MAX5028EUT+T Maxim Integrated Products, MAX5028EUT+T Datasheet - Page 11

• Manufacturer Part Number: MAX5028EUT+T
• Description: IC DC-DC CONV PWM SOT23-6
• Manufacturer: Maxim Integrated Products
• Type: Step-Up (Boost)r

Specifications of MAX5028EUT+T

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: 3 ~ 36 V
• Current - Output: 40mA
• Frequency - Switching: 500kHz
• Voltage - Input: 3 ~ 11 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: SOT-23-6
• Power - Output: 695.7mW
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: MAX5028EUT+T; MAX5028EUT+TTR

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.
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.
Figure 2. Adjustable 30V Output Circuit
Figure 3. Adjustable 30V Output Circuit with RC Filter
V
CC
V
CC
______________________________________________________________________________________
= 4.5V TO 11V
= 3V TO 11V
(MAX5025)
(MAX5026)
V
CC
V
CC
= 4.5V TO 11V
= 3V TO 11V
(MAX5025)
(MAX5026)
C1
4.7μF
Inductor Layout
C1
4.7μF
V
SHDN
PGND
CC
MAX5025
MAX5026
47μH
500kHz, 36V Output, SOT23,
GND
L1
V
SHDN
PGND
CC
MAX5025
MAX5026
Step-Up DC-DC Converters
TOKO 47μH INDUCTOR
A915BY-470M
47μH
LX
FB
GND
L1
TOKO 47μH INDUCTOR
A915BY-470M
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.
LX
FB
D1
ZETEX SCHOTTKY DIODE
ZHCS500
D1
R1
147kΩ
R2
6.34kΩ
ZETEX SCHOTTKY DIODE
ZHCS500
R1
147kΩ
R2
6.34kΩ
30V Boost Application Circuit
C2
1μF
100Ω
R3
C2
C2
1μF
1μF
V
+30V
OUT
C3
1μF
V
+30V
OUT
11