ISL6532A Datasheet, PDF (16/17 Pages) Intersil Corporation – ACPI Regulator/Controller for Dual Channel DDR Memory Systems

ISL6532A
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:
P_LINEAR ≅ I_O × (V_IN - V_OUT)
(EQ. 13)
where I_O is the maximum output current and V_OUT 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.
+3.3V
PGOOD
V_DDQ
V_REF
C₂₆
0.1μF
R₂
10.0kΩ
SLP_S5
SLP_S3
V_TT
1.25V
V_DDQ
C₂₇
0.1μF
C₁₉
0.47μF
C₂₀⁺
220μF
V_DDQ
+ _C21
220μF
Q₄
V_AGP
1.5V
C₂₄
+ _C23
220μF
1μF
R₁₀ 100kΩ
C_{25 680pF}
R₈
249Ω
R₉
287Ω
5VSBY
C_17,18
1μF
VCC12
C₁₆
1μF
PGOOD
S5#
S3#
VREF_OUT
VREF_IN
NCH
OCSET
UGATE
PHASE
ISL6532A
VTT
VTT
VTTSNS
DRIVE2
LGATE
VDDQ
VDDQ
VDDQ
GNDQ
GNDQ
FB
COMP
FB2
R₁
4.99kΩ
VCC5
Q₅
C₂₂ 1000pF
R₇ 8.87kΩ
L₁
2.1μH
C_4,5 ^{+ C}1-3
1μF
2200μF
Q_1,3
L₂
2.1μH
Q_2,4
V_DDQ
2.5V 15A_MAX
+ ^C6-8
1800μF _C9-12
22μF
R₄
1.74kΩ
C₁₅
1000pF
C₁₃ R₅
56nF 22.6Ω
C₁₄
R₃
6.8nF 19.1kΩ
R₆
825Ω
FIGURE 8. DDR SDRAM AND AGP VOLTAGE REGULATOR USING THE ISL6532A
16
FN9099.5
May 5, 2008