LTC3589_1 Datasheet, PDF(37/46 Page) Linear Technology – 8-Output Regulator with Sequencing and I2C

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LTC3589_1 Datasheet, PDF (37/46 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]

0x07 SCR1

Buck-Boost

Mode:

Step-Down Switching

Regulator 3 Mode :

Continuous

1 = Burst

Mode

0 0 = Pulse-Skipping

0 1 = Burst

1 0 = Forced Continuous

0x10 OVEN Software EN_LDO4

Control Mode:

EN_LDO3 EN_LDO2

0 = Enable

with Pin

or OVEN

1 = Enable/

Disable

with OVEN

0x12 SCR2

Mask

PGOOD

Hard

Shutdown:

LDO4

Start-Up:

LDO3

Start-Up:

LDO2

Start-Up:

B[3]

B[2]

Step-Down Switching

Regulator 2 Mode :

0 0 = Pulse-Skipping

0 1 = Burst

1 0 = Forced Continuous

EN4

EN3

Buck-Boost

Start-Up:

Step-Down

Switching

Regulator 3

Start-Up:

B[1]

B[0]

Step-Down Switching

Regulator 1 Mode :

0 0 = Pulse-Skipping

0 1 = Burst

1 0 = Forced Continuous

EN2

EN1

DEFAULT

0000 0000

Step-Down

Switching

Regulator 2

Start-Up:

Step-Down 0000 0000

Switching

Regulator 1

Start-Up:

0x20 VCCR

0 = Allow

PGOOD

Timeout

Hard

Shutdown.

1 = Inhibit

PGOOD

Hard

Shutdown.

LDO2

Reference

Select:

0 = Wait for

Output <

300mV Before

Enable

1 = Donât Wait

and Disable

Discharge

Resistor.

Start LDO2

Slew:

0 = Wait

for Output for Output

< 300mV < 300mV

Before Enable Before

Enable

1 = Donât Wait

and Disable 1 = Donât

Discharge Wait and

Resistor. Disable

Discharge

Resistor.

Step-Down

Switching

Regulator 3

Reference

Select:

Start

Step-Down

Switching

Regulator 3

Slew:

0 = Wait

for Output for Output for Output for output

< 300mV

Before Enable Before Enable Before Enable Before Enable

1 = Donât Wait 1 = Donât Wait 1 = Donât Wait 1 = Donât

and Disable and Disable and Disable Wait and

Discharge Discharge Discharge Disable

Resistor.

Discharge

Resistor.

Step-Down

Switching

Regulator 2

Reference

Select:

Start

Step-Down

Switching

Regulator 2

Slew:

Step-Down

Switching

Regulator 1

Reference

Select:

Start

Step-Down

Switching

Regulator 1

Slew:

0000 0000

0 = Went

L2DTV1[4-0]

1 = GO

L2DTV2[4-0]

0x21 CLIRQ

0x23 B1DTV1 Step-Down Switching

Regulator Switch DV/DT

Control:

00 = 1ns

01 = 2ns

10 = 4ns

11 = 8ns

0 = Went

B3DTV1[4-0]

1= GO

B3DTV2[4-0]2

B2DTV1[4-0]

B2DTV2[4-0]

0 = Went

1= GO

0 = Went

B1DTV1[4-0]

1= GO

B1DTV2[4-0]2

PGOOD

Mask:

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

0 = PGOOD

Low When

Slewing

1 = PGOOD

Not Forced

Low When

Slewing.

00000 = 362.5mV

11001 = 675mV

11111 = 750mV

12.5mV Step Size

0001 1001

3589fb

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