LTC3589 View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'LTC3589' PDF : 46 Pages View PDF
OPERATION
Table 17. LTC3589 Command Register Table
REG
NAME B[7]
B[6]
B[5]
0x12
SCR2 Mask PGOOD LDO4
LTC3589-2
Hard
Start-Up:
Shutdown:
LDO3
Start-Up:
B[4]
LDO2
Start-Up:
LTC3589/LTC3589-1/
LTC3589-2
B[3]
Buck-Boost
Start-Up:
B[2]
Step-Down
Switching
Regulator 3
Start-Up:
B[1]
Step-Down
Switching
Regulator 2
Start-Up:
B[0]
Step-Down
Switching
Regulator 1
Start-Up:
DEFAULT
0000 0000
0 = Inhibit 0 = Don’t Wait
PGOOD
for Output <
Timeout Hard 300mV Before
Shutdown. Enable
0 = Don’t Wait 0 = Don’t Wait 0 = Don’t Wait 0 = Don’t Wait 0 = Don’t Wait
for Output < for Output < for Output for Output < for Output <
300mV Before 300mV Before < 300mV 300mV Before 300mV Before
Enable
Enable
Before Enable Enable
Enable
0 = Don’t Wait
for Output <
300mV Before
Enable
1 = Allow
PGOOD Hard
Shutdown.
1 = Wait for 1 = Wait for 1 = Wait for 1 = Wait 1 = Wait for 1 = Wait for
Output < 300mV Output <
Output <
for Output Output <
Output <
Before Enable 300mV Before 300mV Before < 300mV 300mV Before 300mV Before
Enable
Enable
Before Enable Enable
Enable
1 = Wait for
Output <
300mV Before
Enable
0x20
VCCR LDO2
Start LDO2 Step-Down Start
Step-Down Start
Step-Down Start
0000 0000
Reference Slew:
Switching Step-Down Switching Step-Down Switching
Step-Down
Select:
Regulator 3 Switching Regulator 2 Switching Regulator 1 Switching
Reference Regulator 3 Reference Regulator 2 Reference
Regulator 1
Select:
Slew:
Select:
Slew:
Select:
Slew:
0=
L2DTV1[4-0]
1=
L2DTV2[4-0]
0 = Went
1 = GO
0=
B3DTV1[4-0]
1=
B3DTV2[4-0]
0 = Went
1= GO
0=
0 = Went
B2DTV1[4-0]
1= GO
1=
B2DTV2[4-0]
0=
B1DTV1[4-0]
1=
B1DTV2[4-0]
0 = Went
1= GO
0x21
CLIRQ
0x23
B1DTV1 Step-Down Switching
PGOOD Mask: Step-Down Switching Regulator 1 Feedback Reference Input (V1)
Regulator Switch DV/DT
Control:
0 = PGOOD
Low When 00000 = 362.5mV
00 = 1ns
Slewing
11001 = 675mV
01 = 2ns
11111 = 750mV
10 = 4ns
1 = PGOOD 12.5mV Step Size
11 = 8ns
Not Forced
Low When
Slewing.
0001 1001
0x24
B1DTV2 Keep-Alive Phase
Step-Down Step-Down Switching Regulator 1 Feedback Reference Input (V2)
Mode:
Select:
Switching 00000 = 362.5mV
0 = Normal 0 = Clock
Shutdown Phase 1
1 = Keep-Alive 1 = Clock
Regulator 1 11001 = 675mV
Clock Rate 11111 = 750mV
0 = 2.25MHz 12.5mV Step Size
Phase 2
1 = 1.12MHz
0001 1001
0x25
VRRCR LDO2 Dynamic Reference Step-Down Switching
Step-Down Switching
Step-Down Switching
Slew Rate:
Regulator 3 Dynamic
Regulator 2 Dynamic
Regulator 1 Dynamic
Reference Slew Rate:
Reference Slew Rate:
Reference Slew Rate:
1111 1111
00 = 0.88mV/µs
01 = 1.75mV/µs
10 = 3.5mV/µs
11 = 7mV/µs
00 = 0.88mV/µs
01 = 1.75mV/µs
10 = 3.5mV/µs
11 = 7mV/µs
00 = 0.88mV/µs
01 = 1.75mV/µs
10 = 3.5mV/µs
11 = 7mV/µs
00 = 0.88mV/µs
01 = 1.75mV/µs
10 = 3.5mV/µs
11 = 7mV/µs
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