Description and application of ST1S03PUR chip
The ST1S03 is a step-down DC-DC converter
optimized for powering a low voltage digital core
in HDD applications and, generally, to replace the
high current linear solution when the power
dissipation may cause a high heating of the
application environment. It provides up to 1.5 A
over an input voltage range of 3 V to 16 V. A high
switching frequency (1.5 MHz) allows the use of
tiny surface-mount components: as well as the
resistor divider to set the output voltage value,
only an inductor, a Schottky diode and two
capacitors are required. Besides, a low output
ripple is guaranteed by the current mode PWM
topology and by the use of low ESR SMD ceramic
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capacitors. The device is thermal protected and
current limited to prevent damages due to an
accidental short-circuit. The ST1S03 device is
available in a DFN6D package.
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