LTC3589 Linear Technology, LTC3589 Datasheet - Page 22

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

OPERATION
LTC3589
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 PV
recommended ceramic capacitor manufacturers.
BUCK-BOOST SWITCHING REGULATOR
Output Voltage Programming
Set the output voltage of the LTC3589 buck-boost switch-
ing regulator using an external resistor divider connected
from BB_OUT to the feedback pin BB_FB and to GND as
shown in Figure 4.
22
V
BB_OUT
= 0.8 • 1+
Table 7. Inductors for Step-Down Switching Regulator 1
MANUFACTURERS
Coilcraft
Cooper
Sumida
TDK
TOKO
Tokin
Wurth
R2
R1
IN
(V)
pin. Refer to Table 11 for
VLCF5020T-2R2N2R6-1
VLF5014ST-1R0N2R7
VLF5014st-2R2N2R3
CDRH5D16NP-3R3N
XPL4020-222ML
LPS6225-222ML
LPS6225-332ML
LPS6225-472ML
XPL4020-102ML
XPL4020-152ML
H-DI-0520-2R2
H-DI-0630-2R4
H-DI-0630-3R8
PART NUMBER
1124BS-1R2N
1124BS-1R8N
SD14-2R0-R
SD25-2R2-R
7440530047
7440430022
SD14-1R2-R
SD14-1R5-R
744042001
744052002
744053003
VALUE
(μH)
2.2
2.2
3.3
2.0
2.2
3.3
2.2
2.2
2.2
2.4
3.8
2.5
3.0
2.2
1.0
1.5
4.7
1.2
1.5
1.0
1.2
1.8
1.0
4.7
DCR (Ω)
Figure 4. Buck-Boost Switching Regulator Application Circuit
0.029
0.036
0.060
0.045
0.055
0.065
0.034
0.039
0.045
0.031
0.045
0.050
0.073
0.047
0.056
0.048
0.028
0.040
0.028
0.030
0.030
0.023
0.071
0.024
EN
MODE
CURRENT (A)
PV
A
SW4AB
B
MAX DC
IN4
3.60
2.60
3.90
3.50
3.00
3.35
2.56
2.80
2.60
2.60
4.00
2.91
2.7
2.3
2.6
2.9
2.7
2.6
2.5
2.4
2.8
2.4
2.5
2
CONTROL
PWM
BB_OUT
SW4CD
+
–
SIZE (mm) W × L × H
D
C
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
6.0 × 6.0 × 2.0
5.2 × 5.2 × 2.5
5.6 × 5.6 × 1.8
4.8 × 4.6 × 1.4
4.8 × 4.6 × 1.4
5.0 × 5.0 × 2.0
5.3 × 5.3 × 2.0
6.3 × 6.3 × 3.0
6.3 × 6.3 × 3.0
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
4.5 × 4.7 × 1.8
4.5 × 4.7 × 1.8
0.8V
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BB_FB
3589 F04
R1
R2
3589p
22μF