LTC3375

27

3375fa

For more information www.linear.com/3375

applicaTions inForMaTion

Table 7. Global Buck Regulator Program Register Bit Format

Bit7

ENABLE

Default is ‘0’ which disables the part. A buck regulator can also be enabled via its enable pin. When enabled via

Bit6

MODE

Default is ‘0’ which is Burst Mode operation. A ‘1’ programs the regulator to operate in forced continuous mode.

Bit5(PHASE1)

Bit4(PHASE0)

Phase Control

Default varies per converter. ‘00’ programs a SW HIGH transition to coincide with the internal clock rising edge.

‘01’ programs a 90° offset, ’10’ programs a 180° offset, and ‘11’ programs a 270° offset.

Bit3(DAC3)

Bit2(DAC2)

Bit1(DAC1)

Bit0(DAC0)

DAC Control

These bits are used to program the feedback regulation voltage. Default is ‘1100’ which programs a voltage of

725mV. Bits ‘0000’ program the lowest feedback regulation of 425mV, and ‘1111’ programs a full-scale voltage of

800mV. An LSB (DAC0) has a bit weight of 25mV.

Table 4. Recommended Inductors for 2A Buck Regulators

PART NUMBER

L (µH)

MAX DCR (mΩ)

SIZE IN mm (L

× W × H) MANUFACTURER

XFL4020-102ME

1.0

5.1

11.9

4

× 4 × 2.1

CoilCraft

74437324010

1

9

27

4.45

× 4.06 × 1.8

Wurth Elektronik

XAL4020-222ME

2.2

5.6

38.7

4

× 4 × 2.1

CoilCraft

FDV0530-2R2M

2.2

5.3

15.5

6.2

× 5.8 × 3

Toko

IHLP2020BZER2R2M-11

2.2

5

37.7

5.49

× 5.18 × 2

Vishay

XAL4030-332ME

3.3

5.5

28.6

4

× 4 × 3.1

CoilCraft

FDV0530-3R3M

3.3

4.1

34.1

6.2

× 5.8 × 3

Toko

Table 5. Recommended Inductors for 3A Buck Regulators

PART NUMBER

L (µH)

MAX DCR (mΩ)

SIZE IN mm (L

× W × H) MANUFACTURER

XAL4020-102ME

1.0

8.7

14.6

4

× 4 × 2.1

CoilCraft

FDV0530-1R0M

1

8.4

11.2

6.2

× 5.8 × 3

Toko

XAL5030-222ME

2.2

9.2

14.5

5.28

× 5.48 × 3.1

CoilCraft

IHLP2525CZER2R2M-01

2.2

8

20

6.86

× 6.47 × 3

Vishay

74437346022

2.2

6.5

20

7.3

× 6.6 × 2.8

Wurth Elektonik

XAL5030-332ME

3.3

8.7

23.3

5.28

× 5.48 × 3.1

CoilCraft

SPM6530T-3R3M

3

7.3

27

7.1

× 6.5 × 3

TDK

Table 6. Recommended Inductors for 4A Buck Regulators

PART NUMBER

L (µH)

MAX DCR (mΩ)

SIZE IN mm (L

× W × H) MANUFACTURER

XAL5030-122ME

1.2

12.5

9.4

5.28

× 5.48 × 3.1

CoilCraft

SPM6530T-1R0M120

1

14.1

7.81

7.1

× 6.5 × 3

TDK

XAL5030-222ME

2.2

9.2

14.5

5.28

× 5.48 × 3.1

CoilCraft

SPM6530T-2R2M

2.2

8.4

19

7.1

× 6.5 × 3

TDK

IHLP2525EZER2R2M-01

2.2

13.6

20.9

6.86

× 6.47 × 5

Vishay

XAL6030-332ME

3.3

8

20.81

6.36

× 6.56 × 3.1

CoilCraft

FDVE1040-3R3M

3.3

9.8

10.1

11.2

× 10 × 4

Toko