AN1077 Datasheet, PDF (1/16 Pages) Intersil Corporation – ISL6244EVAL1 Multi-phase Evaluation Board Setup Procedure

ISL6244EVAL1 Multi-phase Evaluation Board
®
Setup Procedure
Application Note
September 2003
AN1077
This document describes the setup procedure for the
ISL6244EVAL1 Rev B board for AMD Mobile K8 Processors.
Description
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 ISL6244 controller to power the AMD
Hammer family microprocessors.
Intersil ISL6244 and ISL6207
The ISL6244EVAL1 Rev B is a versatile voltage regulator-
down (VRD) design. The evaluation board comes configured
for 3-phase multi-phase buck operation, designed to meet
AMD Hammer Family Desktop Processor specifications. The
board layout supports removal or addition of the third and
fourth phases to support multiple applications. The ISL6244
controller features are specifically designed to compliment
and support the Hammer Family processors. Interfaced with
ISL6207 drivers, the chipset forms a highly integrated
solution for AMD Hammer processor applications.
The ISL6244 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 0.800V to 1.550V. 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 ISL6244 functionality, refer to the data sheet [1].
The ISL6207 driver is chosen to drive two N-Channel power
MOSFETs in a synchronous-rectified buck converter
channel. Each channel has a single logic input which
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
ISL6207, refer to the data sheet [1].
The Intersil multi-phase family driver portfolio continues to
expand with new selections to better fit our customer’s
needs.
1. Refer to our website for updated information, the ISL6207 data
sheet, and the ISL6244 data sheet: www.intersil.com.
Features
• Multi-Phase Power Conversion
- 2, 3 or 4 Phase Operation
• Precision r_DS(ON) Current Sharing
- Lossless
- Low Cost
• Precision CORE Voltage Regulation
- Differential Remote Output Voltage Sensing
- Programmable Reference Offset
- ± 1% System Accuracy
• Programmable Droop Voltage
• Excellent Dynamic Response
- Combined Input Voltage Feed-Forward and Pulse-by-
Pulse Average Current Mode
Ordering Information
PART NUMBER TEMP. (^oC) PACKAGE PKG. DWG. #
ISL6244CR
0 to 70 32 Ld QFN
L32.5X5
ISL6244CRZ
0 to 70 32 Lead-Free QFN L32.5X5
ISL6244HR
-10 to 100 32 Ld QFN
L32.5X5
ISL6244HRZ
-10 to 100 32 Lead-Free QFN L32.5X5
NOTE: Add “-T” suffix for 32 QFN 5x5 Tape and Reel packages.
Pinout
ISL6244CR
(32 LEAD QFN 5X5)
TOP VIEW
32 31 30 29 28 27 26 25
VID2 1
24 PWM4
VID1 2
23 ISEN4
VID0 3
22 ISEN1
NC 4
21 PWM1
OFS 5
20 PWM2
COMP 6
19 GND
FB 7
18 ISEN2
NC 8
17 ISEN3
9 10 11 12 13 14 15 16
NC = NO CONNECT
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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