LTC3589 datasheet(40/50 Pages) LINER

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LTC3589/LTC3589-1/

LTC3589-2

3589fe

OPERATION

Table 17. LTC3589 Command Register Table

REG

NAME

B[7]

B[6]

B[5]

B[4]

B[3]

B[2]

B[1]

B[0]

DEFAULT

0x26

B2DTV1 Unused

PGOOD

Mask:

0 = PGOOD

Low When

Slewing

1 = PGOOD

Not Forced

Low When

Slewing.

Step-Down Switching Regulator 2 Feedback Reference Input (V1)

00000 = 362.5mV

11001 = 675mV

11111 = 750mV

12.5mV Step Size

0001 1001

0x27

B2DTV2 Keep-Alive

Mode:

0 = Normal

Shutdown

1 = Keep-Alive

Phase

Select:

0 = Clock

Phase 1

1 = Clock

Phase 2

Step-Down

Switching

Regulator 2

Clock Rate

0 = 2.25MHz

1 = 1.125MHz

Step-Down Switching Regulator 2 Feedback Reference Input (V2)

00000 = 362.5mV

11001 = 675mV

11111 = 750mV

12.5mV Step Size

0001 1001

0x29

B3DTV1 Unused

PGOOD

Mask:

0 = PGOOD

Low When

Slewing

1 = PGOOD

Not Forced

Low When

Slewing.

Step-Down Switching Regulator 3 Feedback Reference Input (V1)

00000 = 362.5mV

11001 = 675mV

11111 = 750mV

12.5mV Step Size

0001 1001

0x2A

B3DTV2 Keep-Alive

Mode:

0 = Normal

Shutdown

1 = Keep-Alive

Phase

Select:

0 = Clock

Phase 1

1 = Clock

Phase 2

Step-Down

Switching

Regulator 3

Clock Rate

0 = 2.25MHz

1 = 1.125MHz

Step-Down Switching Regulator 3 Feedback Reference Input (V2)

00000 = 362.5mV

11001 = 675mV

11111 = 750mV

12.5mV Step Size

0001 1001

0x32

L2DTV1 Keep-Alive

Mode:

0 = Normal

Shutdown

1 = Keep-Alive

Unused

PGOOD

Mask:

0 = PGOOD

Low When

Slewing

1 = PGOOD

Not Changed

When

Slewing.

LDO 2 Feedback Reference Input (V1)

00000 = 362.5mV

11001 = 675mV

11111 = 750mV

12.5mV Step Size

0001 1001

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