SAMA5D27 datasheet(28/55 Pages) MICROCHIP

28 / 55 page

Integrating a 2 MHz DC/DC converter with an LDO post regulator, the MIC2800 gives two high-efficiency outputs with

a second, 300mA LDO for maximum flexibility. The DC-to-DC converter uses small values of L and C to reduce board

space while still retaining efficiency over 90% at load currents up to 600mA.

The three outputs supply the following internal nodes:

• DCDC set @ 1.8V supplies SAMA5D27C-D1G-CU DDR2 pads and device.

• LDO1 set @ 1.25V supplies SAMA5D27C-D1G-CU Core.

• LDO2 set @ 2.5V supplies SAMA5D27C-D1G-CU VDDFUSE pad.

The MIC2800 is a μCap design, operating with very small ceramic output capacitors and inductors for stability.

It is available in fixed output voltages in the 16-pin 3mm x 3mm MLF® lead-less package. For more information, refer

to the product web page.

Figure 5-4. Power Management Unit Schematic

VDDBU

VDDIN_3V3

VDDFUSE

VDDIODDR

VDDCORE

LOWQ#

nRST

4.7uF

10uF

2.2uF

100nF

10nF

2.2uH

100nF

100K

10uF

MIC2800-G1JJYML

POR

CBIAS

LOWQ

VIN1

VIN2

LDO2

EN2

EN1

CBYP

CSET

LDO

LDO1

VDDIN_3V3

56K

100nF

5.3

System Control

The SAMA5D27 SOM1 provides global system Reset (nRST) and Shutdown (SHDN) pins to the application board.

• The nRST pin is an output pin generated by the internal Power Management Unit (MIC2800-G1JJYML) in

respect with power sequence timing. It can be forced externally in case of a system crash and must be

connected as described in the example schematic below.

• The SHDN pin is an output pin and is managed by the software application. It switches the Main 3.3V Supply

ON or OFF.

SAMA5D27 SOM1

Functional Description

Datasheet

DS60001521D-page 28

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