Data Brief
For further information contact your local STMicroelectronics sales office.
March 2008 Rev 1 1/4
4
STEVAL-ISA046V2
2 A / 3.3 V high-efficiency synchronous buck converter
evaluation board based on the ST1S09 with inhibit
Features
■ Input voltage range: 2.7 V to 5.5 V
■ Output voltage: 3.3 V
■ Max I
out
: 2 A
■ High internal switching frequency: 1.5 MHz
■ Inhibit function
■ Short-circuit protection
■ ST1S09I in the DFN6 3x3 package
Description
This evaluation board, based on the ST1S09I
family of synchronous step-down DC-DC
converters, is optimized for powering all low-
voltage 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 short-
circuit.
The ST1S09 family is available in the DFN6 3x3
package.
STEVAL-ISA046V2
www.st.com
