ISL6532ACR Intersil, ISL6532ACR Datasheet - Page 16

• Manufacturer Part Number: ISL6532ACR
• Description: IC REG/CTRLR ACPI DUAL DDR 28QFN
• Manufacturer: Intersil

Specifications of ISL6532ACR

• Applications: Memory, DDR/DDR2 Regulator
• Current - Supply: 5.25mA
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 28-QFN
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Voltage - Supply: -

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 I
nominal output voltage of the linear regulator.
P
LINEAR
C
1μF
1.25V
V
V
24
1.5V
TT
AGP
V
O
REF
≅
is the maximum output current and V
PGOOD
I
+
V
O
220μF
DDQ
V
Q
×
DDQ
C
4
C
220μF
(
20
23
V
V
0.1μF
C
IN
+
DDQ
26
- V
+
OUT
249Ω
C
220μF
R
R
21
0.1μF
FIGURE 8. DDR SDRAM AND AGP VOLTAGE REGULATOR USING THE ISL6532A
10
8
C
10.0kΩ
)
C
27
SLP_S5
SLP_S3
R
16
25
2
0.47μF
C
680pF
100kΩ
+3.3V
19
R
287Ω
9
PGOOD
S5#
S3#
VREF_OUT
VREF_IN
VTT
VTT
VTTSNS
DRIVE2
FB2
C
1μF
OUT
17,18
is the
(EQ. 13)
5VSBY
ISL6532A
ISL6532A
VCC12
OCSET
UGATE
PHASE
LGATE
GNDQ
GNDQ
COMP
VDDQ
VDDQ
VDDQ
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.
NCH
FB
C
1μF
16
4.99kΩ
R
C
R
22
7
1
6.8nF
C
14
8.87kΩ
1000pF
1000pF
C
15
19.1kΩ
R
3
VCC5
Q
Q
Q
L
2.1μH
5
1,3
56nF
2,4
R
825Ω
C
1
6
13
1.74kΩ
2.1μH
L
R
2
4
22.6Ω
C
1μF
R
4,5
5
+
+
2200μF
2.5V 15A
C
1-3
1800μF
C
V
6-8
DDQ
May 5, 2008
FN9099.5
MAX
C
22μF
9-12