WM8310GEB/V Wolfson Microelectronics, WM8310GEB/V Datasheet - Page 95

• 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
15.16 LDO REGULATOR OPERATION
Converter Type
Input Voltage Range
Output Voltage Range
Load Current Rating
Pass device impedance
@ 2.5V
Table 47 LDO Regulator Overview
w
1.5V to 5.5V
0.9V to 3.3V
15.16.1 OVERVIEW
The WM8310 provides 11 LDO Regulators. Four of these are low-noise analogue LDOs. One of the
LDO Regulators (LDO11) can be configured to be enabled even when the WM8310 is in the OFF
state. The principal characteristics of the LDO Regulators are shown below.
15.16.2 LDO REGULATORS
The LDO Regulators are configurable circuits which generate accurate, low-noise supply voltages for
various system components. The LDO Regulators are dynamically programmable and can be re-
configured at any time. Two low power modes are provided for the general purpose LDOs 1-6; a
single low power mode is provided for the analogue LDOs 7-10; this enables the overall device power
consumption to be minimised at all times.
The LDOs 1-10 can also operate as current-limited switches, with no voltage regulation; this is useful
for ‘Hot Swap’ outputs, i.e. supply rails for external devices that are plugged in when the system is
already powered up - the current-limiting function prevents the in-rush current into the external device
from disturbing other system power supplies.
The input voltage to these LDOs is provided on pin LDO1VDD through to LDO10VDD respectively.
These input voltages may be provided from the SYSVDD voltage node.
LDO11 is a configurable LDO intended for ‘always-on’ functions external to the WM8310. The
WM8310 contains a further two non-configurable LDOs which support internal functions only.
The connections to LDO Regulator 1 are illustrated in Figure 22. The equivalent circuit applies to
LDO2 through to LDO10.
The input voltage connection to LDO Regulators 1 to 10 is provided on pins LDOnVDD, where n
identifies the individual LDO Regulator; these pins are typically connected to the SYSVDD node.
Note that the internal supply pins PVDD1 and PVDD2 should also be connected to SYSVDD.
Figure 22 LDO Regulator Connections
An input and output capacitor are recommended for each LDO Regulator, as illustrated above.
See Section 30.5 for details of specific recommended external components.
Purpose
General
300mA
LDO1
Up to
1Ω
1.5V to 5.5V
0.9V to 3.3V
LDO2, 3
Purpose
General
200mA
Up to
1Ω
1.5V to 5.5V
0.9V to 3.3V
LDO4, 5, 6
Purpose
General
100mA
Up to
2Ω
2.3V to 5.5V
1.0V to 3.5V
Analogue
LDO7, 8
200mA
Up to
1Ω
Up to 150mA
2.3V to 5.5V
1.0V to 3.5V
LDO9, 10
Analogue
PP, December 2009, Rev 3.0
2Ω
0.8V to 1.55V
1.8V to 5.5V
Up to 10mA
WM8310
Purpose
General
LDO11
n/a
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