Rainbow Electronics MAX1865 - Manual (Page 12)

MAX1864/MAX1865
xDSL/Cable Modem Triple/Quintuple Output
Power Supplies
12 ______________________________________________________________________________________
∑
BIAS
OK
V REF
1.114V
THERMAL
SHDN
3.5V
IN
VL LDO
5V
VL
BST
DH
LX
DL
GND
100k Ω
400k Ω
ILIM
0.9 ✕ VL
POK
ENABLE
250mV
A V = 5
500mV
FB5*
B5*
*MAX1865 ONLY
OUT
0.9V REF
FB1
0.9V REF
B_
FB_ 100mV
FB
OUT
COMP
FB1
SOFT-
START
V REF
1.236V
CLK
SLOPE
COMP
A V = 5
ENABLE
MAX1864
MAX1865
Figure 2. Functional Diagram