ISL6563IR Intersil, ISL6563IR Datasheet - Page 17

• Manufacturer Part Number: ISL6563IR
• Description: IC CNTRLR PWM 2-PH BUCK 24-QFN
• Manufacturer: Intersil

Specifications of ISL6563IR

• Applications: Controller, Intel VRM9, VRM10, and AMD Hammer Applications
• Voltage - Input: 5 ~ 12 V
• Number Of Outputs: 1
• Voltage - Output: 0.8 ~ 1.85 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 24-VQFN Exposed Pad, 24-HVQFN, 24-SQFN, 24-DHVQFN
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

High frequency decoupling capacitors should be placed as
close to the power pins of the load, or for that reason, to any
decoupling target they are meant for, as physically possible.
Attention should be paid as not to add inductance in the
circuit board wiring that could cancel the usefulness of these
low inductance components. Consult with the manufacturer
of the load on specific decoupling requirements.
Use only specialized low-ESR capacitors intended for
switching-regulator applications for the bulk capacitors. The
bulk capacitor’s ESR determines the output ripple voltage
and the initial voltage drop following a high slew-rate
transient’s edge. In most cases, multiple capacitors of small
case size perform better than a single large case capacitor.
Bulk capacitor choices include aluminum electrolytic, OS-Con,
Tantalum and even ceramic dielectrics. An aluminum
+12V
+5V
R’
IN
R
IN
OFS
OFS
C
R
R
R
2
2
2
1
(MINIMIZE CONNECTION PATH)
DACSEL/VID12
R
LOCATE CLOSE TO IC
ISEN
(C
F1
SSEND
VRM10
C
COMP
)
ENLL
VID4
VID3
VID2
VID1
VID0
ISEN
1
OFS
FB
17
FIGURE 9. PRINTED CIRCUIT BOARD POWER PLANES AND ISLANDS
VCC
ISL6563
PVCC
(C
F2
)
PHASE1
UGATE2
PHASE2
BOOT1
UGATE1
LGATE1
BOOT2
LGATE2
PGND
GND
L
IN
ISL6563
C
C
BOOT1
BOOT2
LOCATE NEAR SWITCHING TRANSISTORS;
electrolytic capacitor’s ESR value is related to the case size
with lower ESR available in larger case sizes. However, the
equivalent series inductance (ESL) of these capacitors
increases with case size and can reduce the usefulness of the
capacitor to high slew-rate transient loading. Unfortunately,
ESL is not a specified parameter. Consult the capacitor
manufacturer and/or measure the capacitor’s impedance with
frequency to help select a suitable component.
Output Inductor Selection
One of the parameters limiting the converter’s response to a
load transient is the time required to change the inductor
current. In a multiphase converter, small inductors reduce
the response time with less impact to the total output ripple
current (as compared to single-phase converters).
(MINIMIZE CONNECTION PATH)
Q4
Q2
Q3
Q1
(C
HFIN1
(C
KEY
HFIN2
L
L
)
HEAVY TRACE ON CIRCUIT PLANE LAYER
ISLAND ON POWER PLANE LAYER
ISLAND ON CIRCUIT PLANE LAYER
VIA CONNECTION TO GROUND PLANE
OUT1
OUT2
)
C
BIN2
C
BIN1
(MINIMIZE CONNECTION PATH)
LOCATE NEAR LOAD;
C
BOUT
(C
HFOUT
June 10, 2010
)
V
FN9126.8
OUT