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LTC3589EUJ-PBF 数据表(PDF) 23 Page - Linear Technology

部件名 LTC3589EUJ-PBF
功能描述  8-Output Regulator with Sequencing and I2C
Download  44 Pages
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制造商  LINER [Linear Technology]
网页  http://www.linear.com
标志 LINER - Linear Technology

LTC3589EUJ-PBF 数据表(HTML) 23 Page - Linear Technology

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LTC3589
23
3589p
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.
Modes of Operations
Table 9 shows the I2C command registers used to control
the operating modes of the LTC3589 buck-boost converter.
When command register SCR1 bit 6 is LOW, the LTC3589
buck-boost switching regulator operates in a fixed fre-
quency pulse width modulation mode using voltage mode
feedback control. A proprietary switching algorithm allows
the converter to transition between buck, buck-boost, and
boost modes without discontinuity in inductor current or
loop characteristics. The switch topology is shown in the
application circuit in Figure 4.
Table 9. Buck-Boost Command Register Settings
COMMAND
REGISTER[BIT]
VALUE
SETTING
SCR1[6]
0*
1
Continuous Mode
Burst Mode Operation
OVEN[3]
0*
1
Disable
Enable
SCR2[3]
0*
1
Wait for Output Below 300mV Before Enable
Enable Immediately
* Denotes Default Power-On Value
When the input voltage is significantly greater than the
output voltage, the buck-boost converter operates in
buck mode. Switch D turns on continuously and switch C
remains off. Switches A and B are pulse width modulated
to produce the required duty cycle to support the output
OPERATION
Table 8. Inductors for Step-Down Switching Regulators 2 and 3
MANUFACTURERS
PART NUMBER
VALUE
(μH)
DCR (Ω)
MAX DC
CURRENT (A)
SIZE (mm) W × L × H
Coilcraft
XPL4020-102ML
XPL4020-152ML
XPL4020-472ML
1.0
1.5
4.7
0.029
0.036
0.130
4.00
3.60
1.90
4.2 × 4.2 × 2.0
4.2 × 4.2 × 2.0
4.2 × 4.2 × 2.0
Cooper
SD14-1R2-R
SD14-3R2-R
SD25-3R3-R
1.2
3.2
3.3
0.034
0.066
0.038
3.35
2.00
2.21
5.2 × 5.2 × 1.45
5.2 × 5.2 × 1.45
4.8 × 4.8 × 2.5
Sumida
CDRH5D16NP-4R7N
CDRH38D16RHPNP-3R3M
4.7
3.3
0.064
0.059
2.05
1.46
5.6 × 5.6 × 1.8
4.2 × 4.2 × 1.8
TDK
VLF5014ST-2R2N2R3
VLCF5020T-2R7N2R2-1
VLCF5020T-3R3N2R0-1
2.2
2.7
3.3
0.073
0.083
0.096
2.3
2.2
2
4.8 × 4.6 × 1.4
5.0 × 5.0 × 2.0
5.0 × 5.0 × 2.0
TOKO
1124BS-2R4N
1124BS-3R3N
2.4
3.3
0.065
0.074
2.30
2.10
4.5 × 4.7 × 1.8
4.5 × 4.7 × 1.8
Tokin
H-DI-0520-3R3
H-DI-0520-4R7
H-DI-0630-3R8
H-DI-0630-4R7
3.3
4.7
3.8
4.7
0.062
0.090
0.040
0.043
2.00
1.80
2.00
1.90
5.3 × 5.3 × 2.0
5.3 × 5.3 × 2.0
6.3 × 6.3 × 3.0
6.3 × 6.3 × 3.0
Wurth
744043004
744052002
7440530047
744042003
7440430022
4.7
2.5
4.7
3.3
2.2
0.052
0.030
0.030
0.055
0.023
1.55
2.4
2.4
1.95
2.5
5.0 × 5.0 × 3.0
5.8 × 5.8 × 1.8
5.8 × 5.8 × 2.8
4.8 × 4.8 × 1.8
4.8 × 4.8 × 2.8


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