STEVAL-ISA046V2

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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
ECCN USEAR99
ECCN EUNEC
Packing TypeNot Applicable
RoHs compliantEcopack2
GradeIndustrial
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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