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参数资料
| 型号： | LTC3589EUJ#PBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING REGULATOR, 2600 kHz SWITCHING FREQ-MAX, PQCC40 |
| 封装： | 6 X 6 MM, 0.75 MM HEIGHT, LEAD FREE, PLASTIC, QFN-40 |
| 文件页数： | 16/46页 |
| 文件大小： | 570K |
| 代理商： | LTC3589EUJ#PBF |
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LTC3589/LTC3589-1
23
3589fc
OPERATION
Table 8. Inductors for Step-Down Switching Regulator 1
MANUFACTURERS
PART NUMBER
VALUE
(μH)
DCR (Ω)
MAX DC
CURRENT (A)
SIZE (mm) W
× L × H
Coilcraft
XPL4020-102ML
XPL4020-152ML
XPL4020-222ML
LPS6225-222ML
LPS6225-332ML
LPS6225-472ML
1.0
1.5
2.2
3.3
4.7
0.029
0.036
0.060
0.045
0.055
0.065
4.00
3.60
2.60
3.90
3.50
3.00
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
6.0
× 6.0 × 2.0
Cooper
SD14-1R2-R
SD14-1R5-R
SD14-2R0-R
SD25-2R2-R
1.2
1.5
2.0
2.2
0.034
0.039
0.045
0.031
3.35
2.91
2.56
2.80
5.2
× 5.2 × 1.45
5.2
× 5.2 × 1.45
5.2
× 5.2 × 1.45
5.2
× 5.2 × 2.5
Sumida
CDRH5D16NP-3R3N
3.3
0.045
2.60
5.6
× 5.6 × 1.8
TDK
VLF5014ST-1R0N2R7
VLF5014st-2R2N2R3
VLCF5020T-2R2N2R6-1
1.0
2.2
0.050
0.073
0.071
2.7
2.3
2.6
4.8
× 4.6 × 1.4
4.8
× 4.6 × 1.4
5.0
× 5.0 × 2.0
TOKO
1124BS-1R2N
1124BS-1R8N
1.2
1.8
0.047
0.056
2.9
2.7
4.5
× 4.7 × 1.8
4.5
× 4.7 × 1.8
Tokin
H-DI-0520-2R2
H-DI-0630-2R4
H-DI-0630-3R8
2.2
2.4
3.8
0.048
0.028
0.040
2.6
2.5
2
5.3
× 5.3 × 2.0
6.3
× 6.3 × 3.0
6.3
× 6.3 × 3.0
Wurth
744042001
744052002
744053003
7440530047
7440430022
1.0
2.5
3.0
4.7
2.2
0.028
0.030
0.024
0.030
0.023
2.60
2.4
2.8
2.4
2.5
4.8
× 4.8 × 1.8
5.8
× 5.8 × 1.8
5.8
× 5.8 × 2.8
5.8
× 5.8 × 2.8
4.8
× 4.8 × 2.8
An inductor with low DC resistance will improve converter
efciency. Select an inductor with a DC current rating at least
1.5 times larger than the maximum load current to ensure
the inductor does not saturate during normal operations.
If short-circuit is a possible condition, the inductor should
be rated to handle the maximum peak current specied
for the step-down converter. Table 8 shows inductors that
work well with the step-down switching regulators.
Input/Output Capacitor Selection
Low ESR (equivalent series resistance) ceramic capacitors
should be used at both the output and input supply of the
switching regulators. Only X5R or X7R ceramic capacitors
should be used because they retain their capacitance over
wider voltage and temperature ranges than other ceramic
types. A 22μF capacitor is sufcient for the step-down
switching regulator outputs. 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 each PVIN pin. Refer to Table 12 for
recommended ceramic capacitor manufacturers.
BUCK-BOOST SWITCHING REGULATOR
Output Voltage Programming
Set the output voltage of the LTC3589/LTC3589-1 buck-
boost switching regulator using an external resistor divider
connected from BB_OUT to the feedback pin BB_FB and
to GND, as shown in Figure 4.
VBB_OUT = 0.8 1+
R1
R2
(V)
The value of R1 plays a role in setting the dynamics of the
buck-boost voltage mode control loop. In general, a larger
value for R1 will increase stability but reduce the speed of
the transient response. A good starting point is to choose
R1 equal to 1MΩ and calculate the value of R2 needed to set
the target output voltage. If a large output capacitor is used,
the bandwidth of the converter is reduced and R1 may be
reduced to improve transient response. If a large inductor
or small output capacitor is used then a larger R1 should
be used to bring the loop toward more stable operation.
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