STEVAL-ISA055V2 0.7 A / 3.3 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. 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.

技术特性
  • Step-down current mode PWM (1.7 MHz) DCDC converter
  • Fixed output voltage 3.3 V
  • 0.7 A output current capability
  • 3% DC output voltage tolerance
  • Synchronous rectification
  • Enable function
  • Internal soft-start
  • Typical efficiency: > 90%
  • Non switching quiescent current: max 600 μA over temperature range
  • RDS(on) typ. 250 m Ω and 400 m Ω
  • Uses tiny capacitors and inductors
功能框图
STEVAL-ISA055V2 订购信息
订购型号 产品状态 美金价格 数量 封装 包装形式 温度范围 材料声明
STEVAL-ISA055V2 NRND   1000        
DATA BRIEF
描述 版本 大小
STEVAL-ISA055V2 : DB0692: 0.7 A / 3.3 V synchronous buck converter with enable function based on the ST1S12XX 1 71KB
APPLICATION NOTES
描述 版本 大小
AN2565: PM6680A evaluation kit dual step-down controller with auxiliary voltages 2 1100KB
BILL OF MATERIALS
描述 版本 大小
Bill of materials 1.0 45KB
SCHEMATIC PACKS
描述 版本 大小
Board schematic 1.0 37KB
PCB LAYOUTS
描述 版本 大小
PCB layout 1.0 186KB