Datasheet

ManualsBrandsLINEAR TECHNOLOGY ManualsPMICsPMIC - voltage regulator - special purpose QFN 40 (6x6)

LTC3676/LTC3676-1

28

3636fa

For more information www.linear.com/LTC3676

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 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 Reserved 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 21. LTC3676 Command Registers