ISL6524A Datasheet, PDF (15/16 Pages) Intersil Corporation – VRM8.5 PWM and Triple Linear Power System Controller

ISL6524A DC-DC Converter Application Circuit
Figure 14 shows an application circuit of a power supply for
a microprocessor computer system. The power supply
provides the microprocessor core voltage (V_OUT1), the GTL
bus voltage (V_OUT2), the AGP bus voltage (V_OUT3), and the
memory controller hub voltage (V_OUT4) from +3.3V, +5VDC,
and +12VDC. For detailed information on the circuit,
including a Bill-of-Materials and circuit board description, see
Application Note AN9925. Also see the Intersil web site at
www.intersil.com
+5V
+12V
+3.3V
L1
1µH
+ _C1
680µF
GND
GND
GND
C2
C3
1µF
C4
1µF
1nF
FIX
2
VCC
28
R2
23
OCSET1 1.5kΩ
R3
10kΩ
Q3
HUF76107
DRIVE2
1
8
PGOOD
POWER GOOD
V_OUT2 (VTT)
+1.2V
+
C6
1000µF
VSEN2
11
FAULT/RT ₁₀
27 ^UGATE1
26
PHASE1
25 ^LGATE1
Q1
HUF76139
Q2
HUF76143
L2
1.8µH
VTT
POWER GOOD
R10
10kΩ
Q4
HUF76107
V_OUT3 (AGP)
+1.5V
+ _C17
560µF
Q5
2SD1802
V_OUT4 (MCH)
+1.8V
+ _C20
560µF
C14 ⁺
10µF
PGND
24
R7
4.99kΩ
VTTPG
9
U1
22 ^VSEN1
21 ^FB1
ISL6524A
C12
R11
3.32kΩ
VAUX
16
COMP1 ^270pF
20
C13 R13
C15 R14
22nF 33Ω
DRIVE3
18
VSEN3
19
DRIVE4
15
VSEN4
14
2.2nF 43kΩ
VID25
7
6 ^VID0
5 ^VID1
4 ^VID2
VID3
3
12 ^SS24
17
GND
13 ^SS13
C21
0.1µF
C18
0.1µF
R15
267kΩ
V_OUT1 (CORE)
(1.050V to 1.825V)
+ _C7-9
3x1000µF
C11
0.30µF
R12
12.1k
FIGURE 14.
15
FN9064.1
April 8, 2005