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Texas Instruments LMR33620CQ3RNXTQ1
- Part No.:
- LMR33620CQ3RNXTQ1
- Manufacturer:
- Texas Instruments
- Package:
- 12-PowerVFQFN
- Datasheet:
-
LMR33620CQ3RNXTQ1.pdf
- Description:
- IC REG BUCK 3.3V 2A 12VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,219
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Product details
Overview
LMR33620CQ3RNXTQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive-qualified synchronous step-down DC/DC converter delivering 2 A output current across 3.8 V to 36 V input, with fixed 3.3 V output, 2.1 MHz switching frequency, and integrated 75 mΩ/50 mΩ MOSFETs - deployed in infotainment USB charging and telematics control units.
For engineers reviewing the LMR33620CQ3RNXTQ1 datasheet, LMR33620CQ3RNXTQ1 pinout, LMR33620CQ3RNXTQ1 application, or LMR33620CQ3RNXTQ1 equivalent, key selection considerations include its 3.3-V fixed output, 2.1-MHz operation for compact filter design, wettable-flank VQFN-12 package for solder inspection, and precision enable with 1.231-V turn-on threshold for reliable cold-crank performance.
Technical Context
This device implements peak-current-mode control with automatic PFM/PWM mode transition to maintain high efficiency across light to full load. It integrates compensation, power-good flag, and precision enable logic - eliminating external loop components and enabling single-resistor UVLO configuration.
The architecture supports ultra-low dropout (68 ns minimum on-time) and features parallel VIN/PGND paths plus HotRod™ packaging to suppress EMI. Thermal shutdown (165°C), hiccup-mode short-circuit protection, and cycle-by-cycle current limiting ensure robustness in automotive environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.8 V to 36 V - supports automotive battery transients including cold-crank (4.5 V) and load-dump (36 V). |
| Output Voltage | Fixed 3.3 V ±1.5% - eliminates feedback resistor network; regulated to ±1.5% over full temperature and load range. |
| Output Current | 2 A continuous - delivers full rated current up to +125°C ambient with proper PCB thermal design. |
| Switching Frequency | 2.1 MHz (±10%) - enables use of small 1–2.2 µH inductors and low-ESR ceramic capacitors for space-constrained layouts. |
| Quiescent Current | 25 µA typical at no load - extends battery life in always-on automotive modules. |
| Shutdown Current | 5 µA maximum - ensures minimal parasitic drain during vehicle sleep mode. |
| Minimum On-Time | 68 ns - enables 3.3 V output regulation from as low as 3.8 V input (VIN/VOUT ≥ 1.15). |
| Power-Good Accuracy | ±2% window (91–106% of VOUT) with 170 µs glitch filter - prevents false resets during transient load steps. |
Pinout & Package
LMR33620CQ3RNXTQ1 uses a 12-pin VQFN (RNX) package measuring 3.0 mm × 2.0 mm × 0.85 mm with wettable flanks for automated optical inspection (AOI) and improved solder joint reliability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 11 | PGND | Power ground return path for high-current switch node; must connect directly to low-inductance ground plane under IC. |
| 2, 10 | VIN | Main input supply rail; requires local 10-µF ceramic capacitor placed adjacent to pins 2 and 10 with short wide traces. |
| 3 | NC | No internal connection; on PCB, tie to SW net to simplify CBOOT routing per TI layout guidance. |
| 4 | BOOT | Bootstrap supply for high-side driver; connect 100-nF capacitor between BOOT and SW (pin 12). |
| 5 | VCC | Internal 5-V LDO output; powers control circuitry; decouple with 1-µF capacitor to AGND - not for external loads. |
| 6 | AGND | Analog reference ground; star-point connection for FB, PG, EN; separate from PGND except at single system ground point. |
| 7 | FB | Feedback input; internally tied to 3.3 V output - connect directly to VOUT near output capacitor; do not float or ground. |
| 8 | PG | Open-drain power-good flag; pulls low during startup, fault, or EN = low; requires external pull-up to VCC or VOUT. |
| 9 | EN | Enable input with 1.231-V rising threshold; connect to VIN or voltage divider for programmable UVLO; must not float. |
| 12 | SW | Switch node; connects to inductor; tie to NC (pin 3) on PCB to reduce trace inductance and improve CBOOT coupling. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C ambient operation - meets automotive electronics reliability and stress testing requirements. |
| Integrated high- and low-side MOSFETs | 75 mΩ HS / 50 mΩ LS RDS(on) - eliminates external FETs and gate drivers, reducing BOM count and layout complexity. |
| Wettable-flank VQFN package | Enables automated optical inspection of solder joints - critical for zero-defect automotive manufacturing yield control. |
| Integrated compensation network | Removes need for external Type-II or Type-III compensation components - accelerates design cycle and improves stability margin. |
| PFM/PWM auto-mode transition | Maintains >85% efficiency at 1-mA load while delivering >95% peak efficiency at full 2-A load - extends battery runtime in standby modes. |
| HotRod™ layout with symmetrical VIN/PGND | Reduces high-frequency EMI by canceling magnetic fields - simplifies EMC compliance in dense infotainment PCBs. |
Applications
| Infotainment USB Charging | Telematics Control Unit (TCU) |
|---|---|
|
Use Scenario: Powering dual-port USB 2.0/3.0 interfaces in head-unit systems requiring stable 3.3 V for USB PHY, hub controller, and data-line termination. IC Role / Device Role / Timing Role: Primary 3.3-V point-of-load regulator supplying clean, low-noise power to USB interface ICs with fast transient response to bus enumeration events. Use Value: 2.1-MHz switching enables <2.2-µH inductors and avoids AM-band interference; 25-µA quiescent current minimizes battery drain during ignition-off states. |
Use Scenario: Providing regulated 3.3 V to cellular modem baseband processors, GNSS receivers, and CAN-FD transceivers in connected vehicle gateways. IC Role / Device Role / Timing Role: Main system rail regulator supporting simultaneous LTE/NB-IoT and GPS signal acquisition with tight output voltage accuracy and low ripple. Use Value: Fixed 3.3-V output eliminates resistor tolerance errors; AEC-Q100 qualification ensures operation during engine cranking (4.5 V) and load dump (36 V). |
| Automotive Instrument Cluster | ADAS Camera Module Power |
|
Use Scenario: Supplying 3.3 V to TFT-LCD timing controllers, touch-screen digitizers, and microcontroller peripherals in digital dashboards. IC Role / Device Role / Timing Role: Secondary rail generator downstream of main 5-V buck, delivering low-noise power with precise enable sequencing for display initialization. Use Value: Precision enable (1.231-V threshold) allows direct connection to MCU GPIO for controlled power-up; PG flag synchronizes firmware boot with rail readiness. |
Use Scenario: Powering image sensor SoCs and ISP processors in rear-view or surround-view cameras where EMI-sensitive analog front-ends coexist with digital logic. IC Role / Device Role / Timing Role: Low-EMI 3.3-V source minimizing switching noise coupling into analog pixel readout paths and clock distribution networks. Use Value: HotRod™ package and symmetrical VIN/PGND routing reduce peak-to-peak noise below 20 mV; 68-ns min on-time supports start-up from weak backup batteries. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR33620CQ5RNXTQ1 | Same package, 2.1 MHz, but fixed 5-V output; identical electrical specs otherwise. | Used where 5-V logic rails (e.g., microcontrollers, CAN transceivers) replace 3.3-V loads. | Select when system requires 5 V instead of 3.3 V - no layout change needed; same footprint and thermal profile. |
| LMR33630CQ3RNXTQ1 | 3-A version with identical 3.3-V fixed output, 2.1-MHz frequency, and VQFN-12 package; higher RDS(on) (65/45 mΩ). | Required for systems scaling beyond 2 A, such as multi-camera ADAS ECUs or high-brightness LED backlight drivers. | Choose for future-proofing or higher current margin; shares same pinout and layout - only inductor and output cap sizing differ. |
Compared with LMR33620CQ3RNXTQ1, the 5-V variant serves different voltage-rail needs without changing board design, while the 3-A version scales current capacity within identical mechanical constraints - both preserve AEC-Q100 Grade 1 qualification and functional safety documentation support.
Availability
LMR33620CQ3RNXTQ1 is available at Aetrix Electronics and suitable for automotive infotainment, telematics control units, and instrument cluster designs requiring stable component supply, long-term lifecycle assurance, and AEC-Q100-compliant sourcing.
Supply support for LMR33620CQ3RNXTQ1 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 ICs, with decades of automotive qualification expertise and functional safety infrastructure.
The LMR336xx-Q1 product line delivers compact, high-efficiency synchronous buck regulators optimized for automotive subsystems - designed to replace discrete DC/DC solutions in infotainment, ADAS, and body electronics with minimal external components.
FAQ
What is the output voltage tolerance of the LMR33620CQ3RNXTQ1 over temperature and load?
The LMR33620CQ3RNXTQ1 delivers 3.3 V output with ±1.5% regulation over –40°C to +125°C junction temperature and 0–2 A load range, as specified in Section 6.7 of the datasheet. This tolerance holds for input voltages from 3.8 V to 36 V and includes line, load, and temperature effects - verified via production testing and statistical correlation.
Does the LMR33620CQ3RNXTQ1 require external compensation components?
No, the LMR33620CQ3RNXTQ1 integrates a complete Type-II compensation network internally. This eliminates external resistors and capacitors typically needed for loop stability, reducing solution size and simplifying design validation - confirmed in Section 7.3.4 and Figure 8-1 of the datasheet.
Can the LMR33620CQ3RNXTQ1 operate during automotive cold-crank conditions?
Yes, the LMR33620CQ3RNXTQ1 operates down to 3.8 V input, supporting cold-crank events where battery voltage dips to ~4.5 V. Its 68-ns minimum on-time enables regulation of 3.3 V output even at VIN = 3.8 V (VIN/VOUT ratio ≈ 1.15), as detailed in Section 7.1 and Figure 6-6 of the datasheet.
What is the purpose of the NC pin (Pin 3) on the LMR33620CQ3RNXTQ1?
Pin 3 is a no-connect terminal with no internal bond wire. Per TI layout guidelines, it must be connected to the SW net on the PCB to shorten the CBOOT capacitor routing path and minimize parasitic inductance - improving bootstrap capacitor effectiveness and high-side gate drive integrity.
How does the power-good (PG) flag behave during startup and fault conditions?
The LMR33620CQ3RNXTQ1 PG pin remains low for ~4 ms after EN assertion, then transitions high when VOUT reaches 91–97% of 3.3 V. It pulls low during undervoltage, overcurrent, thermal shutdown, or EN deactivation - with a 170-µs glitch filter preventing false triggers from transient load steps, as defined in Section 6.5.
LMR33620CQ3RNXTQ1 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):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 2A
- Frequency - Switching:
- 2.1MHz
- 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)
LMR33620CQ3RNXTQ1 FAQ
1.How can I place an order for LMR33620CQ3RNXTQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR33620CQ3RNXTQ1 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 LMR33620CQ3RNXTQ1 reliable?
The price and inventory of LMR33620CQ3RNXTQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR33620CQ3RNXTQ1 is usually 5 days.
3.What payment methods are accepted for LMR33620CQ3RNXTQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR33620CQ3RNXTQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR33620CQ3RNXTQ1?
LMR33620CQ3RNXTQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR33620CQ3RNXTQ1 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 LMR33620CQ3RNXTQ1?
For technical support, including LMR33620CQ3RNXTQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR33620CQ3RNXTQ1 requirements.
6.How does Aetrix verify that LMR33620CQ3RNXTQ1 is sourced from the original manufacturer or authorized distributors?
All LMR33620CQ3RNXTQ1 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 LMR33620CQ3RNXTQ1 meets industry standards.
7.What is the process for return or replacement of LMR33620CQ3RNXTQ1?
All LMR33620CQ3RNXTQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMR33620CQ3RNXTQ1, 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 LMR33620CQ3RNXTQ1 part is unused and in its original packaging.
Return procedure for LMR33620CQ3RNXTQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMR33620CQ3RNXTQ1 Tags
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