Rainbow Electronics MAX669 - Manual (Page 17)

Chip Information
TRANSISTOR COUNT: 1861
MAX668/MAX669
1.8V to 28V Input, PWM Step-Up
Controllers in µMAX
______________________________________________________________________________________ 17
MAX668
LDO
CS+
FB
SHDN
PGND
FREQ REF
V CC
GND
T1
2:1
EXT
V IN = +5V
T1: COILTRONICS CTX03-14232
+5V @ 400mA
+5V RETURN
0.1 Ω
R2
301k
1%
510 Ω
TLV431 610 Ω 0.068 µ F
R3
100k
1%
MBR0540L
MBR0540L
47 µ H
220 µ F
10V
0.22 µ F
1 µ F
100k
10k
MOC211
IRF7603
220 µ F
10V
0.1 µ F
Figure 7. Isolated +5V to +5V at 400mA Power Supply