absolute maximum input voltage rating of 40 V across AVIN, PVIN1, and PVIN2 pins. It sustains 42-V transients for ≤500 ms at ≤0.01% duty cycle per ISO 7637-2 Pulse 5a, easing surge protection design in automotive environments. This transient tolerance is validated per manufacturer specifications and eliminates need for external TVS clamping in many 12-V and 24-V systems.
Does the LMS36555QRNLRQ1 require external compensation components?
No, the LMS36555QRNLRQ1 includes fully integrated compensation circuitry. Its peak current mode control architecture and internal error amplifier compensation network eliminate the need for external RC networks or type-II/type-III compensators - reducing BOM count, PCB area, and design validation effort for the fixed 5-V output variant.
How does the RESET output of the LMS36555QRNLRQ1 function, and what timing parameters apply?
The LMS36555QRNLRQ1 provides an open-drain RESET output that asserts low during EN deactivation, input UVLO, or thermal shutdown. It features a built-in 24-µs glitch filter and a 3-ms release timer after fault clearance. The RESET upper threshold is 107% of VOUT and lower threshold is 94%, ensuring robust power-good signaling without external supervision ICs.
Can the LMS36555QRNLRQ1 operate from a 3.5-V input, and under what conditions?
Yes, the LMS36555QRNLRQ1 supports minimum input voltage of 3.5 V after startup for full functionality at 5.5-A load, per Section 7.7 of the datasheet. This enables reliable operation during automotive cold-crank events. However, startup requires ≥3.9 V input; below that, the device remains in UVLO until voltage rises above the 3.55-V rising threshold.
What package type and thermal characteristics define the LMS36555QRNLRQ1?
The LMS36555QRNLRQ1 uses a 22-pin VQFN (RNL) package sized 4.0 mm × 5.0 mm with wettable flanks. When mounted on a thermally optimized 4-layer FR4 PCB, its junction-to-ambient thermal resistance is 29.4°C/W, and junction-to-board is 5.4°C/W - enabling 5.5-A continuous output with standard copper pour and thermal vias under the exposed pad.
LMS36555QRNLRQ1 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)
LMS36555QRNLRQ1 FAQ
1.How can I place an order for LMS36555QRNLRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMS36555QRNLRQ1 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 LMS36555QRNLRQ1 reliable?
The price and inventory of LMS36555QRNLRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMS36555QRNLRQ1 is usually 5 days.
3.What payment methods are accepted for LMS36555QRNLRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMS36555QRNLRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMS36555QRNLRQ1?
LMS36555QRNLRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMS36555QRNLRQ1 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 LMS36555QRNLRQ1?
For technical support, including LMS36555QRNLRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMS36555QRNLRQ1 requirements.
6.How does Aetrix verify that LMS36555QRNLRQ1 is sourced from the original manufacturer or authorized distributors?
All LMS36555QRNLRQ1 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 LMS36555QRNLRQ1 meets industry standards.
7.What is the process for return or replacement of LMS36555QRNLRQ1?
All LMS36555QRNLRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMS36555QRNLRQ1, 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 LMS36555QRNLRQ1 part is unused and in its original packaging.
Return procedure for LMS36555QRNLRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMS36555QRNLRQ1 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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