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STEVAL-ISA055V2 датащи(PDF) 1 Page - STMicroelectronics |
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STEVAL-ISA055V2 датащи(HTML) 1 Page - STMicroelectronics |
1 / 4 page Data Brief For further information contact your local STMicroelectronics sales office. September 2008 Rev 1 1/4 4 STEVAL-ISA055V2 0.7 A / 3.3 V synchronous buck converter with enable function based on the ST1S12XX Features ■ Step-down current mode PWM (1.7 MHz) DC- DC converter ■ Fixed output voltage 3.3 V ■ 0.7 A output current capability ■ 3% DC output voltage tolerance ■ Synchronous rectification ■ Enable function ■ Internal soft-start ■ Typical efficiency: > 90% ■ Non switching quiescent current: max 600 µA over temperature range ■ RDS(on) typ. 250 mΩ and 400 mΩ ■ Uses tiny capacitors and inductors Description This demonstration board is based on the ST1S12 family of synchronous step-down DC-DC converters optimized for powering low-voltage digital cores in HDD (hard disk drive) applications, and is generally used to replace high-current linear solutions when power dissipation may cause high heating of the application environment. It provides up to 0.7 A over an input voltage range of 2.5 V to 5.5 V. A high switching frequency of 1.7 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 the adjustable version, while only an inductor and 2 capacitors are needed for the 1.2 V and 1.8 V fixed version. A low output ripple is guaranteed by the current mode PWM topology and by the use of low ESR surface-mount ceramic capacitors. The ST1S12 device is thermal protected and current limited to prevent damage due to accidental short-circuit. This family of products is available in the TSOT23-5L package. STEVAL-ISA055V2 www.st.com |
Аналогичный номер детали - STEVAL-ISA055V2 |
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Аналогичное описание - STEVAL-ISA055V2 |
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