NRF52811-QCAA-R datasheet(48/444 Pages) NORDIC

48 / 444 page

Power and clock management

5.2.1.10 WDT active

Symbol

Description

Min.

Typ.

Max.

Units

IWDT,STARTED

WDT started

1.3

µA

5.3 POWER — Power supply

This device has the following power supply features:

• On-chip LDO and DC/DC regulators

• Global System ON/OFF modes with individual RAM section power control

• Analog or digital pin wakeup from System OFF

• Supervisor HW to manage power on reset, brownout, and power fail

• Auto-controlled refresh modes for LDO and DC/DC regulators to maximize efficiency

• Automatic switching between LDO and DC/DC regulator based on load to maximize efficiency

Note: Two additional external passive components are required to use the DC/DC regulator.

5.3.1 Regulators

The following internal power regulator alternatives are supported:

• Internal LDO regulator

• Internal DC/DC regulator

The LDO is the default regulator.

The DC/DC regulator can be used as an alternative to the LDO regulator and is enabled through the

DCDCEN on page 59 register. Using the DC/DC regulator will reduce current consumption compared to

when using the LDO regulator, but the DC/DC regulator requires an external LC filter to be connected, as

shown in DC/DC regulator setup on page 49.

POWER

REG

LDO

DCDCEN

VDD

DCC

GND

DEC4

1.3V System power

Supply

DC/DC

Figure 13: LDO regulator setup

4454_140 v1.0

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