MP1522 Просмотр технического описания (PDF) - Monolithic Power Systems
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MP1522 Datasheet PDF : 7 Pages
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MP1522 – 25V STEP-UP CONVERTER IN A SOT23-5 PACKAGE
Diode
The high switching frequencies of the MP1522
require the use of fast recovery or Schottky
barrier diodes. In low voltage applications
Schottky barrier diodes are recommended for
maximum efficiency. The reverse breakdown
voltage should be approximately 1.5X the
output voltage.
Printed Circuit Board Layout
The printed circuit board layout is important in
order to minimize noise and prevent erratic
operation. Keep the ground leads short and
robust with minimum lead lengths between the
input and output capacitors and ground. Place
the feedback resistive voltage divider as close
to FB as possible to prevent switching noise
injection into FB. The use of surface mount
capacitors with their low ESL is required to
minimize noise at the MP1522. Use separate
power and quiet ground planes connected
together at a single point whenever possible to
minimize.ground.bounce.
Table 1—Output Current vs. Input Voltage
VIN (V)
3.3
VOUT (V)
5
IOUT (mA)
67
3.3
12
28
3.3
18
15
3.3
25
10
5
12
44
5
18
32
5
25
19
10
12
122
10
18
75
10
25
51
VIN
3.3V
OFF ON
4 EN
SW 1
MP1522 BIAS 5
2 GND
FB 3
D1
RB751
VOUT
20V
C2
1nF
Figure 2—Typical Boost Application
MP1522_TAC_F02
MP1522 Rev. 1.9
www.MonolithicPower.com
5
12/9/2005
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