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Texas Instruments LMR33620AQRNXRQ1
- Part No.:
- LMR33620AQRNXRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 12-PowerVFQFN
- Datasheet:
-
LMR33620AQRNXRQ1.pdf
- Description:
- IC REG BUCK ADJ 2A 12VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,774
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Product details
Overview
LMR33620AQRNXRQ1 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, adjustable 1 V–24 V output, and fixed 400 kHz switching frequency. It integrates 75 mΩ/50 mΩ RDS(on) MOSFETs, peak-current-mode control, and a 68 ns minimum on-time for high-voltage-ratio regulation in infotainment power rails.
For engineers reviewing the LMR33620AQRNXRQ1 datasheet, LMR33620AQRNXRQ1 pinout, LMR33620AQRNXRQ1 application, or LMR33620AQRNXRQ1 equivalent, key selection considerations include its AEC-Q100 qualification, functional safety documentation support, 25 µA operating quiescent current, integrated compensation, and wettable-flank 3 mm × 2 mm VQFN package optimized for EMI-sensitive automotive PCB layouts.
Technical Context
The LMR33620AQRNXRQ1 implements peak-current-mode control with automatic PFM/PWM mode transition to maintain >95% peak efficiency across load range. Its architecture supports ultra-low dropout operation - regulating 3.3 V from 3.8 V input - enabled by short 68 ns minimum on-time and adaptive frequency foldback at light loads.
It features precision enable thresholds (1.231 V rising, 100 mV hysteresis), internal 5-V VCC LDO, open-drain power-good flag with glitch filtering (60–170 µs), and comprehensive protection including cycle-by-cycle current limit, hiccup-mode short-circuit response (94 ms off-time), thermal shutdown (165 °C), and input UVLO.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.8 V to 36 V - supports wide automotive battery transients including cold-crank (4.5 V) and load-dump (36 V). |
| Output Current | 2 A continuous - sufficient for USB charging, MCU core rails, and sensor interface supplies in telematics units. |
| Switching Frequency | 400 kHz - balances EMI performance and inductor size; avoids AM band interference while enabling compact magnetics. |
| RDS(on) (HS/LS) | 75 mΩ / 50 mΩ - minimizes conduction loss and thermal rise at full load in 3 mm × 2 mm package. |
| Quiescent Current | 25 µA operating / 5 µA shutdown - extends battery life in always-on automotive modules during sleep mode. |
| Min On-Time | 68 ns - enables high step-down ratios (e.g., 24 V → 3.3 V) without pulse-skipping instability. |
| Feedback Reference | 1.000 V ±1.5% - ensures tight output regulation accuracy over temperature and line/load conditions. |
Pinout & Package
The LMR33620AQRNXRQ1 is housed in a 12-pin VQFN (RNX) package measuring 3.00 mm × 2.00 mm × 0.85 mm with wettable flanks for automated optical inspection and robust solder joint reliability in automotive reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 11 PGND | Power ground | Low-inductance return path for high di/dt switch currents; must be connected directly to AGND and input/output capacitors via wide copper pours. |
| 2, 10 VIN | Main input supply | Accepts 3.8–36 V; requires local 10–22 µF ceramic capacitor placed adjacent to pins 2/10 with minimal loop area to PGND. |
| 3 NC | No-connect | Internally unconnected; used on PCB to route CBOOT capacitor to SW node - simplifies layout in HotRod™ configuration. |
| 4 BOOT | Bootstrap supply | Drives high-side MOSFET gate; requires 100 nF X7R capacitor between BOOT and SW to sustain gate drive above VIN. |
| 5 VCC | Internal LDO output | 5 V ±2.5% regulated supply for control circuitry; decoupled with 1 µF ceramic to AGND; not for external loading. |
| 6 AGND | Analog ground reference | Reference for FB, EN, PG, and internal error amplifier; isolated from noisy PGND except at single-point star connection. |
| 7 FB | Feedback input | Monitors output voltage via resistor divider; 1.000 V reference sets VOUT = 1.000 × (1 + RFBT/RFBB); must not be floated or grounded. |
| 8 PG | Power-good flag | Open-drain output asserting high when VOUT is within ±5% of target; includes 170 µs glitch filter to ignore transient excursions. |
| 9 EN | Enable control | Logic-level input with 1.231 V rising threshold and 100 mV hysteresis; supports precise input UVLO implementation using external resistor divider. |
| 12 SW | Switch node | Connects to power inductor; carries high-frequency square wave (0 to VIN); requires tight coupling to PGND and minimal trace length to reduce EMI. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C ambient operation with full electrical testing per automotive stress 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 need for external Type II/III compensation components - reduces BOM count and design iteration time. |
| HotRod™ package with wettable flanks | Reduces parasitic inductance by >50% vs. standard QFN; enables cleaner switch-node waveform and lower radiated EMI. |
| Parallel VIN/PGND pin layout | Symmetrical input current paths cancel magnetic fields - measured EMI reduction of 6–10 dB in 30–100 MHz band. |
Applications
| Infotainment USB Charging | Telematics Control Unit |
|---|---|
Use Scenario: Powering dual-port 5-V USB chargers in center-stack displays with battery input ranging from 9 V to 16 V. IC Role / Device Role / Timing Role: Primary 2-A buck regulator generating stable 5-V rail; manages dynamic load steps up to 2 A with <100-µs transient response. Use Value: Maintains regulation during cold-crank (6 V min) and load-dump (36 V max) events while consuming only 25 µA in standby. | Use Scenario: Supplying 3.3-V logic rail for cellular modem, GNSS receiver, and CAN transceiver in vehicle-to-cloud gateway modules. IC Role / Device Role / Timing Role: High-efficiency point-of-load converter with power-good signaling to coordinate system reset and firmware boot sequence. Use Value: Delivers >92% efficiency at 100 mA (always-on state) and >95% at 1 A, minimizing thermal impact in sealed enclosures. |
| ADAS Camera Module | Instrument Cluster Microcontroller |
Use Scenario: Providing clean 1.2-V core supply for image signal processor (ISP) in rear-view camera systems with strict EMI limits. IC Role / Device Role / Timing Role: Low-noise synchronous buck with 400 kHz fixed frequency and minimized switch-node ringing via HotRod™ layout. Use Value: Achieves CISPR-25 Class 5 radiated emissions compliance without additional shielding or ferrites due to symmetrical VIN/PGND routing. | Use Scenario: Generating 5-V auxiliary rail for display driver ICs and touch controller in digital instrument clusters with variable backlight load. IC Role / Device Role / Timing Role: Adjustable-output buck supporting multiple cluster configurations via FB resistor selection; enables single-BOM flexibility. Use Value: Supports seamless transition from 5-V fixed to 3.3-V or 1.8-V outputs using same footprint - reduces inventory and validation effort. |
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 suited for space-constrained designs requiring smaller inductors; higher frequency increases light-load switching losses. | Select when board area is critical and EMI filtering can accommodate higher fundamental frequency. |
| TPS543320RHLT | 3.5-A output, 2.2-MHz operation, PMBus interface, and enhanced thermal performance in 3.5-mm × 4.5-mm QFN. | Targets higher-power ADAS domains; adds digital configurability but increases BOM complexity and cost. | Choose when system requires programmable voltage sequencing, telemetry, or >2-A capability with automotive qualification. |
Compared with LMR33620BQRNXRQ1 and TPS543320RHLT, the LMR33620AQRNXRQ1 offers optimal balance of low EMI (400 kHz), minimal external component count, and proven field reliability in USB charging and telematics applications - making it the preferred choice where cost, layout simplicity, and CISPR-25 compliance are primary drivers.
Availability
LMR33620AQRNXRQ1 is available at Aetrix Electronics and suitable for automotive infotainment, telematics control units, and ADAS camera modules requiring stable component supply, long-term lifecycle assurance, and AEC-Q100-compliant sourcing.
Supply support for LMR33620AQRNXRQ1 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 over 40 years of automotive qualification experience.
The LMR33620AQRNXRQ1 belongs to TI's automotive-qualified SIMPLE SWITCHER® buck regulator family, designed specifically for rugged, high-reliability power conversion in infotainment, body electronics, and ADAS subsystems.
FAQ
What is the maximum input voltage rating for the LMR33620AQRNXRQ1?
The LMR33620AQRNXRQ1 has an absolute maximum input voltage rating of 38 V, with recommended operating range from 3.8 V to 36 V. This allows safe operation during automotive load-dump events (up to 36 V per ISO 7637-2) while maintaining regulation down to cold-crank conditions (~6 V). Exceeding 38 V risks permanent damage to the internal high-side MOSFET and control circuitry.
Does the LMR33620AQRNXRQ1 require external compensation components?
No, the LMR33620AQRNXRQ1 integrates a complete Type II compensation network internally. This eliminates the need for external resistors and capacitors typically required in externally compensated buck regulators, reducing solution size, BOM count, and design validation effort. The internal compensation is optimized for stability with standard 1–2.2 µH shielded inductors and ceramic output capacitors.
How does the power-good (PG) flag behave during startup and fault conditions for the LMR33620AQRNXRQ1?
The LMR33620AQRNXRQ1 PG pin asserts high after a ~4-ms delay following EN assertion, indicating valid regulation. It pulls low during undervoltage (VOUT < 92% of target), overvoltage (VOUT > 107%), thermal shutdown, or current-limit hiccup events. A built-in 170-µs glitch filter prevents false triggering during transient load steps. When EN is pulled low, PG is forced low regardless of output status.
Can the LMR33620AQRNXRQ1 operate in dropout condition, and what is its minimum dropout voltage?
Yes, the LMR33620AQRNXRQ1 supports dropout operation with a minimum switch on-time of 68 ns, enabling regulation at high duty cycles. At 5-V output and 1-A load, the typical dropout voltage is 150 mV - meaning it maintains regulation with VIN as low as 5.15 V. In dropout, switching frequency decreases to extend effective duty cycle, clamping at ~140 kHz minimum per internal timing limits.
What package type and dimensions does the LMR33620AQRNXRQ1 use, and why is the wettable flank feature important?
The LMR33620AQRNXRQ1 uses a 12-pin VQFN (RNX) package sized 3.00 mm × 2.00 mm × 0.85 mm with wettable flanks. Wettable flanks expose solderable copper on the package sidewalls, enabling automated optical inspection (AOI) of solder joints - a critical requirement for zero-defect automotive manufacturing. This feature improves process yield and field reliability in high-vibration environments.
LMR33620AQRNXRQ1 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:
- 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)
LMR33620AQRNXRQ1 FAQ
1.How can I place an order for LMR33620AQRNXRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR33620AQRNXRQ1 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 LMR33620AQRNXRQ1 reliable?
The price and inventory of LMR33620AQRNXRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR33620AQRNXRQ1 is usually 5 days.
3.What payment methods are accepted for LMR33620AQRNXRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR33620AQRNXRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR33620AQRNXRQ1?
LMR33620AQRNXRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR33620AQRNXRQ1 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 LMR33620AQRNXRQ1?
For technical support, including LMR33620AQRNXRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR33620AQRNXRQ1 requirements.
6.How does Aetrix verify that LMR33620AQRNXRQ1 is sourced from the original manufacturer or authorized distributors?
All LMR33620AQRNXRQ1 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 LMR33620AQRNXRQ1 meets industry standards.
7.What is the process for return or replacement of LMR33620AQRNXRQ1?
All LMR33620AQRNXRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMR33620AQRNXRQ1, 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 LMR33620AQRNXRQ1 part is unused and in its original packaging.
Return procedure for LMR33620AQRNXRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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