WM8310GEB/V Wolfson Microelectronics, WM8310GEB/V Datasheet - Page 94

• Manufacturer Part Number: WM8310GEB/V
• Description: POWER MANAGEMENT SUBSYSTEM, 169BGA
• Manufacturer: Wolfson Microelectronics

Specifications of WM8310GEB/V

• Supply Voltage: 7V
• No. Of Step-down Dc - Dc Converters: 4
• No. Of Ldo Regulators: 11
• Digital Ic Case Style: BGA
• No. Of Pins: 169
• No. Of Regulated Outputs: 13
• Operating Temperature Range: -40°C To
• Rohs Compliant: Yes
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

WM8310
w
See Section 30.3 for details of specific recommended external components.
15.15.3 DC-DC STEP UP CONVERTER
DC-DC Converter 4 is a step-up DC-DC Converter designed to deliver high power efficiency across
full load conditions. It is designed to provide a voltage which is determined by the selected current of
either Current Sink 1 or Current Sink 2 through an external load - typically a string of LEDs.
DC-DC Converter 4 is designed with fixed frequency current mode architecture. The clock frequency
is set by an internal RC oscillator, which provides a 1MHz clock.
The typical connections to DC-DC Converter 4 are illustrated in Figure 21. The DC4_FBSRC register
field can select either ISINK1 or ISINK2 as input to the feedback circuit.
The input voltage connection, DC4VDD, is typically connected to the SYSVDD voltage node. Note
that the internal supply pins PVDD1 and PVDD2 should also be connected to SYSVDD.
Figure 21 Step-Up DC-DC Converter Connections
Note that the recommended output capacitor C
The DC4_RANGE register field must be set according to the required output voltage.
See Section 30.4 for details of specific recommended external components.
DC4_FBSRC = 0 (ISINK1)
DC4_FBSRC = 1 (ISINK2)
2.7V – 5.5V
DC4VDD
WM8310
DC-DC4
C
IN
DC4LX
DC4GND
ISINKn
DC4FB
OUT
varies according to the required output voltage.
L
C
OUT
V
O
PP, December 2009, Rev 3.0
R1
R2
Pre-Production
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