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ISL6559EVAL2: Voltage Regulator Down Solution
for AMD Hammer Family Processors
Application Note
August 2004
AN1137
Author: Ross O. Staffhorst
Introduction
The AMD Hammer family microprocessors feature higher
clock speeds and greater device density than previous
product families. The power management solution for this
next generation family of microprocessors must contend with
lower core voltages, tighter transient specifications, and
higher peak current demands. Responding to the changing
power management needs of its customers, Intersil
introduces the ISL6559 controller to power the AMD
Hammer family of microprocessors.
Intersil ISL6559 and HIP6601B
The ISL6559EVAL2 is a versatile voltage regulator-down
(VRD) design. The evaluation board comes configured for
The Intersil multi-phase family driver portfolio continues to
expand with new selections to better fit our customer ’s
needs. Refer to our website for updated information:
http://www.intersil.com/power/
ISL6559 VRD Reference Design
The evaluation kit consists of the ISL6559EVAL2 board,
associated data sheets on the ISL6559 controller and
HIP6601B driver, as well as this application note. The
evaluation board provides convenient test points, two types
of power supply connectors, and an on-board transient load
generator to facilitate the evaluation process. The board is
configured for down conversion from 12V to the DAC setting.
TABLE 1. 3-PHASE VRD DESIGN PARAMETERS
3-phase buck operation, designed to meet AMD Hammer
Family Desktop Processor specifications. The board layout
supports removal of the third phase to support evaluation at
lower current specifications. The ISL6559 controller features
are specifically designed to compliment and support the
Hammer Family processors. Interfaced with HIP6601B
drivers, the chipset forms a highly integrated solution for
AMD Hammer processor applications.
PARAMETER
Static Regulation
Transient Regulation
Continuous Load Current
Load Current Step
Load Current Transient
MAX
1.350V
1.350V
52A
21A
30A/ μ s
MIN
1.250V
1.250V
19A
The ISL6559 regulates output voltage and balances load
currents for two to four synchronous buck converter
channels. The controller features a 5-bit DAC, which
provides a digital interface for accurate step down
conversion over the entire Hammer Family range of 1.550V
to 0.800V. New multi-phase family features include
differential remote output voltage sensing, to improve
regulation tolerance; pin-adjustable reference offset, for
ease of implementation; VID-on-the-Fly, to respond to DAC
changes during operation; and optional load line regulation.
For a more detailed description of the ISL6559 functionality,
refer to the data sheet [1].
The HIP6601B driver is chosen to drive two N-Channel
power MOSFETs in a synchronous-rectified buck converter
channel. Each channel has a single logic input that controls
the upper and lower MOSFETs. Dead time is optimized on
both switching edges to provide shoot-thru protection.
Internal bootstrap circuitry only requires an external
capacitor and provides better enhancement of the upper
MOSFET. For a more detailed description of the HIP6601B,
refer to the data sheet [2]. In applications where space is a
premium, the HIP6602B driver is recommended. The
HIP6602B drives two converter channels and requires less
implementation area. For more information refer to the
HIP6602B data sheet [3].
The evaluation board meets the output voltage and current
specifications, shown in Table 1, with the VID DIP switch
(SW3) set to 01010 (1.300V). Two jumpers near the
controller are preset and should be checked before powering
up the board. The JP1 jumper should be in the +12V position
(center and right leg with the ATX connector to your right),
and JP2 should be in the ON position (left and center legs).
Additional information on the function of these jumpers is
given in the following section.
The printed circuit board is implemented in 4-layer, 2-ounce
copper. Layout plots and part lists, for this design, are
provided at the end of the application note.
Quick Start Evaluation
Circuit Setup
The ISL6559EVAL2 board will arrive with the VID DIP switch
(SW3) set to 01010 (1.300V). If another output voltage level
is desired, refer to the ISL6559 data sheet for the complete
DAC table and change the VID switches accordingly. Note:
changing the SW3 VID states will change the dynamics of
the load generator.
JP1 selects the VCC voltage to the ISL6559 controller. This
jumper is preset to +12V to create a 12V only converter
solution, as presented. Move the JP1 jumper to the right
most pins to select operation directly from +5V. JP2 sets the
1
1-888-INTERSIL or 321-724-7143
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Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2004. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
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ISL6560C WAF 制造商:Intersil Corporation 功能描述:
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