Application Note 1793

4

AN1793.1

December 6, 2012

TABLE 3. ISL8225M OPERATION MODES

1ST MODULE (I = INPUT; O = OUTPUT; I/O = INPUT AND OUTPUT, BI-DIRECTION)

MODES OF OPERATION

OUTPUT

(SEE

DESCRIPTION

FOR DETAILS)

OPERATION

MODE

MODULE

OPERATION

MODE

MODULE

MODE

EN1/FF1

(I)

EN2/FF2

(I)

VSEN2-

(I)

MODE

(I)

VSEN2+

(I)

CLKOUT/REFIN

(I OR O)

VMON2

(Note 2)

VMON1

MODULE

(Note 2)

(NOTE 1)

10

0

-

-

-

--

-

-

-

-

Disabled

2A

0

1

Active

Active Active

-

Active

-

VMON1 =

VMON2 to Keep

PGOOD Valid

--

Single Phase

2B

1

0

-

-

-

-

-

-

VMON1 =

VMON2 to Keep

PGOOD Valid

--

Single Phase

3A

1

1

29% to 45%

Active

-

0°

-

-

Dual Regulator

3B

1

1

45% to 62%

Active

-

90°

-

-

Dual Regulator

3C

1

1

-

180°

-

-

Dual Regulator

41

1

-

-60°

-

-

DDR Mode

5A

1

1

GND

-

60°

VMON1

or

Divider

-

180°

-

-

2-Phase

5B

1

1

GND

-

60°

Divider

Divider

180°

5B

5B

6-Phase

5C

1

1

GND

-

60°

VMON1

or

Divider

Active

180°

5C

5C

3 Outputs

61

1

GND

120°

1kΩ

Active

240°

2B

-

3-Phase

7A

1

1

90°

1kΩ

Divider

180°

7A

-

4-Phase

7B

1

1

90°

1kΩ

Active

180°

7B

-

2 Outputs

Mode 7A)

7C

1

1

90°

1kΩ

Active

180°

3, 4

-

3 Outputs

Mode 7A)

8

Cascaded Module Operation MODEs 5B+5B+7A+5B+5B+5B/7A, No External Clock Required

12-Phase

9

External Clock or External Logic Circuits Required for Equal Phase Interval

5, 7, 8, 9, 10, 11,

or

(PHASE >12)

NOTE:

column. For example, 90° means Channel 2 lags Channel 1 by 90°; -60° means Channel 2 leads Channel 1 by 60°.

2. “VMON1” means that the pin is tied to the VMON1 pin of the same module.