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2 A / 3.3 V high-efficiency synchronous buck converter evaluation board based on the ST1S09I with inhibit

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Parameter NameParameter Value
Target ApplicationDC-DC Topologies
Core ProductST1S09IPUR
Input Voltage Min Volt2.7
Input Voltage Max Volt6.0
Packing TypeNot Applicable
RoHs compliantEcopack2
Package NameCARD

This evaluation board, based on the ST1S09I family of synchronous step-down DC-DC converters, is optimized for powering all lowvoltage applications and, generally, replaces high current linear solutions when power dissipation may cause high heating of the application environment. It provides up to 2 A over an input voltage range of 2.7 V to 5.5 V.

A high 1.5 MHz switching frequency allows the use of tiny surface-mount components and in addition to the resistor divider to set the output voltage value, an inductor and two capacitors are required.

The ST1S09I features an inhibit function.

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 thermally protected and current limited to prevent damage due to accidental shortcircuit.

The ST1S09 family is available in the DFN6 3x3 package.

Key features
  • ST1S09I in the DFN6 3x3 package
  • Short-circuit protection
  • Input voltage range: 2.7 V to 5.5 V
  • Max Iout: 2 A
  • Output voltage: 3.3 V
  • Inhibit function
  • High internal switching frequency: 1.5 MHz
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