WM8310GEB/V Wolfson Microelectronics, WM8310GEB/V Datasheet - Page 68

• 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
15.5 OUTPUT VOLTAGE CONTROL
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For the standard LDOs, LDO1 - LDO6, two different Low Power modes are provided, offering limited
load current capability and reduced quiescent current. When Low Power mode is selected in the ON
or SLEEP power states, then the LDOn_LP_MODE register bits determine which Low Power mode is
selected.
Note that the operating mode and output voltage of the LDO Regulators 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.
15.5.1
The output voltage of the DC-DC Converters 1-3 in the ON power state is selected using the
DCm_ON_VSEL register fields. The output voltage of these converters in the SLEEP power state is
selected using the DCm_SLP_VSEL register fields.
DC-DC Converters 1 and 2 support two different switching frequencies, as described in Section 15.6.
Note that the supported output voltage range for these converters is restricted in the 4MHz mode; for
output voltages greater than 1.4V, the 2MHz mode must be used.
The DC-DC Converters are dynamically programmable - the output voltage may be adjusted in
software at any time. These converters are Buck (step-down) converters; their output voltage can
therefore be lower than the input voltage, but cannot be higher.
Note that the output voltage of DC-DC Converters 1 and 2 may also be controlled using the Dynamic
Voltage Scaling features described in Section 15.6. Software control (using register writes) and
hardware control (using the Hardware DVS Control inputs supported via GPIO) is supported.
Note that the output voltage 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.
When changing the output voltage of DC-DC Converters 1 and 2, the GPIO output “DC-DCm DVS
Done” can be used to confirm the DVS Control has completed; see Section 15.6 for details.
15.5.2
The output voltage of the DC-DC4 Boost Converter is set as described in Section 15.4.3. The voltage
is not commanded directly, but is regulated automatically by the WM8310 in order to support the
current that has been commanded for the selected Current Sink (ISINK).
15.5.3
The output voltage of the LDO Regulators 1-10 in the ON power state is selected using the
LDOn_ON_VSEL register fields. The output voltage of the LDO Regulators in the SLEEP power state
is selected using the LDOn_SLP_VSEL register fields.
The LDO Regulators are dynamically programmable - the output voltage may be adjusted in software
at any time.
Note that the output voltage of the LDO Regulators 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.
15.5.4
The output voltage of LDO11 can be set in two ways - it can be commanded directly, or it can be
commanded to follow the voltage selection of DC-DC Converter 1.
When LDO11_VSEL_SRC = 0, then the output voltage of LDO11 is set by LDO11_ON_VSEL (in the
ON state) or by LDO11_SLP_VSEL (in the SLEEP state) in the same way as the other LDOs.
DC-DC BUCK CONVERTERS
DC-DC BOOST CONVERTERS
LDO REGULATORS 1-10
LDO REGULATOR 11
PP, December 2009, Rev 3.0
Pre-Production
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