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Texas Instruments LMS3655AQRNLRQ1
- Part No.:
- LMS3655AQRNLRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 22-PowerVFQFN
- Datasheet:
-
LMS3655AQRNLRQ1.pdf
- Description:
- IC REG BUCK ADJ 5.5A 22VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,292
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Product details
Overview
LMS3655AQRNLRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous buck converter delivering up to 5.5 A continuous output current, 400-kHz fixed switching frequency (±10%), and adjustable output voltage from 1 V to 20 V. It operates from 3.5 V to 36 V input, supports external synchronization, and integrates RESET with 3-ms release timer - used in vehicle-to-vehicle communication ECUs and mechanically scanning LIDAR power rails.
For engineers reviewing the LMS3655AQRNLRQ1 datasheet, LMS3655AQRNLRQ1 pinout, LMS3655AQRNLRQ1 application, or LMS3655AQRNLRQ1 equivalent, key selection criteria include its 5.5-A rated current capability, wettable-flank 22-pin VQFN package, ±1.5% reference tolerance, 18-µA quiescent current at 3.3 VOUT, and AEC-Q100 qualification for ambient temperatures from –40°C to +125°C.
Technical Context
The LMS3655AQRNLRQ1 employs peak-current-mode control with built-in compensation and automatic light-load PFM/PWM transition to maintain high efficiency across load ranges. Its flip-chip construction minimizes switch-node ringing and EMI, while frequency foldback enables regulation down to 3.5-V input for 3.3-V output.
It features integrated high-side and low-side MOSFETs with 60–130 mΩ and 40–80 mΩ RDS(on), respectively, thermal shutdown at 160–185°C, and a dedicated BIAS pin supporting extended output adjustment up to 20 V when externally powered or grounded.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 5.5 A continuous - supports high-power automotive subsystems 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-tolerant) conditions |
| Switching Frequency | 400 kHz ±10% - enables compact magnetics and predictable EMI filtering design |
| Reference Voltage Tolerance | ±1.5% - ensures tight output regulation across temperature and line/load variations |
| Quiescent Current | 18 µA at 3.3 VOUT, no load - extends battery life in always-on automotive modules |
| Reset Output | Open-drain with internal 3-ms release timer and 24-µs glitch filter - eliminates need for external supervisor IC |
| Junction Temperature Range | –40°C to +150°C - meets AEC-Q100 Grade 1 requirements for under-hood deployment |
Pinout & Package
Package: 22-pin VQFN (RNL), 4.0 mm × 5.0 mm, wettable flanks - enables automated optical solder-joint inspection without x-ray.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VCC | Internal 3.1-V LDO output | Power source for internal control circuitry; requires 4.7-µF capacitor to AGND |
| 2 CBOOT | Bootstrap capacitor node | Drives high-side MOSFET gate; connects via 470-nF capacitor to SW |
| 3 SYNC | Frequency synchronization input | Accepts 250–500 kHz external clock; rising-edge triggered |
| 4,14 PVIN1/PVIN2 | Main power inputs | Parallel-connected VIN pins reduce IR drop and thermal stress at high current |
| 5,10 PGND1/PGND2 | Power ground returns | Must be shorted on PCB to minimize ground bounce and improve current sharing |
| 9 SW | Switch node | Connects to power inductor; critical for EMI layout - minimized parasitic inductance via flip-chip design |
| 15 AVIN | Analog supply input | Tied to PVIN on PCB; powers analog blocks including error amplifier and reference |
| 16 FPWM | Forced PWM mode control | High = fixed-frequency operation; low = automatic light-load mode; must not float |
| 18 EN | Enable input | Active-high logic; 1.7–2.0 V threshold with 0.45–0.55 V hysteresis; supports direct VIN connection |
| 19 RESET | Open-drain fault indicator | Asserts low during UVLO, overtemperature, or EN deactivation; includes internal 3-ms release timer |
| 20 AGND | Analog ground reference | Single-point connection point for FB, VCC, and AVIN; must tie to PGND on PCB |
| 21 FB | Feedback input | Monitors output via resistor divider; 1.0-V internal reference enables 1–20 V adjustable range |
| 22 BIAS | Auxiliary bias regulator input | Connected to VOUT for >6 V operation; grounded or externally powered for 1–20 V range |
Key Features
| Feature | Design Value |
|---|---|
| Integrated high- and low-side MOSFETs | Eliminates external power switches and reduces bill-of-materials count by two active components |
| Automatic light-load PFM/PWM transition | Maintains >90% efficiency at 100 µA load while preserving fast transient response |
| Wettable-flank VQFN package | Enables AOI-based solder-joint verification - critical for automotive zero-defect manufacturing |
| Frequency foldback architecture | Allows stable 3.3-V output regulation from as low as 3.5-V input - essential for cold-crank operation |
| Built-in soft-start and current limiting | 2.5–5 ms programmable soft-start and 6.7–9.5 A high-side current limit prevent inrush and short-circuit damage |
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 infotainment. IC Role / Device Role / Timing Role: Primary 5-V buck regulator supplying USB controller, PHY, and charging ICs with precise voltage and low ripple. Use Value: 94% efficiency at 3.5-A load and 18-µA quiescent current extend battery runtime during vehicle-off monitoring states. |
Use Scenario: Supplying image signal processor (ISP), CMOS sensor, and eye-tracking ASIC in driver-facing camera module. IC Role / Device Role / Timing Role: Adjustable 1.8-V or 2.8-V rail generator with tight regulation and low noise for analog front-end stability. Use Value: ±1.5% reference tolerance and <24-µs RESET glitch filter ensure deterministic startup and fault reporting for ASIL-B compliance. |
| Surround View System ECU | Mechanically Scanning LIDAR |
Use Scenario: Providing 3.3-V and 5-V rails to multi-camera fusion processor, CAN transceivers, and memory interfaces in 360° video ECU. IC Role / Device Role / Timing Role: Dual-output capable via parallel configuration; delivers stable power under wide input transients (3.5–36 V). Use Value: 400-kHz fixed frequency simplifies EMI filter design across multiple synchronized converters in dense PCB layouts. |
Use Scenario: Generating 5-V/5.5-A rail for laser diode driver, FPGA, and ADC in rotating LIDAR head with space-constrained mechanical envelope. IC Role / Device Role / Timing Role: High-current, high-efficiency step-down regulator operating at junction temperatures up to +150°C near motorized optics. Use Value: Flip-chip VQFN package and optimized switch-node layout reduce radiated emissions - critical for meeting CISPR-25 Class 5 limits. |
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 rating, 2.1-MHz switching, smaller 12-pin VQFN (3 mm × 4 mm); higher IQ (26 µA) | Better suited for space-constrained, high-frequency designs requiring faster transient response | Select when board area is limited and 2.1-MHz operation enables smaller inductors/capacitors |
| TPS54560QDGQRQ1 | 5.5-A rating, 100–2500 kHz adjustable frequency, larger 10-pin MSOP-PowerPAD; no integrated BIAS pin or RESET | Requires external supervisor and bias network; less integrated but offers wider frequency tuning | Select when system-level timing coordination demands variable frequency or legacy footprint compatibility |
Compared with LM61480QRNLRQ1 and TPS54560QDGQRQ1, the LMS3655AQRNLRQ1 provides superior integration (RESET, BIAS, wettable flanks), lower quiescent current, and AEC-Q100-qualified thermal performance - making it optimal for cost-sensitive, high-reliability automotive power rails where board space is secondary to functional safety and manufacturability.
Availability
LMS3655AQRNLRQ1 is available at Aetrix Electronics and suitable for automotive USB charge, driver monitoring systems, surround view ECUs, and mechanically scanning LIDAR requiring stable component supply across extended temperature and lifecycle requirements.
Supply support for LMS3655AQRNLRQ1 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 innovation in high-reliability electronics.
The LMS3655-Q1 product line is designed specifically for AEC-Q100 Grade 1 automotive power conversion - targeting demanding under-hood and ADAS applications requiring high current, wide input range, and robust thermal performance.
FAQ
What is the maximum output current capability of the LMS3655AQRNLRQ1?
The LMS3655AQRNLRQ1 delivers up to 5.5 A continuous output current under recommended operating conditions (TA ≤ 125°C, proper PCB thermal design). This rating applies to both fixed 3.3-V/5-V and adjustable output configurations, verified across the full –40°C to +125°C ambient range per AEC-Q100 requirements. The LMS3655AQRNLRQ1 achieves this with integrated 60–130 mΩ high-side and 40–80 mΩ low-side MOSFETs.
Does the LMS3655AQRNLRQ1 support adjustable output voltage, and what is the range?
Yes, the LMS3655AQRNLRQ1 supports adjustable output voltage using an external resistor divider on the FB pin. Its internal 1.0-V reference enables a standard range of 1 V to 20 V. Operation below 3.3 V or above 6 V requires grounding or externally powering the BIAS pin, and extended-range operation (1–20 V) is fully specified with appropriate external component selection per the datasheet's Section 7.3.
What package type and mounting features does the LMS3655AQRNLRQ1 use?
The LMS3655AQRNLRQ1 uses a 22-pin VQFN (RNL) package measuring 4.0 mm × 5.0 mm with wettable flanks. This feature allows automated optical inspection (AOI) of solder joints without x-ray, fulfilling automotive zero-defect manufacturing requirements. The device employs flip-chip construction to minimize parasitic inductance and improve EMI performance.
How does the RESET function operate on the LMS3655AQRNLRQ1?
The LMS3655AQRNLRQ1 provides an open-drain RESET output with built-in 24-µs glitch filtering and a 3-ms release timer after fault clearance. It asserts low during EN deactivation, UVLO, or thermal shutdown, and releases high only after the output stabilizes and the timer expires. The RESET pin requires an external pull-up resistor and is referenced to AGND, eliminating need for discrete supervisor ICs.
Is the LMS3655AQRNLRQ1 qualified for automotive applications, and what grade does it meet?
Yes, the LMS3655AQRNLRQ1 is AEC-Q100 qualified for automotive applications and meets Grade 1 specifications: ambient operating temperature from –40°C to +125°C, HBM ESD classification level 2 (±2500 V), and CDM level C6 (±1000 V). Its junction temperature rating extends to +150°C, and all electrical characteristics are ensured across this full range per TI's production test flow.
LMS3655AQRNLRQ1 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)
LMS3655AQRNLRQ1 FAQ
1.How can I place an order for LMS3655AQRNLRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMS3655AQRNLRQ1 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 LMS3655AQRNLRQ1 reliable?
The price and inventory of LMS3655AQRNLRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMS3655AQRNLRQ1 is usually 5 days.
3.What payment methods are accepted for LMS3655AQRNLRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMS3655AQRNLRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMS3655AQRNLRQ1?
LMS3655AQRNLRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMS3655AQRNLRQ1 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 LMS3655AQRNLRQ1?
For technical support, including LMS3655AQRNLRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMS3655AQRNLRQ1 requirements.
6.How does Aetrix verify that LMS3655AQRNLRQ1 is sourced from the original manufacturer or authorized distributors?
All LMS3655AQRNLRQ1 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 LMS3655AQRNLRQ1 meets industry standards.
7.What is the process for return or replacement of LMS3655AQRNLRQ1?
All LMS3655AQRNLRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMS3655AQRNLRQ1, 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 LMS3655AQRNLRQ1 part is unused and in its original packaging.
Return procedure for LMS3655AQRNLRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMS3655AQRNLRQ1 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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