MAX1896 Ver la hoja de datos (PDF) - Maxim Integrated
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componentes Descripción
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MAX1896 Datasheet PDF : 10 Pages
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1.4MHz SOT23 Current-Mode
Step-Up DC-DC Converter
Application Circuits
1-Cell to 3.3V SEPIC Power Supply
Figure 4 shows the MAX1896 in a single-ended primary
inductance converter (SEPIC) topology. This topology
is useful when the input voltage can be either higher or
lower than the output voltage, such as when converting
a single lithium-ion (Li+) cell to a 3.3V output. L1 and
L2 are two windings on a single inductor or two sepa-
rate inductors. The coupling capacitor between these
two windings must be a low-ESR type to achieve maxi-
mum efficiency, and must also be able to handle high
ripple currents. Ceramic capacitors are best for this
application.
Layout Procedure
Good PC board layout and routing are required in high-
frequency switching power supplies to achieve good
regulation, and stability. It is strongly recommended
that the evaluation kit PC board layouts be followed as
closely as possible. Refer to the MAX1896 EV kit for a
good layout. Place power components as close togeth-
er 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 configu-
ration using component side copper, then connect the
star ground to internal ground using multiple vias.
VIN
2.6V TO 4.5V
ON/OFF
CSS
33nF
CIN
C1
L
10µF
10µH
10V
SUMIDA
CD43-100
IN
SHDN
LX
MAX1896
NIHON
EC10QSO2L
0.1µF
GND
SS
FB
R1
R2 36kΩ
12kΩ
C2
0.1µF
VOUT
5V
COUT
22µF
16V
Chip Information
TRANSISTOR COUNT: 970
Figure 1. Typical Application Circuit
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