Runtime Power Control For Dsps Using The Tps6200 Buck Converter

 This article describes a circuit solution for DVS based on
the TPS62000 buck converter. During the periods in which
maximum DSP performance is not required, the core sup-
ply voltage is reduced and the DSP operates at a reduced
clock rate. For the next generation of Microprocessors and
DSPs, the ability to handle this technology will become an
important feature. RPC extends battery life in handheld
applications like MP3 players, digital cameras, and PDAs.
Actual measurements using an MP3 player application
resulted in a 23% reduction of DSP core power.
 Circuit description
The TPS62000 is a member of the TPS6200X high-efficiency
synchronous buck converter family, which is specially
designed for portable applications. The TPS62000 pro-
vides a wide adjustable output voltage range, going as low
as 0.8 V. Efficiency up to 95% and output current up to
600 mA make this device ideally suited for core voltage
supply. It comes in a tiny MSOP10 package and enables a
wide input voltage range of 2 V to 5.5 V. Due to decreasing
core supply voltages in modern DSP systems, using syn-
chronous Step-down converters like TPS62000 is far more
efficient than using LDO Regulators
The TPS62000 buck converter is powered by a 3.3-V
system supply. A general-purpose I/O (GPIO) port on the
DSP selects the requested core voltage. Figure 1 illus-
trates the circuit that was used for the DVS implementa-
tion. By varying the feedback resistor network, the core
voltage CAN be adjusted to between 1.1 V and 1.5 V. A
MOSFET modifies the resistive voltage divider connected

 Replace device with TPS3705-30 TPS3705-33 TPS3705-50
TPS3707-30 TPS3707-50 or TPS62000
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Runtime power control for DSPs using the TPS62000 buck converter Circuit diagram
Runtime power control for DSPs using the
TPS62000 buck converter  Circuit diagram

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