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KT11P2JM Datasheet(PDF) 1 Page - Texas Instruments

Part No. KT11P2JM
Description  High-Integration, High-Efficiency Power Solution Using DC/DC Converters With DVFS
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Maker  TI [Texas Instruments]
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KT11P2JM Datasheet(HTML) 1 Page - Texas Instruments

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Application Report
SLVA340A – June 2009 – Revised May 2010
High-Integration, High-Efficiency Power Solution Using
DC/DC Converters With DVFS
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 5V, and uses a high-efficiency DC/DC Converter 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 small-geometry cells that 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
.................................................................................................................. 1
2
Power Requirements
....................................................................................................... 2
3
Features
...................................................................................................................... 3
4
List of Material
............................................................................................................... 5
List of Figures
1
PMP4977 Reference Design Schematic
................................................................................. 4
2
Optional circuit for DVDD_A, DVDD_B and DVDD_C
................................................................. 5
3
Shows Sequencing in Start-Up Waveform
.............................................................................. 7
4
DCDC1: Efficiency vs Output Current
.................................................................................... 7
5
DCDC2: Efficiency vs Output Current
.................................................................................... 7
6
DCDC3: Efficiency vs Output Current
.................................................................................... 7
List of Tables
1
PMP4977 List of Material
.................................................................................................. 5
1
Introduction
In dual-voltage architectures, coordinated management of power supplies is necessary to avoid potential
problems and ensure reliable performance. Power supply designers must consider the timing and voltage
differences between core and I/O voltage supplies during power-up and power-down operations.
Sequencing refers to the order, timing and differential in which the two voltage rails are powered up and
down. A system designed without proper sequencing may be at risk for two types of failures. The first of
these represents a threat to the long term reliability of the dual-voltage device, while the second is more
immediate, with the possibility of damaging interface circuits in the processor or system devices such as
memory, logic or data-converter ICs.
I
2C is a trademark of Philips Electronics N.V. Corporation.
1
SLVA340A – June 2009 – Revised May 2010
High-Integration, High-Efficiency Power Solution Using DC/DC Converters With
DVFS
Copyright © 2009–2010, Texas Instruments Incorporated


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