LTC3589_1 Datasheet, PDF(38/46 Page) Linear Technology – 8-Output Regulator with Sequencing and I2C

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LTC3589_1 Datasheet, PDF (38/46 Pages) Linear Technology – 8-Output Regulator with Sequencing and I2C

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LTC3589

OPERATION

Table 16. LTC3589 Command Register Table

REG NAME B[7]

B[6]

B[5]

B[4]

B[3]

B[2]

B[1]

B[0]

0x24 B1DTV2 Keep-Alive

Mode:

Phase

Select:

0 = Normal 0 = Clock

Shutdown Phase 1

1 = Keep-Alive 1 = Clock

Phase 2

Step-Down

Switching

Regulator 1

Clock Rate

0 = 2.25MHz

1 = 1.12MHz

Step-Down Switching Regulator 1 Feedback Reference Input (V2)

00000 = 362.5mV

11001 = 675mV

11111 = 750mV

12.5mV Step Size

0x25 VRRCR LDO2 Dynamic Reference

Slew Rate:

Step-Down Switching

Regulator 3 Dynamic

Reference Slew Rate:

Step-Down Switching

Regulator 2 Dynamic

Reference Slew Rate:

Step-Down Switching

Regulator 1 Dynamic

Reference Slew Rate:

00 = 0.88mV/Âµs

01 = 1.75mV/Âµs

10 = 3.5mV/Âµs

11 = 7mV/Âµs

0x26 B2DTV1 Unused

00 = 0.88mV/Âµs

01 = 1.75mV/Âµs

10 = 3.5mV/Âµs

11 = 7mV/Âµs

00 = 0.88mV/Âµs

01 = 1.75mV/Âµs

10 = 3.5mV/Âµs

11 = 7mV/Âµs

00 = 0.88mV/Âµs

01 = 1.75mV/Âµs

10 = 3.5mV/Âµs

11 = 7mV/Âµs

PGOOD

Mask:

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

0x27 B2DTV2 Keep-Alive

Mode:

Phase

Select:

0 = Normal 0 = Clock

Shutdown Phase 1

1 = Keep-Alive 1 = Clock

Phase 2

0x29 B3DTV1 Unused

0 = PGOOD

Low When

Slewing

1 = PGOOD

Not Forced

Low When

Slewing.

00000 = 362.5mV

11001 = 675mV

11111 = 750mV

12.5mV Step Size

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

Switching

Regulator 2 00000 = 362.5mV

Clock Rate 11001 = 675mV

0 = 2.25MHz

11111 = 750mV

12.5mV Step Size

1 = 1.125MHz

PGOOD

Mask:

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

0x2A B3DTV2 Keep-Alive

Mode:

Phase

Select:

0 = Normal 0 = Clock

Shutdown Phase 1

1 = Keep-Alive 1 = Clock

Phase 2

0 = PGOOD

Low When

Slewing

00000 = 362.5mV

11001 = 675mV

11111 = 750mV

12.5mV Step Size

1 = PGOOD

Not Forced

Low When

Slewing.

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

Switching

Regulator 3 00000 = 362.5mV

Clock Rate 11001 = 675mV

0 = 2.25MHz

11111 = 750mV

12.5mV Step Size

1 = 1.125MHz

DEFAULT

0001 1001

1111 1111

0001 1001

3589fb

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