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WM8351 bảng dữ liệu(PDF) 139 Page - Wolfson Microelectronics plc

tên linh kiện WM8351
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PDF  330 Pages
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nhà sản xuất  WOLFSON [Wolfson Microelectronics plc]
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WM8351 bảng dữ liệu(HTML) 139 Page - Wolfson Microelectronics plc

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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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