ISL8225M
TABLE 1. ISL8225M DESIGN GUIDE MATRIX (REFER TO FIGURE 18)
CIN1
(BULK)
(NOTE 10)
EN/FF (kΩ)
R5/R6
(NOTE 11)
LOAD
(A)
(NOTE 12)
V
V
R2 or R4
CIN2
(CERAMIC)
COUT1
(CERAMIC)
COUT2
(BULK)
CFF
(nF)
FREQ.
(kHz)
R
SYNC
IN OUT
CASE (V) (V)
(Ω)
(kΩ)
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
249
1
2
3
4
5
6
7
8
9
5
5
1
1
1.5k
1.5k
1.5k
1.5k
1.0k
1.0k
1.0k
1.0k
1.0k
1.0k
665
665
665
665
665
665
316
316
316
316
316
316
221
221
221
221
221
221
137
137
137
137
1x330µF
1x330µF
1x330µF
1x330µF
1x330µF
1x330µF
1x330µF
1x330µF
1x330µF
1x330µF
1x330µF
1x330µF
1x330µF
1x330µF
1x330µF
1x330µF
1x330µF
1x330µF
1x330µF
1x330µF
1x330µF
1x330µF
1x330µF
1x330µF
1x330µF
1x330µF
1x330µF
1x330µF
1x330µF
1x330µF
1x330µF
1x330µF
1x100µF
1x100µF
2x22µF
2x22µF
1x100µF
1x100µF
2x22µF
2x22µF
2x22µF
2x22µF
1x100µF
1x100µF
2x22µF
2x22µF
2x22µF
2x22µF
1x100µF
1x100µF
2x22µF
2x22µF
2x22µF
2x22µF
1x100µF
1x100µF
2x22µF
2x22µF
2x22µF
2x22µF
2x22µF
2x22µF
2x22µF
2x22µF
1x100µF
3x100µF
1x100µF
3x100µF
1x100µF
3x100µF
1x100µF
3x100µF
1x100µF
3x100µF
1x100µF
3x100µF
1x100µF
3x100µF
1x100µF
3x100µF
1x100µF
3x100µF
1x100µF
3x100µF
1x100µF
3x100µF
1x100µF
3x100µF
1x100µF
3x100µF
1x100µF
3x100µF
1x100µF
3x100µF
1x100µF
3x100µF
1x330µF
None
None
3.3
6.04/3.01
6.04/3.01
6.04/1.50
6.04/1.50
6.04/3.01
6.04/3.01
6.04/1.50
6.04/1.50
6.04/1.50
6.04/1.50
6.04/3.01
6.04/3.01
6.04/1.50
6.04/1.50
6.04/1.50
6.04/1.50
6.04/3.01
6.04/3.01
6.04/1.50
6.04/1.50
6.04/1.50
6.04/1.50
6.04/3.01
6.04/3.01
6.04/1.50
6.04/1.50
6.04/1.50
6.04/1.50
6.04/1.50
6.04/1.50
6.04/1.50
6.04/1.50
500
500
500
500
500
500
500
500
500
500
500
500
500
500
500
500
500
500
650
650
750
750
500
500
800
800
850
850
950
950
950
950
15
15
15
15
15
15
15
15
15
15
15
15
15
15
15
15
15
15
15
15
14
14
15
15
14
14
13
13
12
12
10
10
12
12
5
1
1x330µF
None
None
3.3
1
1.2
1.2
1x330µF
None
None
3.3
5
12 1.2
12 1.2
20 1.2
1x330µF
None
None
3.3
1x330µF
None
3.3
10 20 1.2
4.7
11
12
5
5
1.5
1.5
1x330µF
None
None
3.3
13 12 1.5
14 12 1.5
15 20 1.5
16 20 1.5
1x330µF
None
None
3.3
1x330µF
None
None
3.3
17
18
5
5
2.5
2.5
1x330µF
None
None
3.3
19 12 2.5
20 12 2.5
21 20 2.5
22 20 2.5
1x330µF
None
None
3.3
249
1x330µF
None
None
3.3
147
147
23
24
5
5
3.3
3.3
1x330µF
None
None
None
None
None
None
3.3
None
None
124
25 12 3.3
26 12 3.3
27 20 3.3
28 20 3.3
1x330µF
None
124
1x330µF
None
107
107
29 12
30 12
31 20
32 20
5
5
5
5
1x330µF
None
None
None
None
3.3
82.5
82.5
82.5
82.5
1x330µF
None
NOTES:
10. CIN bulk capacitor is optional only for decoupling noise due to the long input cable. CIN2 and COUT1 ceramic capacitors are listed for one phase only.
Please double the capacitor quantity for dual-phase operations.
11. EN/FF resistor divider is tied directly to VIN. The resistors listed here are for two channels' EN/FF pins tied together. If the separate resistor divider is
used for each channel, the resistor value needs to be doubled.
12. MAX load current listed in the table is for conditions at +25°C and no air flow on a typical Intersil 4-layer evaluation board.
FN7822.1
January 31, 2013
17
INTERSIL [ Intersil ]
