STEVAL-ISA055V1:0.7 A / 1.2 V synchronous buck converter with enable function based on the ST1S12XX

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
Product Specifications
DescriptionVersionSize
DB0691: 0.7 A / 1.2 V synchronous buck converter with enable function based on the ST1S12XX1.272 KB
Board Manufacturing Specifications
DescriptionVersionSize
Gerber files for STEVAL-ISA055V1 board1.0185 KB
Bill of Materials
DescriptionVersionSize
BOM for STEVAL-ISA055V1 board1.044 KB
Schematic Packs
DescriptionVersionSize
Board schematics for STEVAL-ISA055V1 board1.035 KB
License Agreement
DescriptionVersionSize
Evaluation products license agreement1.0125 KB
Sample & Buy
Part NumberCore ProductUnit Price (US$) *QuantityECCN (EU)ECCN (US)Country of Origin
STEVAL-ISA055V1ST1S12GR30.631NECEAR99ITALY
Quality & Reliability
Part NumberPackageGradeRoHS Compliance GradeMaterial Declaration**
STEVAL-ISA055V1CARDIndustrialEcopack2
0.7 A / 1.2 V synchronous buck converter with enable function based on the ST1S12XX STEVAL-ISA055V1
0.7 A / 1.2 V synchronous buck converter with enable function based on the ST1S12XX STEVAL-ISA055V1
0.7 A / 1.2 V synchronous buck converter with enable function based on the ST1S12XX STEVAL-ISA055V1
0.7 A / 1.2 V synchronous buck converter with enable function based on the ST1S12XX STEVAL-ISA055V1
ST-LINK/V2 in-circuit debugger/programmer for STM8 and STM32 ST-LINK-V2