INTRODUCTION
The Si9165 is a controller IC designed for dc-to-dc conversion applications with 2.7-V to 6-V input voltage. Its high operating frequency, high efficiency, high level of integration, and low noise make Si9165 the best solution yet for cellular phone power conversion. The Si9165 can be easily configured as a synchronous buck or a boost converter with internal MOSFETs operating at switching frequencies as high as 2 MHz, which enables smaller and lighter designs.