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0.7 A / 1.2 V synchronous buck converter with enable function based on the ST1S12XX

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Parameter NameParameter Value
Target ApplicationDC-DC Topologies
Core ProductST1S12GR
Input Voltage Min Volt2.5
Input Voltage Max Volt5.5
Packing TypeNot Applicable
RoHs compliantEcopack2
Package NameCARD

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. 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.

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