Mu lt i-Ou t p u t , Lo w -No is e P o w e r-S u p p ly
Co n t ro lle rs fo r No t e b o o k Co m p u t e rs
_____________________________________________________________Ap p lic a t io n Circ u it s (c o n t in u e d )
ON/OFF
*
*
INPUT
+6V TO +24V
5V ALWAYS ON
C3
10Ω
0.1µF
22 23
5
21
4.7µF
V+ SHDN SECFB VL
4.7µF
18
16
25
27
BST5
BST3
0.1µF
Q1
DH5
DH3
Q3
0.1µF
R1
L1
0.1µF
0.1µF
2.5V OUTPUT
26
24
17
19
L2
R2
LX5
DL5
LX3
DL3
+3.3V OUTPUT
C2
Q2
*
Q4
MAX1631
MAX1634
C1
*
0–MAX1635
20
14
1N5819
1N5819
PGND
CSH5
1
2
CSH3
CSL3
13
CSL5
0Ω
OPEN
12
3
FB3
FB5
RESET OUTPUT
11
10
0Ω
OPEN
RESET
SKIP
7
TIME/ON5
RUN/ON3
GND
ON/OFF
ON/OFF
28
4
STEER
8
REF SYNC SEQ
15
9
6
1µF
R1 = R2 = 15mΩ
L1 = L2 = 6.8µH SUMIDA CDRH 127-6R8MC
Q1 = Q4 = Si4410DY or 1RF7413
C1 = C2 = 2X SANYO OS-CON 10 SA220M
C3 = 4X SANYO OS-CON 30SC10M
*VL DIODES AND OUTPUT SCHOTTKY DIODES REQUIRED
FOR THE MAX1631 ONLY (SEE OUTPUT OVERVOLTAGE PROTECTION
AND OUTPUT UNDERVOLTAGE SHUTDOWN PROTECTION SECTIONS).
Figure 10. Dual, 4A, Notebook Computer Power Supply
26 ______________________________________________________________________________________
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
