STMICROELECTRONICS STEVAL

STEVAL-ISA046V2
2 A / 3.3 V high-efficiency synchronous buck converter
evaluation board based on the ST1S09 with inhibit
Data Brief
Features
■
Input voltage range: 2.7 V to 5.5 V
■
Output voltage: 3.3 V
■
Max Iout: 2 A
■
High internal switching frequency: 1.5 MHz
■
Inhibit function
■
Short-circuit protection
■
ST1S09I in the DFN6 3x3 package
Description
STEVAL-ISA046V2
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.
March 2008
Rev 1
For further information contact your local STMicroelectronics sales office.
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Circuit schematic
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Circuit schematic
Figure 1.
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STEVAL-ISA046V2
Schematic
STEVAL-ISA046V2
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Revision history
Revision history
Table 1.
Document revision history
Date
Revision
03-Mar-2008
1
Changes
Initial release.
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STEVAL-ISA046V2
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