LMR36503-Q1 Automotive Buck Converters

Texas Instruments' LMR36503-Q1 is an ultra-small 65 V, 0.3 A synchronous step-down DC/DC converter in a 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 helps the converter remain functional during a deep input voltage sag condition, making the device an excellent choice for automotive applications withstanding severe cold crank start impulses.

The PGOOD flag 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 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 be externally programmed to the desired switching frequency of operation. The features of this converter are designed to simplify implementation for a wide range of automotive end equipment.