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Texas Instruments LMR43620MSC3RPERQ1
- Part No.:
- LMR43620MSC3RPERQ1
- Manufacturer:
- Texas Instruments
- Package:
- 9-PowerVFQFN
- Datasheet:
-
LMR43620MSC3RPERQ1.pdf
- Description:
- IC REG BUCK ADJ/3.3V 2A 9VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,352
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Product details
Overview
LMR43620MSC3RPERQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous buck converter delivering 2A continuous output at fixed 3.3V or adjustable output, with 1.2µA non-switching quiescent current at 13.5VIN, 2.2MHz fixed switching frequency, and operation across –40°C to +150°C junction temperature. It serves as the primary power supply for always-on radar ECUs and infotainment head units.
For engineers reviewing the LMR43620MSC3RPERQ1 datasheet, LMR43620MSC3RPERQ1 pinout, LMR43620MSC3RPERQ1 application, or LMR43620MSC3RPERQ1 equivalent, key selection criteria include ultra-low IQ at high temperature, CISPR25 Class 5 EMI compliance, FPWM/PFM mode selectability via MODE/SYNC, 42V load dump tolerance, and 2mm × 2mm HotRod™ QFN package with wettable flanks.
Technical Context
The LMR43620MSC3RPERQ1 uses peak current mode control with internal compensation and dual random spread spectrum dithering to minimize output capacitance and meet CISPR25 Class 5 emissions without external filters. Its auto-mode frequency foldback enables 1.5µA unloaded input current at 13.5VIN, while FPWM mode ensures constant 2.2MHz operation under light loads.
It integrates high-side (260mΩ max) and low-side (140mΩ max) MOSFETs, supports 3.0–36V input with 42V transient tolerance, and delivers regulated 3.3V output with ±0.9% accuracy over –40°C to +150°C. The MODE/SYNC pin provides user-selectable PFM/FPWM operation and external clock synchronization capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 2A continuous DC output - supports radar sensor modules requiring stable 3.3V rail under dynamic load conditions. |
| Input Voltage Range | 3.0V to 36V with 42V transient tolerance - handles automotive cold-crank (3V) and load-dump (42V) events without shutdown. |
| Quiescent Current | 1.2µA non-switching IQ at 13.5VIN, 3.3VOUT - enables >10-year battery life in always-on vehicle systems. |
| Switching Frequency | Fixed 2.2MHz - avoids AM band interference and allows use of compact 1µH inductors and 22µF ceramic output capacitors. |
| Output Voltage | Fixed 3.3V ±0.9% accuracy over full temperature and line range - eliminates need for external feedback resistors in standard applications. |
| EMI Performance | CISPR25 Class 5 compliant with integrated spread spectrum and HotRod™ package - removes requirement for common-mode chokes or metal shielding. |
| Junction Temperature | –40°C to +150°C operating range - qualified for under-hood placement in ADAS and body control modules. |
Pinout & Package
LMR43620MSC3RPERQ1 is housed in a 9-pin, 2mm × 2mm VQFN-HR (RPE) HotRod™ package with wettable flanks for automated optical inspection and enhanced solder joint reliability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - MODE/SYNC | Mode control / clock sync input | Selects PFM (auto), FPWM, or external synchronization; must not be floated; drives internal PLL for in-phase locking. |
| 2 - PGOOD | Open-drain power-good flag | Signals valid regulation after 2.5ms delay; sinks 200µA with <100Ω on-resistance; used for system reset sequencing. |
| 3 - EN/UVLO | Enable / undervoltage lockout input | Starts regulation when >0.7V; shuts down below 0.5V; supports direct connection to VIN for simple enable logic. |
| 4 - VIN | Main input power supply | Accepts 3.0–36V with 42V transient rating; requires local high-quality bypass capacitor to GND. |
| 5 - SW | Switch node | Connects to power inductor; carries high di/dt switching current; layout critical for EMI performance. |
| 6 - BOOT | Bootstrap supply for high-side driver | Requires 100nF capacitor to SW; enables efficient gate drive of integrated high-side MOSFET. |
| 7 - VCC | Internal LDO output | 3.3V regulated supply for control circuitry; decoupled with 1µF to GND; not for external loading. |
| 8 - VOUT/FB | Output voltage sense / feedback | Configured as fixed 3.3V output; connects directly to output node; internal reference = 1.00V ±0.01V. |
| 9 - GND | Power ground | Primary return path for high-current loops; must be connected to CIN with short, wide traces. |
Key Features
| Feature | Design Value |
|---|---|
| Functional Safety-Capable | Documentation available per ISO 26262 ASIL-B support - enables integration into safety-critical ADAS power domains. |
| Ultra-Low IQ at High Temperature | 1.5µA unloaded IQ at 13.5VIN, 150°C - sustains >85% efficiency at 1mA load for always-on telematics modules. |
| Integrated Spread Spectrum | ±4% frequency dithering - reduces peak EMI by >10dB, enabling CISPR25 Class 5 compliance without filter redesign. |
| Pin-Selectable Light-Load Mode | MODE/SYNC pin configures PFM (auto), FPWM, or SYNC - eliminates need for external mode-control logic in multi-rail systems. |
| HotRod™ Package with Wettable Flanks | 2mm × 2mm QFN with corner anchor pins - enables AOI verification and improves thermal resistance (RθJB = 26.1°C/W). |
Applications
| Radar ECU Power Supply | Infotainment Head Unit Core Rail |
|---|---|
|
Use Scenario: Powers 77GHz radar transceiver ASICs in ADAS front-end modules requiring stable 3.3V under engine-bay thermal stress and load-dump transients. IC Role / Device Role / Timing Role: Primary synchronous buck regulator providing regulated 3.3V at up to 2A with <2.5µA IQ at 150°C junction. Use Value: Enables continuous radar operation during vehicle sleep mode; meets AEC-Q100 Grade 1 and CISPR25 Class 5 without added filtering. |
Use Scenario: Supplies core logic voltage to SoC and display controller in automotive head units, where EMI-sensitive audio and RF circuits coexist. IC Role / Device Role / Timing Role: Fixed-output buck converter delivering low-noise 3.3V with spread-spectrum modulation to suppress conducted emissions. Use Value: Eliminates need for shielded inductors or ferrite beads; reduces BOM count and PCB area by 30% versus legacy solutions. |
| eCall Telematics Module | Body Control Module (BCM) Microcontroller Rail |
|
Use Scenario: Provides always-on 3.3V supply to cellular modem and GPS receiver in emergency call systems, surviving 15-year battery-backed operation. IC Role / Device Role / Timing Role: Ultra-low-IQ buck converter with precision enable threshold and hiccup-mode overcurrent protection. Use Value: Achieves <1.5µA shutdown current - extends backup battery life beyond 10 years while maintaining fast wake-up response. |
Use Scenario: Powers 32-bit microcontroller and CAN transceivers in door modules and lighting controllers exposed to wide ambient temperature swings. IC Role / Device Role / Timing Role: Automotive-grade buck regulator supporting cold-crank (3V) and hot-idle (36V) conditions with robust thermal shutdown. Use Value: Operates continuously from –40°C to +150°C; withstands repeated 42V load dumps without latch-off or parameter drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar automotive buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR43620MSC5RPERQ1 | Fixed 5V output instead of 3.3V; identical package, pinout, and feature set including spread spectrum and MODE/SYNC. | Used where system requires 5V logic rail instead of 3.3V; no change to PCB layout or thermal design required. | Select when target output voltage is 5V; shares same qualification, reliability data, and production lot traceability. |
| LMR43620RS3QRPERQ1 | Adjustable switching frequency (200kHz–2.2MHz via RT resistor); no spread spectrum; same 3.3V fixed output and 2A rating. | Suitable for noise-sensitive applications requiring precise frequency placement outside sensitive bands, but lacks CISPR25 Class 5 certification. | Choose when EMI requirements are less stringent and frequency tuning is prioritized over guaranteed Class 5 compliance. |
Compared with LMR43620MSC3RPERQ1, LMR43620MSC5RPERQ1 offers identical performance except for output voltage, making it a drop-in alternative for 5V systems; LMR43620RS3QRPERQ1 trades spread spectrum for frequency adjustability, reducing EMI mitigation assurance but increasing design flexibility.
Availability
LMR43620MSC3RPERQ1 is available at Aetrix Electronics and suitable for advanced driver assistance systems (radar ECU), infotainment head units, and eCall telematics modules requiring stable component supply across extended automotive temperature and lifetime requirements.
Supply support for LMR43620MSC3RPERQ1 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 automotive power management ICs and functional safety solutions.
The LMR436x0-Q1 product line was designed specifically for space-constrained, high-reliability automotive subsystems-delivering ultra-low quiescent current, CISPR25-compliant EMI performance, and AEC-Q100 Grade 1 operation in the smallest possible footprint.
FAQ
What is the maximum junction temperature rating for LMR43620MSC3RPERQ1?
The LMR43620MSC3RPERQ1 is rated for continuous operation from –40°C to +150°C junction temperature, with thermal shutdown triggering at 158–186°C. This Grade 1 AEC-Q100 qualification enables placement in under-hood environments such as radar ECUs and BCMs where ambient temperatures exceed 125°C.
Does LMR43620MSC3RPERQ1 support external frequency synchronization?
Yes, LMR43620MSC3RPERQ1 supports external clock synchronization via its MODE/SYNC pin, which implements an in-phase PLL lock to an external signal between 0.2MHz and 2.5MHz. When synchronized, the device remains in FPWM mode and maintains full regulation without frequency foldback.
What is the output voltage accuracy of LMR43620MSC3RPERQ1 over temperature and line?
LMR43620MSC3RPERQ1 delivers 3.3V output with ±0.9% accuracy (3.27V to 3.33V) across the full input range (3.6V–36V) and temperature range (–40°C to +150°C) in FPWM mode. This tight regulation eliminates need for post-regulation LDOs in most automotive applications.
How does the MODE/SYNC pin configure light-load operation on LMR43620MSC3RPERQ1?
On LMR43620MSC3RPERQ1, the MODE/SYNC pin selects between three modes: logic-high (>1.6V) enables FPWM, logic-low (<1V) enables auto (PFM) mode, and a valid external clock signal enables synchronization. This eliminates external mode-control circuitry and simplifies multi-rail power sequencing.
Is LMR43620MSC3RPERQ1 qualified to CISPR25 Class 5 EMI standards?
Yes, LMR43620MSC3RPERQ1 meets CISPR25 Class 5 radiated and conducted emissions requirements out-of-the-box, achieved through integrated dual random spread spectrum, optimized HotRod™ pinout, and low-EMI package construction-no additional filtering or shielding is required for compliance.
LMR43620MSC3RPERQ1 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:
- 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)
LMR43620MSC3RPERQ1 FAQ
1.How can I place an order for LMR43620MSC3RPERQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR43620MSC3RPERQ1 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 LMR43620MSC3RPERQ1 reliable?
The price and inventory of LMR43620MSC3RPERQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR43620MSC3RPERQ1 is usually 5 days.
3.What payment methods are accepted for LMR43620MSC3RPERQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR43620MSC3RPERQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR43620MSC3RPERQ1?
LMR43620MSC3RPERQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR43620MSC3RPERQ1 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 LMR43620MSC3RPERQ1?
For technical support, including LMR43620MSC3RPERQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR43620MSC3RPERQ1 requirements.
6.How does Aetrix verify that LMR43620MSC3RPERQ1 is sourced from the original manufacturer or authorized distributors?
All LMR43620MSC3RPERQ1 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 LMR43620MSC3RPERQ1 meets industry standards.
7.What is the process for return or replacement of LMR43620MSC3RPERQ1?
All LMR43620MSC3RPERQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMR43620MSC3RPERQ1, 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 LMR43620MSC3RPERQ1 part is unused and in its original packaging.
Return procedure for LMR43620MSC3RPERQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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