LTC3589_12 Datasheet, PDF (38/50 Pages) Linear Technology – 8-Output Regulator with Sequencing and I2C

LTC3589/LTC3589-1/
LTC3589-2
OPERATION
Table 17. 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 :
0 = Continuous 0 0 = Pulse-Skipping
1 = Burst Mode 0 1 = Burst
1 0 = Forced Continuous
0x10
OVEN Software EN_LDO4
EN_LDO3 EN_LDO2
Control Mode:
0 = Enable
with Pin or
OVEN Register
1 = Enable/
Disable with
OVEN Register
Only
0x12
SCR2 Mask PGOOD LDO4
LTC3589
Hard
Start-Up:
Shutdown:
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
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
0000 0000
Buck-Boost
Start-Up:
Step-Down
Switching
Regulator 3
Start-Up:
Step-Down
Switching
Regulator 2
Start-Up:
Step-Down
Switching
Regulator 1
Start-Up:
0000 0000
0 = Allow 0 = Wait for 0 = Wait
0 = Wait for 0 = Wait
0 = Wait
0 = Wait
0 = Wait
PGOOD
Output < 300mV for Output Output < for Output for Output for Output for Output
Timeout Hard Before Enable < 300mV 300mV Before < 300mV < 300mV < 300mV Before < 300mV
Shutdown.
Before Enable Enable
Before Enable Before Enable Enable
Before Enable
0x12
SCR2
LTC3589-1
1 = Inhibit 1 = Don’t Wait
PGOOD Hard and Disable
Shutdown. Discharge
Resistor.
Mask PGOOD LDO4
Hard
Start-Up:
Shutdown:
1 = Don’t Wait 1 = Don’t Wait 1 = Don’t Wait 1 = Don’t Wait 1 = Don’t Wait
and Disable and Disable and Disable and Disable and Disable
Discharge Discharge Discharge Discharge Discharge
Resistor. Resistor. Resistor. Resistor. Resistor.
LDO3
Start-Up:
LDO2
Start-Up:
Buck-Boost
Start-Up:
Step-Down
Switching
Regulator 3
Start-Up:
Step-Down
Switching
Regulator 2
Start-Up:
1 = Don’t Wait
and Disable
Discharge
Resistor.
Step-Down
Switching
Regulator 1
Start-Up:
0000 0000
0 = Inhibit 0 = Wait for 0 = Wait
0 = Wait for 0 = Wait
0 = Wait
0 = Wait
0 = Wait
PGOOD
Output < 300mV for Output Output < for Output for Output for Output for Output
Timeout Hard Before Enable < 300mV 300mV Before < 300mV < 300mV < 300mV Before < 300mV
Shutdown.
Before Enable Enable
Before Enable Before Enable Enable
Before Enable
1 = Allow 1 = Don’t Wait
PGOOD Hard and Disable
Shutdown. Discharge
Resistor.
1 = Don’t Wait 1 = Don’t Wait 1 = Don’t Wait 1 = Don’t Wait 1 = Don’t Wait
and Disable and Disable and Disable and Disable and Disable
Discharge Discharge Discharge Discharge Discharge
Resistor. Resistor. Resistor. Resistor. Resistor.
1 = Don’t Wait
and Disable
Discharge
Resistor.
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