ISL6440A Datasheet, PDF (15/16 Pages) Intersil Corporation – Advanced PWM and Triple Linear Power Controller for Gateway Applications

ISL6440A
ISL6440A DC-DC Converter Application Circuit
Figure 11 shows an application circuit of a power supply for a
microprocessor computer system. The power supply provides
the microprocessor core voltage (VOUT1), the AGP bus
voltage (VOUT2), the GTL bus voltage (VOUT3), and the
memory voltage (VOUT4) from +3.3V, +5VDC, and +12VDC.
For detailed information on the circuit, including a bill of
materials and circuit board description, see Application Note
AN9836. Also see Intersil’s web page (http://www.intersil.com)
for the latest information.
+12V_IN
+5V_IN
GND
+3.3V_IN
L1
1µH
C1-6 ⁺
6 x 1000µF
C7
1µF
C8
1000pF
FAULT/RT
13
VCC
28
VAUX ¹⁶
23
OCSET
R1
1.0K
8
PGOOD
C9
1µF
POWERGOOD
V_OUT2
(3.3V_IN OR 1.5V)
DRIVE2
1
10
Q3
VSEN2
+ _{C10, 11} HUF76121D3S
2 x 1000µF
TYPEDET
SELECT ₁₁
Q4
HUF76107D3S
V_OUT3
(1.5V)
+ _{C23, 24}
2 x 1000µF
V_OUT4
(1.8V)
Q5
HUF76107D3S
+ _{C25, 26}
2 x 1000µF
DRIVE3 ₁₈
VSEN3 ₁₉
DRIVE4 ₁₅
VSEN4 ₁₄
SD ₉
FIX
2
U1
ISL6440A
17
GND
27 ^UGATE
26
PHASE
25 ^LGATE
24 ^PGND
22 ^VSEN1
21 ^FB
COMP
20
Q1, 2
2xHUF76143S3S _L2
V_OUT1
(1.3V-3.5V)
4.2µH
C12-19 ⁺
8 x 1000µF
R2
10.2K
C21
10pF
R3
1.62K
C20
0.22µF
VID0
7
6 ^VID1
5 ^VID2
4 ^VID3
3 ^VID4
12 ^SS
C22
R4
2.7nF 150K
C27
0.1µF
R5
499K
FIGURE 11. POWER SUPPLY APPLICATION CIRCUIT FOR A MICROPROCESSOR COMPUTER SYSTEM
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