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Texas Instruments LMS3655MQRNLRQ1
- Part No.:
- LMS3655MQRNLRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 22-PowerVFQFN
- Datasheet:
-
LMS3655MQRNLRQ1.pdf
- Description:
- IC REG BUCK ADJ 5.5A 22VQFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LMS3655MQRNLRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous buck converter delivering up to 5.5 A continuous output current, operating from 3.9 V to 36 V input, with fixed 400-kHz switching frequency and adjustable output (1 V to 20 V). It integrates high-side/low-side MOSFETs, internal compensation, soft-start, thermal shutdown, and a filtered open-drain RESET output-designed for mechanically scanning LIDAR and surround-view ECU power rails.
For engineers reviewing the LMS3655MQRNLRQ1 datasheet, LMS3655MQRNLRQ1 pinout, LMS3655MQRNLRQ1 application, or LMS3655MQRNLRQ1 equivalent, key selection criteria include its 5.5-A rated output, ±1.5% reference tolerance, 18-µA quiescent current at 3.3 VOUT, spread-spectrum EMI reduction, and AEC-Q100 qualification for under-hood automotive use.
Technical Context
The LMS3655MQRNLRQ1 employs peak-current-mode control with built-in frequency foldback, enabling stable regulation down to 3.5 V input for 3.3-V output-critical for cold-crank scenarios. Its flip-chip VQFN package minimizes parasitic inductance, reducing switch-node ringing and conducted EMI without external filters.
It supports external synchronization (250–500 kHz), pin-selectable forced PWM mode, and automatic light-load PFM/PWM transition. The integrated 3-ms RESET release timer with internal filtering eliminates need for external supervisory ICs in safety-critical automotive subsystems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 5.5 A continuous-supports high-power imaging sensors and SoC core rails in ADAS ECUs |
| Input Voltage Range | 3.9 V to 36 V (transient tolerant to 42 V for ≤500 ms)-enables direct battery connection with minimal surge protection |
| Switching Frequency | 400 kHz ±10%, with external sync capability-allows fixed-frequency design and EMI alignment with system clocks |
| Quiescent Current | 18 µA at 3.3 VOUT, no load-extends battery life in always-on vehicle-to-vehicle modules |
| Reference Voltage Tolerance | ±1.5% over –40°C to +125°C ambient-ensures tight output regulation across automotive temperature range |
| RESET Output | Open-drain with 3-ms release timer and internal glitch filter-provides reliable power-good signaling without external RC networks |
| EMI Reduction | Spread-spectrum enabled (±3% frequency modulation)-reduces peak conducted emissions per CISPR 25 Class 5 |
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 performance on 4-layer PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VCC | Internal 3.1-V LDO output | Power supply for internal control circuitry; requires 4.7-µF ceramic capacitor to AGND |
| 2 CBOOT | Bootstrap capacitor node | Drives high-side gate; connects via 470-nF capacitor to SW for efficient bootstrapping |
| 3 SYNC | External clock input | Accepts 250–500 kHz rising-edge-triggered sync signal for system-level EMI coordination |
| 4,14 PVIN1/PVIN2 | Main power inputs | Dual input pins reduce IR drop and thermal stress; must be shorted directly on PCB |
| 5,10 PGND1/PGND2 | Power ground terminals | Low-inductance return paths for internal MOSFETs; tied together and connected to AGND |
| 9 SW | Switch node | Connects to power inductor; low-ringing waveform due to flip-chip layout and minimized loop inductance |
| 15 AVIN | Analog input supply | Bias source for analog circuits; connected to PVIN on PCB for noise isolation |
| 16 FPWM | Mode control input | High = forced PWM (no light-load discontinuity); low = automatic PFM/PWM transition |
| 18 EN | Enable input | Active-high logic; 1.7–2.0 V threshold with 0.5 V hysteresis ensures robust start-up sequencing |
| 19 RESET | Open-drain status flag | Asserts low during fault or EN deactivation; includes 24-µs internal filter and 3-ms release delay |
| 20 AGND | Analog ground reference | Reference point for FB, VREF, and internal error amplifier; must be star-connected to PGND |
| 21 FB | Feedback input | Monitors output voltage divider; 1.0-V internal reference enables 1–20 V adjustable configuration |
| 22 BIAS | Auxiliary bias input | Improves efficiency at light loads when connected to regulated output; required for >15 V VOUT |
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 |
| Integrated high-side/low-side MOSFETs | RDSON of 60–130 mΩ (HS) and 40–80 mΩ (LS) enables 96% peak efficiency at 12 V → 5 V conversion |
| Automatic light-load PFM mode | Maintains >85% efficiency at 10 mA load-critical for always-on driver monitoring systems |
| Built-in soft-start | 4-ms ramp time (90% of VREF) prevents inrush current and output overshoot during power-up |
| Thermal shutdown with hysteresis | Triggers at 160–185°C junction temperature with 15°C hysteresis-prevents latch-up during transient overload |
| Wettable flank VQFN package | Enables AOI-compatible solder joint inspection without X-ray-reducing automotive manufacturing test cost |
Applications
| Automotive USB Charge | Driver Monitoring |
|---|---|
Use Scenario: Powering dual-port USB Type-C PD modules in center console with 12-V battery input. IC Role / Device Role / Timing Role: Primary 5-V buck regulator supplying USB controller, PHY, and charging ICs. Use Value: Spread-spectrum operation meets CISPR 25 Class 5 conducted EMI limits without added ferrites or shielding. |
Use Scenario: Supplying image sensor, ISP, and low-power MCU in cabin-facing driver attention system. IC Role / Device Role / Timing Role: Always-on 3.3-V rail generator with ultra-low 18-µA IQ to minimize battery drain during vehicle sleep. Use Value: Built-in RESET output replaces discrete supervisor IC, saving 2.5 mm² board area and BOM cost. |
| Surround View System ECU | Mechanically Scanning LIDAR |
Use Scenario: Providing stable 5-V and 3.3-V rails to four camera interfaces and FPGA-based stitching engine. IC Role / Device Role / Timing Role: High-current synchronous buck with external SYNC to align switching edges across multiple LMS3655MQRNLRQ1 units. Use Value: 5.5-A output capacity supports burst-mode processing loads while maintaining <±2% regulation under 10-A transient steps. |
Use Scenario: Generating precision 3.3-V supply for laser diode driver and ADC in rotating LIDAR head. IC Role / Device Role / Timing Role: Input-capable buck converter supporting cold-crank (3.5 V min) with frequency foldback for stable 3.3-V output. Use Value: Flip-chip VQFN layout reduces switch-node ringing, minimizing EMI coupling into sensitive analog front-end circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM61480QRNLRQ1 | Higher 8-A rating, 2.1-MHz switching, no spread spectrum; requires external compensation | Better suited for space-constrained infotainment SoC rails where higher frequency allows smaller inductors | Select when needing >5.5 A or faster transient response; avoid if CISPR 25 Class 5 compliance is mandatory |
| TPS54560QDGQRQ1 | 5.5-A rating, 100-kHz–2.5-MHz adjustable frequency, no integrated high-side FET; external MOSFET required | Offers greater flexibility in efficiency vs. size trade-off but increases component count and layout complexity | Prefer for designs requiring wide frequency tuning or discrete MOSFET optimization; not drop-in compatible |
Compared with LM61480QRNLRQ1 and TPS54560QDGQRQ1, the LMS3655MQRNLRQ1 delivers optimal balance of AEC-Q100 reliability, integrated EMI mitigation, and minimal external components for mid-power ADAS subsystems-without sacrificing thermal performance or automotive qualification rigor.
Availability
LMS3655MQRNLRQ1 is available at Aetrix Electronics and suitable for automotive USB charge, driver monitoring, surround view system ECU, and mechanically scanning LIDAR applications requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for LMS3655MQRNLRQ1 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 company specializing in analog and embedded processing technologies, with leadership in automotive-grade power management ICs and rigorous AEC-Q100 validation processes.
The LMS3655-Q1 product line was designed specifically for high-reliability automotive ADAS and infotainment subsystems, emphasizing low EMI, cold-crank operation, and integrated supervision to reduce system-level component count.
FAQ
What is the maximum output current capability of the LMS3655MQRNLRQ1?
The LMS3655MQRNLRQ1 delivers up to 5.5 A continuous output current under recommended operating conditions (TA ≤ 125°C, proper PCB thermal design). This rating applies to all output voltage configurations-fixed 3.3 V, fixed 5 V, or adjustable 1 V to 20 V-and is validated across the full AEC-Q100 Grade 1 temperature range (–40°C to +125°C ambient).
Does the LMS3655MQRNLRQ1 support spread-spectrum frequency modulation?
Yes, the LMS3655MQRNLRQ1 includes hardware-enabled spread-spectrum operation with ±3% frequency deviation and 1.2-Hz modulation pattern frequency. This feature is activated by the "M" suffix in the part number (LMS3655MQRNLRQ1) and reduces peak conducted EMI amplitude-critical for meeting CISPR 25 Class 5 requirements in automotive applications without additional filtering components.
What package type and dimensions does the LMS3655MQRNLRQ1 use?
The LMS3655MQRNLRQ1 uses a 22-pin VQFN package (RNL variant) with wettable flanks, measuring 4.0 mm × 5.0 mm and 0.9-mm height. Its flip-chip construction minimizes bond wire inductance, improving switch-node integrity and thermal resistance (RθJA = 29.4°C/W on 4-layer FR4 board), and enables automated optical inspection of solder joints.
How does the RESET output function on the LMS3655MQRNLRQ1?
The LMS3655MQRNLRQ1 features an open-drain RESET output with internal 24-µs glitch filter and 3-ms release timer. It asserts low when EN is de-asserted, output falls below 92–96.5% of setpoint, or thermal shutdown occurs. The output remains low for ≥3 ms after fault clearance, providing clean power-good signaling without external timing components-replacing discrete supervisors in ADAS ECUs.
Is the LMS3655MQRNLRQ1 qualified for automotive applications?
Yes, the LMS3655MQRNLRQ1 is AEC-Q100 qualified for automotive use (Grade 1: –40°C to +125°C ambient), with device-level HBM ±2.5 kV and CDM ±1 kV ESD ratings. It undergoes full automotive qualification testing-including lifetime reliability, thermal cycling, and humidity bias-making it suitable for safety-critical ADAS subsystems such as surround-view cameras and LIDAR control units.
LMS3655MQRNLRQ1 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:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3.9V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 1V
- Voltage - Output (Max):
- 15V
- 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)
LMS3655MQRNLRQ1 FAQ
1.How can I place an order for LMS3655MQRNLRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMS3655MQRNLRQ1 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 LMS3655MQRNLRQ1 reliable?
The price and inventory of LMS3655MQRNLRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMS3655MQRNLRQ1 is usually 5 days.
3.What payment methods are accepted for LMS3655MQRNLRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMS3655MQRNLRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMS3655MQRNLRQ1?
LMS3655MQRNLRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMS3655MQRNLRQ1 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 LMS3655MQRNLRQ1?
For technical support, including LMS3655MQRNLRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMS3655MQRNLRQ1 requirements.
6.How does Aetrix verify that LMS3655MQRNLRQ1 is sourced from the original manufacturer or authorized distributors?
All LMS3655MQRNLRQ1 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 LMS3655MQRNLRQ1 meets industry standards.
7.What is the process for return or replacement of LMS3655MQRNLRQ1?
All LMS3655MQRNLRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMS3655MQRNLRQ1, 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 LMS3655MQRNLRQ1 part is unused and in its original packaging.
Return procedure for LMS3655MQRNLRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMS3655MQRNLRQ1 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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