STMicroelectronics | STEVAL-ISA055V1

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. For the adjustable version, a resistor divider to set the output voltage value, an inductor, and two capacitors are required and  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.

Features:

• Step-down current mode PWM (1.7 MHz) DC-DC converter
• Fixed output voltage of 1.2 V
• 0.7 A output current capability
• 3% DC output voltage tolerance
• Synchronous rectification
• Enable function
• Internal soft-start
• Typical efficiency: > 90%
• Not switching quiescent current: max 600 µA over temperature range
• RDS(on) typ. 250 mO and 400 mO
• Uses tiny capacitors and inductors

To learn more about the ST1SX product family, Click Here