The LM53603-Q1, LM53602-Q1 buck regulators are specifically designed for automotive
applications, providing an output voltage of 5 V or 3.3 V (with ADJ option) at 3 A or 2 A, from an
input voltage of up to 36 V. Advanced high-speed circuitry allows the device to regulate from an
input of up to 20 V, while providing an output of 5 V at a switching frequency of 2.1 MHz. The
innovative architecture allows the device to regulate a 3.3 V output from an input voltage of only
3.5 V. All aspects of this product are optimized for the automotive customer. An input voltage
range up to 36 V, with transient tolerance up to 42 V, eases input surge protection design. An open
drain reset output, with filtering and delay, provides a true indication of system status. This
feature negates the requirement for an additional supervisory component, saving cost and board
space. Seamless transition between PWM and PFM modes, along with a no-load operating current of
only 24 µA, ensures high efficiency and superior transient response at all loads.
