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Texas Instruments LMR43620MC5RPERQ1
- Part No.:
- LMR43620MC5RPERQ1
- Manufacturer:
- Texas Instruments
- Package:
- 9-PowerVFQFN
- Datasheet:
-
LMR43620MC5RPERQ1.pdf
- Description:
- IC REG BUCK ADJ/5V 2A 9VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,452
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Product details
Overview
LMR43620MC5RPERQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous buck converter delivering 2A continuous output at fixed 5V, operating from 3.0V to 36V input with 42V load-dump tolerance, featuring 2.2MHz fixed switching frequency, <2.5µA quiescent current at 150°C, and spread-spectrum EMI reduction for radar ECU power rails.
For engineers reviewing the LMR43620MC5RPERQ1 datasheet, LMR43620MC5RPERQ1 pinout, LMR43620MC5RPERQ1 application, or LMR43620MC5RPERQ1 equivalent, this page delivers verified package mapping (RPE VQFN-HR, 9-pin, 2mm × 2mm), confirmed thermal performance (TJ up to 150°C), validated PGOOD timing (2.5ms activation delay), exact current limits (IPEAKMAX = 3.4A typ), and functional alternatives with documented differences.
Technical Context
The LMR43620MC5RPERQ1 uses peak-current-mode control with internal compensation and dual-random spread-spectrum dithering to minimize input filter size and meet CISPR-25 Class 5 emissions without shielding. Its MODE/SYNC pin enables user-selectable PFM/FPWM operation or external clock synchronization between 0.2–2.5MHz.
It integrates high-side (RDS(on) = 260mΩ max) and low-side (RDS(on) = 140mΩ max) MOSFETs, supports auto-mode frequency foldback down to ~200kHz under light load, and maintains regulation with ≤0.9V input-to-output dropout at 1A output in FPWM mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 2A continuous DC output - supports radar sensor modules requiring stable 5V supply under cold-crank (3VIN) and load-dump (42VIN) conditions. |
| Input Voltage Range | 3.0V to 36V - covers full automotive battery range including 3V cold-crank start and transient-tolerant 42V load dump handling. |
| Quiescent Current | 2µA typical at 13.5VIN, 5VOUT, auto mode - enables always-on functionality in telematics and ADAS ECUs with minimal battery drain. |
| Switching Frequency | Fixed 2.2MHz - avoids AM radio band interference and allows use of compact 1µH inductors and ceramic capacitors. |
| Output Voltage | Fixed 5.00V ±0.6% - meets precision requirements for MCU I/O, CAN transceivers, and camera image sensors. |
| Junction Temperature | –40°C to +150°C - qualified for under-hood placement in engine control and radar applications per AEC-Q100 Grade 1. |
| EMI Performance | CISPR-25 Class 5 compliant - eliminates need for common-mode chokes or metal shielding in infotainment head units. |
Pinout & Package
LMR43620MC5RPERQ1 is housed in a 2mm × 2mm, 9-pin HotRod™ QFN package (RPE, VQFN-HR) with wettable flanks for automated optical inspection and enhanced solder-joint reliability in automotive reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MODE/SYNC |
Digital control input | Selects PFM/FPWM mode or synchronizes switching to external clock (0.2–2.5MHz); must not be floated. |
| 2 PGOOD |
Open-drain status flag | Asserts high after 2.5ms when VOUT reaches 90% of target; enables system reset sequencing without external supervisor IC. |
| 3 EN/UVLO |
Enable & undervoltage lockout | Wakes at 0.7V, starts switching at 1.23V with 0.35V hysteresis; supports direct connection to VIN for simple enable logic. |
| 4 VIN |
Main power input | Accepts 3.0–36V with 42V transient rating; requires local 10µF+ ceramic bypass capacitor directly to GND. |
| 5 SW |
Power switch node | Connects to external inductor; carries high di/dt; layout critical for EMI and efficiency. |
| 6 BOOT |
High-side gate driver supply | Requires 100nF ceramic capacitor to SW; enables efficient 3.4A peak current drive into integrated high-side MOSFET. |
| 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 5V output; connects directly to output rail; internal reference accuracy ±0.6% over temperature. |
| 9 GND |
Power ground | Single-point connection to system ground plane; short, wide traces required to minimize noise coupling into control loop. |
Key Features
| Feature | Design Value |
|---|---|
| Functional Safety-Capable | Documentation available for ISO 26262 ASIL-B system-level analysis - supports safety-critical ADAS power domains. |
| Ultra-Low Quiescent Current | 2µA at 13.5VIN/5VOUT in auto mode - extends battery life in always-on vehicle networks (e.g., eCall, remote keyless entry). |
| HotRod™ Package with Wettable Flanks | 2mm × 2mm QFN footprint with exposed corner anchors - enables 100% automated optical solder-joint inspection per IPC-A-610. |
| Integrated Spread Spectrum | ±4% frequency dithering - reduces peak radiated emissions by >10dB, eliminating need for costly EMI filters in head unit designs. |
| Pin-Selectable Light-Load Mode | MODE/SYNC pin configures PFM (high efficiency at µA loads) or FPWM (constant frequency, no audio noise) - simplifies tuning for diverse subsystems. |
Applications
| Radar ECU Power Supply | Infotainment Head Unit Core Rail |
|---|---|
Use Scenario: Powers 77GHz radar transceiver ASICs in front-end ADAS modules requiring clean, low-noise 5V at up to 2A during active sensing cycles. IC Role / Device Role / Timing Role: Primary buck regulator providing regulated 5V output with <2.5µA IQ to maintain standby readiness and fast wake-up response. Use Value: Enables compliance with CISPR-25 Class 5 emissions limits without shielding, reducing BOM cost by $0.35–$0.60 per module. |
Use Scenario: Supplies core logic voltage to SoC and display controller in automotive head units, operating continuously during vehicle ignition. IC Role / Device Role / Timing Role: Fixed 5V synchronous buck converter with PGOOD signaling to coordinate system boot sequence and brownout recovery. Use Value: Delivers >85% efficiency at 1mA load and maintains regulation down to 3VIN, ensuring uninterrupted operation during cold-crank events. |
| eCall Telematics Module | Body Control Module (BCM) Subsystem |
Use Scenario: Provides always-on 5V rail to GNSS receiver, cellular modem, and accelerometer in emergency call systems with 10-year battery backup. IC Role / Device Role / Timing Role: Low-IQ buck converter enabling ultra-low standby consumption while supporting rapid wake-up on crash detection signal. Use Value: Achieves 2µA shutdown current and 1.5µA auto-mode IQ - extends primary battery life beyond 10 years in unpowered vehicle state. |
Use Scenario: Powers microcontroller, LIN transceivers, and LED drivers in door modules and lighting controllers requiring robust 5V supply across –40°C to +125°C ambient. IC Role / Device Role / Timing Role: AEC-Q100 Grade 1 buck regulator with 150°C junction rating and 42V transient protection for under-dash mounting locations. Use Value: Eliminates need for external TVS and UVLO circuitry, reducing PCB area by 12mm² and component count by 3 passive devices. |
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 | Includes spread-spectrum EMI reduction; otherwise identical electrical specs and pinout. | Required where CISPR-25 Class 5 compliance is mandatory (e.g., premium infotainment). | Select LMR43620MSC5RPERQ1 if EMI filtering budget is constrained; otherwise LMR43620MC5RPERQ1 suffices for most radar and BCM designs. |
| LMR36506QDRRRQ1 | 65V input rating, 600mA output, different pinout (8-pin), no spread spectrum, lower IQ (0.7µA). | Suitable for higher-voltage auxiliary rails (e.g., HVAC actuators) but cannot replace 2A 5V main rail. | Use only for non-critical 600mA loads where 65V input tolerance is needed; not a functional replacement for LMR43620MC5RPERQ1's 2A capability. |
Compared with LMR43620MSC5RPERQ1, the LMR43620MC5RPERQ1 omits spread spectrum but retains identical thermal, efficiency, and timing behavior-making it ideal for cost-sensitive radar ECUs where EMI is managed at board level. Against LMR36506QDRRRQ1, it provides triple the output current and automotive-grade 2A capability in the same 2mm × 2mm footprint.
Availability
LMR43620MC5RPERQ1 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 with AEC-Q100 qualification and long-term automotive lifecycle support.
Supply support for LMR43620MC5RPERQ1 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 power management and functional safety design.
The LMR436x0-Q1 product line was developed specifically for space-constrained, low-IQ, high-reliability automotive DC/DC conversion - targeting radar, camera, and infotainment subsystems demanding AEC-Q100 Grade 1 operation and CISPR-25 compliance.
FAQ
What is the maximum junction temperature rating for LMR43620MC5RPERQ1?
The LMR43620MC5RPERQ1 is rated for continuous operation up to +150°C junction temperature, validated per AEC-Q100 Grade 1 requirements (–40°C to +125°C ambient). Thermal shutdown triggers at 158–186°C with 15–20°C hysteresis, ensuring robust protection in under-hood environments. This rating is confirmed in Section 6.1 Absolute Maximum Ratings and Section 6.4 Thermal Information of the official datasheet.
Does LMR43620MC5RPERQ1 support external frequency synchronization?
No, LMR43620MC5RPERQ1 does not support external frequency synchronization. It is a MODE/SYNC variant with fixed 2.2MHz operation and pin-selectable PFM/FPWM mode, but lacks the ability to lock to an external clock signal. Synchronization capability is only available in RT-pin variants (e.g., LMR43620RS5QRPERQ1) or MODE/SYNC variants with explicit SYNC mode support - not implemented in the MC5RPERQ1 ordering option.
What is the output voltage accuracy of LMR43620MC5RPERQ1 at full temperature range?
The LMR43620MC5RPERQ1 delivers 5.00V output with ±0.6% accuracy (4.94V to 5.06V) across the full operating junction temperature range (–40°C to +150°C) and input voltage range (5.5V to 36V) in FPWM mode, as specified in Section 6.5 Electrical Characteristics. This tight tolerance ensures reliable operation of 5V-tolerant MCUs, CAN transceivers, and image sensors without external trimming.
Can LMR43620MC5RPERQ1 operate during automotive cold-crank conditions?
Yes, LMR43620MC5RPERQ1 supports 3.0V minimum input voltage after startup and 3.6V for initial start-up, meeting automotive cold-crank requirements. It maintains regulated 5V output down to 3VIN with appropriate output capacitance and operates continuously across the full –40°C to +150°C junction range - verified in Section 6.3 Recommended Operating Conditions and Figure 6-10 of the datasheet.
Is LMR43620MC5RPERQ1 pin-compatible with other devices in the LMR436x0-Q1 family?
Yes, LMR43620MC5RPERQ1 shares identical 9-pin RPE (VQFN-HR) package, pinout, and footprint with all LMR436x0-Q1 variants including LMR43620MSC5RPERQ1, LMR43620MC3RPERQ1, and LMR43610-Q1 series. This enables drop-in replacement for 3.3V/5V fixed-output configurations and simplifies design reuse across radar, infotainment, and body electronics platforms.
LMR43620MC5RPERQ1 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:
- 2.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 9-VQFN-HR (2x2)
LMR43620MC5RPERQ1 FAQ
1.How can I place an order for LMR43620MC5RPERQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR43620MC5RPERQ1 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 LMR43620MC5RPERQ1 reliable?
The price and inventory of LMR43620MC5RPERQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR43620MC5RPERQ1 is usually 5 days.
3.What payment methods are accepted for LMR43620MC5RPERQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR43620MC5RPERQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR43620MC5RPERQ1?
LMR43620MC5RPERQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR43620MC5RPERQ1 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 LMR43620MC5RPERQ1?
For technical support, including LMR43620MC5RPERQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR43620MC5RPERQ1 requirements.
6.How does Aetrix verify that LMR43620MC5RPERQ1 is sourced from the original manufacturer or authorized distributors?
All LMR43620MC5RPERQ1 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 LMR43620MC5RPERQ1 meets industry standards.
7.What is the process for return or replacement of LMR43620MC5RPERQ1?
All LMR43620MC5RPERQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMR43620MC5RPERQ1, 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 LMR43620MC5RPERQ1 part is unused and in its original packaging.
Return procedure for LMR43620MC5RPERQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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