Datasheet
LTC3589/LTC3589-1/
LTC3589-2
39
3589ff
For more information www.linear.com/3589
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
0x12
LTC3589-2
SCR2 Mask PGOOD
Hard
Shutdown:
0 = Inhibit
PGOOD
Timeout Hard
Shutdown.
1 = Allow
PGOOD Hard
Shutdown.
LDO4
Start-Up:
0 = Don’t Wait
for Output <
300mV Before
Enable
1 = Wait for
Output < 300mV
Before Enable
LDO4
Start-Up:
0 = Don’t Wait
for Output <
300mV Before
Enable
1 = Wait for
Output <
300mV Before
Enable
LDO4
Start-Up:
0 = Don’t Wait
for Output <
300mV Before
Enable
1 = Wait for
Output <
300mV Before
Enable
LDO4
Start-Up:
0 = Don’t Wait
for Output <
300mV Before
Enable
1 = Wait for
Output <
300mV Before
Enable
LDO4
Start-Up:
0 = Don’t Wait
for Output <
300mV Before
Enable
1 = Wait for
Output <
300mV Before
Enable
LDO4
Start-Up:
0 = Don’t Wait
for Output <
300mV Before
Enable
1 = Wait for
Output <
300mV Before
Enable
LDO4
Start-Up:
0 = Don’t Wait
for Output
< 300mV
Before Enable
1 = Wait
for Output
< 300mV
Before Enable
0000 0000
0x20 VCCR LDO2
Reference
Select:
0 =
L2DTV1[4-0]
1 =
L2DTV2[4-0]
Start LDO2
Slew:
0 = Went
1 = GO
Step-Down
Switching
Regulator 3
Reference
Select:
0 =
B3DTV1[4-0]
1 =
B3DTV2[4-0]2
Start
Step-Down
Switching
Regulator 3
Slew:
0 = Went
1= GO
Step-Down
Switching
Regulator 2
Reference
Select:
0 =
B2DTV1[4-0]
1 =
B2DTV2[4-0]
Start
Step-Down
Switching
Regulator 2
Slew:
0 = Went
1= GO
Step-Down
Switching
Regulator 1
Reference
Select:
0 =
B1DTV1[4-0]
1 =
B1DTV2[4-0]2
Start
Step-Down
Switching
Regulator 1
Slew:
0 = Went
1= GO
0000 0000
0x21 CLIRQ
0x23 B1DTV1 Step-Down Switching
Regulator Switch DV/DT
Control:
00 = 1ns
01 = 2ns
10 = 4ns
11 = 8ns
PGOOD
Mask:
0 = PGOOD
Low When
Slewing
1 = PGOOD
Not Forced
Low When
Slewing.
Step-Down Switching Regulator 1 Feedback Reference Input (V1)
00000 = 362.5mV
11001 = 675mV
11111 = 750mV
12.5mV Step Size
0001 1001
0x24 B1DTV2 Keep-Alive
Mode:
0 = Normal
Shutdown
1 = Keep-Alive
Phase
Select:
0 = Clock
Phase 1
1 = Clock
Phase 2
Step-Down
Switching
Regulator 1
Clock Rate
0 = 2.25MHz
1 = 1.12MHz
Step-Down Switching Regulator 1 Feedback Reference Input (V2)
00000 = 362.5mV
11001 = 675mV
11111 = 750mV
12.5mV Step Size
0001 1001
0x25 VRRCR LDO2 Dynamic Reference
Slew Rate:
00 = 0.88mV/µs
01 = 1.75mV/µs
10 = 3.5mV/µs
11 = 7mV/µs
Step-Down Switching
Regulator 3 Dynamic
Reference Slew Rate:
00 = 0.88mV/µs
01 = 1.75mV/µs
10 = 3.5mV/µs
11 = 7mV/µs
Step-Down Switching
Regulator 2 Dynamic
Reference Slew Rate:
00 = 0.88mV/µs
01 = 1.75mV/µs
10 = 3.5mV/µs
11 = 7mV/µs
Step-Down Switching
Regulator 1 Dynamic
Reference Slew Rate:
00 = 0.88mV/µs
01 = 1.75mV/µs
10 = 3.5mV/µs
11 = 7mV/µs
1111 1111