SLVA342A Datasheet, PDF (1/8 Pages) Texas Instruments – Simple Power Solution Using LDOs

Application Report
SLVA342A – June 2009 – Revised May 2010
Simple Power Solution Using LDOs
Ambreesh Tripathi .......................................................................... PMP - DC/DC Low-Power Converters
ABSTRACT
This reference design helps those desiring to design-in the TMS320C6742, TMS320C6746,
TMS320C6748, and OMAP-L138. This design, employing sequenced power supplies, describes a system
with an input voltage of 3.3 V, and uses LDOs for a small, simple system.
Sequenced power supply architectures are becoming commonplace in high-performance microprocessor
and digital signal processor (DSP) systems. To save power and increase processing speeds, processor
cores have smaller geometry cells and require lower supply voltages than the system bus voltages. Power
management in these systems requires special attention. This application report addresses these topics
and suggests solutions for output voltage sequencing.
Contents
1 Introduction .................................................................................................................. 2
2 Power Requirements ....................................................................................................... 2
3 Features ...................................................................................................................... 3
4 List of Material ............................................................................................................... 6
List of Figures
1 PMP4980 Reference Design Schematic................................................................................. 4
2 Optional Circuit for DVDD_A, DVDD_B, and DVDD_C................................................................ 5
3 Sequencing in Start-Up Waveform ....................................................................................... 7
List of Tables
1 Power Requirements ....................................................................................................... 2
2 PMP4980 List of Material .................................................................................................. 6
SLVA342A – June 2009 – Revised May 2010
Simple Power Solution Using LDOs
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