SLVA371A Datasheet, PDF (1/10 Pages) Texas Instruments – Powering Freon with TPS65070

Application Report
SLVA371A – February 2010 – Revised April 2010
Powering Freon with TPS65070
Christian Hoefling ..................................................................................... Power Management Products
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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SLVA371A – February 2010 – Revised April 2010
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Powering Freon with TPS65070
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