LTC3589 datasheet(38/50 Pages) LINER

38 / 50 page

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

0x07

SCR1

Buck-Boost

Mode:

0 = Continuous

1 = Burst Mode

Step-Down Switching

Regulator 3 Mode :

0 0 = Pulse-Skipping

0 1 = Burst

1 0 = Forced Continuous

Step-Down Switching

Regulator 2 Mode :

0 0 = Pulse-Skipping

0 1 = Burst

1 0 = Forced Continuous

Step-Down Switching

Regulator 1 Mode :

0 0 = Pulse-Skipping

0 1 = Burst

1 0 = Forced Continuous

0000 0000

0x10

OVEN

Software

Control Mode:

0 = Enable

with Pin or

OVEN Register

1 = Enable/

Disable with

OVEN Register

Only

EN_LDO4

EN_LDO3

EN_LDO2

EN4

EN3

EN2

EN1

0000 0000

0x12

LTC3589

SCR2

Mask PGOOD

Hard

Shutdown:

0 = Allow

PGOOD

Timeout Hard

Shutdown.

1 = Inhibit

PGOOD Hard

Shutdown.

LDO4

Start-Up:

0 = Wait for

Output < 300mV

Before Enable

1 = Don’t Wait

and Disable

Discharge

Resistor.

LDO3

Start-Up:

0 = Wait

for Output

< 300mV

Before Enable

1 = Don’t Wait

and Disable

Discharge

Resistor.

LDO2

Start-Up:

0 = Wait for

Output <

300mV Before

Enable

1 = Don’t Wait

and Disable

Discharge

Resistor.

Buck-Boost

Start-Up:

0 = Wait

for Output

< 300mV

Before Enable

1 = Don’t Wait

and Disable

Discharge

Resistor.

Step-Down

Switching

Regulator 3

Start-Up:

0 = Wait

for Output

< 300mV

Before Enable

1 = Don’t Wait

and Disable

Discharge

Resistor.

Step-Down

Switching

Regulator 2

Start-Up:

0 = Wait

for Output

< 300mV Before

Enable

1 = Don’t Wait

and Disable

Discharge

Resistor.

Step-Down

Switching

Regulator 1

Start-Up:

0 = Wait

for Output

< 300mV

Before Enable

1 = Don’t Wait

and Disable

Discharge

Resistor.

0000 0000

0x12

LTC3589-1

SCR2

Mask PGOOD

Hard

Shutdown:

0 = Inhibit

PGOOD

Timeout Hard

Shutdown.

1 = Allow

PGOOD Hard

Shutdown.

LDO4

Start-Up:

0 = Wait for

Output < 300mV

Before Enable

1 = Don’t Wait

and Disable

Discharge

Resistor.

LDO3

Start-Up:

0 = Wait

for Output

< 300mV

Before Enable

1 = Don’t Wait

and Disable

Discharge

Resistor.

LDO2

Start-Up:

0 = Wait for

Output <

300mV Before

Enable

1 = Don’t Wait

and Disable

Discharge

Resistor.

Buck-Boost

Start-Up:

0 = Wait

for Output

< 300mV

Before Enable

1 = Don’t Wait

and Disable

Discharge

Resistor.

Step-Down

Switching

Regulator 3

Start-Up:

0 = Wait

for Output

< 300mV

Before Enable

1 = Don’t Wait

and Disable

Discharge

Resistor.

Step-Down

Switching

Regulator 2

Start-Up:

0 = Wait

for Output

< 300mV Before

Enable

1 = Don’t Wait

and Disable

Discharge

Resistor.

Step-Down

Switching

Regulator 1

Start-Up:

0 = Wait

for Output

< 300mV

Before Enable

1 = Don’t Wait

and Disable

Discharge

Resistor.

0000 0000

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