wm8351 Wolfson Microelectronics plc, wm8351 Datasheet - Page 139

• Manufacturer Part Number: wm8351
• Description: Wolfson Audioplus? Stereo Codec With Power Management
• Manufacturer: Wolfson Microelectronics plc

Production Data
14.8 DC-DC CONVERTER OPERATION
w
14.8.1
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.
Table 89 DC-DC Converter Characteristics
Typical Application
Converter Type
Input Voltage Range
Output Voltage Range
Load Current Rating
Switching Frequency
OVERVIEW
0.85V to 3.4V
Other system
(may be limited
by application)
components
Step-down
2.048MHz
Up to 1A
DC-DC 1
Constant-current LED
using external NFET
drivers or I/O supply
170mA @ 5V
40mA @ 20V
2.7V to 5.5V
1.024MHz
5V to 20V
DC-DC 2
Step-up,
WM8351 and other
Digital supply for
(may be limited by
0.85V to 3.4V
Up to 500mA
components
DC-DC 3 / 4
Step-down
2.048MHz
PD, June 2009, Rev 4.1
application)
WM8351
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