ISL6244CR Intersil, ISL6244CR Datasheet - Page 9

• Manufacturer Part Number: ISL6244CR
• Description: IC CTRLR PWM 2-4-PHASE 32-QFN
• Manufacturer: Intersil

Specifications of ISL6244CR

• Pwm Type: Voltage/Current Mode
• Number Of Outputs: 4
• Frequency - Max: 4MHz
• Duty Cycle: 75%
• Voltage - Supply: 4.75 V ~ 5.25 V
• Buck: Yes
• Boost: No
• Flyback: No
• Inverting: No
• Doubler: No
• Divider: No
• Cuk: No
• Isolated: No
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 32-VQFN Exposed Pad, 32-HVQFN, 32-SQFN, 32-DHVQFN
• Frequency-max: 4MHz
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Theory of Operation
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-
COMP
VDIFF
RGND
VSEN
IOUT
VID4
VID3
VID2
VID1
VID0
OFS
FB
AVERAGE
DYNAMIC
100µA
diff
9
DAC
VID
x 0.2
e/a
2.2V
PGOOD
UV
OV
+
-
85µA
FIGURE 12. BLOCK DIAGRAM
1/N
OC
SOFT START
ISL6244
+
+
POR
AND
VCC
GND
+
+
-
+
+
6V
+
+
effective and thermally viable have forced a change to the
cost-saving approach of multi-phase. The ISL6244 controller
helps reduce the complexity of implementation by integrating
vital functions and requiring minimal output components.
The block diagram in Figure 12 provides a top level view of
multi-phase power conversion using the ISL6244 controller.
-
+
EN
+
1.23V
-
+
+
OSCILLATOR
SAWTOOTH
-
AND
N PHASES
FS
I1
I2
I3
I4
CURRENT
DETECT
SENSE
PHASE
&
VFF
PWM1
ISEN1
ISEN2
ISEN3
ISEN4
PWM2
PWM3
PWM4
December 28, 2004
FN9106.3