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Texas Instruments LMR43610MSC3RPERQ1
- Part No.:
- LMR43610MSC3RPERQ1
- Manufacturer:
- Texas Instruments
- Package:
- 9-PowerVFQFN
- Datasheet:
-
LMR43610MSC3RPERQ1.pdf
- Description:
- IC REG BUCK ADJ/3.3V 1A 9VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,012
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Product details
Overview
LMR43610MSC3RPERQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous buck converter delivering 1A output current, 3.3V fixed output, 2.2MHz fixed switching frequency, and 1.2µA non-switching quiescent current at 13.5VIN. It operates across 3.0V–36V input range, supports 42V load dump, and targets always-on power rails in radar ECUs and infotainment head units.
For engineers reviewing the LMR43610MSC3RPERQ1 datasheet, LMR43610MSC3RPERQ1 pinout, LMR43610MSC3RPERQ1 application, or LMR43610MSC3RPERQ1 equivalent, key selection criteria include ultra-low IQ at 150°C junction, spread-spectrum EMI reduction meeting CISPR25 Class 5, MODE/SYNC pin configurability for FPWM/auto mode, thermal shutdown at 168°C, and 2mm × 2mm HotRod™ QFN package with wettable flanks.
Technical Context
The LMR43610MSC3RPERQ1 uses peak current mode control with internal compensation to minimize external components and output capacitance. Its dual random spread spectrum dithering and optimized HotRod™ pinout suppress peak EMI emissions without requiring common-mode chokes or shielding.
It implements auto mode with frequency foldback below 1mA load, enabling 1.5µA unloaded input current at 13.5VIN, while supporting FPWM mode via MODE/SYNC pin for constant-frequency operation under light loads. The device integrates high-side (132mΩ typ.) and low-side (75mΩ typ.) MOSFETs, precision enable threshold (1.23V), and PGOOD with 2.5ms activation delay.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 1A continuous DC - supports body electronics and lighting loads without derating up to 150°C TJ |
| Input Voltage Range | 3.0V to 36V - withstands 42V automotive load dump transients and 3V cold-crank conditions |
| Quiescent Current | 1.2µA at 13.5VIN, 3.3VOUT - enables >10-year battery life in always-on vehicle modules |
| Switching Frequency | Fixed 2.2MHz - avoids AM band interference and allows use of compact 1µH inductors |
| Output Voltage | 3.3V fixed ±1% - eliminates external feedback resistors and reduces BOM count |
| Package | 2mm × 2mm VQFN-HR (RPE) with wettable flanks - enables automated optical inspection and robust solder joints |
| EMI Performance | CISPR25 Class 5 compliant with spread spectrum - removes need for input EMI filters in most automotive layouts |
| Junction Temperature | –40°C to +150°C - qualified per AEC-Q100 Grade 1 for under-hood and dashboard applications |
Pinout & Package
LMR43610MSC3RPERQ1 uses a 9-pin 2mm × 2mm VQFN-HR (RPE) package with wettable flanks and corner anchor pads for enhanced solder joint reliability. Thermal resistance RθJA is 84.4°C/W on standard PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - MODE/SYNC | Mode selection & clock sync input | Configures FPWM/auto mode or synchronizes to external clock; must not be floated |
| 2 - PGOOD | Open-drain power-good flag | Signals regulation status with 2.5ms activation delay and 2.4% hysteresis; pulls low during fault or shutdown |
| 3 - EN/UVLO | Enable and undervoltage lockout input | Starts regulation at 1.23V rising threshold; shuts down at 0.88V falling threshold with 0.35V hysteresis |
| 4 - VIN | Main input supply | Accepts 3.0–36V; handles 42V transients; requires local ceramic bypass capacitor |
| 5 - SW | Switch node | Connects to power inductor; carries high di/dt; requires short, low-inductance trace routing |
| 6 - BOOT | Bootstrap supply for high-side driver | Requires 100nF ceramic capacitor between BOOT and SW for gate drive integrity |
| 7 - VCC | Internal LDO output | Supplies internal circuitry; decoupled with 1µF capacitor to GND; not for external loading |
| 8 - VOUT/FB | Output voltage sense / feedback | Direct connection to 3.3V output node; no external divider needed for fixed-output configuration |
| 9 - GND | Power ground | Primary return path; must connect to CIN with wide, low-impedance copper pour |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ | 1.2µA non-switching current at 13.5VIN enables multi-year battery standby in telematics modules |
| Integrated Spread Spectrum | Dual random dithering reduces peak EMI by >10dB, eliminating need for common-mode chokes in CISPR25 Class 5 designs |
| MODE/SYNC Pin Flexibility | Selects FPWM (constant frequency), auto (PFM foldback), or SYNC (external clock lock) - simplifies system-level timing coordination |
| Thermal Robustness | 150°C max junction temperature and 168°C thermal shutdown ensure reliable operation in engine bay and head unit environments |
| Automotive Qualification | AEC-Q100 Grade 1 (–40°C to +125°C ambient) and functional safety documentation support ASIL-B system integration |
| Miniaturized Power Stage | 2mm × 2mm HotRod™ package with internal MOSFETs achieves full 1A capability in <10mm² board area |
Applications
| Radar ECU Power Supply | Infotainment Head Unit Core Rail |
|---|---|
|
Use Scenario: Powers 77GHz radar transceiver ASICs requiring stable 3.3V at sub-100mA idle and up to 1A burst currents during chirp transmission. IC Role / Device Role / Timing Role: Primary step-down regulator supplying clean, low-noise 3.3V rail; MODE/SYNC pin synchronized to system clock to avoid beat frequencies. Use Value: Spread spectrum and 2.2MHz fixed FSW suppress conducted/radiated emissions near RF front-end, eliminating post-layout EMI filter redesign. |
Use Scenario: Delivers always-on 3.3V supply to MCU, CAN transceiver, and audio codec in automotive head units with <2µA sleep current. IC Role / Device Role / Timing Role: Always-on buck converter operating in auto mode; transitions seamlessly between PFM (ultra-low IQ) and FPWM (low-noise regulation) based on load demand. Use Value: 1.5µA shutdown current extends vehicle battery life during extended parking; wettable flanks enable AOI verification in high-reliability SMT lines. |
| eCall Module Backup Power | Body Control Module Sensor Interface |
|
Use Scenario: Provides regulated 3.3V to GNSS receiver and cellular modem in eCall systems, surviving 3V cold-crank and 42V load dump events. IC Role / Device Role / Timing Role: Input-tolerant buck converter with integrated UVLO and overvoltage protection; PGOOD signals system controller when rail is stable. Use Value: 42V absolute max VIN rating and robust thermal shutdown prevent field failures during battery jump-starts or alternator transients. |
Use Scenario: Supplies 3.3V to LIN transceivers, door lock actuators, and ambient light sensors in BCMs where space and thermal margin are constrained. IC Role / Device Role / Timing Role: Compact, thermally efficient DC/DC stage replacing discrete solutions; internal compensation reduces design cycle time. Use Value: 2mm × 2mm footprint saves >60% board area vs. legacy 3mm × 3mm buck converters; RDS(ON) values minimize self-heating at 1A continuous load. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar automotive buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR43610RS3QRPERQ1 | Adjustable switching frequency (200kHz–2.2MHz) via RT resistor; no spread spectrum | Suitable for noise-sensitive applications requiring precise frequency placement outside sensitive bands | Select when EMI filtering must target narrowband peaks rather than broadband suppression |
| LMR36503-Q1 | 65V input rating, 300mA output, same 2mm × 2mm HotRod™ footprint and pinout | Targeted at lower-power always-on sensors and microcontrollers, not 1A loads | Choose for scalability across voltage rails where footprint compatibility simplifies layout reuse |
Compared with LMR43610MSC3RPERQ1, LMR43610RS3QRPERQ1 trades fixed 2.2MHz + spread spectrum for frequency adjustability and lacks EMI dithering, while LMR36503-Q1 offers higher input voltage tolerance but only 300mA output - neither is pin-compatible, and both require layout revision for replacement.
Availability
LMR43610MSC3RPERQ1 is available at Aetrix Electronics and suitable for advanced driver assistance systems (radar ECU), infotainment and cluster (head unit, eCall), and body electronics and lighting requiring stable component supply across automotive production lifecycles.
Supply support for LMR43610MSC3RPERQ1 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-compliant design.
The LMR436x0-Q1 product line delivers ultra-miniature, low-IQ buck converters optimized for AEC-Q100 Grade 1 automotive applications including ADAS, infotainment, and body electronics where space, thermal performance, and EMI compliance are critical.
FAQ
What is the maximum input voltage transient the LMR43610MSC3RPERQ1 can survive?
The LMR43610MSC3RPERQ1 supports 42V transients on the VIN pin for durations under 100ns, as specified in its Absolute Maximum Ratings table. This capability enables reliable operation during automotive load dump events without external TVS clamping in many implementations. The device maintains regulation down to 3.0V input, covering cold-crank conditions. LMR43610MSC3RPERQ1 incorporates internal overvoltage protection and thermal shutdown to prevent damage during sustained overvoltage.
How does the MODE/SYNC pin configure FPWM versus auto mode on the LMR43610MSC3RPERQ1?
On the LMR43610MSC3RPERQ1, the MODE/SYNC pin selects operating mode via voltage thresholds: applying >1.6V sets FPWM mode (constant 2.2MHz frequency, diode emulation disabled); applying <1.0V selects auto mode (frequency foldback below 1mA, diode emulation enabled). The pin must not be left floating and requires a pull-up or pull-down resistor. LMR43610MSC3RPERQ1 does not support external clock synchronization in this variant since it is a MODE/SYNC-fixed 2.2MHz part, not an RT-adjustable version.
What is the typical efficiency of the LMR43610MSC3RPERQ1 at 1mA load and 12V input?
At 1mA load and 12V input, the LMR43610MSC3RPERQ1 achieves greater than 85% efficiency in auto mode, as stated in its official features list. This high light-load efficiency results from frequency foldback and diode emulation, which reduce switching losses. Measured data shows non-switching IQ of 1.2µA at 13.5VIN, contributing directly to this efficiency. LMR43610MSC3RPERQ1 maintains this performance across its –40°C to +150°C junction temperature range.
Does the LMR43610MSC3RPERQ1 require external compensation components?
No, the LMR43610MSC3RPERQ1 uses internal compensation optimized for minimal output capacitance and stable operation with standard ceramic output capacitors. This eliminates external compensation networks, reducing BOM count and layout complexity. The device is designed for direct use with 10µF–22µF X7R/X5R ceramic output capacitors. LMR43610MSC3RPERQ1's internal loop compensation ensures stability across all operating conditions without user adjustment.
What package type and dimensions does the LMR43610MSC3RPERQ1 use?
The LMR43610MSC3RPERQ1 uses a 9-pin VQFN-HR (RPE) package measuring 2mm × 2mm with wettable flanks and corner anchor pads. This HotRod™ package eliminates bond wires to reduce parasitic inductance and improve thermal performance. The nominal footprint is 4mm², and the package supports automated optical inspection due to exposed copper on all four sides. LMR43610MSC3RPERQ1's RθJA is 84.4°C/W on standard PCBs, enabling high-power density designs.
LMR43610MSC3RPERQ1 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:
- 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)
LMR43610MSC3RPERQ1 FAQ
1.How can I place an order for LMR43610MSC3RPERQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR43610MSC3RPERQ1 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 LMR43610MSC3RPERQ1 reliable?
The price and inventory of LMR43610MSC3RPERQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR43610MSC3RPERQ1 is usually 5 days.
3.What payment methods are accepted for LMR43610MSC3RPERQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR43610MSC3RPERQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR43610MSC3RPERQ1?
LMR43610MSC3RPERQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR43610MSC3RPERQ1 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 LMR43610MSC3RPERQ1?
For technical support, including LMR43610MSC3RPERQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR43610MSC3RPERQ1 requirements.
6.How does Aetrix verify that LMR43610MSC3RPERQ1 is sourced from the original manufacturer or authorized distributors?
All LMR43610MSC3RPERQ1 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 LMR43610MSC3RPERQ1 meets industry standards.
7.What is the process for return or replacement of LMR43610MSC3RPERQ1?
All LMR43610MSC3RPERQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMR43610MSC3RPERQ1, 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 LMR43610MSC3RPERQ1 part is unused and in its original packaging.
Return procedure for LMR43610MSC3RPERQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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