AN723 Datasheet, PDF (1/8 Pages) Vishay Siliconix – Design A High Performance Buck or Boost Converter With Si9165

AN723
Vishay Siliconix
AN723
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.
FaxBack 408-970-5600, request 70823
www.siliconix.com
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