LM10520 Datasheet, PDF (1/40 Pages) National Semiconductor (TI) – 20A Adaptive Voltage Scaling (AVS) Evaluation Board

LM10520
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SNVS638 – NOVEMBER 2010
LM10520 Single-Phase Buck Controller for AVS Systems
Check for Samples: LM10520
FEATURES
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•23 Typical Power Savings with AVS: 20 to 50%
• PWI 2.0 Interface
• 7-Bit AVS Control for One Output (Typical
Range of 0.6V to 1.2V)
• Precision Enable
• Integrated, Non-Overlapping NFET Drivers
• Switching Frequency Over 50 kHz to 1MHz
• Switching Frequency Synchronize Range from
250 kHz to 1MHz
• Startup into Pre-Biased Output
• Power Stage Input from 1V to 14V
• Control stage Input from 3V to 6V
• Power Good Flag and Shutdown
• Output Over-Voltage and Under-Voltage
Detection
• Low-Side Adjustable Current Sensing
• Adjustable Soft Start
• Tracking and Sequencing with Shutdown and
Soft-Start Pins
• TSSOP-28 Package
APPLICATIONS
• AVS-Enabled FPGAs
• AVS-Enabled ASICs
DESCRIPTION
The LM10520 is a single-phase Energy Management
Unit (EMU) that actively reduces system-level power
consumption by utilizing a continuous, real-time,
closed-loop Adaptive Voltage Scaling (AVS) scheme.
The AVS technology enables optimum energy
management delivery to the load in order to maximize
system-level energy savings.
The LM10520 operates cooperatively with
PowerWise™ AVS-compatible ASICs, SoCs, and
processors to optimize supply voltages adaptively
over process and temperature variations. The device
is controlled via the high-speed serial PWI 2.0 open-
standard interface. It also supports Dynamic Voltage
Scaling (DVS) using frequency-voltage pairs from
pre-characterized lookup tables.
The LM10520 features a fixed-frequency voltage-
mode PWM control architecture which is adjustable
from 50 kHz to 1MHz with one external resistor. In
addition, the LM10520 allows the switching frequency
to be synchronized to an external clock signal over
the range of 250 kHz to 1MHz. This wide range of
switching frequency gives the power supply designer
the flexibility to make better tradeoffs between
component size, cost and efficiency.
Features include the ability to startup with a pre-
biased load on the output, soft-start, input under-
voltage lockout (UVLO) and Power good (based on
both under-voltage and over-voltage detection). In
addition, the soft-start pin can be used for
implementing precise tracking, for the purpose of
sequencing with respect to an external rail.
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Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PowerWise is a trademark of Texas Instruments.
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All other trademarks are the property of their respective owners.
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PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2010, Texas Instruments Incorporated