MAX1790 Maxim, MAX1790 Datasheet - Page 10

• Manufacturer Part Number: MAX1790
• Description: Low-Noise Step-Up DC-DC Converter
• Manufacturer: Maxim

for secondary outputs (V2 and V3) depends on the load
characteristics of all three outputs.
Good PC board layout and routing are required in high-
frequency switching power supplies to achieve good
regulation, high efficiency, and stability. It is strongly
recommended that the evaluation kit PC board layouts
be followed as closely as possible. Place power com-
ponents as close together as possible, keeping their
traces short, direct, and wide. Avoid interconnecting
the ground pins of the power components using vias
through an internal ground plane. Instead, keep the
power components close together and route them in a
“star” ground configuration using component-side
coper, then connect the star ground to internal ground
using multiple vias.
TRANSISTOR COUNT: 1012
Low-Noise Step-Up DC-DC Converter
10
______________________________________________________________________________________
Chip Information
Layout Procedure
Figure 3. MAX1790 in a SEPIC Configuration
0.027µF
V
2.6V TO 5.5V
IN
C
COMP2
56pF
SHDN
SS
FREQ
MAX1790
CC
IN
R
22k
C
330pF
GND
COMP
COMP
LX
FB
5.3µH
L1A
R2
605k
10µF
5.3µH
C2
L1B
L1 = CTX8-1P
C
OUT
= TPSD226025R0200
C1
10µF
10V
C
22µF
OUT
20V
D1
1M
R1
V
3.3V
OUT