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Texas Instruments LMR33620CQ3RNXRQ1
- Part No.:
- LMR33620CQ3RNXRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 12-PowerVFQFN
- Datasheet:
-
LMR33620CQ3RNXRQ1.pdf
- Description:
- IC REG BUCK 3.3V 2A 12VQFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LMR33620CQ3RNXRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive-qualified synchronous step-down DC/DC converter delivering 2 A output current with fixed 3.3-V output, 3.8–36-V input range, 2.1-MHz switching frequency, and peak efficiency >95%. It integrates high-side (75-mΩ) and low-side (50-mΩ) MOSFETs and operates in PFM/PWM hybrid mode for high light-load efficiency in infotainment power rails.
For engineers reviewing the LMR33620CQ3RNXRQ1 datasheet, LMR33620CQ3RNXRQ1 pinout, LMR33620CQ3RNXRQ1 application, or LMR33620CQ3RNXRQ1 equivalent, key selection criteria include its fixed 3.3-V output, 2.1-MHz operation enabling compact filter design, wettable-flank VQFN-12 package for automotive-grade solder joint inspection, precision enable thresholds (1.231 V typ), and integrated power-good flag with glitch filtering.
Technical Context
The LMR33620CQ3RNXRQ1 implements peak-current-mode control with automatic PFM/PWM transition to maintain high efficiency across 0–2 A load range. Its 68-ns minimum on-time supports high VIN-to-VOUT ratios (e.g., 12 V → 3.3 V at 2.1 MHz), while integrated compensation eliminates external loop components.
It features a precision enable input with 100-mV hysteresis, open-drain power-good flag with 60–170-µs glitch filter, thermal shutdown (165°C), cycle-by-cycle current limit, and hiccup-mode short-circuit protection. The device uses internal 5-V LDO (VCC) for bias and supports boot-strapped high-side drive via dedicated BOOT/SW pins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.8 V to 36 V - Supports full automotive battery range including cold-crank (6 V) and load-dump (36 V) transients. |
| Output Voltage | Fixed 3.3 V ±1.5% - Internally trimmed; no external feedback resistors required; FB pin connected directly to VOUT. |
| Switching Frequency | 2.1 MHz (±0.3 MHz) - Enables use of small 1-µH inductors and ceramic output capacitors; reduces EMI through spread-spectrum-capable architecture. |
| Output Current | 2 A continuous - Delivered with thermal derating per RθJA = 72.5°C/W; supported by integrated 75-mΩ/50-mΩ MOSFETs. |
| Quiescent Current | 25 µA typical - Enables always-on systems (e.g., telematics wake-up circuits) without excessive battery drain. |
| Shutdown Current | 5 µA maximum - Meets automotive low-power standby requirements when EN = 0 V. |
| Power-Good Accuracy | ±3% window around 3.3 V (90–110% FB threshold) - Provides reliable system reset signaling with 60–170-µs glitch immunity. |
Pinout & Package
The LMR33620CQ3RNXRQ1 is housed in a 12-pin VQFN package (3.0 mm × 2.0 mm × 0.85 mm) with wettable flanks for automated optical inspection (AOI) of solder joints in automotive PCB assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 11 PGND | Power ground | Primary return path for high-current switch node; must be connected to AGND and input capacitor ground with wide, low-inductance traces. |
| 2, 10 VIN | Main input supply | Accepts 3.8–36 V; requires local 10-µF ceramic bypass capacitor directly between VIN and PGND pins. |
| 3 NC | No connect | Internally unconnected; on PCB, tie to SW net to simplify CBOOT routing in VQFN layout. |
| 4 BOOT | Bootstrap supply | Drives high-side MOSFET gate; requires 100-nF ceramic capacitor between BOOT and SW pins. |
| 5 VCC | Internal 5-V LDO output | Supplies internal logic; not for external loads; requires 1-µF bypass capacitor to AGND. |
| 6 AGND | Analog ground reference | Reference for FB, EN, PG, and internal error amplifier; must be star-connected to PGND at single point near IC. |
| 7 FB | Feedback input | Connected internally to fixed 3.3-V reference; externally tied directly to VOUT near output capacitor for regulation accuracy. |
| 8 PG | Open-drain power-good flag | Asserts high when VOUT is within ±3%; requires external pull-up resistor (e.g., to VCC or VOUT); pulls low during faults or EN = 0. |
| 9 EN | Enable control | Active-high with precision thresholds (1.231 V typ enable, 0.3 V hysteresis); can be tied to VIN if UVLO not needed. |
| 12 SW | Switch node | Connects to power inductor; high dv/dt node requiring tight layout; routed adjacent to NC pin (pin 3) to minimize loop area. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Rated for –40°C to +125°C ambient operation - Validated for under-hood automotive environments with extended temperature cycling and humidity testing. |
| Integrated high- and low-side MOSFETs | 75-mΩ HS / 50-mΩ LS RDS(on) - Eliminates external FETs and drivers; reduces BOM count and layout complexity in space-constrained modules. |
| HotRod™ VQFN package with wettable flanks | Low parasitic inductance and symmetrical VIN/PGND pin layout - Minimizes switch-node ringing, enables <10-mm² solution size, and supports automated solder-joint inspection. |
| PFM/PWM hybrid mode | Automatic transition below ~200 mA load - Maintains >85% efficiency at 1-mA load while preserving 95%+ peak efficiency at full 2-A load. |
| Integrated soft-start and compensation | 4-ms internal soft-start time and fully compensated loop - Prevents output overshoot and eliminates need for external compensation network or SS capacitor. |
Applications
| Infotainment USB Power Rail | Telematics Control Unit (TCU) Core Supply |
|---|---|
Use Scenario: Powers USB Type-C ports and display controllers in automotive head units where input voltage varies from 6 V (cold crank) to 16 V (normal operation). IC Role / Device Role / Timing Role: Primary 3.3-V buck regulator supplying SoC I/O, USB PHY, and touch controller logic rails. Use Value: Fixed 3.3-V output eliminates feedback resistor errors; 2.1-MHz switching allows <10-mm² total solution size; PG flag synchronizes USB enumeration with stable rail. |
Use Scenario: Supplies 3.3-V core voltage to cellular modem, GNSS receiver, and CAN interface in vehicle-to-cloud communication modules. IC Role / Device Role / Timing Role: Always-on power stage supporting low-power sleep modes and fast wake-up response for OTA updates. Use Value: 25-µA quiescent current extends battery backup runtime; AEC-Q100 qualification ensures reliability over 15-year vehicle lifecycle; wettable flanks guarantee solder joint integrity in vibration-prone mounting locations. |
| Automotive Cluster Display Backlight Driver Bias | ADAS Camera Module Power Sequencing |
Use Scenario: Generates clean 3.3-V bias for LED driver ICs and display timing controllers in digital instrument clusters exposed to wide temperature swings. IC Role / Device Role / Timing Role: Secondary regulated supply derived from main 12-V battery rail; interfaces with display power management IC via PG signal. Use Value: High PSRR and low output noise (<10 mVpp) prevent visible flicker in TFT displays; thermal shutdown (165°C) protects against enclosed enclosure overheating. |
Use Scenario: Provides controlled 3.3-V startup sequence for image sensor, ISP, and MIPI interface in surround-view camera ECUs. IC Role / Device Role / Timing Role: First-stage regulator enabling precise power sequencing with PG flag triggering downstream LDOs and sensor initialization. Use Value: 4-ms soft-start prevents inrush current damage to sensitive CMOS image sensors; precision enable thresholds allow synchronized wake-up with vehicle CAN bus activity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR33620BQRNX | 1.4-MHz switching frequency; same 3.3-V fixed output, VQFN-12 package, and AEC-Q100 Grade 1 rating. | Lower frequency increases inductor size but reduces EMI sensitivity in noise-critical zones (e.g., near RF receivers). | Select when board layout constraints favor larger magnetics or when EMI compliance testing shows marginal margin at 2.1 MHz. |
| TPS62933QPWRQ1 | 3-V to 18-V input, 3.3-V fixed output, 3-A rating, 2.25-MHz operation, and higher efficiency (>96%) but no integrated PG flag. | Lacks power-good output; requires external monitoring circuitry for system reset coordination. | Choose when higher current headroom (3 A vs. 2 A) and tighter output tolerance (±0.5%) are prioritized over integrated fault signaling. |
Compared with LMR33620CQ3RNXRQ1, the LMR33620BQRNX offers lower-frequency operation for relaxed EMI filtering, while the TPS62933QPWRQ1 delivers higher current and efficiency but removes the integrated power-good function-requiring additional discrete supervision for safety-critical sequencing.
Availability
LMR33620CQ3RNXRQ1 is available at Aetrix Electronics and suitable for automotive infotainment systems, telematics control units, and ADAS camera modules requiring stable component supply, AEC-Q100 compliance, and long-term production continuity.
Supply support for LMR33620CQ3RNXRQ1 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 decades of automotive qualification expertise.
The LMR33620-Q1 product line delivers compact, high-efficiency synchronous buck regulators optimized for automotive subsystems demanding AEC-Q100 Grade 1 reliability, functional safety readiness, and minimal external component count.
FAQ
What is the exact output voltage tolerance of the LMR33620CQ3RNXRQ1 under full load and temperature range?
The LMR33620CQ3RNXRQ1 provides a fixed 3.3-V output with ±1.5% regulation tolerance across –40°C to +125°C junction temperature and 0–2 A load range, as specified in Section 6.7 of the datasheet. This includes line, load, and temperature variation; measured at the FB pin, which is internally connected to the 3.3-V reference.
Does the LMR33620CQ3RNXRQ1 require external compensation components?
No, the LMR33620CQ3RNXRQ1 integrates full loop compensation, eliminating the need for external Type-II or Type-III compensation networks. This simplifies design, reduces BOM cost, and improves stability across all operating conditions without requiring tuning.
Can the LMR33620CQ3RNXRQ1 operate with an input voltage as low as 3.8 V while delivering 3.3 V at 2 A?
Yes, the LMR33620CQ3RNXRQ1 supports dropout operation down to 3.8 V input while maintaining 3.3-V output at full 2-A load, enabled by its 98% maximum duty cycle and 68-ns minimum on-time. In this condition, switching frequency drops dynamically to sustain regulation.
How is the power-good (PG) flag of the LMR33620CQ3RNXRQ1 configured for a fixed 3.3-V output?
For the LMR33620CQ3RNXRQ1, the PG flag asserts high when output voltage reaches 91–97% of nominal (3.3 V) on rising edge and deasserts low below 89–95% on falling edge, with 60–170-µs glitch filtering. No external resistor divider is needed-the internal thresholds scale directly to the fixed 3.3-V reference.
What thermal performance can be expected from the LMR33620CQ3RNXRQ1 in a standard 4-layer automotive PCB?
In a JEDEC-standard 4-layer board, the LMR33620CQ3RNXRQ1 exhibits a junction-to-ambient thermal resistance (RθJA) of 72.5°C/W. At 2-A load and 12-V input, typical power dissipation is ~280 mW, resulting in ~20°C junction-to-ambient rise-well within the –40°C to +125°C operating range.
LMR33620CQ3RNXRQ1 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)
LMR33620CQ3RNXRQ1 FAQ
1.How can I place an order for LMR33620CQ3RNXRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR33620CQ3RNXRQ1 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 LMR33620CQ3RNXRQ1 reliable?
The price and inventory of LMR33620CQ3RNXRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR33620CQ3RNXRQ1 is usually 5 days.
3.What payment methods are accepted for LMR33620CQ3RNXRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR33620CQ3RNXRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR33620CQ3RNXRQ1?
LMR33620CQ3RNXRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR33620CQ3RNXRQ1 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 LMR33620CQ3RNXRQ1?
For technical support, including LMR33620CQ3RNXRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR33620CQ3RNXRQ1 requirements.
6.How does Aetrix verify that LMR33620CQ3RNXRQ1 is sourced from the original manufacturer or authorized distributors?
All LMR33620CQ3RNXRQ1 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 LMR33620CQ3RNXRQ1 meets industry standards.
7.What is the process for return or replacement of LMR33620CQ3RNXRQ1?
All LMR33620CQ3RNXRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMR33620CQ3RNXRQ1, 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 LMR33620CQ3RNXRQ1 part is unused and in its original packaging.
Return procedure for LMR33620CQ3RNXRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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