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Texas Instruments LMR43606MSC5RPERQ1
- Part No.:
- LMR43606MSC5RPERQ1
- Manufacturer:
- Texas Instruments
- Package:
- 9-PowerVFQFN
- Datasheet:
-
LMR43606MSC5RPERQ1.pdf
- Description:
- IC REG BUCK ADJ/1V 600MA 9VQFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LMR43606MSC5RPERQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous buck converter delivering 0.6A at 5V fixed output, operating from 3.0V–36V input with 42V load-dump tolerance, featuring <2.5µA quiescent current at 150°C TJMAX and integrated spread-spectrum EMI reduction - deployed in radar ECUs and infotainment head units.
For engineers reviewing the LMR43606MSC5RPERQ1 datasheet, LMR43606MSC5RPERQ1 pinout, LMR43606MSC5RPERQ1 application, or LMR43606MSC5RPERQ1 equivalent, key selection considerations include its 2mm × 2mm HotRod™ QFN package with wettable flanks, MODE/SYNC pin for FPWM/sync mode control, 2.2MHz fixed switching frequency, PGOOD flag with 2.5ms activation delay, and thermal shutdown at 168°C.
Technical Context
The LMR43606MSC5RPERQ1 uses peak-current-mode control with internal compensation and dual-random spread-spectrum dithering to minimize conducted and radiated emissions. Its MODE/SYNC pin supports three operational modes: Auto (PFM), FPWM, and external clock synchronization - enabling seamless light-load efficiency and deterministic noise management in multi-rail automotive systems.
It integrates high-side (132mΩ typ) and low-side (75mΩ typ) MOSFETs, features precision enable thresholds (VEN-VOUT = 1.23V), and implements frequency foldback below 200kHz during dropout to sustain regulation down to 0.2V VIN–VOUT differential at 0.6A. Thermal protection includes 168°C trip with 20°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0V–36V continuous, supports 42V transients - enables direct connection to automotive battery without pre-regulator. |
| Output Voltage | Fixed 5.00V ±0.6% (4.94–5.06V) - eliminates external feedback resistors and improves accuracy over temperature. |
| Quiescent Current | 2.0µA typical at 13.5VIN, 5VOUT, Auto mode - sustains ultra-low power in always-on vehicle modules. |
| Switching Frequency | Fixed 2.2MHz - avoids AM band interference and allows use of small 1.0µH inductors and 10µF ceramic output capacitors. |
| Junction Temperature Range | –40°C to +150°C - qualified for under-hood deployment per AEC-Q100 Grade 1. |
| EMI Reduction | Dual-random spread spectrum (±4% ΔFc) + optimized HotRod™ pinout - reduces peak emissions by >10dB without external filters. |
| Power-Good Flag | Open-drain PGOOD with 2.5ms activation delay and 40µs deglitch - replaces external reset supervisors in safety-critical domains. |
Pinout & Package
LMR43606MSC5RPERQ1 is housed in a 2mm × 2mm, 9-pin VQFN-HR (RPE) package with wettable flanks for automated optical inspection and enhanced solder joint reliability. The HotRod™ construction eliminates bond wires, reducing parasitic inductance and improving EMI performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - MODE/SYNC | Mode selection & sync input | Configures Auto/FPWM operation or locks to external clock (0.2–2.5MHz); must not be floated. |
| 2 - PGOOD | Power-good status flag | Open-drain output asserting high when VOUT is within ±4.2% regulation window; 2.5ms delay ensures stable startup. |
| 3 - EN/UVLO | Enable & undervoltage lockout | Starts regulation at 1.23V rising threshold; shuts down at 0.88V falling threshold with 0.35V hysteresis. |
| 4 - VIN | Main power input | Accepts 3.0–36V; withstands 42V transients; requires local 10µF ceramic bypass to GND. |
| 5 - SW | Switch node | Connects to power inductor; carries high di/dt; layout critical for EMI and efficiency. |
| 6 - BOOT | Bootstrap supply | Drives high-side MOSFET gate; requires 100nF ceramic capacitor between BOOT and SW. |
| 7 - VCC | Internal LDO output | 3.3V internal supply for control circuitry; decouple with 1µF ceramic to GND; not for external loads. |
| 8 - VOUT/FB | Output voltage sense / feedback | Direct connection to 5V output node; internal reference set to 5.00V - no external resistor divider needed. |
| 9 - GND | Power ground | Primary return path; must be connected to system ground with short, wide traces adjacent to CIN. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C ambient (TJ up to +150°C), meeting automotive reliability and lifetime requirements. |
| Functional Safety-Capable documentation | TI provides FIT rate data, failure mode analysis, and diagnostic coverage reports for ISO 26262 ASIL-B system integration. |
| Ultra-low IQ at high temperature | 2.0µA input current at TJ = 150°C - enables >10-year battery life in always-on telematics modules. |
| Pin-selectable FPWM mode | Eliminates light-load frequency variation via MODE/SYNC pin; maintains constant 2.2MHz for predictable EMI filtering. |
| Integrated spread spectrum | Dual-random dithering reduces peak radiated emissions by >10dB - meets CISPR 25 Class 5 without shielding or chokes. |
| Thermal shutdown with hysteresis | Trips at 168°C, recovers at 148°C - prevents latch-up during transient overload while allowing safe restart. |
Applications
| Radar ECU Power Supply | Infotainment Head Unit Core Rail |
|---|---|
Use Scenario: Powers 77GHz radar SoC requiring stable 5V at 400mA with <10mV ripple and zero audible noise during sleep mode. IC Role / Device Role / Timing Role: Primary buck regulator supplying core logic and ADC rails; operates in Auto mode during standby, switches to FPWM during active chirp bursts. Use Value: 2.2MHz fixed frequency avoids AM band interference; <2.5µA IQ extends vehicle-off battery life beyond 10 years. |
Use Scenario: Generates 5V rail for ARM-based multimedia processor and display interface in digital cockpit systems. IC Role / Device Role / Timing Role: Secondary DC/DC stage after primary 12V-to-5V conversion; synchronized via MODE/SYNC to avoid beat frequencies with USB or MIPI clocks. Use Value: Spread-spectrum + HotRod™ package achieves CISPR 25 Class 5 compliance without ferrite beads or metal shields. |
| eCall Module Always-On Backup | Body Control Module Sensor Interface |
Use Scenario: Maintains 5V supply to GNSS receiver and cellular modem during engine-off, powered by backup supercapacitor. IC Role / Device Role / Timing Role: Standby regulator with deep-sleep capability; enabled only during GPS fix acquisition or emergency transmission. Use Value: 1.5µA unloaded IQ at 13.5VIN enables >3-month supercap hold-up time; PGOOD confirms rail readiness before transmission. |
Use Scenario: Supplies 5V to LIN transceivers, door-lock actuators, and ambient light sensors across distributed body electronics nodes. IC Role / Device Role / Timing Role: Local point-of-load regulator; withstands cold-crank (3V) and load-dump (42V) events without external protection. Use Value: 42V absolute max rating and –40°C to +150°C operation ensure robustness in under-dash and trunk-mounted ECUs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar automotive buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR43606MSC3RPERQ1 | Same package and pinout; fixed 3.3V output instead of 5V; identical 2.2MHz FSW and MODE/SYNC functionality. | Used where 3.3V logic rails dominate (e.g., MCU I/O, CAN transceivers); not suitable for 5V analog front-ends or USB peripherals. | Select when system requires 3.3V output with identical thermal, EMI, and enable characteristics. |
| LMR43610MSC5RPERQ1 | Pin-compatible upgrade; delivers 1A (vs. 0.6A); same 5V fixed output, 2.2MHz FSW, and MODE/SYNC pin behavior. | Required for higher-current loads such as multi-core processors or camera ISPs; shares PCB footprint but needs larger inductor and output cap. | Choose for future-proofing or when load current exceeds 0.6A; no layout change needed beyond passive component scaling. |
Compared with LMR43606MSC5RPERQ1, the LMR43606MSC3RPERQ1 offers identical performance at 3.3V output, while the LMR43610MSC5RPERQ1 provides +67% current capacity in the same footprint - enabling scalable power design across vehicle platforms without redesigning the regulator section.
Availability
LMR43606MSC5RPERQ1 is available at Aetrix Electronics and suitable for advanced driver assistance systems (radar ECU), infotainment head units, eCall modules, and body electronics requiring stable component supply with AEC-Q100 assurance and long-term automotive lifecycle support.
Supply support for LMR43606MSC5RPERQ1 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 automotive qualification expertise and functional safety infrastructure.
The LMR43606MSC5RPERQ1 belongs to TI's LMR436xx-Q1 family of automotive buck converters, designed specifically for low-IQ, high-temperature, low-EMI point-of-load regulation in ADAS, infotainment, and body electronics.
FAQ
What is the maximum input voltage the LMR43606MSC5RPERQ1 can withstand during automotive load dump?
The LMR43606MSC5RPERQ1 supports 42V transients on the VIN pin for durations under 100ns, as specified in its Absolute Maximum Ratings. This enables direct connection to 12V automotive battery systems without external TVS clamping in most standard load-dump scenarios defined by ISO 7637-2 Pulse 5a. For longer-duration transients, external protection remains recommended.
Does the LMR43606MSC5RPERQ1 require external compensation components?
No, the LMR43606MSC5RPERQ1 features fully internal compensation optimized for stability with standard 1.0µH inductors and 10µF ceramic output capacitors. No external RC networks or type-II/type-III compensators are needed - simplifying layout and reducing BOM count while maintaining phase margin >45° across temperature and load.
How does the MODE/SYNC pin function in the LMR43606MSC5RPERQ1?
In the LMR43606MSC5RPERQ1, the MODE/SYNC pin selects between Auto (PFM), FPWM, and external clock synchronization modes. Applying >1.6V sets FPWM; <1.0V selects Auto; and a 0.2–2.5MHz square wave enables SYNC mode. The pin must never be left floating and requires a pull-down or pull-up resistor depending on default mode requirement.
What is the output voltage accuracy of the LMR43606MSC5RPERQ1 over temperature and line?
The LMR43606MSC5RPERQ1 delivers 5.00V ±0.6% (4.94–5.06V) over full input range (5.5V–36V) and temperature (–40°C to +150°C) in FPWM mode. This accuracy is achieved via laser-trimmed internal reference and feedback network - eliminating need for external calibration or trimming resistors.
Can the LMR43606MSC5RPERQ1 operate during cold-crank conditions?
Yes, the LMR43606MSC5RPERQ1 starts up and regulates down to 3.0V input, meeting automotive cold-crank requirements (ISO 16750-2). It maintains 5V output regulation with ≥95% duty cycle and supports continuous operation at 3.6V input - ensuring reliable boot of safety-critical ECUs during engine cranking.
LMR43606MSC5RPERQ1 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:
- 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)
LMR43606MSC5RPERQ1 FAQ
1.How can I place an order for LMR43606MSC5RPERQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR43606MSC5RPERQ1 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 LMR43606MSC5RPERQ1 reliable?
The price and inventory of LMR43606MSC5RPERQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR43606MSC5RPERQ1 is usually 5 days.
3.What payment methods are accepted for LMR43606MSC5RPERQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR43606MSC5RPERQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR43606MSC5RPERQ1?
LMR43606MSC5RPERQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR43606MSC5RPERQ1 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 LMR43606MSC5RPERQ1?
For technical support, including LMR43606MSC5RPERQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR43606MSC5RPERQ1 requirements.
6.How does Aetrix verify that LMR43606MSC5RPERQ1 is sourced from the original manufacturer or authorized distributors?
All LMR43606MSC5RPERQ1 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 LMR43606MSC5RPERQ1 meets industry standards.
7.What is the process for return or replacement of LMR43606MSC5RPERQ1?
All LMR43606MSC5RPERQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMR43606MSC5RPERQ1, 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 LMR43606MSC5RPERQ1 part is unused and in its original packaging.
Return procedure for LMR43606MSC5RPERQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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