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Texas Instruments LMR43620RS3QRPERQ1
- Part No.:
- LMR43620RS3QRPERQ1
- Manufacturer:
- Texas Instruments
- Package:
- 9-PowerVFQFN
- Datasheet:
-
LMR43620RS3QRPERQ1.pdf
- Description:
- IC REG BUCK ADJ/3.3V 2A 9VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,157
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Product details
Overview
LMR43620RS3QRPERQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous buck converter delivering 2A continuous output at fixed 3.3V, operating from 3.0V to 36V input with 42V load-dump tolerance. It features 1.2µA non-switching quiescent current at 13.5VIN, peak-current-mode control, and dual random spread spectrum for CISPR25 Class 5 compliance-designed for always-on ADAS radar ECUs and infotainment head units.
For engineers reviewing the LMR43620RS3QRPERQ1 datasheet, LMR43620RS3QRPERQ1 pinout, LMR43620RS3QRPERQ1 application, or LMR43620RS3QRPERQ1 equivalent, key selection considerations include its RT-pin-adjustable switching frequency (200kHz–2.2MHz), absence of MODE/SYNC synchronization capability, integrated compensation, 2mm × 2mm HotRod™ QFN package with wettable flanks, and thermal shutdown at 158°C–186°C.
Technical Context
The LMR43620RS3QRPERQ1 uses peak-current-mode control with internal slope compensation and auto-mode frequency foldback to maintain regulation down to 1.5µA no-load input current. Its control loop integrates a 1V reference amplifier, soft-start timer (3.5ms typical), and hiccup-mode overcurrent protection triggered by high-side peak current limit (2.8–3.9A) and zero-cross detection (30–135mA).
EMI performance is engineered via dual random spread spectrum dithering (±4% Δf), bond-wire-free HotRod™ packaging, and optimized pinout minimizing parasitic inductance. The device supports external UVLO via EN pin (0.7V wake threshold, 0.35V hysteresis) and provides open-drain PGOOD with 2.5ms activation delay and 40µs deglitch filtering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 2A continuous DC output-supports full-load operation in compact automotive modules without forced airflow. |
| Input Voltage Range | 3.0V to 36V with 42V transient tolerance-handles cold-crank (3VIN) and load-dump events in 12V/24V automotive systems. |
| Quiescent Current | 1.5µA at 13.5VIN, no load, auto mode-enables >10-year battery standby in always-on ADAS sensors. |
| Switching Frequency | Adjustable 200kHz–2.2MHz via RT resistor-avoids noise-sensitive bands (e.g., AM radio) and enables size-optimized magnetics. |
| Output Voltage | Fixed 3.3V ±0.9% over –40°C to +150°C-meets tight rail requirements for MCU cores and SerDes interfaces. |
| Package | 2mm × 2mm VQFN-HR (RPE) with wettable flanks-enables automated optical inspection and robust solder joint reliability. |
| Thermal Limit | Junction temperature range –40°C to +150°C; thermal shutdown at 158°C–186°C with 15°C–20°C hysteresis-ensures safe operation under hood conditions. |
Pinout & Package
LMR43620RS3QRPERQ1 is housed in a 9-pin, 2mm × 2mm VQFN-HR (RPE) package with exposed thermal pad and wettable flanks for enhanced solderability and thermal dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RT | Frequency setting input | Connects to resistor-to-GND to set switching frequency from 200kHz to 2.2MHz; not MODE/SYNC-no sync capability. |
| 2 - PGOOD | Open-drain power-good flag | Signals valid output after 2.5ms delay; requires external pull-up; low during EN=low or output fault. |
| 3 - EN/UVLO | Enable and undervoltage lockout | 0.7V wake threshold with 0.35V hysteresis; supports direct connection to VIN for simple enable control. |
| 4 - VIN | Main input supply | Accepts 3.0V–36V with 42V transient rating; bypass capacitor must be placed directly between VIN and GND. |
| 5 - SW | Switch node | Connects to power inductor; carries high di/dt; requires short, low-inductance PCB trace routing. |
| 6 - BOOT | Bootstrap supply | 100nF capacitor to SW provides gate drive for high-side MOSFET; critical for proper HS turn-on. |
| 7 - VCC | Internal LDO output | 3.3V internal supply for control circuitry; decouple with 1µF ceramic to GND; not for external loads. |
| 8 - VOUT/FB | Output voltage sense / feedback | Configured as fixed 3.3V output; connects directly to regulated output node-no external resistors required. |
| 9 - GND | Power ground | Primary return path for high-current loops; connect to CIN with wide, low-inductance traces. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ operation | 1.5µA shutdown current and 1.2µA non-switching IQ enable multi-year battery life in always-on automotive modules. |
| Dual random spread spectrum | Reduces peak EMI emissions by spreading energy across ±4% bandwidth-meets CISPR25 Class 5 without shielding or chokes. |
| Integrated compensation | Eliminates external compensation network-reduces BOM count and layout sensitivity while maintaining stability across all loads. |
| HotRod™ QFN package | 2mm × 2mm footprint with wettable flanks and corner anchor pins ensures reliable reflow soldering and <50°C/W θJA on 4-layer PCB. |
| Auto-mode frequency foldback | Seamlessly transitions from PWM to PFM at light loads-maintains >85% efficiency at 1mA while minimizing audible noise. |
Applications
| Radar ECU Power Supply | Infotainment Head Unit Core Rail |
|---|---|
|
Use Scenario: Powers 77GHz radar transceiver SoC in ADAS front-end module requiring stable 3.3V under engine-off battery drain conditions. IC Role / Device Role / Timing Role: Primary step-down regulator delivering 2A at fixed 3.3V with ultra-low IQ to extend vehicle battery life during parking mode. Use Value: 1.5µA no-load IQ enables >10-year standby without battery depletion; 42V load-dump tolerance prevents field failures during alternator transients. |
Use Scenario: Supplies core logic voltage to infotainment MCU and display interface ICs in automotive head unit with strict EMI limits. IC Role / Device Role / Timing Role: Main 3.3V buck converter operating at 2.2MHz to avoid AM band interference while supporting dynamic load steps up to 2A. Use Value: Dual random spread spectrum and HotRod™ packaging meet CISPR25 Class 5 without added filter components-reducing board area and cost. |
| eCall Module Backup Power | Body Control Module Sensor Interface |
|
Use Scenario: Provides always-on 3.3V rail for eCall telematics controller that must activate within seconds of crash detection using backup battery. IC Role / Device Role / Timing Role: Low-quiescent, high-reliability buck converter enabling rapid wake-up from microamp sleep state with guaranteed PGOOD assertion. Use Value: 2.5ms PGOOD activation delay and 3.5ms soft-start ensure deterministic power-up timing; AEC-Q100 Grade 1 qualification validates operation from –40°C to +125°C ambient. |
Use Scenario: Powers CAN transceivers and LIN interface ICs in body electronics domain controller with variable load profiles. IC Role / Device Role / Timing Role: Compact 2A buck supplying isolated 3.3V domain; RT-pin adjustability allows optimization for EMI vs. efficiency trade-offs per subsystem. Use Value: Adjustable FSW (200kHz–2.2MHz) enables use of smaller inductors in space-constrained BCM layouts while maintaining >90% efficiency at 500mA. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar automotive buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR43620MSC3RPERQ1 | Includes MODE/SYNC pin for external clock synchronization and fixed 2.2MHz FSW; same 3.3V fixed output and 2A rating. | Required where multiple regulators must be phase-synchronized to suppress beat frequencies in multi-rail systems. | Select when system-level EMI control mandates synchronized switching; LMR43620RS3QRPERQ1 lacks this capability. |
| LMR36506RPERQ1 | 65V input rating, 600mA output, pin-compatible 2mm × 2mm HotRod™ package; lower current, higher voltage capability. | Suitable for higher-voltage domains (e.g., 48V mild-hybrid gate drivers) but cannot replace 2A load requirements. | Choose only if input voltage exceeds 36V or output current ≤600mA; not a functional substitute for LMR43620RS3QRPERQ1's 2A capacity. |
Compared with LMR43620MSC3RPERQ1, LMR43620RS3QRPERQ1 trades synchronization capability for simplified design and lower cost in single-regulator applications; versus LMR36506RPERQ1, it delivers triple the output current at lower max input voltage-making it optimal for mainstream 12V/24V ADAS and infotainment rails.
Availability
LMR43620RS3QRPERQ1 is available at Aetrix Electronics and suitable for advanced driver assistance systems (radar ECU), infotainment head units, and body electronics modules requiring stable component supply across automotive production lifecycles.
Supply support for LMR43620RS3QRPERQ1 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 and embedded processing technologies, with deep expertise in automotive-grade power management ICs.
The LMR436x0-Q1 product line was designed specifically for space-constrained, low-IQ automotive applications-including ADAS, infotainment, and body electronics-where ultra-small footprint, AEC-Q100 compliance, and CISPR25 Class 5 EMI performance are mandatory.
FAQ
What is the maximum input voltage transient rating for LMR43620RS3QRPERQ1?
The LMR43620RS3QRPERQ1 supports 42V transients on the VIN pin, meeting automotive load-dump requirements per ISO 7637-2. This rating is validated across the full –40°C to +150°C junction temperature range and applies to transients under 100ns duration. LMR43620RS3QRPERQ1 maintains regulation during these events without latch-up or damage when properly decoupled with ≥10µF ceramic input capacitance.
Does LMR43620RS3QRPERQ1 support adjustable output voltage?
No, LMR43620RS3QRPERQ1 is configured for fixed 3.3V output. Its VOUT/FB pin is internally trimmed and requires direct connection to the output node-no external feedback resistors are needed or supported. For adjustable variants, consider LMR43620RS5QRPERQ1 (5V fixed/adjustable) or RT-pin variants with FB configuration.
What is the thermal shutdown behavior of LMR43620RS3QRPERQ1?
LMR43620RS3QRPERQ1 triggers thermal shutdown at a junction temperature between 158°C and 186°C, with 15°C–20°C hysteresis for recovery. Once tripped, the device halts switching and enters hiccup mode with 30–75ms retry intervals until temperature falls below the recovery threshold. This protects against sustained overload or poor heatsinking in under-hood environments.
Can LMR43620RS3QRPERQ1 operate with no output load?
Yes, LMR43620RS3QRPERQ1 operates stably at zero load in auto mode, drawing only 1.5µA from VIN at 13.5V. Its frequency foldback reduces switching frequency under light loads to maintain regulation while minimizing IQ. No minimum load requirement exists-unloaded operation is fully characterized and supported across the full temperature range.
What package type and dimensions does LMR43620RS3QRPERQ1 use?
LMR43620RS3QRPERQ1 uses the RPE (VQFN-HR) package: a 9-pin, 2mm × 2mm quad flat no-lead with wettable flanks and an exposed thermal pad. The nominal package size includes pins; the die pad measures 1.2mm × 1.2mm. This HotRod™ construction eliminates bond wires to reduce parasitic inductance and improve EMI performance.
LMR43620RS3QRPERQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 9-PowerVFQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable (Fixed)
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 1V (3.3V)
- Voltage - Output (Max):
- 34.2V
- Current - Output:
- 2A
- Frequency - Switching:
- 200kHz ~ 2.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 9-VQFN-HR (2x2)
LMR43620RS3QRPERQ1 FAQ
1.How can I place an order for LMR43620RS3QRPERQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR43620RS3QRPERQ1 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 LMR43620RS3QRPERQ1 reliable?
The price and inventory of LMR43620RS3QRPERQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR43620RS3QRPERQ1 is usually 5 days.
3.What payment methods are accepted for LMR43620RS3QRPERQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR43620RS3QRPERQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR43620RS3QRPERQ1?
LMR43620RS3QRPERQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR43620RS3QRPERQ1 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 LMR43620RS3QRPERQ1?
For technical support, including LMR43620RS3QRPERQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR43620RS3QRPERQ1 requirements.
6.How does Aetrix verify that LMR43620RS3QRPERQ1 is sourced from the original manufacturer or authorized distributors?
All LMR43620RS3QRPERQ1 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 LMR43620RS3QRPERQ1 meets industry standards.
7.What is the process for return or replacement of LMR43620RS3QRPERQ1?
All LMR43620RS3QRPERQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMR43620RS3QRPERQ1, 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 LMR43620RS3QRPERQ1 part is unused and in its original packaging.
Return procedure for LMR43620RS3QRPERQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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