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
0–MAX1635
_____________________________________________________________Ap p lic a t io n Circ u it s (c o n t in u e d )
*
*
TO +3.3V OUTPUT
TO +5V OUTPUT
C4
INPUT
+6.5V TO +28V
C3
10Ω
0.1µF
4.7µF
+5V ALWAYS ON
ON/OFF
0.1µF
4.7µF
23
22
V+
6
21
VL
SHDN
SYNC
+12V AT 120mA
4
5
12OUT
2.2µF
V
DD
D2
D1
2.2µF
D5
25
18
16
BST3
DH3
BST5
DH5
Q1
Q3
27
L1
0.1µF
+3.3V OUTPUT (3A)
C1
R2
+5V OUTPUT (3A)
C2
*
0.1µF
0.1µF
26
24
17
19
20
T2
1:2.2
LX5
R1
LX3
DL3
MAX1632
MAX1635
0.1µF
*
DL5
Q2
Q4
PGND
1N5819
1N5819
1
14
13
12
CSH3
CSL3
FB3
CSH5
CSL5
FB5
2
3
15
9
28
7
3V ON/OFF
SEQ
REF
RUN/ON3
TIME/ON5
+2.5V REF
5V ON/OFF
1µF
11
RESET
POWER-GOOD
SKIP
10
GND
8
R1 = R2 = 20mΩ
L1 = 10µH SUMIDA CDRH125-100
T2 = 10µH 1:2.2 TRANSFORMER
TRANSPOWER TECHNOLOGIES TTI-5870
Q1–Q4 = Si4410DY or IRF7413
C1 = 3 x 220µF 10V SPRAGUE 594D227X0010D2T
C2 = 2 x 220µF 10V SPRAGUE 594D227X0010D2T
C3 = C4 = 2 x 10µF 30V SANYO OS-CON 30SC10M
*VL DIODES AND OUTPUT SCHOTTKY DIODES REQUIRED
FOR THE MAX1632 ONLY (SEE OUTPUT OVERVOLTAGE PROTECTION
AND OUTPUT UNDERVOLTAGE SHUTDOWN PROTECTION SECTIONS).
Figure 9. Triple-Output Application for High-Voltage Batteries (MAX1632/MAX1635)
______________________________________________________________________________________ 25
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
