Application Report

SLVA371A – February 2010 – Revised April 2010

Powering Freon with TPS65070

Christian Hoefling

ABSTRACT

This documents details the design consideration of a power management unit (PMU) solution for the

OMAP-L138 (Freon) low-power applications processor with a TPS65070 five-channel power management

device.

Contents

1

OMAP-L1x8 Power and Sequencing Requirements

................................................................... 2

1.1

Power Requirements

.............................................................................................. 2

1.2

Power-Up Sequence

............................................................................................... 2

1.3

Power-Down Sequence

........................................................................................... 3

2

Sequencing with TPS65070

............................................................................................... 3

3

Detailed Power Sequence

................................................................................................. 7

4

Test Results

................................................................................................................. 7

List of Figures

1

TPS65070 Power Solution Diagram

...................................................................................... 4

2

Power-Up Sequencing Timing Diagram (1.8-V I/O)

.................................................................... 5

3

Power-Up Sequencing Timing Diagram (3.3-V I/O)

.................................................................... 6

4

Startup of DC/DC Converters and LDO2 (DCDC2 = 1.8 V)

........................................................... 7

5

Startup of LDO1 and LDO2 (DCDC2 = 1.8 V)

.......................................................................... 8

6

Startup of DC/DC Converters and LDO1 (DCDC2 = 3.3 V)

........................................................... 8

7

Startup of LDO1 and LDO2 (DCDC2 = 3.3 V)

.......................................................................... 9

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1

SLVA371A – February 2010 – Revised April 2010

Powering Freon with TPS65070

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