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Texas Instruments LMR43606RS3RPERQ1
- Part No.:
- LMR43606RS3RPERQ1
- Manufacturer:
- Texas Instruments
- Package:
- 9-PowerVFQFN
- Datasheet:
-
LMR43606RS3RPERQ1.pdf
- Description:
- IC REG BUCK ADJ/1V 600MA 9VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,563
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Product details
Overview
LMR43606RS3RPERQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous buck converter delivering 0.6A output at fixed 3.3V, operating from 3.0V to 36V input with 42V load-dump tolerance, featuring <2.5µA quiescent current at 150°C TJMAX and dual random spread spectrum for ultra-low EMI in ADAS radar ECUs.
For engineers reviewing the LMR43606RS3RPERQ1 datasheet, LMR43606RS3RPERQ1 pinout, LMR43606RS3RPERQ1 application, or LMR43606RS3RPERQ1 equivalent, key selection criteria include its RT-pin-adjustable switching frequency (200kHz–2.2MHz), PFM/FPWM auto-mode transition, 2mm × 2mm HotRod™ QFN package with wettable flanks, integrated compensation, and functional safety documentation support.
Technical Context
The LMR43606RS3RPERQ1 uses peak current mode control with frequency foldback below 1mA load to achieve 1.5µA no-load input current at 13.5VIN, enabling always-on automotive operation. Its dual random spread spectrum reduces peak EMI emissions while maintaining constant-frequency FPWM capability via MODE/SYNC pin logic.
It integrates high-side (132mΩ typ) and low-side (75mΩ typ) MOSFETs, supports 95% duty cycle for low-dropout regulation, and features precision enable thresholds (VEN-VOUT = 1.23V ±70mV) with 300mV hysteresis for robust cold-crank startup under 3V VIN.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0V to 36V continuous, supports 42V transients - enables direct connection to automotive battery with load-dump immunity. |
| Output Voltage | Fixed 3.3V ±1% - eliminates external feedback resistors and simplifies layout for noise-sensitive digital domains. |
| Quiescent Current | <2.5µA at TJ = 150°C - ensures compliance with ISO 16750-2 standby power requirements for always-on modules. |
| Switching Frequency | Adjustable 200kHz–2.2MHz via RT resistor - avoids AM band interference and enables optimization of size vs. efficiency. |
| Efficiency | >85% at 1mA load - sustains high light-load efficiency critical for infotainment system sleep modes. |
| Junction Temp Range | –40°C to +150°C - meets AEC-Q100 Grade 1 requirements for under-hood and radar ECU placement. |
| Package | 2mm × 2mm VQFN-HR (RPE), 9-pin HotRod™ with wettable flanks - enables automated optical inspection and high thermal reliability on 4-layer PCBs. |
Pinout & Package
The LMR43606RS3RPERQ1 is housed in a 2mm × 2mm, 9-pin VQFN-HR (RPE) HotRod™ package with wettable flanks and corner anchor pins for enhanced solder joint reliability in automotive thermal cycling.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RT | Frequency setting input | Connects to resistor-to-GND to set switching frequency from 200kHz to 2.2MHz; not used for synchronization. |
| 2 - PGOOD | Open-drain power-good flag | Signals valid output after soft-start (2.5ms delay); requires external pull-up; supports reset supervisor elimination. |
| 3 - EN/UVLO | Enable and undervoltage lockout | Starts regulation when >1.23V; shuts down below 0.93V; supports direct VIN connection for cold-crank operation down to 3V. |
| 4 - VIN | Main power input | Accepts 3.0–36V; handles 42V transients; requires local ceramic bypass capacitor directly 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 | Requires 100nF ceramic capacitor to SW; enables high-side gate drive; UVLO threshold at 2.1V relative to SW. |
| 7 - VCC | Internal LDO output | 3.3V internal 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 regulated rail; FB input leakage <10nA ensures accuracy. |
| 9 - GND | Power ground | Primary return path for high-current loops; must be connected to CIN with short, wide traces per layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| Functional Safety Documentation | Available FIT data, FMEA reports, and safety analysis files - accelerates ASIL-B system-level FMEDA without custom qualification effort. |
| Dual Random Spread Spectrum | Reduces peak EMI by up to 10dB across 150kHz–108MHz - eliminates need for common-mode chokes in compact ADAS modules. |
| Auto Mode with Frequency Foldback | Transitions seamlessly from PWM to PFM below ~10mA; achieves 1.5µA no-load IQ at 13.5VIN - extends battery life in parked vehicle scenarios. |
| HotRod™ Package with Wettable Flanks | Enables 100% automated optical inspection of solder joints and improves thermal resistance (RθJB = 26.1°C/W) - critical for under-hood reliability. |
| Integrated Compensation | Eliminates external Type-II/III compensation network - reduces BOM count by ≥4 components and design validation time. |
Applications
| Advanced Driver Assistance Systems (ADAS) | Infotainment & Digital Cluster |
|---|---|
Use Scenario: Powering 77GHz radar sensor front-end ASICs requiring stable 3.3V at ≤0.6A with ultra-low standby current during vehicle sleep mode. IC Role / Device Role / Timing Role: Primary DC/DC regulator supplying core logic and ADC reference rails; maintains regulation during 3V cold-crank and 42V load dump events. Use Value: 1.5µA no-load IQ and 150°C TJMAX ensure uninterrupted radar operation in extreme ambient conditions without thermal derating. | Use Scenario: Supplying microcontroller, display interface, and audio codec in head unit systems where EMI must avoid FM radio band (76–108MHz). IC Role / Device Role / Timing Role: Secondary buck converter generating clean 3.3V domain; synchronized via MODE/SYNC pin to avoid beat frequencies with main SoC clock. Use Value: Dual random spread spectrum and adjustable FSW (200kHz–2.2MHz) suppress peak emissions below CISPR 25 Class 5 limits without shielding. |
| Body Control Module (BCM) | eCall Telematics Unit |
Use Scenario: Regulating power for LIN gateway, LED drivers, and door module MCUs in centralized body electronics architecture. IC Role / Device Role / Timing Role: Always-on buck converter supporting wake-on-LIN functionality; enabled via precision EN threshold (1.23V ±70mV) for reliable cold-crank detection. Use Value: –40°C to +150°C operation and AEC-Q100 Grade 1 qualification guarantee long-term reliability in engine bay proximity mounting. | Use Scenario: Providing backup power to GPS, cellular modem, and accelerometer during crash-triggered emergency call activation. IC Role / Device Role / Timing Role: Fault-tolerant 3.3V supply with PGOOD monitoring and thermal shutdown (168°C trip); supports safe shutdown before battery disconnect. Use Value: Integrated PGOOD with 2.5ms assertion delay and hiccup-mode protection (30–75ms retry) prevent false resets during transient overloads. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR43606MSC3RPERQ1 | Fixed 2.2MHz switching frequency; MODE/SYNC pin enables external synchronization and PFM/FPWM selection. | Suitable for systems requiring deterministic timing alignment across multiple rails (e.g., multi-camera ADAS). | Select when precise frequency locking or multi-rail synchronization is required; LMR43606RS3RPERQ1 offers wider FSW adjustability but no sync capability. |
| LMR36506QDRRQ1 | 65V max input, 1A output, same 2mm × 2mm HotRod™ package; lacks spread spectrum and functional safety documentation. | Better suited for 48V mild-hybrid architectures or higher-current body electronics loads. | Choose for higher input voltage margin or increased current headroom; LMR43606RS3RPERQ1 provides superior EMI performance and safety certification support. |
Compared with LMR43606MSC3RPERQ1, LMR43606RS3RPERQ1 trades synchronization capability for broader frequency tuning range and lower EMI via dual spread spectrum. Against LMR36506QDRRQ1, it delivers tighter output accuracy (±1% vs. ±2%), certified functional safety assets, and optimized light-load efficiency for always-on use cases.
Availability
LMR43606RS3RPERQ1 is available at Aetrix Electronics and suitable for advanced driver assistance systems, infotainment head units, and body control modules requiring stable component supply across automotive production lifecycles.
Supply support for LMR43606RS3RPERQ1 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-grade power management ICs.
The LMR43606-Q1 product line was developed specifically for AEC-Q100-compliant, low-EMI, always-on automotive power supplies - targeting radar sensors, digital clusters, and telematics where ultra-low IQ, thermal robustness, and functional safety readiness are mandatory.
FAQ
What is the maximum junction temperature rating for the LMR43606RS3RPERQ1?
The LMR43606RS3RPERQ1 has a maximum junction temperature (TJMAX) of +150°C, validated per AEC-Q100 Grade 1 requirements for operation from –40°C to +125°C ambient. Its thermal shutdown trips at 168°C typical, with 20°C hysteresis, ensuring safe operation in under-hood environments. This rating is confirmed in Section 6.1 Absolute Maximum Ratings and Section 6.6 System Characteristics of the official datasheet.
Does the LMR43606RS3RPERQ1 support external frequency synchronization?
No, the LMR43606RS3RPERQ1 does not support external frequency synchronization. It uses the RT pin for adjustable switching frequency (200kHz–2.2MHz) and lacks the MODE/SYNC pin functionality found in variants like LMR43606MSC3RPERQ1. The datasheet explicitly states this part is "No (default PFM at light load)" for external SYNC in the Device Comparison Table (Section 4), and Pin 1 is designated solely as RT, not MODE/SYNC.
What is the typical quiescent current of the LMR43606RS3RPERQ1 at no load and 13.5V input?
The LMR43606RS3RPERQ1 draws 1.5µA typical input current at no load and 13.5V input in Auto mode, as specified in Section 6.6 System Characteristics (IQVIN = 1.5µA). This value is measured under recommended operating conditions (–40°C to +150°C junction temperature) and reflects its optimized light-load efficiency for always-on automotive applications such as radar ECUs and eCall modules.
How is the output voltage configured on the LMR43606RS3RPERQ1?
The LMR43606RS3RPERQ1 is factory-configured for fixed 3.3V output. Pin 8 (VOUT/FB) connects directly to the output rail - no external feedback resistors are required. Output voltage accuracy is ±1% (3.27V to 3.33V) across input range and temperature, as verified in Section 6.5 Electrical Characteristics. This fixed configuration reduces BOM cost and layout complexity versus adjustable variants.
What package type and dimensions does the LMR43606RS3RPERQ1 use?
The LMR43606RS3RPERQ1 uses a 2mm × 2mm, 9-pin VQFN-HR (RPE) HotRod™ package with wettable flanks, as documented in Section 11 Mechanical, Packaging, and Orderable Information. Its nominal footprint is 4mm², and corner anchor pins enhance solder joint reliability during automotive thermal cycling. This package enables AOI-compatible assembly and achieves RθJB = 26.1°C/W on standard 4-layer PCBs.
LMR43606RS3RPERQ1 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:
- 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)
LMR43606RS3RPERQ1 FAQ
1.How can I place an order for LMR43606RS3RPERQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR43606RS3RPERQ1 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 LMR43606RS3RPERQ1 reliable?
The price and inventory of LMR43606RS3RPERQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR43606RS3RPERQ1 is usually 5 days.
3.What payment methods are accepted for LMR43606RS3RPERQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR43606RS3RPERQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR43606RS3RPERQ1?
LMR43606RS3RPERQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR43606RS3RPERQ1 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 LMR43606RS3RPERQ1?
For technical support, including LMR43606RS3RPERQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR43606RS3RPERQ1 requirements.
6.How does Aetrix verify that LMR43606RS3RPERQ1 is sourced from the original manufacturer or authorized distributors?
All LMR43606RS3RPERQ1 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 LMR43606RS3RPERQ1 meets industry standards.
7.What is the process for return or replacement of LMR43606RS3RPERQ1?
All LMR43606RS3RPERQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMR43606RS3RPERQ1, 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 LMR43606RS3RPERQ1 part is unused and in its original packaging.
Return procedure for LMR43606RS3RPERQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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