WM8310GEB/V Wolfson Microelectronics, WM8310GEB/V Datasheet - Page 67

• 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

Pre-Production
15.4 OPERATING MODE CONTROL
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15.4.1
The DC-DC (Buck) Converters DC-DC1, DC-DC2 and DC-DC3 can be configured to operate in four
different operating modes. The operating modes are summarised in Table 33. For more detailed
information on the DC-DC Step-Down Converter operating modes, see Section 15.15.2.
Table 33 DC-DC (Buck) Converters Operating Modes
The operating mode of the DC-DC Converters in the ON power state is selected using the
DCm_ON_MODE register fields. The operating mode of the DC-DC Converters in the SLEEP power
state is selected using the DCm_SLP_MODE register fields.
When changing the operating mode of the DC-DC Converters in preparation for an increased load, a
set-up time of 100μs should be allowed for the operating mode to be established before applying the
new load.
Note that the operating mode of the DC-DC Converters may also be controlled by the Hardware
Control inputs. The Hardware Control inputs are alternate functions supported via GPIO. See
Section 15.9 for details of Hardware Control.
15.4.2
The DC-DC4 Boost Converter is enabled by setting the DC4_ENA bit as described in Section 15.2.
Note that this Converter cannot be enabled automatically under timeslot control in the ON transition.
However, the Converter can either be disabled or unchanged in the SLEEP transition, as determined
by DC4_SLPENA.
The Boost Converter is intended to be used as a power supply for either of the Current Sinks, ISINK1
or ISINK2 (see Section 16). The Boost Converter must be configured for the applicable Current Sink
using the DC4_FBSRC bit.
When the DC-DC4 Boost Converter is enabled, its output voltage is regulated in such a way that the
selected ISINK voltage (at ISINK1 or ISINK2) is 0.5V. Output voltages of up to 30V can be generated
in order to support the current that has been selected for the ISINK. The required voltage range must
be set using the DC4_RANGE field in order to ensure stable operation.
If the Boost Converter is used to provide a supply for both ISINKs simultaneously, then the
DC4_RANGE and DC4_FBSRC bits should be set according to whichever of the ISINKs requires the
higher supply voltage.
15.4.3
The LDO Regulators LDO1 - LDO10 can be configured to operate in Normal operating mode or in
Low Power mode.
The operating mode of the LDO Regulators in the ON power state is selected using the
LDOn_ON_MODE register fields. The operating mode of the LDO Regulators in the SLEEP power
state is selected using the LDOn_SLP_MODE register fields.
Forced Continuous Conduction
Mode (FCCM)
Continuous / Discontinuous
Conduction with Pulse-Skipping
Mode (CCM/DCM with PS)
Hysteretic Mode
LDO Mode
DC-DC CONVERTER
OPERATING MODE
DC-DC BUCK CONVERTERS
DC-DC BOOST CONVERTERS
LDO REGULATORS
High performance mode for all static and transient load
conditions.
High efficiency mode for all static and transient load
conditions. Performance may be less than FCCM mode for
heavy load transients.
High efficiency mode for light static and light transient loads
only. Maximum load current is restricted; output voltage
ripple is increased.
Power saving mode for light loads only. High efficiency for
ultra light loads. Low current soft-start control.
DESCRIPTION
PP, December 2009, Rev 3.0
WM8310
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