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Texas Instruments LMR43606RS5RPERQ1
- Part No.:
- LMR43606RS5RPERQ1
- Manufacturer:
- Texas Instruments
- Package:
- 9-PowerVFQFN
- Datasheet:
-
LMR43606RS5RPERQ1.pdf
- Description:
- IC REG BUCK ADJ/1V 600MA 9VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,754
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Product details
Overview
LMR43606RS5RPERQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous buck converter delivering 0.6A output at fixed 5V, operating from 3.0V to 36V input with 42V load-dump tolerance, featuring <2.5µA quiescent current at 150°C TJMAX and integrated spread spectrum for ultra-low EMI in ADAS radar ECUs.
For engineers reviewing the LMR43606RS5RPERQ1 datasheet, LMR43606RS5RPERQ1 pinout, LMR43606RS5RPERQ1 application, or LMR43606RS5RPERQ1 equivalent, this page delivers verified technical context, validated pin functions, confirmed thermal and efficiency specs across –40°C to +150°C, and real-world automotive selection guidance - not generic DC/DC claims.
Technical Context
The LMR43606RS5RPERQ1 uses peak-current-mode control with frequency foldback in Auto mode, enabling 1.5µA no-load IQ at 13.5VIN while maintaining seamless PWM/PFM transition. Its dual-random spread spectrum reduces peak EMI emissions without external filters.
This RT-pin variant supports adjustable switching frequency from 200kHz to 2.2MHz via external resistor, operates with internal compensation, and integrates high-side (132–260mΩ) and low-side (75–140mΩ) MOSFETs in a wettable-flank HotRod QFN package optimized for optical inspection and solder-joint reliability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0V to 36V continuous; withstands 42V transients - supports automotive cold-crank (3V) and load-dump conditions. |
| Output Voltage | Fixed 5.00V ±0.6% (4.94–5.06V) over full temperature and line range - eliminates external feedback resistors. |
| Quiescent Current | 2.0µA typical at VIN=13.5V, VOUT=5V, IOUT=0A, Auto mode - enables always-on functionality in battery-sensitive systems. |
| Switching Frequency | Adjustable 200kHz–2.2MHz via RT pin resistor - avoids noise-sensitive bands and enables layout optimization. |
| Junction Temperature | –40°C to +150°C operational range - qualified per AEC-Q100 Grade 1 with 158–186°C thermal shutdown. |
| Package | RPE (VQFN-HR, 9-pin), 2mm × 2mm with wettable flanks - enables automated optical inspection and robust board-level reliability. |
| EMI Reduction | Dual-random spread spectrum (±4% ΔFc) - reduces peak radiated emissions without shielding or common-mode chokes. |
Pinout & Package
RPE package: 9-pin, 2mm × 2mm Very-thin Quad Flat No-lead with HotRod™ construction and wettable flanks for solder-joint inspection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RT | Frequency-setting input | Connect external resistor to GND to set FSW from 200kHz to 2.2MHz; not used for MODE/SYNC variants. |
| 2 - PGOOD | Open-drain power-good flag | Asserts high when VOUT is within ±4.2% regulation window; includes 25–75µs deglitch and 1.35–4ms activation delay. |
| 3 - EN/UVLO | Enable and undervoltage lockout | Active-high enable with precision thresholds: wake at 0.5V, start at 1.23V, hysteresis 0.35V - supports direct VIN connection. |
| 4 - VIN | Main power input | Accepts 3.0–36V; handles 42V transients; requires local high-quality bypass capacitor to GND. |
| 5 - SW | Switch node | Connects to power inductor; carries high di/dt; must be routed with minimal loop area to reduce EMI. |
| 6 - BOOT | Bootstrap supply | 100nF capacitor to SW provides gate drive voltage for high-side MOSFET; critical for proper HS turn-on. |
| 7 - VCC | Internal LDO output | 3.3V ±3% regulated supply for control circuitry; decouple with 1µF ceramic to GND; not for external loads. |
| 8 - VOUT/FB | Output voltage sense / feedback | Fixed 5V configuration - connect directly to output node; no external divider required. |
| 9 - GND | Power ground | Primary return path; connect to CIN with short, wide traces to minimize impedance and improve EMI performance. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C ambient operation with 150°C max junction temperature - meets automotive system-level thermal requirements. |
| Ultra-low quiescent current | 2.0µA typical at 13.5VIN, 5VOUT, 0A load - extends battery life in always-on modules like eCall and radar standby modes. |
| Integrated spread spectrum | ±4% frequency dithering reduces peak EMI by >10dB - eliminates need for external EMI filters in compact ADAS layouts. |
| Thermal robustness | 158–186°C thermal shutdown with 15–20°C hysteresis - protects against sustained overload or poor heatsinking in sealed enclosures. |
| Pin-compatible scalability | Shares footprint and pinout with LMR43610-Q1 (1A) and LMR36506-Q1 (65V/600mA) - simplifies power-stage upgrades across vehicle platforms. |
Applications
| Advanced Driver Assistance Systems (ADAS) | Infotainment & Digital Cluster |
|---|---|
Use Scenario: Powering 77GHz radar sensor modules requiring stable 5V supply during vehicle ignition-off monitoring. IC Role / Device Role / Timing Role: Primary 5V buck regulator supplying FPGA, MCU, and RF front-end with <2.5µA IQ to meet ISO 16750-2 battery drain limits. Use Value: Enables 15-year battery-backed operation without compromising radar wake-up latency or EMI compliance in narrow-band automotive bands. |
Use Scenario: Supplying head unit application processor core logic and display interface ICs in infotainment systems. IC Role / Device Role / Timing Role: Secondary 5V rail generator downstream of main 12V system rail, supporting dynamic load steps up to 0.6A with <4ms soft-start. Use Value: Delivers >85% efficiency at 1mA light load and maintains regulation during 42V load-dump transients - prevents system resets during alternator surges. |
| Body Control Module (BCM) | Automotive Lighting Control |
Use Scenario: Providing regulated 5V for LIN gateway microcontrollers and sensor interfaces in door modules and seat controllers. IC Role / Device Role / Timing Role: Always-on power source with precision enable (VEN-VOUT = 1.23V) enabling controlled wake-up from sleep via body network signals. Use Value: Achieves 0.2V dropout at 0.6A (VDROP1) and supports 3V cold-crank start - ensures reliable operation during engine cranking. |
Use Scenario: Powering LED driver ICs and CAN transceivers in adaptive front-lighting systems (AFS). IC Role / Device Role / Timing Role: Isolated 5V supply for digital control section, synchronized via RT pin to avoid interference with PWM dimming frequencies. Use Value: Adjustable FSW (200kHz–2.2MHz) allows clock alignment to avoid beat frequencies with LED switching - eliminates visible flicker in camera-based lighting feedback loops. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar automotive buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR43606RS3RPERQ1 | Same RPE package and RT-pin architecture, but fixed 3.3V output instead of 5V; identical IQ, thermal, and EMI specs. | Used where 3.3V logic rails dominate (e.g., MCU I/O, CAN PHY); not suitable for 5V analog sensors or legacy peripherals. | Select when system requires 3.3V output and shares same PCB layout - drop-in replacement with no layout change. |
| LMR43610RS5RPERQ1 | Pin-compatible 1A version with identical 5V fixed output, same 2mm×2mm RPE package, but higher RDSON-HS (110–220mΩ vs. 132–260mΩ) and 150°C TJMAX. | Required for higher-current loads (>0.6A) such as multi-sensor fusion ECUs; shares same thermal footprint and layout. | Choose for future-proofing or higher load margin; same footprint and enable/PGOOD timing - no redesign needed. |
Compared with LMR43606RS5RPERQ1, the RS3RPERQ1 offers identical performance at 3.3V for logic-centric designs, while the LMR43610RS5RPERQ1 scales current capability to 1A without changing PCB layout - both preserve the same ultra-low EMI architecture and AEC-Q100 qualification.
Availability
LMR43606RS5RPERQ1 is available at Aetrix Electronics and suitable for advanced driver assistance systems, infotainment head units, and body electronics requiring stable component supply with automotive-grade traceability and long-term lifecycle support.
Supply support for LMR43606RS5RPERQ1 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 decades of automotive qualification expertise and functional safety documentation support.
The LMR43606-Q1 product line is designed specifically for automotive power management in space-constrained, thermally demanding environments - targeting radar, camera, and domain controller applications requiring ultra-low IQ and EMI-compliant operation.
FAQ
What is the maximum junction temperature rating for the LMR43606RS5RPERQ1?
The LMR43606RS5RPERQ1 is rated for continuous operation up to +150°C junction temperature, with thermal shutdown triggering between 158°C and 186°C and 15–20°C hysteresis. This specification is validated per AEC-Q100 Grade 1 and supports under-hood deployment in modern automotive ECUs where ambient temperatures exceed 105°C.
Does the LMR43606RS5RPERQ1 require external feedback resistors for 5V output?
No, the LMR43606RS5RPERQ1 features a factory-trimmed fixed 5V output configuration. The VOUT/FB pin is internally connected to the 5.00V reference, so no external feedback resistors are needed - simplifying design, reducing BOM count, and improving accuracy to ±0.6% over temperature and line.
How does the RT pin adjust switching frequency in the LMR43606RS5RPERQ1?
The RT pin on the LMR43606RS5RPERQ1 sets switching frequency by connecting an external resistor between RT and GND. With a 39.2kΩ 0.1% resistor, FSW is 400kHz (±15%); tying RT to VCC yields ~1MHz, and grounding RT sets ~2.2MHz. Frequency accuracy is specified across –40°C to +150°C.
Can the LMR43606RS5RPERQ1 operate during automotive cold-crank conditions?
Yes, the LMR43606RS5RPERQ1 supports input voltages as low as 3.0V after startup and 3.6V for initial start-up, meeting automotive cold-crank requirements. Its low dropout (0.2V at 0.6A) and high-efficiency PFM operation at light loads ensure stable 5V output even when battery voltage dips below 6V during engine cranking.
Is spread spectrum enabled by default on the LMR43606RS5RPERQ1?
Yes, dual-random spread spectrum is factory-enabled and active by default on the LMR43606RS5RPERQ1. It cannot be disabled via pins or registers - this fixed feature reduces peak EMI emissions by spreading energy across a ±4% bandwidth, eliminating the need for external filtering in compact automotive PCBs.
LMR43606RS5RPERQ1 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:
- 600mA
- Frequency - Switching:
- 200kHz ~ 2.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 9-VQFN-HR (2x2)
LMR43606RS5RPERQ1 FAQ
1.How can I place an order for LMR43606RS5RPERQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR43606RS5RPERQ1 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 LMR43606RS5RPERQ1 reliable?
The price and inventory of LMR43606RS5RPERQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR43606RS5RPERQ1 is usually 5 days.
3.What payment methods are accepted for LMR43606RS5RPERQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR43606RS5RPERQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR43606RS5RPERQ1?
LMR43606RS5RPERQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR43606RS5RPERQ1 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 LMR43606RS5RPERQ1?
For technical support, including LMR43606RS5RPERQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR43606RS5RPERQ1 requirements.
6.How does Aetrix verify that LMR43606RS5RPERQ1 is sourced from the original manufacturer or authorized distributors?
All LMR43606RS5RPERQ1 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 LMR43606RS5RPERQ1 meets industry standards.
7.What is the process for return or replacement of LMR43606RS5RPERQ1?
All LMR43606RS5RPERQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMR43606RS5RPERQ1, 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 LMR43606RS5RPERQ1 part is unused and in its original packaging.
Return procedure for LMR43606RS5RPERQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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