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Texas Instruments LMR43620MC3RPERQ1
- Part No.:
- LMR43620MC3RPERQ1
- Manufacturer:
- Texas Instruments
- Package:
- 9-PowerVFQFN
- Datasheet:
-
LMR43620MC3RPERQ1.pdf
- Description:
- IC REG BUCK ADJ/1V 2A 9VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,054
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Product details
Overview
LMR43620MC3RPERQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous buck converter delivering 2A continuous output at fixed 3.3V, featuring 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 domains in radar ECUs and infotainment head units.
For engineers reviewing the LMR43620MC3RPERQ1 datasheet, LMR43620MC3RPERQ1 pinout, LMR43620MC3RPERQ1 application, or LMR43620MC3RPERQ1 equivalent, key selection criteria include ultra-low IQ at high temperature, CISPR25 Class 5 EMI compliance without external filters, fixed-frequency FPWM mode enablement via MODE/SYNC pin, and HotRod™ QFN package compatibility with automated optical inspection.
Technical Context
The LMR43620MC3RPERQ1 employs peak current mode control with internal compensation, enabling stable regulation using minimal output capacitance. Its architecture integrates dual random spread spectrum dithering and a bond-wire-free HotRod™ QFN package to suppress peak EMI emissions below CISPR25 Class 5 limits without common-mode chokes.
This variant uses a fixed 2.2MHz switching frequency and lacks spread spectrum modulation (per Device Comparison Table), while retaining PFM/FPWM mode selection via the MODE/SYNC pin. It supports automotive cold-crank (3VIN) and load-dump (42V transient) conditions, with thermal shutdown set at 158–186°C and recovery hysteresis of 15–20°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 2A continuous DC output - supports full-power operation in ADAS radar modules without derating at 125°C ambient. |
| Input Voltage Range | 3.0V to 36V with 42V transients - sustains regulation during automotive cold-crank (3V) and load-dump events. |
| Quiescent Current | 1.2µA non-switching IQ at 13.5VIN, 3.3VOUT - enables <10µW standby power in always-on vehicle networks. |
| Switching Frequency | Fixed 2.2MHz - avoids AM band interference and allows use of compact 1µH inductors in space-constrained ECUs. |
| Output Voltage | Fixed 3.3V ±0.9% over –40°C to +150°C - meets tight rail tolerance for MCU core supplies in body control modules. |
| Junction Temperature | –40°C to +150°C - qualified for under-hood placement near engine compartments without external heatsinking. |
| EMI Performance | CISPR25 Class 5 compliant - eliminates need for input common-mode chokes or shielded inductors in infotainment systems. |
Pinout & Package
LMR43620MC3RPERQ1 is housed in a 2mm × 2mm VQFN-HR (RPE) package with wettable flanks and corner anchor pins for reliable solder joint inspection and mechanical robustness in automotive vibration environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MODE/SYNC |
Digital control input | Selects PFM/FPWM mode or enables external clock synchronization; must not be floated; logic-high >1.6V enables FPWM. |
| 2 PGOOD |
Open-drain status flag | Asserts high when VOUT is within ±4.2% of target; includes 25–75µs deglitching and 1.35–4ms activation delay. |
| 3 EN/UVLO |
Enable & undervoltage lockout | Starts regulation when voltage exceeds 0.7V; shuts down below 0.5V; supports direct connection to VIN for simple biasing. |
| 4 VIN |
Main power input | Accepts 3.0–36V with 42V transient tolerance; requires local ceramic bypass capacitor directly to GND. |
| 5 SW |
Power switch node | Connects to external inductor; carries high di/dt; layout demands short, wide copper pour to minimize EMI and ringing. |
| 6 BOOT |
High-side gate driver supply | Requires 100nF ceramic capacitor between BOOT and SW to sustain gate drive during HS conduction. |
| 7 VCC |
Internal LDO output | 3.3V ±3% regulated supply for control circuitry; decoupled with 1µF capacitor to GND; not for external loading. |
| 8 VOUT/FB |
Output voltage sense / feedback | Configured as fixed 3.3V output; connects directly to output rail; internal reference accuracy ±0.3% over temperature. |
| 9 GND |
Power ground | Primary return path for high-current loops; must be connected to system ground with low-inductance, wide traces. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ at high temperature | 1.5µA shutdown current at 150°C - enables multi-year battery life in parked vehicle monitoring circuits. |
| Automotive-grade thermal robustness | 150°C max junction temperature with 15–20°C thermal shutdown hysteresis - prevents latch-up during sustained under-hood heat exposure. |
| Integrated power-good signaling | PGOOD with built-in 2.5ms delay and 40µs deglitching - replaces external reset supervisors in telematics modules. |
| Pin-selectable light-load behavior | MODE/SYNC pin toggles between auto (PFM) and forced PWM modes - ensures predictable efficiency vs. load curves in ADAS camera power rails. |
| Optimized for minimal BOM count | Internal compensation and fixed 3.3V output eliminate external feedback resistors and loop compensation components. |
Applications
| Radar ECU Power Supply | Infotainment Head Unit Core Rail |
|---|---|
|
Use Scenario: Powers 77GHz radar SoC in ADAS domain controller requiring stable 3.3V at up to 1.8A with <10µA standby draw during vehicle sleep mode. IC Role / Device Role / Timing Role: Primary synchronous buck regulator supplying core logic voltage; operates in auto mode during idle and switches to FPWM during active chirp transmission. Use Value: 1.2µA IQ at 13.5VIN reduces total system quiescent load by >30% versus legacy buck converters, extending parking-mode battery life. |
Use Scenario: Delivers 3.3V to application processor and display interface in automotive head unit, surviving 42V load-dump transients and cold-crank down to 3V. IC Role / Device Role / Timing Role: Main DC/DC converter for SoC core rail; synchronized to system clock via MODE/SYNC pin to avoid beat frequencies with video timing signals. Use Value: Fixed 2.2MHz operation enables use of 1.0µH shielded inductor, reducing solution size to <100mm² - critical for slim-form-factor dash displays. |
| Body Control Module Subsystem | eCall Telematics Backup Power |
|
Use Scenario: Supplies 3.3V to CAN transceivers, LIN gateways, and LED drivers in centralized body controller operating continuously across full vehicle lifetime. IC Role / Device Role / Timing Role: Always-on power source with integrated UVLO and thermal protection; enables safe brown-out response during battery voltage sag. Use Value: –40°C to +150°C qualification and 84.4°C/W θJA allow direct PCB mounting without heatsink - cuts BOM cost and assembly steps. |
Use Scenario: Provides regulated 3.3V to GNSS receiver and cellular modem in eCall module, maintaining operation during 15-minute post-crash battery backup window. IC Role / Device Role / Timing Role: Secondary regulated rail backed by supercapacitor; leverages ultra-low IQ to maximize hold-up time from stored energy. Use Value: 1.5µA shutdown current extends supercapacitor hold-up duration by 22% compared to 3.5µA alternatives, ensuring regulatory-compliant 15-min alert transmission. |
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 fixed spread spectrum modulation; identical 2.2MHz frequency and 3.3V fixed output. | Better peak EMI suppression in noise-sensitive RF zones (e.g., near radar antennas); same footprint and pinout. | Select when CISPR25 Class 5 margin is insufficient with board-level filtering alone. |
| LMR43620RS3QRPERQ1 | RT-pin variant with adjustable 200kHz–2.2MHz frequency; no MODE/SYNC pin; includes spread spectrum. | Enables frequency tuning to avoid sensitive bands (e.g., AM radio); requires external RT resistor; different pin 1 function. | Choose when system-level EMI testing reveals narrowband peaks that fixed-frequency operation cannot avoid. |
Compared with LMR43620MC3RPERQ1, LMR43620MSC3RPERQ1 adds spread spectrum for enhanced EMI headroom without layout changes, while LMR43620RS3QRPERQ1 trades MODE/SYNC flexibility for frequency tunability - both require review of EN/UVLO threshold alignment and PGOOD timing in safety-critical startup sequences.
Availability
LMR43620MC3RPERQ1 is available at Aetrix Electronics and suitable for advanced driver assistance systems, infotainment head units, and body electronics requiring stable component supply across extended automotive temperature ranges and long production lifecycles.
Supply support for LMR43620MC3RPERQ1 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-certified design flows.
The LMR436x0-Q1 product line was developed specifically for automotive subsystems demanding ultra-low quiescent current, high-temperature reliability, and EMI-robust power conversion - targeting radar, telematics, and digital cockpit applications.
FAQ
What is the maximum junction temperature rating for the LMR43620MC3RPERQ1?
The LMR43620MC3RPERQ1 is rated for continuous operation up to +150°C junction temperature, with thermal shutdown triggering between 158°C and 186°C and recovery hysteresis of 15–20°C. This specification enables direct mounting in high-ambient locations such as engine bays or near power inverters without auxiliary cooling, and is validated per AEC-Q100 Grade 1 requirements for –40°C to +125°C ambient operation.
Does the LMR43620MC3RPERQ1 support spread spectrum modulation?
No, the LMR43620MC3RPERQ1 does not include spread spectrum modulation. Per the Device Comparison Table, only variants with "S" in the orderable suffix (e.g., LMR43620MSC3RPERQ1) feature fixed spread spectrum. The LMR43620MC3RPERQ1 retains all other EMI-reduction features - HotRod™ package, optimized pinout, and dual random dithering is omitted in this specific variant.
How is the output voltage configured on the LMR43620MC3RPERQ1?
The LMR43620MC3RPERQ1 provides a factory-configured fixed 3.3V output. The VOUT/FB pin is internally connected to the 3.3V reference and must be tied directly to the output rail - no external feedback resistors are required or supported. Output voltage accuracy is ±0.9% over –40°C to +150°C, verified in FPWM mode with input ranging from 3.6V to 36V.
What is the minimum input voltage required for startup of the LMR43620MC3RPERQ1?
The LMR43620MC3RPERQ1 requires a minimum input voltage of 3.2V to initiate startup, with a typical rising threshold of 3.35V and hysteresis ensuring reliable turn-on above battery cold-crank conditions. After startup, it sustains regulation down to 3.0V input, supporting operation during deep discharge events in 12V automotive systems.
Can the LMR43620MC3RPERQ1 be synchronized to an external clock?
Yes, the LMR43620MC3RPERQ1 supports external clock synchronization via its MODE/SYNC pin. When a valid clock signal (0.2–2.5MHz) is applied, the device locks its switching frequency to the external source using an internal PLL, maintaining in-phase alignment. During synchronization, it remains in FPWM mode and continues regulating output voltage without interruption or glitch.
LMR43620MC3RPERQ1 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):
- 3.6V
- 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)
LMR43620MC3RPERQ1 FAQ
1.How can I place an order for LMR43620MC3RPERQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR43620MC3RPERQ1 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 LMR43620MC3RPERQ1 reliable?
The price and inventory of LMR43620MC3RPERQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR43620MC3RPERQ1 is usually 5 days.
3.What payment methods are accepted for LMR43620MC3RPERQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR43620MC3RPERQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR43620MC3RPERQ1?
LMR43620MC3RPERQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR43620MC3RPERQ1 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 LMR43620MC3RPERQ1?
For technical support, including LMR43620MC3RPERQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR43620MC3RPERQ1 requirements.
6.How does Aetrix verify that LMR43620MC3RPERQ1 is sourced from the original manufacturer or authorized distributors?
All LMR43620MC3RPERQ1 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 LMR43620MC3RPERQ1 meets industry standards.
7.What is the process for return or replacement of LMR43620MC3RPERQ1?
All LMR43620MC3RPERQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMR43620MC3RPERQ1, 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 LMR43620MC3RPERQ1 part is unused and in its original packaging.
Return procedure for LMR43620MC3RPERQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMR43620MC3RPERQ1 Tags
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