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Texas Instruments LMR43610RS3QRPERQ1
- Part No.:
- LMR43610RS3QRPERQ1
- Manufacturer:
- Texas Instruments
- Package:
- 9-PowerVFQFN
- Datasheet:
-
LMR43610RS3QRPERQ1.pdf
- Description:
- IC REG BUCK ADJ/3.3V 1A 9VQFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LMR43610RS3QRPERQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous buck converter delivering 1A output current, 3.3V fixed output voltage, and ultra-low 1.2µA non-switching quiescent current at 13.5VIN. It operates across 3.0V–36V input range, supports 42V load dump, and integrates peak current mode control in a 2mm × 2mm HotRod™ QFN package for radar ECU and infotainment power rails.
For engineers reviewing the LMR43610RS3QRPERQ1 datasheet, LMR43610RS3QRPERQ1 pinout, LMR43610RS3QRPERQ1 application, or LMR43610RS3QRPERQ1 equivalent, this page delivers verified electrical specs, thermal behavior at 150°C junction, spread-spectrum EMI reduction, RT-pin adjustable switching frequency (200kHz–2.2MHz), and functional safety documentation support - all critical for automotive power supply design validation.
Technical Context
The LMR43610RS3QRPERQ1 uses peak current mode control with internal compensation to minimize output capacitance and enable compact 10mm × 10mm typical designs. Its dual random spread spectrum dithering, HotRod™ package with wettable flanks, and optimized pinout collectively meet CISPR-25 Class 5 EMI requirements without external chokes or shielding.
This RT-pin variant supports frequency adjustment via external resistor (200kHz–2.2MHz), defaults to auto-mode PFM at light loads for 1.5µA unloaded IQ, and features integrated high-side/low-side MOSFETs with 132mΩ/75mΩ RDS(on) at 1A. Thermal shutdown triggers at 158°C–186°C with 15°C–20°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 1A continuous DC output - supports body electronics and always-on ADAS subsystems without derating up to 150°C TJ. |
| Input Voltage Range | 3.0V to 36V with 42V transient tolerance - handles cold-crank (3V) and load-dump (42V) events in 12V/24V automotive systems. |
| Quiescent Current | 1.2µA non-switching IQ at 13.5VIN, 3.3VOUT - enables >10-year battery life in always-on vehicle modules. |
| Switching Frequency | Adjustable 200kHz–2.2MHz via RT pin - avoids AM band interference and enables optimization of inductor size vs. efficiency. |
| Output Voltage Accuracy | ±0.9% over –40°C to +125°C ambient - ensures stable 3.3V rail for MCU, sensor, and CAN transceiver interfaces. |
| EMI Performance | CISPR-25 Class 5 compliant with spread spectrum enabled - eliminates need for common-mode chokes in head unit and radar ECU layouts. |
| Package | 2mm × 2mm VQFN-HR (RPE) with wettable flanks - supports automated optical inspection and robust solder joint reliability per AEC-Q200. |
Pinout & Package
LMR43610RS3QRPERQ1 uses the 9-pin RPE (VQFN-HR) package: 2mm × 2mm body, 0.4mm pitch, wettable flanks, and corner anchor pads for enhanced mechanical reliability in automotive vibration environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RT | Frequency setting input | Connect external resistor to GND to set switching frequency from 200kHz to 2.2MHz; no pull-up/pull-down required. |
| 2 - PGOOD | Open-drain power-good flag | Asserts high after soft-start completion (2.5ms delay); used for system reset sequencing and fault monitoring. |
| 3 - EN/UVLO | Enable and undervoltage lockout | Wakes at 0.5V, starts regulation at 1.23V; supports direct connection to VIN for simple enable control. |
| 4 - VIN | Main input power supply | Accepts 3.0V–36V with 42V transient rating; 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 for high-side driver | Requires 100nF ceramic capacitor between BOOT and SW; critical for gate drive integrity during HS conduction. |
| 7 - VCC | Internal LDO output | 3.3V internal supply for control circuitry; decouple with 1µF ceramic to GND; not for external loading. |
| 8 - VOUT/FB | Output voltage sense / feedback | Configured as fixed 3.3V output; connects directly to regulated output node; no external resistors needed. |
| 9 - GND | Power ground | Primary thermal and current return path; must connect to CIN with short, wide copper traces per layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| Functional Safety Documentation | TI provides FIT data, failure mode analysis, and safety manual - accelerates ISO 26262 ASIL-B system-level certification. |
| Ultra-Low Light-Load Efficiency | 85%+ efficiency at 1mA load due to auto-mode PFM operation and diode emulation - extends battery runtime in parked-state ECUs. |
| Integrated Power Stage | Monolithic high-side (132mΩ) and low-side (75mΩ) MOSFETs eliminate external FETs and drivers - reduces BOM count and layout complexity. |
| Thermal Robustness | Rated for 150°C maximum junction temperature with thermal shutdown at 158°C–186°C - sustains operation in under-hood and headlamp environments. |
| EMI-Optimized Architecture | Dual random spread spectrum + HotRod™ flip-chip + optimized pinout - achieves CISPR-25 Class 5 without ferrite beads or metal shielding. |
Applications
| Radar ECU Power Supply | Infotainment Head Unit Core Rail |
|---|---|
|
Use Scenario: Supplies 3.3V to 77GHz radar processor and signal chain in front-end module. IC Role / Device Role / Timing Role: Primary step-down regulator converting 12V battery to noise-sensitive analog/digital core rail. Use Value: Spread spectrum and low EMI ensure clean power delivery without interfering with RF receive sensitivity or causing false object detection. |
Use Scenario: Powers SoC, display controller, and audio codec in automotive infotainment head unit. IC Role / Device Role / Timing Role: Always-on 3.3V buck converter supporting fast wake-from-sleep and low standby current. Use Value: 1.2µA IQ enables >10-year battery backup for real-time clock and CAN bus monitoring during vehicle sleep mode. |
| ADAS Camera Module | Body Control Module (BCM) Microcontroller Rail |
|
Use Scenario: Provides regulated 3.3V to image sensor, ISP, and MIPI interface in surround-view camera ECU. IC Role / Device Role / Timing Role: High-reliability point-of-load regulator operating across –40°C to +105°C ambient. Use Value: AEC-Q100 Grade 1 qualification and 150°C TJ rating ensure uninterrupted operation in engine bay-mounted camera housings. |
Use Scenario: Delivers 3.3V to microcontroller, LIN transceivers, and LED drivers in door module or lighting control unit. IC Role / Device Role / Timing Role: Compact, cost-optimized buck converter replacing discrete solutions in space-constrained PCBs. Use Value: 2mm × 2mm HotRod™ package with wettable flanks enables 100% automated AOI and high-yield reflow in high-volume BCM production. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR43610MSC3RPERQ1 | Includes MODE/SYNC pin for external clock synchronization and fixed 2.2MHz FSW; no RT resistor needed. | Required where multiple regulators must be synchronized to avoid beat frequencies in multi-rail infotainment systems. | Select when deterministic timing alignment across power rails is mandatory; LMR43610RS3QRPERQ1 is preferred for standalone, cost-sensitive designs. |
| LMR36503RPERQ1 | 65V input rating, 300mA output, same 2mm × 2mm HotRod™ package but lower current capability and no spread spectrum. | Suitable only for low-power sensors or auxiliary rails - cannot replace LMR43610RS3QRPERQ1 in 1A load scenarios. | Choose only for sub-300mA always-on functions like CAN transceiver bias; LMR43610RS3QRPERQ1 remains necessary for primary 1A rails. |
Compared with LMR43610MSC3RPERQ1, LMR43610RS3QRPERQ1 trades synchronization capability for lower BOM cost and simplified layout; versus LMR36503RPERQ1, it delivers triple the output current and certified CISPR-25 Class 5 EMI performance - making it the only validated option for 1A automotive core rails requiring ultra-low IQ and robust EMC compliance.
Availability
LMR43610RS3QRPERQ1 is available at Aetrix Electronics and suitable for advanced driver assistance systems (radar ECU), infotainment head units, and body electronics requiring stable component supply across extended automotive temperature and lifetime requirements.
Supply support for LMR43610RS3QRPERQ1 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, embedded processing, and automotive-grade power management ICs with decades of AEC-Q100 validation expertise.
The LMR436x0-Q1 product line was designed specifically for automotive power rails demanding ultra-low quiescent current, high thermal resilience, and Class 5 EMI compliance - targeting radar, camera, and infotainment subsystems.
FAQ
What is the maximum junction temperature rating for the LMR43610RS3QRPERQ1?
The LMR43610RS3QRPERQ1 is rated for a maximum junction temperature of 150°C and includes thermal shutdown that activates between 158°C and 186°C. This specification enables reliable operation in under-hood and headlamp environments where ambient temperatures exceed 105°C, and is validated per AEC-Q100 Grade 1 requirements across –40°C to +125°C ambient.
Does the LMR43610RS3QRPERQ1 support spread spectrum EMI reduction?
Yes, the LMR43610RS3QRPERQ1 integrates dual random spread spectrum dithering and is certified to meet CISPR-25 Class 5 emission limits. This feature is factory-enabled and requires no external configuration - it works in conjunction with the HotRod™ package and optimized pinout to eliminate the need for common-mode chokes or metal shielding in radar ECU and head unit designs.
How is the switching frequency set on the LMR43610RS3QRPERQ1?
The LMR43610RS3QRPERQ1 uses the RT pin to set switching frequency from 200kHz to 2.2MHz via an external resistor to GND. Unlike MODE/SYNC variants, it does not support external clock synchronization. The RT resistor value determines frequency precisely - for example, a 39.2kΩ 0.1% resistor sets ~400kHz - enabling optimization for efficiency, size, or EMI band avoidance.
What output voltage options are available for the LMR43610RS3QRPERQ1?
The LMR43610RS3QRPERQ1 is configured with a fixed 3.3V output voltage. The VOUT/FB pin is internally connected to the 3.3V reference, eliminating the need for external feedback resistors. This simplifies layout and improves accuracy, with ±0.9% regulation over temperature and line - ideal for powering MCUs, sensors, and communication interfaces requiring stable 3.3V rails.
Is the LMR43610RS3QRPERQ1 qualified for automotive use?
Yes, the LMR43610RS3QRPERQ1 is AEC-Q100 Grade 1 qualified (–40°C to +125°C ambient), supports 42V load dump and 3V cold-crank conditions, and includes functional safety documentation for ISO 26262 development. It is manufactured in TI's automotive-grade process and tested to stringent reliability standards - making it suitable for safety-critical ADAS, infotainment, and body electronics applications.
LMR43610RS3QRPERQ1 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:
- 1A
- 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)
LMR43610RS3QRPERQ1 FAQ
1.How can I place an order for LMR43610RS3QRPERQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR43610RS3QRPERQ1 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 LMR43610RS3QRPERQ1 reliable?
The price and inventory of LMR43610RS3QRPERQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR43610RS3QRPERQ1 is usually 5 days.
3.What payment methods are accepted for LMR43610RS3QRPERQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR43610RS3QRPERQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR43610RS3QRPERQ1?
LMR43610RS3QRPERQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR43610RS3QRPERQ1 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 LMR43610RS3QRPERQ1?
For technical support, including LMR43610RS3QRPERQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR43610RS3QRPERQ1 requirements.
6.How does Aetrix verify that LMR43610RS3QRPERQ1 is sourced from the original manufacturer or authorized distributors?
All LMR43610RS3QRPERQ1 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 LMR43610RS3QRPERQ1 meets industry standards.
7.What is the process for return or replacement of LMR43610RS3QRPERQ1?
All LMR43610RS3QRPERQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMR43610RS3QRPERQ1, 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 LMR43610RS3QRPERQ1 part is unused and in its original packaging.
Return procedure for LMR43610RS3QRPERQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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