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Texas Instruments LMR33620APCQRNXRQ1
- Part No.:
- LMR33620APCQRNXRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 12-PowerVFQFN
- Datasheet:
-
LMR33620APCQRNXRQ1.pdf
- Description:
- IC REG BUCK ADJ 2A 12VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:9,000
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Product details
Overview
LMR33620APCQRNXRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous step-down DC/DC converter delivering up to 2 A output current from a 3.8 V–36 V input, with adjustable 1 V–24 V output voltage, 2.1 MHz switching frequency, and 95% peak efficiency - used in infotainment power rails requiring high light-load efficiency and compact layout.
For engineers reviewing the LMR33620APCQRNXRQ1 datasheet, LMR33620APCQRNXRQ1 pinout, LMR33620APCQRNXRQ1 application, or LMR33620APCQRNXRQ1 equivalent, key selection criteria include its 68 ns minimum on-time, integrated compensation, wettable-flank VQFN-12 package, precision enable threshold (1.231 V typ), and power-good flag with glitch filtering for system reset coordination.
Technical Context
The LMR33620APCQRNXRQ1 implements peak-current-mode control with automatic PFM/PWM mode transition to maintain high efficiency across load range. Its 2.1 MHz fixed-frequency operation enables ultra-small external inductors and capacitors while supporting wide VIN-to-VOUT ratios - including regulation from 3.8 V input to 3.3 V output.
It integrates 75 mΩ high-side and 50 mΩ low-side MOSFETs, features internal loop compensation, and includes robust protection: cycle-by-cycle current limit, hiccup-mode short-circuit response (94 ms off-time), thermal shutdown at 165°C, and input UVLO tied to internal 5-V LDO (VCC).
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 (4.5 V) and load-dump (36 V) transients |
| Output Current | 2 A continuous - sufficient for powering SoCs, display controllers, and audio amplifiers in cluster systems |
| Switching Frequency | 2.1 MHz - enables use of ≤1 µH inductors and reduces EMI filter size for space-constrained PCBs |
| Min On-Time | 68 ns - allows high step-down ratio (e.g., 12 V → 1.2 V) without pulse-skipping at high frequency |
| Quiescent Current | 25 µA operating / 5 µA shutdown - extends battery life in always-on telematics modules |
| Feedback Reference | 1.0 V ±1.5% - enables precise output regulation with standard resistor-divider networks |
| Power-Good Flag | Open-drain PG with 105–110% rising threshold and 60–170 µs glitch filter - provides reliable system reset signaling |
Pinout & Package
The LMR33620APCQRNXRQ1 uses a 12-pin VQFN (RNX) package measuring 3.0 mm × 2.0 mm × 0.85 mm with wettable flanks for automated optical inspection and improved solder joint reliability.
| 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 bypass capacitor with short, wide traces |
| 2, 10 VIN | Main input supply | Accepts 3.8–36 V; requires local ceramic bypass capacitor directly to PGND for stable high-frequency operation |
| 3 NC | No-connect | Internally unconnected; on PCB, tie SW pin to this pad 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 | Powers internal logic; not for external loads; requires 1 µF decoupling to AGND |
| 6 AGND | Analog ground reference | Reference for FB, EN, PG; must be star-connected to PGND at single point to minimize noise coupling |
| 7 FB | Feedback input | Monitors output via resistor divider; 1.0 V reference enables accurate adjustable output voltage setting |
| 8 PG | Power-good flag | Open-drain output indicating regulation status; requires external pull-up to VCC or VOUT (100 kΩ typical) |
| 9 EN | Enable control | Logic-level input with 1.231 V typical turn-on threshold; supports precision UVLO via external resistor divider |
| 12 SW | Switch node | Connects to power inductor; high dv/dt node requiring tight layout and minimal trace area to reduce EMI |
Key Features
| Feature | Design Value |
|---|---|
| HotRod™ VQFN package | Reduces parasitic inductance and EMI by symmetrical VIN/PGND pin placement and optimized internal power routing |
| Integrated compensation network | Eliminates need for external Type-II/III compensation components, reducing BOM count and design iteration time |
| Auto PFM/PWM mode transition | Maintains >90% efficiency down to 1 mA load without external control, critical for low-power sleep states |
| Functional safety documentation support | Includes FIT rate data, failure mode analysis, and diagnostic coverage guidance for ISO 26262 ASIL-B system integration |
| Hiccup-mode short-circuit protection | Limits average power dissipation during sustained faults, preventing thermal runaway and enabling safe auto-recovery |
Applications
| Infotainment Power Supply | Instrument Cluster Core Rail |
|---|---|
Use Scenario: Powers application processor, GPU, and display interface in head-unit systems with variable load profiles and strict EMI limits. IC Role / Device Role / Timing Role: Primary 3.3-V or 5-V buck regulator supplying core logic voltage with fast transient response and low-noise operation. Use Value: 2.1 MHz switching enables small 1.0 µH inductor and <10 µF output capacitance, reducing solution footprint by >40% vs. 400 kHz alternatives. | Use Scenario: Delivers stable 1.2-V or 1.8-V rail to microcontroller and CAN transceiver in digital instrument clusters exposed to wide temperature swings. IC Role / Device Role / Timing Role: High-reliability point-of-load regulator with AEC-Q100 Grade 1 qualification and thermal shutdown at 165°C. Use Value: 25 µA quiescent current and 5 µA shutdown current meet OEM requirements for <100 µA system standby consumption. |
| Telematics Control Unit (TCU) | ADAS Camera Module Power |
Use Scenario: Supplies 1.1-V core and 1.8-V I/O rails to LTE/Wi-Fi SoC in always-connected vehicle communication modules. IC Role / Device Role / Timing Role: Dual-rail capable buck converter with independent enable and power-good signaling for sequenced startup. Use Value: Precision enable threshold (±10 mV) and PG glitch filter (60–170 µs) ensure deterministic boot timing and fault isolation in multi-rail systems. | Use Scenario: Provides clean, low-noise 2.8-V bias to CMOS image sensor in rear-view or surround-view cameras operating at –40°C to +125°C. IC Role / Device Role / Timing Role: Compact, high-efficiency buck regulator with low EMI HotRod packaging to avoid interference with analog video signals. Use Value: Wettable-flank VQFN-12 enables AOI-compatible assembly and improves thermal resistance (RθJB = 23.3°C/W) for passive cooling in sealed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR33620APAQRNXRQ1 | Same silicon, 400 kHz switching frequency instead of 2.1 MHz; higher minimum on-time (120 ns) | Better suited for higher-output-voltage designs (e.g., 12 V out) where EMI filtering is prioritized over size | Select when board space permits larger inductors and lower-frequency operation simplifies EMI compliance testing |
| TPS543320RTWR | 3-A rating, 2.2-MHz operation, but requires external compensation and lacks AEC-Q100 qualification | Targeted at industrial/commercial servers, not automotive; no functional safety documentation | Consider only for non-automotive designs needing higher current or different feature trade-offs |
Compared with LMR33620APAQRNXRQ1, the LMR33620APCQRNXRQ1 delivers smaller magnetics and tighter layout due to 2.1 MHz operation, while versus TPS543320RTWR it provides automotive qualification, integrated compensation, and functional safety support - making it the sole qualified choice for ASIL-B power rails.
Availability
LMR33620APCQRNXRQ1 is available at Aetrix Electronics and suitable for infotainment systems, instrument clusters, telematics control units, and ADAS camera modules requiring stable component supply and long-term automotive-grade availability.
Supply support for LMR33620APCQRNXRQ1 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 company specializing in analog and embedded processing technologies, with leadership in power management ICs for automotive, industrial, and personal electronics.
The LMR336x0AP-Q1 product line was designed specifically for rugged automotive subsystems requiring high efficiency, small solution size, and AEC-Q100 compliance - targeting infotainment, cluster, and telematics applications.
FAQ
What is the maximum input voltage rating for the LMR33620APCQRNXRQ1?
The LMR33620APCQRNXRQ1 has an absolute maximum input voltage rating of 38 V, with recommended operating range from 3.8 V to 36 V. This supports full automotive battery conditions including cold-crank (down to ~4.5 V) and load-dump transients (up to 36 V). Operation beyond 36 V is not recommended for long-term reliability, and the device includes input UVLO tied to its internal VCC LDO to prevent malfunction during brownout.
Does the LMR33620APCQRNXRQ1 require external compensation components?
No, the LMR33620APCQRNXRQ1 integrates a complete Type-II compensation network internally. This eliminates the need for external resistors and capacitors typically required for loop stability in voltage-mode or current-mode buck regulators. The integrated compensation enables immediate use with only input/output capacitors, inductor, and feedback resistors - reducing BOM count and simplifying layout for automotive designers.
How does the power-good (PG) flag behave during startup and fault conditions for the LMR33620APCQRNXRQ1?
The LMR33620APCQRNXRQ1 PG pin is an open-drain output that remains low for ~4 ms after EN assertion, then goes high when output reaches 95% of target. It pulls low during undervoltage (FB < 90% ref), overcurrent, thermal shutdown, or EN deactivation. A built-in 60–170 µs glitch filter prevents false triggering during transient load steps. External pull-up to VCC or VOUT (via 100 kΩ) is required; floating PG is not allowed.
What package type and dimensions does the LMR33620APCQRNXRQ1 use?
The LMR33620APCQRNXRQ1 uses a 12-pin VQFN package designated RNX, with nominal body size 3.0 mm × 2.0 mm × 0.85 mm and wettable flanks. The package features symmetrical VIN/PGND pin placement to cancel magnetic fields and reduce EMI. Its HotRod™ construction minimizes bond-wire inductance, enabling clean switch-node waveforms and simplified PCB layout for automotive EMI compliance.
Can the LMR33620APCQRNXRQ1 operate with an input voltage as low as 3.8 V while regulating a 3.3-V output?
Yes, the LMR33620APCQRNXRQ1 is specifically designed to regulate a 3.3-V output from a 3.8-V input using its 68 ns minimum on-time and peak-current-mode architecture. At 2.1 MHz, the required duty cycle is ~83%, well within the device's 98% maximum achievable duty cycle. This capability enables operation during deep automotive battery discharge while maintaining regulation - verified in TI's typical characteristics (Figure 7-6, IPEAK-MIN).
LMR33620APCQRNXRQ1 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)
LMR33620APCQRNXRQ1 FAQ
1.How can I place an order for LMR33620APCQRNXRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR33620APCQRNXRQ1 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 LMR33620APCQRNXRQ1 reliable?
The price and inventory of LMR33620APCQRNXRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR33620APCQRNXRQ1 is usually 5 days.
3.What payment methods are accepted for LMR33620APCQRNXRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR33620APCQRNXRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR33620APCQRNXRQ1?
LMR33620APCQRNXRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR33620APCQRNXRQ1 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 LMR33620APCQRNXRQ1?
For technical support, including LMR33620APCQRNXRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR33620APCQRNXRQ1 requirements.
6.How does Aetrix verify that LMR33620APCQRNXRQ1 is sourced from the original manufacturer or authorized distributors?
All LMR33620APCQRNXRQ1 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 LMR33620APCQRNXRQ1 meets industry standards.
7.What is the process for return or replacement of LMR33620APCQRNXRQ1?
All LMR33620APCQRNXRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMR33620APCQRNXRQ1, 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 LMR33620APCQRNXRQ1 part is unused and in its original packaging.
Return procedure for LMR33620APCQRNXRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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