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Texas Instruments LMR33620AQ5RNXTQ1
- Part No.:
- LMR33620AQ5RNXTQ1
- Manufacturer:
- Texas Instruments
- Package:
- 12-PowerVFQFN
- Datasheet:
-
LMR33620AQ5RNXTQ1.pdf
- Description:
- IC REG BUCK 5V 2A 12VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:698
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Product details
Overview
LMR33620AQ5RNXTQ1 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 5-V output, 400 kHz switching frequency, and integrated 75-mΩ/50-mΩ MOSFETs. It serves as primary power supply for infotainment USB charging and telematics control units in harsh vehicle environments.
For engineers reviewing the LMR33620AQ5RNXTQ1 datasheet, LMR33620AQ5RNXTQ1 pinout, LMR33620AQ5RNXTQ1 application, or LMR33620AQ5RNXTQ1 equivalent, key selection criteria include its 5-V fixed output, 400 kHz frequency option, wettable-flank VQFN package, automotive thermal range (–40°C to +125°C), and functional safety documentation support.
Technical Context
The LMR33620AQ5RNXTQ1 implements peak-current-mode control with automatic PFM/PWM mode transition to maintain high efficiency across load range. Its 68 ns minimum on-time enables high VIN-to-VOUT step-down ratios - e.g., regulating 5 V from as low as 3.8 V input - while integrated compensation eliminates external loop components.
It features precision enable thresholds (VEN-H = 1.231 V typ), open-drain power-good flag with glitch filtering (tPG = 60–170 µs), and robust protection including cycle-by-cycle current limit, hiccup-mode short-circuit response (tHC = 94 ms), thermal shutdown (TSD = 165°C), and input UVLO. The device operates with 25 µA typical quiescent current and 5 µA shutdown current.
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 5 V - eliminates external feedback resistors; regulated to ±2.5% over line/load/temperature. |
| Output Current | 2 A continuous - sufficient for dual-USB port charging or microcontroller + peripheral rail in TCU. |
| Switching Frequency | 400 kHz - balances EMI performance and inductor size; avoids AM radio band and enables compact magnetics. |
| RDS(on) | 75 mΩ (HS) / 50 mΩ (LS) - minimizes conduction loss at 2 A, enabling >95% peak efficiency. |
| Quiescent Current | 25 µA (operating) / 5 µA (shutdown) - extends battery life during vehicle sleep modes. |
| Package | VQFN-12 (3 mm × 2 mm, 0.85 mm height) with wettable flanks - supports automated optical inspection and improves thermal dissipation. |
Pinout & Package
The LMR33620AQ5RNXTQ1 is housed in a 12-pin VQFN (RNX) package measuring 3.00 mm × 2.00 mm × 0.85 mm, featuring wettable flanks for solder-joint inspection and optimized thermal/EMI layout with symmetrical VIN/PGND pins.
| 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 high-quality ceramic capacitor directly to PGND for transient suppression. |
| 3 NC | No connect | Internally unconnected; used on PCB to simplify CBOOT-to-SW routing per TI layout guidance. |
| 4 BOOT | Bootstrap supply | Drives high-side MOSFET gate; requires 100-nF ceramic capacitor to SW pin for proper gate drive. |
| 5 VCC | Internal 5-V LDO output | Powers internal circuitry; can supply logic for PG flag but must not drive external loads. |
| 6 AGND | Analog ground reference | Ground for FB, EN, PG; separate from PGND in layout to minimize noise coupling into feedback path. |
| 7 FB | Feedback input | Connected directly to VOUT near output capacitor for fixed 5-V version; sets regulation point. |
| 8 PG | Open-drain power-good flag | Signals valid output (high) or fault (low); requires external pull-up resistor; active during startup and faults. |
| 9 EN | Enable input | Logic-controlled ON/OFF; precision thresholds (1.231 V typ) allow adjustable UVLO via external 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 |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C ambient operation, meeting automotive reliability and stress-test requirements. |
| Functional safety documentation | Includes FIT rate, failure mode analysis, and safety manual to support ISO 26262 ASIL-B system integration. |
| Integrated compensation network | Eliminates external Type II/III compensation components, reducing BOM count and design iteration time. |
| HotRod™ package with parallel VIN/PGND paths | Reduces parasitic inductance and magnetic field coupling, lowering EMI emissions by up to 10 dB vs standard QFN. |
| Automatic light-load PFM mode | Maintains >85% efficiency at 1 mA load by reducing switching frequency, critical for always-on automotive modules. |
Applications
| Infotainment USB Charging | Telematics Control Unit (TCU) |
|---|---|
Use Scenario: Powering dual USB-A ports in center-stack display or head unit, supporting BC1.2 or proprietary fast-charge protocols under varying battery voltage (9–16 V). IC Role / Device Role / Timing Role: Primary 5-V buck regulator supplying USB PHY, port controllers, and level shifters; provides stable rail during engine cranking. Use Value: 2-A capability supports simultaneous charging of two devices; 400 kHz switching enables small 2.2-µH inductor and <1000-µF total output capacitance. | Use Scenario: Generating 5-V rail for cellular modem, GNSS receiver, CAN transceiver, and MCU in vehicle-to-cloud communication module. IC Role / Device Role / Timing Role: Main system power supply with power-good signaling to enable safe boot sequencing and brownout detection. Use Value: 5-µA shutdown current extends battery runtime during vehicle park mode; wettable-flank VQFN ensures reliable reflow in high-volume automotive SMT lines. |
| Automotive Camera Module | ADAS Domain Controller Auxiliary Rail |
Use Scenario: Providing clean 5-V supply to image sensor, ISP, and serializer in rear-view or surround-view camera systems exposed to under-hood temperatures. IC Role / Device Role / Timing Role: Point-of-load regulator with thermal shutdown (165°C) and hiccup-mode short-circuit protection for fault containment. Use Value: 125°C junction rating allows placement near heat sources; 68 ns min on-time supports operation down to 3.8 V input during cold-crank. | Use Scenario: Generating auxiliary 5-V rail for interface logic, EEPROM, and debug interfaces in centralized ADAS compute platforms. IC Role / Device Role / Timing Role: Secondary power domain regulator with independent enable and power-good monitoring for modular subsystem power management. Use Value: Precision enable threshold (±10 mV) enables accurate input UVLO setting; integrated PG flag simplifies system reset coordination without external supervisor IC. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR33620BQ5RNXTQ1 | Same package and 5-V fixed output, but 1.4 MHz switching frequency - higher frequency enables smaller inductors/capacitors but increases switching loss at high load. | Better suited for space-constrained layouts where EMI filtering is managed separately; less optimal for high-efficiency 2-A continuous operation. | Select when board area is critical and thermal margin allows higher-frequency operation. |
| TPS543320RTWR | 36-V, 3-A buck with PMBus interface, 500 kHz–2.2 MHz programmable frequency, and higher RDS(on) (80/60 mΩ); requires external compensation. | Targeted at digitally controlled power systems needing telemetry and dynamic voltage scaling; adds complexity and cost. | Choose only if digital monitoring, sequencing, or adaptive frequency control is required - not a drop-in replacement. |
Compared with LMR33620BQ5RNXTQ1, the LMR33620AQ5RNXTQ1 prioritizes peak efficiency and thermal performance at 400 kHz, while the TPS543320RTWR trades simplicity for digital configurability and higher current - making the LMR33620AQ5RNXTQ1 optimal for cost-sensitive, analog-controlled automotive rails where reliability and ease of use are paramount.
Availability
LMR33620AQ5RNXTQ1 is available at Aetrix Electronics and suitable for automotive infotainment, telematics, and ADAS applications requiring stable component supply, AEC-Q100 compliance, and long-term production continuity.
Supply support for LMR33620AQ5RNXTQ1 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 LMR33620-Q1 product line delivers easy-to-use, high-efficiency synchronous buck converters optimized for rugged automotive environments - designed to replace discrete buck designs with minimal external components and simplified layout.
FAQ
What is the switching frequency of the LMR33620AQ5RNXTQ1 and how is it set?
The LMR33620AQ5RNXTQ1 operates at a fixed 400 kHz switching frequency. This frequency is factory-programmed and cannot be adjusted externally - it is determined by the "A" variant designation in the part number. No external resistor or clock signal is required to configure frequency, simplifying design and ensuring consistent EMI behavior across production units.
Does the LMR33620AQ5RNXTQ1 require external feedback resistors for its 5-V output?
No, the LMR33620AQ5RNXTQ1 is the fixed 5-V output version and does not require external feedback resistors. The feedback divider is integrated internally; the FB pin is connected directly to the VOUT net near the output capacitor. This eliminates resistor tolerance errors and reduces component count versus adjustable versions like the LMR33620AQRNXTQ1.
How does the power-good (PG) flag behave during startup and fault conditions for the LMR33620AQ5RNXTQ1?
The LMR33620AQ5RNXTQ1 PG pin is an open-drain output that remains low for ~4 ms after EN is asserted, then goes high when VOUT reaches 95% of 5 V and remains within regulation windows (90–105% for falling edge, 92–107% for rising edge). It pulls low during thermal shutdown, current limit, or EN deactivation - with a 60–170 µs glitch filter preventing false trips from transient excursions.
What package type and dimensions does the LMR33620AQ5RNXTQ1 use, and why is the wettable flank feature important?
The LMR33620AQ5RNXTQ1 uses a 12-pin VQFN (RNX) package sized 3.00 mm × 2.00 mm × 0.85 mm with wettable flanks. The wettable flanks enable automated optical inspection (AOI) of solder joints - a critical requirement for automotive manufacturing - while the HotRod™ layout minimizes loop inductance, improving EMI performance and thermal resistance (RθJA = 72.5°C/W).
Can the LMR33620AQ5RNXTQ1 operate with input voltage as low as 3.8 V while delivering 5 V output?
Yes, the LMR33620AQ5RNXTQ1 supports input voltages down to 3.8 V while regulating a stable 5-V output, enabled by its 68 ns minimum on-time and peak-current-mode architecture. At 3.8 V input, the device achieves ~90% duty cycle to sustain 5 V output - verified across temperature and load per datasheet Section 6.7, making it suitable for cold-crank scenarios in 12-V automotive systems.
LMR33620AQ5RNXTQ1 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)
LMR33620AQ5RNXTQ1 FAQ
1.How can I place an order for LMR33620AQ5RNXTQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR33620AQ5RNXTQ1 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 LMR33620AQ5RNXTQ1 reliable?
The price and inventory of LMR33620AQ5RNXTQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR33620AQ5RNXTQ1 is usually 5 days.
3.What payment methods are accepted for LMR33620AQ5RNXTQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR33620AQ5RNXTQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR33620AQ5RNXTQ1?
LMR33620AQ5RNXTQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR33620AQ5RNXTQ1 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 LMR33620AQ5RNXTQ1?
For technical support, including LMR33620AQ5RNXTQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR33620AQ5RNXTQ1 requirements.
6.How does Aetrix verify that LMR33620AQ5RNXTQ1 is sourced from the original manufacturer or authorized distributors?
All LMR33620AQ5RNXTQ1 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 LMR33620AQ5RNXTQ1 meets industry standards.
7.What is the process for return or replacement of LMR33620AQ5RNXTQ1?
All LMR33620AQ5RNXTQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMR33620AQ5RNXTQ1, 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 LMR33620AQ5RNXTQ1 part is unused and in its original packaging.
Return procedure for LMR33620AQ5RNXTQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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