Synchronous buck regulator optimised for automotive applications

The Texas Instruments LM53625-Q1/LM53635-Q1 synchronous buck regulator is optimised for automotive applications, providing an output voltage of 5V, 3.3V, or an adjustable output. Advanced high-speed circuitry allows the LM53625-Q1/LM53635-Q1 to regulate from an input of 18V to an output of 3.3V at a fixed frequency of 2.1MHz. Innovative architecture allows this device to regulate a 3.3V output from an input voltage of only 3.55V. All aspects of these devices are optimised for automotive and performance-driven industrial customers. An input voltage range up to 36V, with transient tolerance up to 42V, eases input surge protection design. The automotive-qualified Hotrod QFN package with wettable flanks reduces parasitic inductance and resistance while increasing efficiency, minimising switch node ringing, and dramatically lowering electromagnetic interference (EMI). An open-drain reset output, with built-in 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 and low quiescent current (only 15µA for the 3.3V option) ensure high efficiency and superior transient responses at all loads.