Part # Application Notes Access Control Data Storage Devices Imaging datasheet

Part Manufacturer: ST Microelectronics

ST Microelectronics

Part Description: ST1S12 small synchronous buck converter


Part Details:

AN2728 Application note ST1S12 small synchronous buck converter Introduction The ST1S12 family of synchronous step-down DC-DC converters optimized for powering low-voltage digital cores in HDD applications is generally used to replace the high-current linear solution when the 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 (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. 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 device is thermal protected and current limited to prevent damages due to accidental short-circuit. This family of products is available in the TSOT23-5L package. Figure 1. ST1S12 - simplified schematic VIN UVLO + I_SEN - Rsense VSUM Comp VRST MOSFET VDRV_P Driver CONTROL LOGIC VSET OSC SW VC + DMD DMD - gm + - SHUT DOWN VDRV_N Driver SOFT START REF1 FB/V EN Gnd O April 2008 Rev 1 1/20 www.st.com 20 Contents AN2728 Contents 1 ST1S12 description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 1.1 Enable function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 1.2


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