LTC3589 datasheet(27/50 Pages) LINER

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LTC3589/LTC3589-1/

LTC3589-2

3589fe

Table 11. Inductors for Buck-Boost Switching Regulator

MANUFACTURERS

PART

NUMBER

VALUE

(μH)

DCR (Ω)

MAX DC

CURRENT (A)

SIZE (mm) W × L × H

Coilcraft

XPL4020-152ML

XPL4020-222ML

XPL4020-332ML

LPS6225-332ML

LPS6225-472ML

1.5

2.2

3.3

4.7

0.036

0.060

0.085

0.055

0.065

3.60

2.60

2.40

3.50

3.00

4.2 × 4.2 × 2.0

6.0 × 6.0 × 2.0

Cooper

SD14-1R5-R

SD14-2R0-R

SD14-2R5-R

SD14-3R2-R

SD25-3R3-R

1.5

2.0

2.5

3.2

3.3

0.039

0.045

0.060

0.066

0.038

2.91

2.56

2.29

2.00

2.21

5.2 × 5.2 × 1.45

4.8 × 4.8 × 2.5

Sumida

CDRH5D16NP-3R3N

CDRH5D16NP-4R7N

3.3

4.7

0.045

0.064

2.60

2.05

5.6 × 5.6 × 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

4.8 × 4.6 × 1.4

5.0 × 5.0 × 2.0

TOKO

1124BS-1R8N

1124BS-3R3N

1.8

3.3

0.056

0.074

2.70

2.10

4.5 × 4.7 × 1.8

Tokin

H-DI-0520-3R3

H-DI-0630-3R8

3.3

3.8

0.062

0.040

2.00

5.3 × 5.3 × 2.0

6.3 × 6.3 × 3.0

Wurth

744052002

7440420027

744053003

7440530047

2.5

2.7

3.0

4.7

0.030

0.047

0.024

0.030

2.4

2.2

2.8

2.4

5.8 × 5.8 × 1.8

4.8 × 4.8 × 1.8

5.8 × 5.8 × 2.8

Inductor Selection

Inductor selection criteria for the buck-boost are similar to

those given for the step-down switching regulators. The

buck-boost converter is designed to work with inductors

in the range of 1μH to 3.3μH. For most applications use a

1.5μH inductor. Choose an inductor with a DC current rating

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 specified for the buck-boost converter. Table 10

shows several inductors that work well with the LTC3589

buck-boost regulator.

Table 10. Buck-Boost Command Register Settings

COMMAND

VALUE SETTING

SCR1[6]

Continuous Mode

Burst Mode Operation

OVEN[3]

Disable

Enable

SCR2[3]

LTC3589/LTC3589-1

Wait for Output Below 300mV Before Enable

Enable Immediately

SCR2[3]

LTC3589-2

Enable Immediately

Wait for Output Below 300mV Before Enable

* Denotes Default Power-On Value

OPERATION

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