STMicroelectronics | STEVAL-ISA055V1

The STEVAL-ISA055V1 is a synchronous step-down DC-DC converter with enable function based on the ST1S12XX. It is 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.

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.

Features:

• Step-down current mode PWM (1.7 MHz) DCDC 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 m Ω and 400 m Ω
• Uses tiny capacitors and inductors