LTC3589 datasheet(39/50 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

0x12

LTC3589-2

SCR2

Mask PGOOD

Hard

Shutdown:

0 = Allow

PGOOD

Timeout Hard

Shutdown.

1 = Allow

PGOOD Hard

Shutdown.

LDO4

Start-Up:

0 = Don’t Wait

for Output <

300mV Before

Enable

1 = Wait for

Output < 300mV

Before Enable

LDO4

Start-Up:

0 = Don’t Wait

for Output <

300mV Before

Enable

1 = Wait for

Output <

300mV Before

Enable

LDO4

Start-Up:

0 = Don’t Wait

for Output <

300mV Before

Enable

1 = Wait for

Output <

300mV Before

Enable

LDO4

Start-Up:

0 = Don’t Wait

for Output <

300mV Before

Enable

1 = Wait for

Output <

300mV Before

Enable

LDO4

Start-Up:

0 = Don’t Wait

for Output <

300mV Before

Enable

1 = Wait for

Output <

300mV Before

Enable

LDO4

Start-Up:

0 = Don’t Wait

for Output <

300mV Before

Enable

1 = Wait for

Output <

300mV Before

Enable

LDO4

Start-Up:

0 = Don’t Wait

for Output

< 300mV

Before Enable

1 = Wait

for Output

< 300mV

Before Enable

0000 0000

0x20

VCCR

LDO2

Reference

Select:

0 =

L2DTV1[4-0]

1 =

L2DTV2[4-0]

Start LDO2

Slew:

0 = Went

1 = GO

Step-Down

Switching

Regulator 3

Reference

Select:

0 =

B3DTV1[4-0]

1 =

B3DTV2[4-0]2

Start

Step-Down

Switching

Regulator 3

Slew:

0 = Went

1= GO

Step-Down

Switching

Regulator 2

Reference

Select:

0 =

B2DTV1[4-0]

1 =

B2DTV2[4-0]

Start

Step-Down

Switching

Regulator 2

Slew:

0 = Went

1= GO

Step-Down

Switching

Regulator 1

Reference

Select:

0 =

B1DTV1[4-0]

1 =

B1DTV2[4-0]2

Start

Step-Down

Switching

Regulator 1

Slew:

0 = Went

1= GO

0000 0000

0x21

CLIRQ

0x23

B1DTV1 Step-Down Switching

Regulator Switch DV/DT

Control:

00 = 1ns

01 = 2ns

10 = 4ns

11 = 8ns

PGOOD

Mask:

0 = PGOOD

Low When

Slewing

1 = PGOOD

Not Forced

Low When

Slewing.

Step-Down Switching Regulator 1 Feedback Reference Input (V1)

00000 = 362.5mV

11001 = 675mV

11111 = 750mV

12.5mV Step Size

0001 1001

0x24

B1DTV2 Keep-Alive

Mode:

0 = Normal

Shutdown

1 = Keep-Alive

Phase

Select:

0 = Clock

Phase 1

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

0001 1001

0x25

VRRCR LDO2 Dynamic Reference

Slew Rate:

00 = 0.88mV/μs

01 = 1.75mV/μs

10 = 3.5mV/μs

11 = 7mV/μs

Step-Down Switching

Regulator 3 Dynamic

Reference Slew Rate:

00 = 0.88mV/μs

01 = 1.75mV/μs

10 = 3.5mV/μs

11 = 7mV/μs

Step-Down Switching

Regulator 2 Dynamic

Reference Slew Rate:

00 = 0.88mV/μs

01 = 1.75mV/μs

10 = 3.5mV/μs

11 = 7mV/μs

Step-Down Switching

Regulator 1 Dynamic

Reference Slew Rate:

00 = 0.88mV/μs

01 = 1.75mV/μs

10 = 3.5mV/μs

11 = 7mV/μs

1111 1111

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