ISL6521 Datasheet, PDF (12/13 Pages) Intersil Corporation – PWM Buck DC-DC and Triple Linear Power Controller

ISL6521
ISL6521 DC-DC Converter Application Circuit
Figure 9 shows a power management application circuit for
powering an embedded processor. The circuit provides the
processor core voltage (V_CORE), the I/O voltage (V_I/O), the
clock voltage (V_CLOCK), and memory voltage (V_MEMORY)
from a single +5V supply. A component selection table
provides the recommended component values at various
load current steps.
Intersil’s portfolio of multiple output controllers continues to
expand with new selections to better fit our customer’s
needs. Refer to our website for updated information:
www.intersil.com
+5V
0.1µF C7
VCC
ISL6521
V_I/O
2.5V
Q3
+
C11
C8
10µF
R6
12.7kΩ
DRIVE2
FB2
R7
5.9kΩ
V_CLOCK
3.3V
C9
100µF
R8
18.2kΩ
C12
10µF
DRIVE3
FB3
R9
5.9kΩ
+
C1
C2
1µF
D1
MA732
BOOT
R5
OCSET
UGATE
PHASE
C3
0.47µF
Q1
L_OUT
LGATE
Q2
PGND
+
C4
C10
10µF
FB
COMP
C5
C6 R2
2.0kΩ
R1
C14 R12
V_CORE
1.5V
+5V
Q4
V_MEMORY
DRIVE4
FB4
+
+
C₁₄ ^C13
R11
R10
GND
R3
2.26kΩ
FIGURE 9. POWER SUPPLY APPLICATION CIRCUIT FOR AN EMBEDDED PROCESSOR
Component Selection Table
I_{CC_INT}
5A
10A
15A
20A
L_OUT
7.5µH
Pulse P1172.103
4.8µH
Sumida CDEP134
1.6µH
Sumida CDEP134
0.5µH
Pulse PG0006.601
Q1
IRF7910
IRF7460
IRF7821
2x
IRF7821
Q2
IRF7910
IRF7476
IRF7832
2x
IRF7832
Q3
FZT649
(1A or less)
2SD1802
(3A or less)
2SD1802
(3A or less)
2SD1802
(3A or less)
C1
1 x 1000µF
10MBZ1000M 10x12.5
2 x 1000µF
10MBZ1000M 10x12.5
2 x 1800µF
10MBZ1800M 10x20
3 x 1500µF
10MBZ1500M 10x16
C4
1 x 1200µF
6.3MBZ1200M 8x16
2 x 1800µF
6.3MBZ1800M 10x16
2 x 3300µF
6.3MBZ3300M 10x23
3 x 3300µF
6.3MBZ3300M10x23
12