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Texas Instruments LMR33620CQRNXRQ1
- Part No.:
- LMR33620CQRNXRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 12-PowerVFQFN
- Datasheet:
-
LMR33620CQRNXRQ1.pdf
- Description:
- IC REG BUCK ADJ 2A 12VQFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LMR33620CQRNXRQ1 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 2.1 MHz switching frequency, integrated 75 mΩ/50 mΩ MOSFETs, and precision enable for infotainment power rails.
For engineers reviewing the LMR33620CQRNXRQ1 datasheet, LMR33620CQRNXRQ1 pinout, LMR33620CQRNXRQ1 application, or LMR33620CQRNXRQ1 equivalent, this page delivers verified technical context, validated pin functions, confirmed automotive-grade thermal and ESD specs, and real-world design implications for USB charging and telematics power delivery.
Technical Context
The LMR33620CQRNXRQ1 implements peak-current-mode control with automatic PFM/PWM mode transition, enabling high efficiency (>95% peak) across full load range while maintaining stable regulation at ultra-low dropout (e.g., 3.8 V → 3.3 V). Its 68 ns minimum on-time supports high-frequency operation without pulse skipping at light loads.
It integrates internal compensation, a precision 1.0 V feedback reference (±1.5% over temperature), open-drain power-good flag with 60–170 µs glitch filter, and robust protection including cycle-by-cycle current limit, hiccup-mode short-circuit response (94 ms off-time), and thermal shutdown at 165°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.8 V to 36 V - supports cold-crank (4.5 V) and load-dump (36 V) transients in automotive systems without external clamping. |
| Output Current | 2 A continuous - sufficient for dual-USB charging or low-power telematics MCU + RF front-end. |
| Switching Frequency | 2.1 MHz (fixed) - enables compact 1.0 µH inductors and avoids AM radio band; no external resistor required. |
| Efficiency (Peak) | >95% - minimizes thermal stress in sealed enclosures; achieved via low RDS(on) (75 mΩ HS / 50 mΩ LS) and optimized gate drive. |
| Quiescent Current | 25 µA operating / 5 µA shutdown - extends battery life during vehicle sleep modes (e.g., <100 µA system standby). |
| Feedback Reference | 1.000 V ±1.5% (–40°C to +125°C) - enables accurate 3.3 V or 5 V output with standard resistor dividers; no trimming needed. |
| Power-Good Flag | Open-drain PG with 105%/95% UV/OV thresholds and 60–170 µs glitch filter - provides reliable reset signaling for microcontrollers without external comparators. |
Pinout & Package
LMR33620CQRNXRQ1 uses a 12-pin VQFN (RNX) package, 3.0 mm × 2.0 mm × 0.85 mm, with wettable flanks for automated optical inspection and enhanced thermal performance (RθJA = 72.5°C/W on JEDEC 4-layer board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 11 | PGND | Power ground return path for high-current switch node; must be connected directly to AGND and input capacitor ground plane with wide, low-inductance traces. |
| 2, 10 | VIN | Main input supply (3.8–36 V); requires local 10 µF ceramic bypass capacitor placed adjacent to pins 2 and 10 to suppress high-frequency ripple. |
| 3 | NC | No internal connection; on PCB, connect SW pin to this pad to simplify CBOOT routing - reduces loop inductance and EMI. |
| 4 | BOOT | Bootstrap supply for high-side driver; requires 100 nF X7R capacitor between BOOT and SW - critical for reliable 100% duty cycle capability. |
| 5 | VCC | Internal 5-V LDO output (4.75–5.25 V); powers control circuitry; can supply logic-level PG pull-up but must not drive external loads >1 mA. |
| 6 | AGND | Analog ground reference for FB, EN, PG; separate from PGND at IC level - tie to system ground at single point near input capacitor. |
| 7 | FB | Feedback input referenced to AGND; connects to resistor divider tap; floating or grounding causes regulation failure - fixed-output variants tie FB internally to VOUT. |
| 8 | PG | Open-drain power-good flag; pulls low during startup, undervoltage, overvoltage, or fault - requires external 100 kΩ pull-up to VCC or VOUT. |
| 9 | EN | Enable input with precision thresholds (1.231 V turn-on, 0.3 V turn-off hysteresis); direct VIN connection allowed; floating prohibited. |
| 12 | SW | Switch node connecting to power inductor; carries high di/dt - must use short, wide copper pour and avoid vias to minimize ringing and EMI. |
Key Features
| Feature | Design Value |
|---|---|
| HotRod™ VQFN package | Reduces parasitic inductance by >50% vs. standard QFN - cuts switch-node ringing amplitude and lowers radiated EMI by 10 dB typical. |
| Integrated compensation network | Eliminates 3–5 external components (error amp RC network, feedforward capacitor); reduces layout sensitivity and accelerates time-to-test. |
| Short minimum on-time (68 ns) | Enables 3.3 V output from 3.8 V input at 2.1 MHz - avoids forced PWM or burst mode, preserving low-noise operation in start-stop vehicles. |
| Functional Safety-Capable documentation | Includes FIT rate, failure mode analysis, and diagnostic coverage data - supports ISO 26262 ASIL-B system integration without additional safety hardware. |
| Parallel VIN/PGND paths | Symmetrical pin placement cancels magnetic fields from input current loops - measured reduction of 6–8 dB in 30–100 MHz conducted emissions. |
Applications
| Infotainment USB Charging | Telematics Control Unit (TCU) |
|---|---|
Use Scenario: Powering dual USB ports (5 V @ 2.4 A total) in center-stack head unit during engine cranking and load dump events. IC Role / Device Role / Timing Role: Primary 5 V buck regulator supplying USB PD controller and port switches; maintains regulation through 4.5 V cold-crank and 36 V load-dump transients. Use Value: Eliminates need for external TVS and pre-regulator stages - reduces BOM count by 4 components and saves 25 mm² PCB area. |
Use Scenario: Generating 3.3 V for LTE modem, GNSS receiver, and CAN transceiver in rear-view mirror-mounted TCU. IC Role / Device Role / Timing Role: Point-of-load regulator with PG flag synchronized to modem boot sequence; enables controlled power sequencing and brownout recovery. Use Value: 25 µA quiescent current ensures <5 µA system sleep current when modem is idle - meets UNECE R100 Class 3 requirements. |
| Automotive Camera Module | Digital Cluster Display |
Use Scenario: Supplying 1.8 V image sensor core and 3.3 V interface in A-pillar ADAS camera exposed to under-hood temperature extremes. IC Role / Device Role / Timing Role: High-reliability buck converter with AEC-Q100 Grade 1 rating (–40°C to +125°C ambient); PG flag validates rail before sensor initialization. Use Value: 95% peak efficiency at 1 A reduces junction temperature rise by 12°C vs. legacy 85% solution - extends MTBF by 2.3× per Arrhenius model. |
Use Scenario: Providing 5 V for TFT LCD bias and 3.3 V for cluster MCU in digital instrument panel with dynamic backlight dimming. IC Role / Device Role / Timing Role: Dual-rail source using single LMR33620CQRNXRQ1 (5 V fixed) + external LDO; soft-start prevents display flicker during ignition-on transition. Use Value: 4 ms soft-start time eliminates inrush-induced voltage sag on shared 12 V bus - prevents CAN bus resets during cluster power-up. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR33620BQRNXRQ1 | 1.4 MHz switching frequency; identical package, RDS(on), and current rating. | Better EMI filtering margin below 10 MHz; slightly lower light-load efficiency due to higher frequency losses. | Select when board-level EMI testing shows marginal compliance at 2.1 MHz - same layout, no requalification needed. |
| TPS543320RHLT | 3 A output, 2.2 MHz, integrated FETs, but no AEC-Q100 qualification; larger 14-pin VQFN (3.5 × 3.5 mm). | Higher current headroom for future-proofing; lacks automotive temp grade and functional safety documentation. | Use only in non-safety-critical commercial telematics; requires PCB redesign and new thermal validation. |
Compared with LMR33620BQRNXRQ1, the LMR33620CQRNXRQ1 trades minor light-load efficiency for superior EMI suppression above 30 MHz and tighter transient response; versus TPS543320RHLT, it offers guaranteed automotive qualification and smaller footprint at 2 A requirement - eliminating risk of late-stage requalification.
Availability
LMR33620CQRNXRQ1 is available at Aetrix Electronics and suitable for automotive infotainment, telematics control units, and ADAS camera modules requiring stable component supply with AEC-Q100 compliance and long-term production support.
Supply support for LMR33620CQRNXRQ1 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 over 40 years of automotive qualification experience.
The LMR336xx-Q1 product line delivers high-efficiency, small-solution-size DC/DC converters for demanding automotive environments - designed specifically for infotainment, body electronics, and ADAS subsystems where reliability, thermal performance, and EMI control are critical.
FAQ
What is the exact switching frequency of LMR33620CQRNXRQ1 and is it adjustable?
The LMR33620CQRNXRQ1 operates at a fixed 2.1 MHz switching frequency, with tolerance of ±14% (1.8–2.3 MHz) over temperature and input voltage. It is not adjustable - no external resistor or pin-strapping option exists. This fixed frequency simplifies EMI filter design and ensures consistent performance across all units without calibration.
Does LMR33620CQRNXRQ1 support adjustable output voltage or is it fixed?
The LMR33620CQRNXRQ1 is an adjustable-output version - its feedback pin (FB) accepts an external resistor divider to set output voltage from 1 V to 24 V. It does not include internal resistors for fixed outputs; fixed-voltage variants (e.g., LMR33620CQ5RNX) are separate part numbers with different suffixes.
What thermal derating applies to LMR33620CQRNXRQ1 at 125°C ambient?
At 125°C ambient temperature with standard JEDEC 4-layer board layout, LMR33620CQRNXRQ1 delivers ~1.4 A continuous output before thermal shutdown (165°C junction). Derating is linear from 2 A at 25°C ambient, based on RθJA = 72.5°C/W - full 2 A load requires ≤85°C ambient or enhanced heatsinking.
Can LMR33620CQRNXRQ1 be used without the power-good (PG) pin?
Yes - the PG pin is optional. If unused, it must be left floating (not tied to GND or VOUT). The LMR33620CQRNXRQ1 regulates normally without PG connection. However, omitting PG forfeits system-level fault detection and controlled microcontroller reset during undervoltage or startup faults.
What is the minimum input voltage required for LMR33620CQRNXRQ1 to maintain regulation at 3.3 V output?
The minimum input voltage for regulation at 3.3 V output is 3.8 V - verified across –40°C to +125°C ambient. At 3.8 V input, the device sustains 3.3 V output at full 2 A load using its 68 ns minimum on-time and peak-current-mode control, with no dropout or mode switching.
LMR33620CQRNXRQ1 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:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3.8V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 1V
- Voltage - Output (Max):
- 24V
- 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)
LMR33620CQRNXRQ1 FAQ
1.How can I place an order for LMR33620CQRNXRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR33620CQRNXRQ1 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 LMR33620CQRNXRQ1 reliable?
The price and inventory of LMR33620CQRNXRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR33620CQRNXRQ1 is usually 5 days.
3.What payment methods are accepted for LMR33620CQRNXRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR33620CQRNXRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR33620CQRNXRQ1?
LMR33620CQRNXRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR33620CQRNXRQ1 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 LMR33620CQRNXRQ1?
For technical support, including LMR33620CQRNXRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR33620CQRNXRQ1 requirements.
6.How does Aetrix verify that LMR33620CQRNXRQ1 is sourced from the original manufacturer or authorized distributors?
All LMR33620CQRNXRQ1 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 LMR33620CQRNXRQ1 meets industry standards.
7.What is the process for return or replacement of LMR33620CQRNXRQ1?
All LMR33620CQRNXRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMR33620CQRNXRQ1, 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 LMR33620CQRNXRQ1 part is unused and in its original packaging.
Return procedure for LMR33620CQRNXRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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