WM8352
Production Data
14.8 DC-DC CONVERTER OPERATION
14.8.1 OVERVIEW
The WM8352 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.
DC-DC 1 / 6
DC-DC 2 / 5
DC-DC 3 / 4
Typical Application
Converter Type
Other system
components
Constant-current
LED drivers or I/O
supply
Digital supply for
WM8352 and
other components
Step-down
Step-up,
using external
NFET
Step-down
Input Voltage Range
Output Voltage Range
Load Current Rating
2.7V to 5.5V
0.85V to 3.4V
Up to 1A
5V to 20V
0.85V to 3.4V
Up to 500mA
170mA @ 5V
40mA @ 20V
(may be limited
by application)
(may be limited by
application)
Switching Frequency
2.0MHz
1.0MHz
2.0MHz
Table 90 DC-DC Converter Characteristics
PD, February 2011, Rev 4.4
140
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
