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Texas Instruments LMS3655MQURNLRQ1
- Part No.:
- LMS3655MQURNLRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 22-PowerVFQFN
- Datasheet:
-
LMS3655MQURNLRQ1.pdf
- Description:
- IC REG BUCK ADJ 5.5A 22VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,135
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Product details
Overview
LMS3655MQURNLRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous buck converter delivering up to 5.5 A continuous output current, operating from 3.5 V to 36 V input, with fixed 400-kHz switching frequency and adjustable 1 V–20 V output voltage. It integrates high-side/low-side MOSFETs, internal compensation, soft-start, thermal shutdown, and a filtered open-drain RESET output - deployed in vehicle-to-vehicle communication ECUs requiring robust 5-V rail generation under cold-crank conditions.
For engineers reviewing the LMS3655MQURNLRQ1 datasheet, LMS3655MQURNLRQ1 pinout, LMS3655MQURNLRQ1 application, or LMS3655MQURNLRQ1 equivalent, key selection criteria include its 5.5-A rated current capability, 18-µA quiescent current at 3.3 VOUT, ±1.5% reference tolerance, 3.5-V minimum start-up input, and spread-spectrum EMI reduction - all validated for –40°C to +125°C ambient operation in automotive power systems.
Technical Context
The LMS3655MQURNLRQ1 employs peak-current-mode control with integrated gate drivers and flip-chip VQFN packaging to minimize parasitic inductance and switch-node ringing. Its frequency foldback architecture enables regulation down to 3.5-V input while maintaining 3.3-V output, and external SYNC input allows synchronization to system clocks between 250 kHz and 500 kHz.
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 glitch filtering. The BIAS pin supports auxiliary biasing for extended output ranges up to 20 V, and the device sustains 42-V transients for ≤500 ms at 0.01% duty cycle.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 5.5 A continuous - supports high-power ADAS domain controllers without external current boosting |
| Input Voltage Range | 3.5 V to 36 V - operates through automotive cold-crank (≥3.5 V) and load-dump (≤42 V transient) |
| Switching Frequency | 400 kHz ±10% - enables compact 2.2-µH inductors and predictable EMI filter design |
| Quiescent Current | 18 µA at 3.3 VOUT, no load - extends battery life in always-on vehicle networks |
| Reference Tolerance | ±1.5% over –40°C to +125°C - ensures stable 5-V USB charging compliance across temperature |
| RESET Delay | 3-ms release timer with 24-µs glitch filter - eliminates need for external supervisor IC in safety-critical ECUs |
| Thermal Shutdown | 160°C trip, 15°C hysteresis - protects against sustained overload in enclosed ECU enclosures |
Pinout & Package
The LMS3655MQURNLRQ1 is housed in a 22-pin VQFN (RNL) package measuring 4.0 mm × 5.0 mm with non-wettable flanks, optimized for automotive thermal and reliability requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Internal 3.1-V LDO output | Power source for internal control circuitry; requires 4.7-µF ceramic capacitor to AGND |
| CBOOT | Bootstrap capacitor node | Drives high-side MOSFET gate; connects to SW via 470-nF capacitor |
| SYNC | External clock input | Accepts 250–500 kHz system clock; rising-edge triggered for deterministic timing alignment |
| PVIN1 / PVIN2 | Main power inputs | Parallel-connected VIN pins reduce PCB trace resistance and thermal stress under 5.5-A load |
| SW | Switch node | Connects directly to power inductor; low-ringing waveform due to flip-chip layout and minimized loop inductance |
| PGND1 / PGND2 | Power ground terminals | Must be shorted on PCB to handle high di/dt return currents; tied to AGND at single point |
| EN | Enable control input | Active-high logic; 1.7–2.0 V threshold with 0.5 V hysteresis prevents false turn-on during supply ramp |
| RESET | Open-drain fault flag | Asserts low on UVLO, thermal shutdown, or EN deactivation; requires external pull-up resistor |
| FB | Feedback input | Monitors output via resistor divider; 1.0-V internal reference enables 1–20 V adjustable configurations |
| BIAS | Auxiliary bias input | Connected to output for >6 V operation; grounds or supplies externally for 1–20 V range compliance |
Key Features
| Feature | Design Value |
|---|---|
| Integrated high-/low-side MOSFETs | Eliminates external power switches; 60 mΩ HS / 40 mΩ LS RDS(on) at 13 V enables <0.85 V dropout at 5.5 A |
| Spread-spectrum modulation | ±3% frequency dithering reduces peak conducted EMI by >10 dB in 150-kHz–30-MHz band |
| Automatic light-load mode | Transitions seamlessly to diode-emulation PFM below ~200 mA, maintaining >85% efficiency at 1-mA load |
| Pin-selectable forced PWM | FPWM pin overrides auto-mode; ensures constant 400-kHz operation for noise-sensitive ADC or camera timing |
| Built-in soft-start | 4-ms internal ramp prevents inrush current; eliminates need for external SS capacitor or sequencing controller |
Applications
| Automotive USB Charge | Driver Monitoring System |
|---|---|
Use Scenario: Powering dual-port 5-V/3-A USB Type-C PD modules in center console or rear-seat entertainment units. IC Role / Device Role / Timing Role: Primary 12-V-to-5-V buck regulator with precise 5-V output regulation and fast transient response to dynamic load steps. Use Value: ±1.5% reference tolerance and 18-µA IQ ensure USB compliance across battery voltage swings (9–16 V) and ignition-off leakage budgets. | Use Scenario: Supplying image signal processor (ISP) and CMOS sensor in cabin-facing driver attention monitoring cameras. IC Role / Device Role / Timing Role: High-efficiency 3.3-V rail generator with low-noise operation and RESET supervision for safe boot and fault reporting. Use Value: 92% efficiency at 3.3 V/3.5 A and integrated 3-ms RESET release enable deterministic ISP initialization after power-up. |
| Surround View System ECU | Mechanically Scanning LIDAR |
Use Scenario: Providing stable 5-V and 3.3-V rails to multi-camera fusion processors and CAN FD interface ICs in 360° surround-view ECUs. IC Role / Device Role / Timing Role: Dual-output capable buck controller (via feedback configuration) with synchronized switching to minimize beat-frequency noise coupling into analog video paths. Use Value: External SYNC input allows alignment of switching edges across multiple LMS3655MQURNLRQ1 devices, reducing differential EMI in tightly packed camera harnesses. | Use Scenario: Generating 5-V bias for MEMS mirror drivers and 3.3-V logic for FPGA-based timing control in long-range mechanical LIDAR units. IC Role / Device Role / Timing Role: High-current, low-EMI DC/DC stage supporting rapid laser pulse modulation and precision analog front-end conditioning. Use Value: Low switch-node ringing and spread-spectrum operation meet CISPR-25 Class 5 radiated emissions limits without added shielding or ferrites. |
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, 12-µA IQ | Better suited for space-constrained infotainment SoC rails; lacks RESET output and automotive-grade thermal specs | Select when higher frequency and smaller magnetics outweigh need for integrated fault signaling and cold-crank support |
| TPS54560QDGQRQ1 | 5.5-A rating, 100–2500-kHz adjustable frequency, no integrated RESET, 145-µA IQ | Offers wider frequency tuning but higher quiescent current; requires external supervisor for reset functionality | Choose when system-level clock synchronization is unnecessary and board space permits discrete reset IC integration |
Compared with LM61480QRNLRQ1 and TPS54560QDGQRQ1, the LMS3655MQURNLRQ1 uniquely combines AEC-Q100 Grade 1 qualification, integrated RESET with filtering, 18-µA IQ, and spread-spectrum EMI reduction - making it optimal for cost-sensitive, safety-aware automotive ECUs where component count and thermal margin are critical.
Availability
LMS3655MQURNLRQ1 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 under AEC-Q100-compliant manufacturing and traceable sourcing.
Supply support for LMS3655MQURNLRQ1 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.
The LMS3655-Q1 product line delivers high-current, low-quiescent-current synchronous buck converters engineered specifically for demanding automotive subsystems including ADAS, body electronics, and infotainment - with emphasis on cold-crank operation, EMI robustness, and functional safety readiness.
FAQ
What is the minimum input voltage required for LMS3655MQURNLRQ1 to start regulation?
The LMS3655MQURNLRQ1 has a minimum input voltage of 3.55 V (rising) for reliable start-up under full load. This enables operation during automotive cold-crank events where battery voltage dips to ~3.5 V. Below this threshold, the device remains in undervoltage lockout until VIN exceeds the hysteresis window. The LMS3655MQURNLRQ1 can regulate down to 3.5 V input once started, supporting extended functionality in low-input scenarios.
Does LMS3655MQURNLRQ1 support adjustable output voltages, and what is the supported range?
Yes, the LMS3655MQURNLRQ1 supports adjustable output from 1 V to 20 V using an external resistor divider on the FB pin. The internal 1.0-V reference provides ±1.5% accuracy over temperature. For outputs above 6 V, the BIAS pin must be grounded or supplied externally per datasheet Section 7.3; operation beyond 15 V requires factory consultation due to potential derating of certain specifications.
How does the RESET output of LMS3655MQURNLRQ1 function, and what are its timing characteristics?
The LMS3655MQURNLRQ1 RESET output is an open-drain flag that goes low during EN deactivation, 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 clean power-good signaling without external RC networks - directly replacing discrete supervisors in automotive ECUs.
What package type and thermal performance does LMS3655MQURNLRQ1 use?
The LMS3655MQURNLRQ1 uses a 22-pin VQFN (RNL) package sized 4.0 mm × 5.0 mm with non-wettable flanks. On a thermally optimized 4-layer FR4 board, its junction-to-board thermal resistance is 5.4°C/W and junction-to-ambient is 29.4°C/W. This enables 5.5-A continuous operation at +125°C ambient when properly heatsinked, meeting AEC-Q100 Grade 1 thermal requirements.
Is LMS3655MQURNLRQ1 compatible with external clock synchronization, and what are the valid input parameters?
Yes, the LMS3655MQURNLRQ1 accepts external synchronization via the SYNC pin, supporting input frequencies from 250 kHz to 500 kHz with 25%–75% duty cycle. The device triggers on the rising edge and maintains tight phase alignment. This capability allows ECU-level EMI coordination across multiple switching regulators - critical in multi-rail ADAS domains where beat-frequency noise must be avoided.
LMS3655MQURNLRQ1 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):
- 20V
- Current - Output:
- 5.5A
- Frequency - Switching:
- 400kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 22-VQFN-HR (5x4)
LMS3655MQURNLRQ1 FAQ
1.How can I place an order for LMS3655MQURNLRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMS3655MQURNLRQ1 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 LMS3655MQURNLRQ1 reliable?
The price and inventory of LMS3655MQURNLRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMS3655MQURNLRQ1 is usually 5 days.
3.What payment methods are accepted for LMS3655MQURNLRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMS3655MQURNLRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMS3655MQURNLRQ1?
LMS3655MQURNLRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMS3655MQURNLRQ1 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 LMS3655MQURNLRQ1?
For technical support, including LMS3655MQURNLRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMS3655MQURNLRQ1 requirements.
6.How does Aetrix verify that LMS3655MQURNLRQ1 is sourced from the original manufacturer or authorized distributors?
All LMS3655MQURNLRQ1 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 LMS3655MQURNLRQ1 meets industry standards.
7.What is the process for return or replacement of LMS3655MQURNLRQ1?
All LMS3655MQURNLRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMS3655MQURNLRQ1, 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 LMS3655MQURNLRQ1 part is unused and in its original packaging.
Return procedure for LMS3655MQURNLRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMS3655MQURNLRQ1 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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