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WM8351 Datasheet(PDF) 139 Page - Wolfson Microelectronics plc |
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WM8351 Datasheet(HTML) 139 Page - Wolfson Microelectronics plc |
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139 / 330 page  Production Data WM8351 w PD, April 2012, Rev 4.5 139 14.8 DC-DC CONVERTER OPERATION 14.8.1 OVERVIEW The WM8351 provides four DC-DC switching converters. Three of these are Buck (Step-down) converters and one is a Boost (Step-up) converter. The principal characteristics and typical usage for each DC-DC converter are shown below. DC-DC 1 DC-DC 2 DC-DC 3 / 4 Typical Application Other system components Constant-current LED drivers or I/O supply Digital supply for WM8351 and other components Converter Type Step-down Step-up, using external NFET Step-down Input Voltage Range 2.7V to 5.5V Output Voltage Range 0.85V to 3.4V 5V to 20V 0.85V to 3.4V Load Current Rating Up to 1A (may be limited by application) 170mA @ 5V 40mA @ 20V Up to 500mA (may be limited by application) Switching Frequency 2.0MHz 1.0MHz 2.0MHz Table 90 DC-DC Converter Characteristics |
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