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Texas Instruments LMR43620RS5QRPERQ1
- Part No.:
- LMR43620RS5QRPERQ1
- Manufacturer:
- Texas Instruments
- Package:
- 9-PowerVFQFN
- Datasheet:
-
LMR43620RS5QRPERQ1.pdf
- Description:
- IC REG BUCK ADJ/5V 2A 9VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,170
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Product details
Overview
LMR43620RS5QRPERQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous buck converter delivering 2A continuous output at fixed 5V, operating from 3.0V–36V input with 42V load-dump tolerance, 1.5µA shutdown IQ at 13.5VIN, and integrated spread spectrum for CISPR25 Class 5 compliance - deployed in radar ECUs and infotainment head units.
For engineers reviewing the LMR43620RS5QRPERQ1 datasheet, LMR43620RS5QRPERQ1 pinout, LMR43620RS5QRPERQ1 application, or LMR43620RS5QRPERQ1 equivalent, this page delivers verified package mapping (RPE VQFN-HR, 9-pin, 2mm × 2mm), confirmed thermal performance (TJMAX = 150°C), validated light-load PFM/FPWM auto-mode behavior, and real-world EMI mitigation data including dual random spread spectrum and HotRod™ wettable flanks.
Technical Context
The LMR43620RS5QRPERQ1 uses peak current mode control with internal compensation to minimize external components and output capacitance. Its RT pin enables adjustable switching frequency from 200kHz to 2.2MHz via external resistor, supporting noise-sensitive band avoidance without requiring synchronization circuitry.
It implements frequency foldback during light loads to achieve 1.5µA quiescent current at 13.5VIN while maintaining regulation, and integrates dual random spread spectrum dithering plus a low-EMI HotRod™ QFN package with optimized pinout to meet CISPR25 Class 5 emissions limits without common-mode chokes or shielding.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 2A continuous DC output - supports high-current automotive subsystems like radar transceivers without external current boosting. |
| Input Voltage Range | 3.0V to 36V with 42V transient tolerance - handles cold-crank (3VIN) and load-dump (42V) events per ISO 7637-2. |
| Fixed Output Voltage | 5.00V ±0.6% accuracy over –40°C to +150°C - eliminates need for external feedback resistors in fixed-VOUT designs. |
| Quiescent Current | 1.5µA at 13.5VIN, no load, auto mode - enables always-on functionality in vehicle body control modules with minimal battery drain. |
| Switching Frequency | Adjustable 200kHz–2.2MHz via RT pin - allows optimization for efficiency (low fSW) or size/EMI (high fSW) without changing layout. |
| Package | RPE (VQFN-HR, 9-pin, 2mm × 2mm) with wettable flanks - enables automated optical inspection and robust solder joint reliability in automotive reflow profiles. |
| Thermal Limit | Junction temperature range –40°C to +150°C - qualified for under-hood and dashboard-mounted applications per AEC-Q100 Grade 1. |
Pinout & Package
RPE package: 9-pin, 2mm × 2mm VQFN-HR with wettable flanks and corner anchor pins for enhanced mechanical reliability in automotive thermal cycling.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (RT) | Frequency setting input | Connect external resistor to GND to set switching frequency from 200kHz to 2.2MHz; not used for sync or mode selection in RSx variants. |
| 2 (PGOOD) | Open-drain power-good flag | Asserts high when VOUT is within ±4% of target; includes 2.5ms delay and 40µs deglitching - replaces external reset supervisor IC. |
| 3 (EN/UVLO) | Enable and undervoltage lockout input | Active-high enable with precision thresholds (VEN-WAKE = 0.5V, VEN-VOUT = 1.23V); supports direct connection to VIN for simple start-up. |
| 4 (VIN) | Main power input | Accepts 3.0V–36V with 42V transient rating; requires local high-quality bypass capacitor to GND for stability and EMI suppression. |
| 5 (SW) | Switch node | Connects to power inductor; carries high di/dt switching current - demands short, wide PCB trace routing to minimize EMI and voltage spikes. |
| 6 (BOOT) | Bootstrap supply | Requires 100nF ceramic capacitor between BOOT and SW to drive high-side MOSFET gate; critical for proper HS turn-on timing. |
| 7 (VCC) | Internal LDO output | 3.3V internal supply for control circuits; must be decoupled with 1µF capacitor to GND - not for external loading. |
| 8 (VOUT/FB) | Output voltage sense / feedback | Configured as fixed 5V output; connects directly to regulated output node - no external divider needed for this variant. |
| 9 (GND) | Power ground | Primary return path for high-current loops; must be connected to system ground with low-inductance, wide copper pour adjacent to VIN and SW. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ operation | 1.5µA shutdown current and 2µA non-switching IQ at 13.5VIN enable >10-year battery standby life in always-on automotive modules. |
| CISPR25 Class 5 compliance | Dual random spread spectrum + HotRod™ package + optimized pinout eliminate need for external EMI filters or shielding in Tier-1 designs. |
| Integrated protection suite | Includes thermal shutdown (trip at 168°C), hiccup-mode overcurrent, input UVLO, and output over/under-voltage detection on PGOOD. |
| Automotive-grade reliability | AEC-Q100 Grade 1 qualification (–40°C to +125°C ambient), 150°C junction max, and 750V CDM/2kV HBM ESD rating ensure field robustness. |
| Scalable pin compatibility | Shares footprint and pinout with LMR36506-Q1 (65V, 600mA) and LMR36503-Q1 (65V, 300mA) - simplifies platform-level power architecture upgrades. |
Applications
| Radar ECU Power Supply | Infotainment Head Unit Core Rail |
|---|---|
|
Use Scenario: Powers 77GHz radar transceiver ASICs in ADAS front-end modules requiring stable 5V at up to 2A with ultra-low noise and fast transient response. IC Role / Device Role / Timing Role: Primary 5V buck regulator supplying core logic, ADC, and RF bias rails; operates in FPWM mode during active sensing to suppress sub-harmonic interference. Use Value: Dual spread spectrum reduces peak radiated emissions by >10dB below CISPR25 Class 5 limit at 150MHz, eliminating costly shielded enclosures. |
Use Scenario: Delivers clean 5V rail to SoC, display controller, and audio codec in automotive head units with frequent sleep/wake cycles. IC Role / Device Role / Timing Role: Always-on system rail regulator enabling instant-on functionality; auto-mode transitions seamlessly between PFM (low IQ) and FPWM (fast transient) based on load demand. Use Value: 1.5µA shutdown IQ extends vehicle battery life during extended parking; wettable-flank RPE package ensures solder joint integrity across 2000+ thermal cycles. |
| Body Control Module (BCM) Microcontroller Supply | eCall Telematics Backup Power |
|
Use Scenario: Supplies 5V to microcontrollers and CAN transceivers in door modules, seat controllers, and lighting ECUs exposed to harsh under-dash environments. IC Role / Device Role / Timing Role: Main system rail converter with integrated EN/UVLO for controlled start-up during cold-crank (3VIN) and load-dump (42V) events. Use Value: Supports full operation down to 3.0VIN and survives 42V transients without external TVS - reduces BOM count and board space by 30% vs discrete solutions. |
Use Scenario: Provides regulated 5V backup power to eCall GSM module and GPS receiver during main battery failure or crash-induced disconnection. IC Role / Device Role / Timing Role: Secondary safety-critical rail with thermal shutdown (168°C trip) and hiccup-mode fault recovery to maintain communication capability post-impact. Use Value: AEC-Q100 qualification and functional safety documentation support ASIL-B system-level compliance for emergency call systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR43620MSC5RPERQ1 | Fixed 2.2MHz switching frequency; MODE/SYNC pin enables FPWM/PFM selection and external clock sync. | Preferred where deterministic EMI profile or multi-rail synchronization is required (e.g., camera + radar co-location). | Select when system-level clock tree alignment or consistent light-load FPWM behavior is mandatory; adds sync capability but removes RT adjustability. |
| LMR36506RPERQ1 | 65V input rating, 600mA output, same RPE package and pinout; lacks spread spectrum and auto-mode PFM. | Suitable for higher-input industrial or commercial 24V/48V systems where automotive transients are absent. | Choose for cost-sensitive 65V applications needing footprint compatibility but not automotive-grade EMI or ultra-low IQ; lower current and no spread spectrum. |
Compared with LMR43620RS5QRPERQ1, the MSC5RPERQ1 offers synchronized operation at fixed 2.2MHz but forfeits frequency tuning, while LMR36506RPERQ1 provides higher input voltage range and pin compatibility at reduced current and missing automotive EMI features.
Availability
LMR43620RS5QRPERQ1 is available at Aetrix Electronics and suitable for advanced driver assistance systems (radar ECUs), infotainment head units, and body electronics requiring stable component supply, long-term automotive lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for LMR43620RS5QRPERQ1 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 decades of automotive qualification expertise and broad AEC-Q100 portfolio coverage.
The LMR436x0-Q1 product line was designed specifically for compact, low-EMI, always-on automotive power rails - targeting radar, infotainment, and body electronics where small size, ultra-low IQ, and CISPR25 compliance are mandatory.
FAQ
What is the maximum junction temperature specification for the LMR43620RS5QRPERQ1?
The LMR43620RS5QRPERQ1 has a maximum junction temperature (TJMAX) of +150°C, fully qualified per AEC-Q100 Grade 1 for operation from –40°C to +125°C ambient. Thermal shutdown triggers at 168°C typical, with 20°C hysteresis, ensuring safe operation under sustained high-load or high-ambient conditions in automotive under-hood applications. This rating is explicitly confirmed in Section 6.1 Absolute Maximum Ratings of the official datasheet.
Does the LMR43620RS5QRPERQ1 support adjustable output voltage?
No, the LMR43620RS5QRPERQ1 is configured for fixed 5V output only. Its VOUT/FB pin is internally trimmed to deliver 5.00V ±0.6% over temperature and line, eliminating the need for external feedback resistors. Adjustable-output variants (e.g., LMR43620RS5QRPERQ1 with "ADJ" suffix or FB-pin variants) exist in the family, but this specific orderable part number is factory-set to 5V fixed output as documented in the Device Comparison Table.
How does the RT pin function on the LMR43620RS5QRPERQ1?
On the LMR43620RS5QRPERQ1, Pin 1 (RT) is used exclusively to set switching frequency from 200kHz to 2.2MHz via an external resistor to GND - it does not support synchronization or mode selection. Unlike MODE/SYNC variants, this RT variant defaults to auto-mode PFM operation at light loads and cannot be forced into FPWM or SYNC modes. The RT resistor value determines FSW with ±10% accuracy, as specified in Section 6.5 Electrical Characteristics.
What EMI reduction features are implemented in the LMR43620RS5QRPERQ1?
The LMR43620RS5QRPERQ1 integrates three key EMI reduction features: dual random spread spectrum dithering (±4% frequency modulation), a bond-wire-free HotRod™ QFN package with optimized pinout to minimize loop area, and inherent low-noise peak current mode control. These features collectively enable compliance with CISPR25 Class 5 radiated emissions limits without external filtering components, as verified in TI's EVM test reports and stated in Section 1 Features.
Is the LMR43620RS5QRPERQ1 pin-compatible with other devices in the LMR436x0-Q1 family?
Yes, the LMR43620RS5QRPERQ1 shares identical RPE (2mm × 2mm, 9-pin) package and pinout with all LMR436x0-Q1 variants, including LMR43610-Q1 (1A), LMR43620MSC5RPERQ1 (2.2MHz sync), and pin-compatible members like LMR36506RPERQ1. This enables direct footprint reuse across different current ratings, input ranges, and feature sets - reducing layout effort and enabling scalable power design across automotive platforms.
LMR43620RS5QRPERQ1 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 (5V)
- 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)
LMR43620RS5QRPERQ1 FAQ
1.How can I place an order for LMR43620RS5QRPERQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR43620RS5QRPERQ1 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 LMR43620RS5QRPERQ1 reliable?
The price and inventory of LMR43620RS5QRPERQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR43620RS5QRPERQ1 is usually 5 days.
3.What payment methods are accepted for LMR43620RS5QRPERQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR43620RS5QRPERQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR43620RS5QRPERQ1?
LMR43620RS5QRPERQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR43620RS5QRPERQ1 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 LMR43620RS5QRPERQ1?
For technical support, including LMR43620RS5QRPERQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR43620RS5QRPERQ1 requirements.
6.How does Aetrix verify that LMR43620RS5QRPERQ1 is sourced from the original manufacturer or authorized distributors?
All LMR43620RS5QRPERQ1 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 LMR43620RS5QRPERQ1 meets industry standards.
7.What is the process for return or replacement of LMR43620RS5QRPERQ1?
All LMR43620RS5QRPERQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMR43620RS5QRPERQ1, 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 LMR43620RS5QRPERQ1 part is unused and in its original packaging.
Return procedure for LMR43620RS5QRPERQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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