LTC3589 datasheet(24/50 Pages) LINER

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LTC3589/LTC3589-1/

LTC3589-2

3589fe

OPERATION

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.

VBB_OUT = 0.8 • 1+

(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.

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

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

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