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September 2008 Rev 2 1/23
AN2681
Application note
ST2S06A33 / ST2S06B
synchronous dual buck converter with reset
Introduction
The ST2S06 is a dual synchronous step-down DC-DC converter optimized for powering
low-voltage digital cores in ODD applications and, generally, used to replace the high
current linear solution when the power dissipation may cause a high heating of the
application environment. It provides up to 0.5 A over an input voltage range of 2.5 V to 5.5 V.
A high switching frequency (1.5 MHz) allows the use of tiny surface-mount components. A
resistor divider to set the output voltage value, an inductor and two capacitors are required
for every channel. In addition, a low output ripple is guaranteed by the current mode PWM
topology and by the use of low ESR surface-mount ceramic capacitors.
The device is thermal protected and current limited to prevent damage due to accidental
short-circuit.
The family is available in the QFN12L (4x4 mm) package.
Figure 1. ST2S06 - simplified schematic
* Only ST2S06A/D
** Only ST2S06B
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