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ISL6532ACR Datasheet(PDF) 16 Page - Intersil Corporation

Part No. ISL6532ACR
Description  ACPI Regulator/Controller for Dual Channel DDR Memory Systems
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Maker  INTERSIL [Intersil Corporation]
Homepage  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

ISL6532ACR Datasheet(HTML) 16 Page - Intersil Corporation

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16
FN9099.5
May 5, 2008
MOSFET Selection - AGP LDO
The main criteria for selection of the linear regulator pass
transistor is package selection for efficient removal of heat.
Select a package and heatsink that maintains the junction
temperature below the rating with a maximum expected
ambient temperature.
The power dissipated in the linear regulator is:
where IO is the maximum output current and VOUT is the
nominal output voltage of the linear regulator.
ISL6532A Application Circuit
Figure 8 shows an application circuit utilizing the ISL6532A.
Detailed information on the circuit, including a complete Bill-
of-Materials and circuit board description, can be found in
Application Note AN1056.
P
LINEAR
I
O
V
IN - VOUT
()
×
(EQ. 13)
FIGURE 8. DDR SDRAM AND AGP VOLTAGE REGULATOR USING THE ISL6532A
10.0k
Ω
1
μF
5VSBY
UGATE
FB
COMP
ISL6532A
C17,18
LGATE
VCC12
VTT
VTT
+
VTT
VREF_IN
VREF_OUT
VTTSNS
PGOOD
+3.3V
Q4
+
VDDQ
DRIVE2
FB2
VDDQ
Q1,3
2.5V 15AMAX
+
+
Q2,4
VCC5
NCH
OCSET
VDDQ
GNDQ
PHASE
VAGP
1.5V
VREF
VDDQ
Q5
GNDQ
VDDQ
VDDQ
SLP_S5
SLP_S3
S5#
S3#
PGOOD
C16
R2
1
μF
L1
2.1
μH
L2
2.1
μH
4.99k
Ω
R1
C19
0.47
μF
C22 1000pF
8.87k
Ω
R7
C6-8
C9-12
1800
μF
22
μF
6.8nF
C14
825
Ω
R6
C15
C13
R5
R4
R3
22.6
Ω
1.74k
Ω
19.1k
Ω
56nF
1000pF
680pF
C25
R10
100k
Ω
R9
287
Ω
R8
249
Ω
220
μF
C23
1
μF
C24
1.25V
+
VDDQ
C20
220
μF
C21
220
μF
C26
0.1
μF
C27
0.1
μF
C1-3
2200
μF
C4,5
1
μF
ISL6532A


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