Rainbow Electronics MAX1635 - Manual (Page 10)

MAX1630–MAX1635
Multi-Output, Low-Noise Power-Supply
Controllers for Notebook Computers
10 ______________________________________________________________________________________
LPF
60kHz
REF
1.75V
2.68V
2.388V
R3
R4
-
+
+
-
4.5V
REF
2.5V
REF
200kHz
TO
300kHz
OSC
5V
PWM
LOGIC
5V
LINEAR
REG
VL
BST3
DH3
LX3
DL3
+3.3V
VL
ON/OFF
INPUT
+5V ALWAYS ON
CSL5
SHDN V+ SYNC
12V
LINEAR
REG
+12V
13V
BST5 RAW +15V
DH5
DL5
VL
PGND
CSH5
CSL5
CSH3
CSL3
FB5
RESET
SEQ
2.6V
1V
0.6V 0.6V
VL
GND RUN/ON3
TIME/ON5
REF
LX5
+5V
12OUT
V DD
IN
SECFB
3.3V
PWM
LOGIC
REF
OUTPUTS
UP
-
+ -
+
+
-
-
+
-
+
+
-
+
-
LPF
60kHz
TIMER
POWER-ON
SEQUENCE
LOGIC
R1
R2
FB3
-
+
+
-
MAX1632
OV/UV
FAULT
Figure 2. MAX1632 Block Diagram