ISL8112
VIN: 4.5V to 5.5V
C8
1μF
Ω
R7
1O
C5
1μ F
C10
PVCC
VIN
VCC
LDO
LDOREF
NC
GND
C1
10 μ F
BOOT1
BOOT2
10 μ F
2.5V/5A
SI4816BDY
L2: 1.5μH
Q3a
C9
0.1μF
UG1
PH1
UG2
PH2
C4
0.22μF
Q1
IRF7821
L1: 1.5μH
1.2V/15A
C11
330μF
Ω
9mO
6.3V
R1
Ω
110kO
Q3b
VCC
LG1
VSEN1
EN1
LG2
PGND
VSEN2
Q2
IRF7832
C2
Ω
3 x 330μF
4mO
6.3V
ISL8112
OUT2REF: DYNAMIC 0 TO 2.5V
73kO
R9
Ω
225kO
R2
Ω
43kO
GND
GND=5V
FB1 tied to VCC=1.5V
FB1 tied to VCC=1.5V
R3
200k Ω
BYP
FB1
AGND
ILIM1
EN2
OUT2REF
ILIM2
VCC
VREF2
OUT2REF tied to VREF3=1.05V
OUT2REF tied to VCC=3.3V
R5
VREF1
R8
110kO
C3
VCC
GND
MODE
EN_LDO
VREF2
VREF1
OPEN
C7
0.1μF
VCC
R4
Ω
225kO
VCC
R6
Ω
225kO
VCC
NC
FS
PGOOD1
PGOOD2
PAD
FREQUENCY-DEPENDENT COMPONENTS
1.2V/2.5V SMPS
SWITCHING
FREQUENCY
L1
L2
C2
C11
FS = GND
400kHz/500kHz
1.5μH
1.5μH
3X330μF
330μF
FIGURE 19. ISL8112 TYPICAL SYSTEM REGULATOR APPLICATION CIRCUIT
15
FN6396.1
August 10, 2010
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