ST ISA045V2 User Manual
STEVAL-ISA045V2
2 A / 3.3 V high-efficiency synchronous buck converter evaluation board based on the ST1S09
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
■Short-circuit protection
■ST1S09 in the DFN6 3x3 package
Description
This evaluation board, based on the ST1S09
family of synchronous step-down DC-DC STEVAL-ISA045V2 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.
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 |
1/4 |
For further information contact your local STMicroelectronics sales office. |
www.st.com |
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Circuit schematic |
STEVAL-ISA045V2 |
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1 Circuit schematic
Figure 1. Schematic
5 VIN_A
Vin |
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VIN_SW |
L1 |
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4 |
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ST1S09 |
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R3 |
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SW 3 |
Vout |
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6 |
PG |
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GND |
VFB |
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2 |
1 |
R1 |
C1
C2
R2
GND
2/4
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