ST1S09 and ST1S30 DC/DC Power Converters

1.5 MHz Step-down DC/DC converters with synchronous rectification from STMicro

Image of STMicroelectronics' ST1S09 and ST1S30 DC/DC Power ConvertersSTMicro's ST1S09 and the ST1S30 are step-down voltage regulators optimized for powering low output applications. The ST1S09 supplies a current in excess of 2 A and the ST1S30 supplies a current in excess of 3 A. Both DC/DC converters have a high switching frequency (1.5 MHz) that allows the use of tiny surface-mount components. The input voltage range for both devices is from 2.7 V to 6 V. The devices are thermally protected and the synchronous rectifier is integrated, therefore the number of external devices is reduced to minimum: a resistor divider, an inductor and two small capacitors. The typical efficiency for both step-down voltage regulators is >90%. Two versions are available for each of the devices: power good or inhibit. Both DC/DC converters are placed in small DFN packages.

Features Applications
  • Integrated output over-voltage protection
  • Typical efficiency: >90%
  • Operating junction temperature: -30°C to 125°C (ST1S09)
  • Supply voltage range: from 2.7 V to 6 V
  • 1.5 MHz fixed frequency PWM with current control mode
  • 2% DC output voltage tolerance
  • Notebook computers
  • HDD and SSD applications
  • STB applications
  • Gateway applications
  • Printer applications
  • Low voltage POL in general

ST1S09 and ST1S30 DC-DC Power Converters

ImageManufacturer Part NumberDescriptionAvailable Quantity
ST1S30IPUR datasheet linkIC REG BUCK ADJ 3A SYNC 8DFNST1S30IPURIC REG BUCK ADJ 3A SYNC 8DFN4369 - Immediate
ST1S30IPUR product page link
ST1S09IPUR datasheet linkIC REG BUCK ADJ 2A SYNC DFN6DST1S09IPURIC REG BUCK ADJ 2A SYNC DFN6D784 - Immediate
ST1S09IPUR product page link
ST1S09PUR datasheet linkIC REG BUCK ADJ 2A SYNC DFN6ST1S09PURIC REG BUCK ADJ 2A SYNC DFN60ST1S09PUR product page link
Published: 2013-07-02