LTC3589-1 datasheet(29/38 Pages) LINER

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LTC3676/LTC3676-1

3676ff

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operaTion

REG NAME

B[7]

B[6]

B[5]

B[4]

B[3]

B[2]

B[1]

B[0]

DEFAULT

0x01 BUCK1 Enable:

0 = Disabled if

EN_B1 Low

1 = Enabled

Mode:

00 = Pulse-Skipping

01 = Burst

10 = Forced Continuous

Start-Up:

0 = Enable at

Any Output

Voltage

1 = Enable

Only if Output

<300mV

Phase Select:

0 = Clock

Phase 1

1 = Clock

Phase 2

Clock Rate:

0 = 2.25MHz

1 = 1.125MHz

Keep Alive

Buck1:

0 = Do Not

Keep Alive

1= Keep Alive in

Shutdown.

Switch DV/DT

Control:

0 = Slow

1 = Fast

0000 0000

0x02 BUCK2 Enable:

0 = Disabled if

EN_B2 Low

1 = Enabled

Mode:

00 = Pulse-Skipping

01 = Burst

10 = Forced Continuous

Start-Up:

0 = Enable at

Any Output

Voltage

1 = Enable

Only if Output

<300mV

Phase Select:

0 = Clock

Phase 1

1 = Clock

Phase 2

Clock Rate:

0 = 2.25MHz

1 = 1.125MHz

Keep Alive

Buck2:

0 = Do Not

Keep Alive

1 = Keep Alive

in Shutdown

Switch DV/DT

Control:

0 = Slow

1 = Fast

0000 0000

0x03 BUCK3 Enable:

0 = Disabled if

EN_B3 Low

1 = Enabled

Mode:

00 = Pulse-Skipping

01 = Burst

10 = Forced Continuous

Start-Up:

0 = Enable at

Any Output

Voltage

1 = Enable

Only if Output

<300mV

Phase Select:

0 = Clock

Phase 1

1 = Clock

Phase 2

Clock Rate:

0 = 2.25MHz

1 = 1.125MHz

Keep Alive

Buck3:

0 = Do Not

Keep Alive

1 = Keep Alive

in Shutdown

Switch DV/DT

Control:

0 = Slow

1 = Fast

0000 0000

0x04 BUCK4 Enable:

0 = Disabled if

EN_B4 Low

1 = Enabled

Mode:

00 = Pulse-Skipping

01 = Burst

10 = Forced Continuous

Start-Up:

0 = Enable at

Any Output

Voltage

1 = Enable

Only if Output

<300mV

Phase Select:

0 = Clock

Phase 1

1 = Clock

Phase 2

Clock Rate:

0 = 2.25MHz

1 = 1.125MHz

Keep Alive

Buck4:

0 = Do Not

Keep Alive

1 = Keep Alive

in Shutdown

Switch DV/DT

Control:

0 = Slow

1 = Fast

0000 0000

0x05 LDOA

Reserved

Enable LDO3:

0 = Disabled if

EN_L3 Low

1 = Enabled

Start-Up LDO3:

0 = Enable at

Any Output

Voltage

1 = Enable

Only if Output

<300mV

Keep Alive

LDO3:

0 = Do Not

Keep Alive

1 = Keep Alive

in Shutdown.

Enable LDO2:

0 = Disabled if

EN_L2 Low

1 = Enabled

Start-Up LDO2:

0 = Enable at

Any Output

Voltage

1 = Enable

Only if Output

<300mV

Keep Alive

LDO2:

0 = Do Not

Keep Alive

1 = Keep Alive

in Shutdown

XX00 0000

0x06 LDOB

Reserved

LTC3676-1 LDO4 Output

Voltage:

00 = 1.2V

01 = 2.5V

10 = 2.8V

11 = 3.0V

Enable LDO4:

0 = Disabled if

EN_L4 Low

1 = Enabled

Start-Up LDO4:

0 = Enable at

Any Output

Voltage

1 = Enable

Only if Output

<300mV

Keep Alive

LDO4:

0 = Do Not

Keep Alive

1 = Keep Alive

in Shutdown

XX00 0000

0x07 SQD1

Sequence Down Buck4:

00 = With WAKE

01 = WAKE + 100ms

10 = WAKE + 200ms

11 = WAKE + 300ms

Sequence Down Buck3:

00 = With WAKE

01 = WAKE + 100ms

10 = WAKE + 200ms

11 = WAKE + 300ms

Sequence Down Buck2:

00 = With WAKE

01 = WAKE + 100ms

10 = WAKE + 200ms

11 = WAKE + 300ms

Sequence Down Buck1:

00 = With WAKE

01 = WAKE + 100ms

10 = WAKE + 200ms

11 = WAKE + 300ms

0000 0000

Table 20. LTC3676 Command Registers

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