WM8350 Datasheet, PDF (142/340 Pages) Wolfson Microelectronics plc – Wolfson AudioPlus™ Stereo CODEC with Power Management

WM8350
Production Data
14.8 DC-DC CONVERTER OPERATION
14.8.1 OVERVIEW
The WM8350 provides six DC-DC switching converters. Four of these are Buck (Step-down)
converters and two are Boost (Step-up) converters. The principal characteristics and typical usage
for each DC-DC converter are shown below.
Typical Application
Converter Type
Input Voltage Range
DC-DC 1 / 6
Other system
components
Step-down
DC-DC 2 / 5
Constant-current
LED drivers or I/O
supply
Step-up,
using external
NFET
2.7V to 5.5V
DC-DC 3 / 4
Digital supply for
WM8350 and
other components
Step-down
Output Voltage Range
0.85V to 3.4V
5V to 20V
0.85V to 3.4V
Load Current Rating
Switching Frequency
Up to 1A
(may be limited
by application)
2.0MHz
170mA @ 5V
40mA @ 20V
1.0MHz
Up to 500mA
(may be limited by
application)
2.0MHz
Table 90 DC-DC Converter Characteristics
w
PD, February 2011, Rev 4.4
142