SLVA341A Datasheet, PDF (1/9 Pages) Texas Instruments – High-Efficiency Power Solution Using DC/DC Converter With DVFS

Application Report
SLVA341A – June 2009 – Revised May 2010
High-Efficiency Power Solution Using DC/DC Converter
With DVFS
Andy Dykstra................................................................................. 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 5 V, and uses a high-efficiency DC/DC Converters with integrated FETs and
DVFS 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 note 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 PMP4979 Reference Design Schematic................................................................................. 4
2 Optional Circuit for DVDD_A, DVDD_B, and DVDD_C................................................................ 5
3 Sequencing in Start-Up Waveform ....................................................................................... 7
4 Efficiency vs Output Current .............................................................................................. 7
5 Efficiency vs Output Current .............................................................................................. 7
6 Efficiency vs Output Current............................................................................................... 7
SLVA341A – June 2009 – Revised May 2010
High-Efficiency Power Solution Using DC/DC Converter With DVFS
1
Copyright © 2009–2010, Texas Instruments Incorporated