1
TM
HIP6302EVAL1 - Multiphase Power Conversion
for AMD Athlon Processors up to 35A
Introduction
Each generation of computer microprocessor brings
performance advances in computing power. Performance
improvements are made possible by advances in fabrication
technology that enable greater device density. Newer
processors are operating at lower voltages and higher clock
speeds both of which contribute to greater demands on the
microprocessor core voltage supply in terms of higher peak
currents and higher current-slew rates.
Intersil’s family of multi-phase DC-DC converter solutions
provide the ideal solution to supply the core-voltage needs of
present and future high-performance microprocessors.
Intersil HIP6302 and HIP6601
The HIP6302 controller IC works with two HIP6601A or
HIP6603A single-channel driver ICs or a single HIP6602A
dual-channel driver IC [3] to form a highly integrated solution
for high-current, high slew-rate applications. The HIP6302
regulates output voltage, balances load currents and
provides protective functions for two synchronous-rectified
buck-converter channels.
The integrated high-bandwidth error amplifier provides
voltage regulation, while current-sense circuitry maintains
phase-current balance between the two power channels and
provides feedback for droop compensation and over-current
protection. A five-bit DAC provides a digital interface to
program the 1% accurate reference and a window
comparator toggles PGOOD if the output voltage is out of
range and acts to protect the load in case of over voltage.
For more detailed descriptions of the HIP6302 functionality,
refer to the HIP6302 Data Sheet [1].
The HIP6601A is a driver IC capable of delivering up to 2A of
gate-charging current for rapidly switching both MOSFETs in
a synchronous-rectified bridge. The HIP6601A accepts a
single logic input to control both upper and lower MOSFETs.
Adaptive shoot-through protection is provided on both
switching edges to provide optimal dead time, and bootstrap
circuitry permits greater enhancement of the upper
MOSFET. For a more detailed description of the HIP6601A,
refer to the HIP6601A Data Sheet [2].
The HIP6302EVAL1 Board and Reference
Design
With the VID jumpers set to 1.7V (00110), the evaluation
board meets the output voltage and current specifications
indicated in Table 1.
FIGURE 1. HIP6302 BLOCK DIAGRAM
-
+
UV
15
OV
LATCH
-
+
OVP
x 0.9
10
POWER-ON
RESET (POR)
PGOOD
VCC
16
SOFT START
AND FAULT
LOGIC
CLOCK AND
SAWTOOTH
GENERATOR
S
x 1.15
6
DAC
COMP
1
VID4
2
VID3
3
VID2
4
VID1
5
VID0
E/A
-
+
7
FB
CURRENT
DETECTION
∑
+
∑
-
+
-
+
PWM
-
+
PWM
THREE STATE
12
13
FS/DIS
VSEN
-
PWM1
PWM2
∑
+
14
11
ISEN1
ISEN2
GND
9
8
+
TABLE 1. HIP6302EVAL1 OUTPUT PARAMETERS
MIN
MAX
Static Regulation
1.65V
1.75V
Transient Regulation
1.60V
1.85V
Over-Voltage Protection
1.90V
2.00V
Continuous Load Current
-
35A
Over-Current Trip Level
41A
57A
Load-Current Transient
-
35A/
µ
s
FIGURE 2. HIP6601A BLOCK DIAGRAM
PVCC
7
2 BOOT
VCC
6
CONTROL
LOGIC
SHOOT
THROUGH
PROTECTION
+5V
PWM
3
10k
UGATE
PHASE
LGATE
1
8
5
4
GND
10k
Application Note
February 2002
Author: Matt Harris
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143
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Intersil (and design) is a trademark of Intersil Americas Inc.
Copyright © Intersil Americas Inc. 2002. All Rights Reserved
AN9888.1
