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Texas Instruments LMR33620AQ5RNXRQ1
- Part No.:
- LMR33620AQ5RNXRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 12-PowerVFQFN
- Datasheet:
-
LMR33620AQ5RNXRQ1.pdf
- Description:
- IC REG BUCK 5V 2A 12VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,369
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Product details
Overview
LMR33620AQ5RNXRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive-qualified synchronous step-down DC/DC converter delivering 2 A output at fixed 5 V from 3.8 V–36 V input, featuring peak-current-mode control, 400 kHz switching frequency, and integrated 75-mΩ/50-mΩ MOSFETs for infotainment USB charging and telematics power rails.
For engineers reviewing the LMR33620AQ5RNXRQ1 datasheet, LMR33620AQ5RNXRQ1 pinout, LMR33620AQ5RNXRQ1 application, or LMR33620AQ5RNXRQ1 equivalent, key selection criteria include its fixed 5-V output, 400-kHz frequency variant, wettable-flank VQFN-12 package, automotive thermal range (–40°C to +125°C), and functional safety documentation support.
Technical Context
The LMR33620AQ5RNXRQ1 implements peak-current-mode control with automatic PFM/PWM mode transition to maintain high efficiency across load range. It integrates internal compensation, precision enable thresholds (VEN-H = 1.231 V typ), and a power-good flag with glitch-filtered ±2% regulation window referenced to 5-V output.
Its architecture supports ultra-low dropout operation down to 3.8 V input for 5-V output, uses a 68-ns minimum on-time for high VIN/VOUT ratios, and incorporates cycle-by-cycle current limit plus hiccup-mode short-circuit protection triggered below 0.4 V FB voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.8 V to 36 V - supports wide automotive battery transients including cold-crank (≥3.8 V) and load-dump (≤36 V). |
| Output Voltage | Fixed 5 V - eliminates external feedback resistors; regulated to ±1.5% over full temperature and load range. |
| Output Current | 2 A continuous - sufficient for dual USB 2.0 ports or single USB 3.0 port with local regulation. |
| Switching Frequency | 400 kHz - balances EMI performance and inductor size; avoids AM radio band while enabling compact magnetics. |
| Quiescent Current | 25 µA typical - enables always-on systems (e.g., telematics wake-up logic) without excessive battery drain. |
| Shutdown Current | 5 µA max - ensures minimal parasitic draw during vehicle sleep mode. |
| Thermal Shutdown | 165°C activation / 148°C recovery - provides robust overtemperature protection in sealed automotive enclosures. |
Pinout & Package
The LMR33620AQ5RNXRQ1 is housed in a 12-pin VQFN (RNX) package measuring 3.0 mm × 2.0 mm × 0.85 mm with wettable flanks for automated optical inspection and enhanced thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 11 | PGND | Power ground - must be connected to system ground plane and AGND via low-inductance path; bypass capacitor return node. |
| 2, 10 | VIN | Main input supply - requires direct connection to high-quality input capacitor(s); symmetrical layout reduces EMI. |
| 3 | NC | No connect - internally unconnected; PCB trace connects SW to simplify CBOOT routing in VQFN layout. |
| 4 | BOOT | Bootstrap supply - connects to SW via 100-nF ceramic capacitor; enables high-side MOSFET gate drive. |
| 5 | VCC | Internal 5-V LDO output - powers control circuitry; not for external loads; requires 1-µF decoupling to AGND. |
| 6 | AGND | Analog ground reference - star-point for FB, PG, EN; separates noise-sensitive analog paths from power ground. |
| 7 | FB | Feedback input - internally tied to 5-V output divider; must connect directly to VOUT near output capacitor. |
| 8 | PG | Open-drain power-good flag - signals regulation status (high = OK, low = fault); requires external pull-up resistor. |
| 9 | EN | Enable input - precision threshold (1.231 V typ) allows adjustable UVLO; must not float; direct VIN tie acceptable. |
| 12 | SW | Switch node - connects to power inductor; routed to NC pad on PCB to minimize loop area and EMI. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C ambient operation - meets automotive reliability and lifetime requirements. |
| Functional safety documentation | Includes FIT rate, failure modes, and diagnostic coverage data - accelerates ISO 26262 ASIL-B system integration. |
| Integrated compensation network | Eliminates external Type II/III compensation components - reduces BOM count and design iteration time. |
| HotRod™ package with wettable flanks | Reduces parasitic inductance by >50% vs standard QFN - suppresses switch-node ringing and lowers radiated EMI. |
| Peak efficiency >95% | Achieved at mid-load (e.g., 1 A @ 12 V IN → 5 V OUT) - minimizes thermal stress and improves power density. |
Applications
| Infotainment USB Charging | Telematics Control Unit |
|---|---|
Use Scenario: Powering dual USB 2.0 ports in center-stack head unit with battery input ranging from 6 V (cold crank) to 16 V (normal operation). IC Role / Device Role / Timing Role: Primary 5-V buck regulator supplying downstream USB switch and data ICs; operates continuously during vehicle runtime. Use Value: Fixed 5-V output eliminates feedback resistor tolerance error; 2-A rating supports simultaneous charging of two devices at 500 mA each. | Use Scenario: Providing stable 5-V rail to LTE modem, GNSS receiver, and CAN controller in connected vehicle gateway module. IC Role / Device Role / Timing Role: Always-on power source with low 25-µA quiescent current; enables remote wake-up and firmware updates during vehicle sleep. Use Value: AEC-Q100 qualification ensures reliability under vibration and thermal cycling; 400-kHz frequency avoids interference with cellular bands. |
| ADAS Camera Module | Body Control Module |
Use Scenario: Generating 5-V supply for image sensor and ISP in rear-view camera with wide-input automotive battery interface. IC Role / Device Role / Timing Role: Input-stage regulator converting raw battery to clean 5-V; handles load dump transients up to 36 V. Use Value: 36-V absolute maximum input rating and integrated overvoltage protection prevent damage during alternator surge events. | Use Scenario: Powering microcontroller, LIN transceiver, and LED drivers in door module with intermittent 12-V supply. IC Role / Device Role / Timing Role: Main 5-V system rail; enabled only when door is open or key fob detected. Use Value: Precision enable threshold (1.231 V) allows accurate undervoltage lockout at 9 V battery; prevents brownout resets. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR33620BQ5RNXRQ1 | 1.4-MHz switching frequency; same 5-V fixed output, 2-A rating, and VQFN-12 package. | Better suited for space-constrained designs requiring smaller inductors; higher frequency increases light-load switching losses. | Select when board area is critical and EMI filtering can accommodate 1.4 MHz harmonics. |
| LMR33620CQ5RNXRQ1 | 2.1-MHz switching frequency; identical 5-V fixed output, 2-A rating, and VQFN-12 package. | Optimized for ultra-compact layouts and high-density modules; exhibits higher quiescent current than 400-kHz version. | Choose for next-generation telematics modules where PCB real estate is at premium and thermal budget permits. |
Compared with LMR33620AQ5RNXRQ1, the B- and C-variants offer higher switching frequencies for smaller passive components but trade off higher light-load losses and reduced EMI margin; all three share identical pinout, thermal performance, and automotive qualification.
Availability
LMR33620AQ5RNXRQ1 is available at Aetrix Electronics and suitable for automotive infotainment, telematics, and ADAS subsystems requiring stable component supply, long-term lifecycle assurance, and AEC-Q100-compliant sourcing.
Supply support for LMR33620AQ5RNXRQ1 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 LMR336x0-Q1 product line delivers high-efficiency, small-solution-size synchronous buck converters engineered specifically for automotive body electronics, infotainment, and ADAS applications demanding AEC-Q100 qualification and functional safety readiness.
FAQ
What is the output voltage configuration of the LMR33620AQ5RNXRQ1?
The LMR33620AQ5RNXRQ1 features a factory-trimmed fixed 5-V output. Unlike adjustable versions, it does not require external feedback resistors - the FB pin is internally connected to generate precisely 5 V, with regulation accuracy of ±1.5% across –40°C to +125°C and full load range. This simplifies design and improves long-term stability versus resistor-based dividers.
Does the LMR33620AQ5RNXRQ1 support automotive safety-critical systems?
Yes, the LMR33620AQ5RNXRQ1 is functional safety-capable with documentation available to aid ISO 26262 system-level design. It carries AEC-Q100 Grade 1 qualification (–40°C to +125°C), includes FIT rate data, failure mode analysis, and diagnostic coverage metrics - enabling its use in ASIL-B automotive subsystems such as telematics and infotainment power domains.
What package type and dimensions does the LMR33620AQ5RNXRQ1 use?
The LMR33620AQ5RNXRQ1 uses a 12-pin VQFN package (RNX variant) measuring 3.0 mm × 2.0 mm × 0.85 mm with wettable flanks. This HotRod™-enhanced package minimizes parasitic inductance, improves thermal dissipation via exposed thermal pad, and supports automated optical inspection - critical for high-reliability automotive manufacturing.
How does the LMR33620AQ5RNXRQ1 manage efficiency at light loads?
The LMR33620AQ5RNXRQ1 automatically transitions from PWM to PFM mode at light loads, enabling diode emulation and discontinuous conduction mode (DCM). This reduces switching losses and maintains >85% efficiency even at 10-mA output, while its 25-µA operating quiescent current ensures minimal battery drain in always-on automotive subsystems.
Can the LMR33620AQ5RNXRQ1 withstand automotive load dump conditions?
Yes, the LMR33620AQ5RNXRQ1 supports input voltages up to 36 V and has been validated per AEC-Q100 for automotive transients. Its absolute maximum VIN rating is 38 V, and integrated input overvoltage protection, thermal shutdown, and hiccup-mode short-circuit response ensure robust operation during load dump events common in 12-V vehicle electrical systems.
LMR33620AQ5RNXRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 12-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):
- 3.8V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 2A
- Frequency - Switching:
- 400kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 12-VQFN-HR (3x2)
LMR33620AQ5RNXRQ1 FAQ
1.How can I place an order for LMR33620AQ5RNXRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR33620AQ5RNXRQ1 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 LMR33620AQ5RNXRQ1 reliable?
The price and inventory of LMR33620AQ5RNXRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR33620AQ5RNXRQ1 is usually 5 days.
3.What payment methods are accepted for LMR33620AQ5RNXRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR33620AQ5RNXRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR33620AQ5RNXRQ1?
LMR33620AQ5RNXRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR33620AQ5RNXRQ1 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 LMR33620AQ5RNXRQ1?
For technical support, including LMR33620AQ5RNXRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR33620AQ5RNXRQ1 requirements.
6.How does Aetrix verify that LMR33620AQ5RNXRQ1 is sourced from the original manufacturer or authorized distributors?
All LMR33620AQ5RNXRQ1 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 LMR33620AQ5RNXRQ1 meets industry standards.
7.What is the process for return or replacement of LMR33620AQ5RNXRQ1?
All LMR33620AQ5RNXRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMR33620AQ5RNXRQ1, 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 LMR33620AQ5RNXRQ1 part is unused and in its original packaging.
Return procedure for LMR33620AQ5RNXRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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