ISL6528 Datasheet, PDF (12/13 Pages) Intersil Corporation – Dual Regulator - Standard Buck PWM and Linear Power Controller

ISL6528
ISL6528 Converter Application Circuit
Figure 9 shows a typical DC-DC converter circuit for a graphics card application. Additional information on this circuit
can be obtained by referencing application note AN9982.
+3.3V
C6
330µF
C7
330µF
+5V
C5
1µF
D2
BAT54
VOUT2
(1A)
Q2
C14
1µF
R5
11.3kΩ
C12
R6
470µF ^5.36kΩ
GND
UGATE
VCC _ISL6528 ^BOOT
DRIVE2
COMP
FB2
FB
C8
1µF
C4
0.1µF
Q1
D1
L1
1.71µH
C1
150pF
R2
39.2kΩ
C2
1500pF
R1
2.32kΩ
VOUT1
(6A)
C9,C10
C11
2x470µF
1µF
Q1 FDS6690A
Fairchild
Q2 FZT649
Fairchild
L1 ETQ-P6F1R8BFA Panasonic
D1 B520C-13
Diode Inc.
R4
2.67kΩ
C1
0.018µF
R2
30.9Ω
FIGURE 9. POWER SUPPLY APPLICATION CIRCUIT FOR A GRAPHICS CONTROLLER
12
FN9038.3
December 28, 2004