Automotive 3.5-V to 36-V, 1-A synchronous 2.1-MHz step-down converter

The LM53600-Q1 and LM53601-Q1

synchronous buck regulator devices are optimized for automotive applications,

providing an output voltage of 5 V, 3.3 V, or an adjustable output. Load current up

to 650 mA is supported by the LM53600-Q1, while the LM53601-Q1 supports up to 1000

mA. Advanced high-speed circuitry allows the LM53600-Q1 and LM53601-Q1 devices to

regulate from an input of 18 V to an output of 3.3 V at a fixed frequency of 2.1

MHz. Innovative architecture allows the device to regulate a 3.3-V output from an

input voltage of only 3.8 V. The input voltage range up to 36 V, with transient

tolerance of up to 42 V, eases input surge protection design. An open drain reset

output, with filtering and delayed release, provides a true indication of system

status. This feature negates the requirement for an additional supervisory

component, saving cost and board space. Seamless transitions between PWM and PFM

modes, along with a quiescent current of only 23 µA, ensures high efficiency and

superior transient response at all loads. Few external components are needed

allowing the generation of compact PCB layout. While the LM53600-Q1 and LM53601-Q1

devices are Q1 rated, electrical characteristics are ensured across a junction

temperature range of –40°C up to 150°C.