Automotive integrated-coil step-down ‘micro DC/DC’ converters

10th January 2019
Alex Lynn

It has been announced that Torex Semiconductor has launched the XDL601/XDL602 series of HiSAT-COT control and 1.5A coil-integrated step-down ‘micro DC/DC’ converters for automotive applications. The XDL601/XDL602 series consist of ultra-compact step-down DC/DC converters with integrated coils and control ICs.

Simply adding two ceramic capacitors to their external components can make it possible to create a power supply circuit with a maximum of 1.5A, and a 50% or greater reduction in space compared to structures using stand-alone DC/DC converters. Since the coil is built-in, board layouts can be simplified to minimise malfunctions, noise, and other problems arising from component placement or wire routing.

The input voltage can range from 2.5 to 5.5V and the output voltage from 0.8 to 3.6V (standard voltage settings exist), with a switching frequency of 3.0MHz and a circuit system which employs synchronous rectification. The operating mode uses ‘HiSAT-COT control’ which has outstanding transient response characteristics, and allows either ‘PWM control’ or ‘PWM/PFM automatic switching control’ to be selected depending on the application. ‘PWM control’ is capable of suppressing output ripple voltage to a low level, while ‘PWM/PFM automatic switching control’ can achieve high efficiency over all load ranges from light to heavy loading.

The XDL601/XDL602 series are compliant with AEC-Q100 Grade 2, at an operating temperature range of -40 to +105°C. The package is an ultra-compact DFN3625-11A (3.6x2.5x1.6mm) which uses a wettable flank structure. Fillets are formed at the sides of the terminal, allowing automatic visual inspections of solder joints to be performed.

HiSAT-COT is a proprietary high-speed transient response technology which Torex developed and the DC / DC converters with HiSAT-COT technology are ideal for LSI's that require high precision and high stability power supply voltage.

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