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AN723 Vishay Siliconix FaxBack 408-970-5600, request 70823 www.siliconix.com 1 Design A High Performance Buck or Boost Converter With Si9165 by Kin Shum 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. Its current capability is 600 mA with a 3.3-V or higher input voltage. High efficiency can be preserved at light load by running the converter in Pulse Skipping Modulation (PSM) mode. Key functions of the Si9165 controller are discussed in the “Description” section of the datasheet. In this application note, additional information is provided, including design guidelines for both buck and boost configurations. Some test results are also presented. Note that the tips provided apply only to designing with the Si9165 controller. Please review Siliconix application notes AN715 and AN710 for more general design guidelines. IC DESCRIPTION The Si9165 is a BiCMOS controller for dc-to-dc conversion applications. Packaged in a TSSOP-20, it contains both active components required for the converter and requires minimum external components. A functional block diagram of the IC internal structure is shown in Figure 1. FIGURE 1. AN723 |
