LTC3589 Linear Technology, LTC3589 Datasheet - Page 25

• Manufacturer Part Number: LTC3589
• Description: 8-Output Regulator
• Manufacturer: Linear Technology

OPERATION
at least two times larger than the maximum load current to
ensure that the inductor does not saturate during normal
operation. If output short circuit is a possible condition,
the inductor should be rated to handle the maximum peak
current specifi ed for the buck-boost converter. Table 9
shows several inductors that work well with the LTC3589
buck-boost regulator.
Capacitor Selection
Low ESR ceramic capacitors should be used at both the
output and input supply of the buck-boost switching
regulator. Only X5R or X7R ceramic capacitors should
be used because they retain their capacitance over wider
voltage and temperature ranges than other ceramic types.
Table 10. Inductors for Buck-Boost Switching Regulator
MANUFACTURERS
Coilcraft
Cooper
Sumida
TDK
TOKO
Tokin
Wurth
VLCF5020T-2R7N2R2-1
VLCF5020T-3R3N2R0-1
VLF5014ST-2R2N2R3
CDRH5D16NP-3R3N
CDRH5D16NP-4R7N
XPL4020-222ML
XPL4020-332ML
LPS6225-332ML
LPS6225-472ML
XPL4020-152ML
H-DI-0520-3R3
H-DI-0630-3R8
1124BS-1R8N
1124BS-3R3N
SD14-2R0-R
SD14-3R2-R
SD25-3R3-R
7440530047
SD14-1R5-R
SD14-2R5-R
7440420027
744052002
744053003
NUMBER
PART
VALUE
(μH)
2.2
3.3
3.3
4.7
2.0
2.5
3.2
3.3
3.3
4.7
2.2
2.7
3.3
3.3
3.3
3.8
2.5
2.7
3.0
4.7
1.5
1.5
1.8
A 22μF capacitor is suffi cient for the buck-boost switch-
ing regulator output. For good transient response and
stability the output capacitor should retain at least 10μF of
capacitance over operating temperature and bias voltage.
Place at least 4.7μF decoupling capacitance as close as
possible to PV
ceramic capacitor manufacturers.
Table 11. Ceramic Capacitor Manufacturers
AVX
Murata
Taiyo Yuden
Vishay Siliconix
TDK
DCR (Ω)
0.036
0.060
0.085
0.055
0.065
0.039
0.045
0.060
0.066
0.038
0.045
0.064
0.073
0.083
0.096
0.056
0.062
0.040
0.030
0.047
0.030
0.074
0.024
CURRENT (A)
MAX DC
IN4
3.60
2.60
2.40
3.50
3.00
2.91
2.56
2.29
2.00
2.21
2.60
2.05
2.70
2.00
2.00
2.10
2.3
2.2
2.4
2.2
2.8
2.4
2
pin. Refer to Table 11 for recommended
www.avxcorp.com
www.murata.com
www.t-yuden.com
www.vishay.com
www.tdk.com
SIZE (mm) W × L × H
5.2 × 5.2 × 1.45
5.2 × 5.2 × 1.45
5.2 × 5.2 × 1.45
5.2 × 5.2 × 1.45
4.2 × 4.2 × 2.0
4.2 × 4.2 × 2.0
4.2 × 4.2 × 2.0
6.0 × 6.0 × 2.0
6.0 × 6.0 × 2.0
4.8 × 4.8 × 2.5
5.6 × 5.6 × 1.8
5.6 × 5.6 × 1.8
5.0 × 5.0 × 2.0
5.0 × 5.0 × 2.0
5.3 × 5.3 × 2.0
6.3 × 6.3 × 3.0
5.8 × 5.8 × 1.8
5.8 × 5.8 × 2.8
5.8 × 5.8 × 2.8
4.8 × 4.6 × 1.4
4.5 × 4.7 × 1.8
4.5 × 4.7 × 1.8
4.8 × 4.8 × 1.8
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LTC3589
25
3589p