wm8350 Wolfson Microelectronics plc, wm8350 Datasheet - Page 144

• Manufacturer Part Number: wm8350
• Description: Wolfson Audioplus? Stereo Codec With Power Management
• Manufacturer: Wolfson Microelectronics plc

WM8350
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14.8.3
DC-DC Converters 2 and 5 are versatile step-up pulse-width-modulated (PWM) DC-DC converters
designed to deliver high power efficiency across full load conditions. The converters can also be
used as switches.
DC-DC Converters 2 and 5 are designed with a fixed frequency current mode architecture. The clock
frequency is set by the internal RC oscillator, which provides a 1.024MHz clock.
The PVDD supply pin provides the core supply for DC-DC Converter 2. The LINEDCDC supply pin
provides the core supply for DC-DC Converter 5.
The connections to DC-DC Converter 2 in Constant Voltage Mode are illustrated in Figure 70. The
equivalent circuit applies to DC-DC Converter 5 also. See Section 29.3 for details of the connections
for the Constant Current and USB operating modes of the DC-DC Step-Up Converters.
Figure 70 Step-Up DC-DC Converter Connections
The external components at the converter output are required by the DC-DC Converter integral loop
compensation circuit. Note that the recommended output capacitor Cout varies according to the
required output voltage.
See Section 29.3 for details of the recommended external components.
DC-DC STEP UP CONVERTERS
PD, June 2009, Rev 4.1
Production Data
144