
MAX8667/MAX8668
1.5MHz Dual Step-Down DC-DC Converters
with Dual LDOs and Individual Enables
12 ______________________________________________________________________________________
IN34
1.7V TO 5.5V
LX1
LX2
OUT1
OUT2
INPUT
2.8V TO 5.5V
OUT3
OUT4
REF
GND
IN12
300mA
300mA
EN1
EN2
EN3
EN4
OUT2
1.2A
OUT1
600mA
PGND2 PGND1
C2
10μF
C3
4.7μF
C8
4.7μF
C9
4.7μF
C1
0.01μF
L2
2.2μH
L1
2.2μH
C7
2.2μF
C6
2.2μF
MAX8667
Figure 3. MAX8667 Typical Application Circuit
IN34
LX1
LX2
FB1
FB2
INPUT
2.6V TO 5.5V
OUT3
OUT4
REF
GND
IN12
OUT3, 300mA
OUT4, 300mA
EN1
EN2
EN3
EN4
OUT2
0.6V TO 3.3V, 1.2A
OUT1
0.6V TO 3.3V, 600mA
PGND1 PGND2
C2
10μF
C8
4.7μF
C9
4.7μF
C1
0.01μF
L2
2.2μH
L1
2.2μH
C7
2.2μF
C6
2.2μF
R1
R2
*C10, R5, AND R6 ARE OPTIONAL
R6*
C4
MAX8668
R3
R4
R5*
C5
C10*
Figure 4. MAX8668 Typical Application Circuit
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