The LMR36503-Q1 is the industry’s smallest 65 V, 0.3 A synchronous step-down DC/DC converter in 2-mm x 2-mm HotRod™ package. This easy-to-use converter can handle input voltage transients up to 70 V, provide excellent EMI performance and support fixed 3.3 V, 5 V and other adjustable output voltages.
The LMR36503-Q1 uses peak current mode control architecture with internal compensation and maintains stable operation with minimal output capacitance. The wide input operating range of the LMR36503-Q1 helps it remain functional during a deep input voltage sag condition, making it an excellent choice for automotive applications withstanding severe cold crank start impulses. The PGOOD flag in the LMR36503-Q1 provides precise indication of the output voltage status, eliminating the requirement for an external supervisor. A seamless transition from FPWM to PFM, with an ultra-low standby quiescent current allows the LMR36503-Q1 to support much higher system efficiency at low output loads. The MODE/SYNC pin variant helps to synchronize the LMR36503-Q1 to an external clock. With the right resistor selection, the LMR36503-Q1 RT pin variant can also be externally programmed to any desired switching frequency of operation. The rich feature set of the LMR36503-Q1 is designed to simplify implementation for a wide range of automotive end equipments.
| Top documentation | Type | Title | Format options | Date |
|---|---|---|---|---|
| * | Data sheet | LMR36503-Q1 3-V to 65-V, 0.3-A Synchronous Buck Converter Optimized for Size and Light Load Efficiency datasheet (Rev. B) | PDF | HTML | Sep 22, 2020 |
| White paper | Design Considerations for 48V Automotive Body Motor Applications | PDF | HTML | Feb 17, 2026 | |
| Selection guide | Buck Converter Quick Reference Guide (Rev. B) | Apr 8, 2021 | ||
| Functional safety information | LMR3650x-Q1 Functional Safety, FIT Rate, FMD and Pin FMA | PDF | HTML | Oct 26, 2020 | |
| Technical article | Optimizing flip-chip IC thermal performance in automotive designs | PDF | HTML | Dec 11, 2019 |
For additional terms or required resources, click any title below to view the detail page where available.
The LMR36503E-Q1 is a 65V DC/DC, 0.3A buck regulator that features synchronous rectification to achieve high conversion efficiency in a small footprint. The LMR36503E-Q1 evaluation module (EVM) operates over a wide input voltage range of 5.5V to 65V to provide a regulated 5V output up to 0.3A load (...)
The LMR36506MSCEVM evaluation module (EVM) is a fully assembled and tested circuit for evaluating the LMR36506-Q1 synchronous step-down converter. The LMR36503-Q1 can also be evaluated with LMR36506MSCEVM.
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| VQFN-HR (RPE) | 9 | Ultra Librarian |
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