ST ISA049V2 User Manual
STEVAL-ISA049V2
Synchronous dual buck converter with inhibit demonstration board based on the ST2S06B
Features
■Step-down current mode PWM (1.5 MHz) DC-DC converter
■Fixed or adjustable output voltage from 0.8 V
■2% DC output voltage tolerance
■Synchronous rectification
■Inhibit function
■Internal soft start for start-up current limitation and power ON delay of 50-100 µs
■Typical efficiency: > 90%
■0.5 A output current capability
■Non-switching quiescent current: max 1 mA overtemperature range
■RDS(on) 150 mΩ (typ.)
■Uses tiny capacitors and inductors
■RoHS compliant
Description
This demonstration board is based on the ST2S06B, a dual synchronous step-down DC-DC converter optimized for powering low-voltage digital cores in ODD applications and, generally, used to replace the high current linear solution when the power dissipation may cause a high heating of the application environment.
It provides up to 0.5 A over an input voltage range of 2.5 V to 5.5 V.
A high switching frequency (1.5 MHz) allows the use of tiny surface-mount components. A resistor divider to set the output voltage value, an inductor and two capacitors are required for every channel. In addition, a low output ripple is guaranteed by the current mode PWM topology and by the use of low ESR surface-mount ceramic capacitors.
The demoboard is thermal protected and current limited to prevent damage due to accidental shortcircuit.
Data brief
STEVAL-ISA049V2
July 2009 |
Doc ID 15977 Rev 1 |
1/4 |
For further information contact your local STMicroelectronics sales office. |
www.st.com |
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Circuit schematic |
STEVAL-ISA049V2 |
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1 Circuit schematic
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2/4 |
Doc ID 15977 Rev 1 |
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