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ST STEVAL-ISA045V2 handbook

1. VIN_A VIN SW 4 ST1S09 2 R3 SW 3 DON o C Vout 6 PG GND VFB 2 i R1 o o R2 C2 gt e GND STEVAL ISA045V2 Revision history 2 Revision history Table 1 Document revision history Date Revision Changes 03 Mar 2008 1 Initial release 3 4 STEVAL ISA045V2 Please Read Carefully Information in this document is provided solely in connection with ST products STMicroelectronics NV and its subsidiaries ST reserve the right to make changes corrections modifications or improvements to this document and the products and services described herein at any time without notice All ST products are sold pursuant to ST s terms and conditions of sale Purchasers are solely responsible for the choice selection and use of the ST products and services described herein and ST assumes no liability whatsoever relating to the choice selection or use of the ST products and services described herein No license express or implied by estoppel or otherwise to any intellectual property rights is granted under this document If any part of this document refers to any third party products or services it shall not be deemed a license grant by ST for the use of such third party products or services or any intellectual property contained therein or considered as a
2. Gd STEVAL ISA045V2 2 A 3 3 V high efficiency synchronous buck converter evaluation board based on the ST1S09 Features Input voltage range 2 7 V to 5 5 V Output voltage 3 3 V Max lout 2 A High internal switching frequency 1 5 MHz Short circuit protection ST1S09 in the DENG 3x3 package Description This evaluation board based on the ST1S09 family of synchronous step down DC DC converters is optimized for powering all low voltage applications and generally replaces high current linear solutions when power dissipation may cause high heating of the application environment It provides up to 2 A over an input voltage range of 2 7 V to 5 5 V A high 1 5 MHz switching frequency allows the use of tiny surface mount components and in addition to the resistor divider to set the output voltage value an inductor and two capacitors are required 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 thermally protected and current limited to prevent damage due to accidental short circuit The ST1S09 family is available in the DFN6 3x3 package March 2008 Rev 1 Data Brief STEVAL ISA045V2 1 4 For further information contact your local STMicroelectronics sales office www st com Circuit schematic STEVAL ISA045V2 2 4 Circuit schematic Figure 1 Schematic
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ST STEVAL-ISA045V2 handbook

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