ISL6580CR Intersil, ISL6580CR Datasheet - Page 9

• Manufacturer Part Number: ISL6580CR
• Description: IC DRIVER HIGH SIDE FET 56-QFN
• Manufacturer: Intersil
• Type: High Side/Low Side Driverr

Specifications of ISL6580CR

• Input Type: Non-Inverting
• Number Of Outputs: 12
• On-state Resistance: 20 mOhm
• Current - Output / Channel: 25A
• Current - Peak Output: 35A
• Voltage - Supply: 5 V ~ 12 V
• Operating Temperature: 0°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 56-VQFN
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Multi-Phase Power Conversion
Microprocessor load current profiles have changed to the
point where the multi-phase power conversion advantage is
pronounced. The technical challenges associated with
producing a single-phase converter which is both cost-
effective and thermally viable have forced a change to the
cost-saving approach of multi-phase. The ISL6590 controller
and ISL6580 Power Stages help reduce the complexity of
implementation by integrating vital functions and requiring
minimal output components. The Typical Application
Drawing provides a top level view of multi-phase power
conversion using the ISL6590 and ISL6580. The Typical
Application Drawing and the waveforms below describe a 3
phase converter. The ISL6590 can control up to 6
interleaved phases.
Interleaving
The switching of each channel in a multi-phase converter is
timed to be symmetrically out of phase with each of the other
channels. In a 3-phase converter, each channel switches 1/3
cycle after the previous channel and 1/3 cycle before the
following channel. As a result, the three-phase converter has
a combined ripple frequency three times greater than the
ripple frequency of any one phase. In addition, the peak-to-
peak amplitude of the combined inductor currents is reduced
in proportion to the number of phases (Equations 1 and 2).
Increased ripple frequency and lower ripple amplitude mean
that the designer can use less per-channel inductance and
Electrical Specifications
ATRH (ACTIVE TRANSIENT RESPONSE HIGH)
Step
Range
Default
ATRL (ACTIVE TRANSIENT RESPONSE LOW)
Step
Range
Default
VID STEP
Step
Range
PARAMETER
ATRH Step
ATRH adjustment Range
Address Register Default
ATRL Step
ATRL adjustment Range
ATRL Default
VID Step
VID Range
9
V
T
A
DD
= 25°C Unless Otherwise Specified (Continued)
= 3.3VDC, V
CC
TEST CONDITIONS
= 12VDC, V
ISL6580
DRIVE
= 5VDC, V
lower total output capacitance for any performance
specification.
Figure 1 illustrates the multiplicative effect on output ripple
frequency. The three channel currents (IL1, IL2, and IL3),
combine to form the AC ripple current and the DC load
current. The ripple component has three times the ripple
frequency of each individual channel current. The peak-to-
peak current waveforms for each phase is about 7A, and the
dc components of the inductor currents combine to feed the
load.
FIGURE 1. PWM AND INDUCTOR-CURRENT WAVEFORMS
REF
PWM1, 5V/DIV
= 2.5V, SYSCLK = 133.33MHz, SCLK = 16.67MHz,
IL1 + IL2 + IL3, 7A/DIV
FOR 3-PHASE CONVERTER
IL1, 7A/DIV
PWM3, 5V/DIV
.8325
-233
MIN
0
1µs/DIV
IL3, 7A/DIV
PWM2, 5V/DIV
-67.5
TYP
12.5
-7.5
7.5
75
IL2, 7A/DIV
MAX
233
1.6
0
UNITS
mV
mV
mV
mV
mV
mV
mV
V