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STEVAL-ISA055V2

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0.7 A / 3.3 V synchronous buck converter with enable function based on the ST1S12XX

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$51.45
Parameter NameParameter Value
Target ApplicationDC-DC Topologies
Core ProductST1S12GR
Input Voltage Min Volt2.5
Input Voltage Max Volt5.5
ECCN USEAR99
ECCN EUNEC
Packing TypeNot Applicable
RoHs compliantEcopack2
GradeIndustrial
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. 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.

Key features
  • RDS(on) typ. 250 m and 400 m
  • Non 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 3.3 V
  • Synchronous rectification
  • Typical efficiency: > 90%
  • 3% DC output voltage tolerance
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