MAX5025(2001) 查看數據表（PDF） - Maxim Integrated
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MAX5025 Datasheet PDF : 13 Pages
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500kHz, 36V Output, SOT23, PWM Step-Up
DC-DC Converters
trace lengths to reduce stray capacitance, trace resis-
tance, and radiated noise. The trace between the out-
put voltage-divider (MAX5025/MAX5026) and the FB
pin must be kept short, as well as the trace between
GND and PGND.
Inductor Layout
The shielded drum type inductors have a small air gap
around the top and bottom periphery. The incident fring-
ing magnetic field from this air gap to the copper plane
on the PC board tends to reduce efficiency. This is a
result of the induced eddy currents on the copper plane.
To minimize this effect, avoid laying out any copper
planes under the mounting area of these inductors.
30V Boost Application Circuit
Figures 2 and 3 show the MAX5025/MAX5026 operat-
ing in a 30V boost application. Figure 3 has an RC filter
to reduce noise at the output. These circuits provide
output currents greater than 4mA with an input voltage
of 5V or greater. They are designed by following the
Design Procedure section. Operating characteristics of
these circuits are shown in the Typical Operating
Characteristics section.
____________________Chip Information
TRANSISTOR COUNT: 365
PROCESS: BiCMOS
VCC = 4.5V TO 11V
(MAX5025)
VCC = 3V TO 11V
(MAX5026)
C1
4.7µF
L1 TOKO 47µH INDUCTOR
47µH A915BY-470M ZETEX SCHOTTKY DIODE
D1 ZHCS500
VCC
LX
VOUT
+30V
MAX5025
MAX5026
SHDN
FB
R1
147kΩ
C2
1µF
PGND GND
R2
6.34kΩ
Figure 2. Adjustable 30V Output Circuit
VCC = 4.5V TO 11V
(MAX5025)
VCC = 3V TO 11V
(MAX5026)
C1
4.7µF
L1 TOKO 47µH INDUCTOR
47µH A915BY-470M ZETEX SCHOTTKY DIODE R3
D1 ZHCS500
100Ω
VCC
LX
MAX5025
MAX5026
SHDN
FB
PGND GND
R1
147kΩ
C2
1µF
R2
6.34kΩ
VOUT
+30V
C3
1µF
Figure 3. Adjustable 30V Output Circuit with RC Filter
______________________________________________________________________________________ 11
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