Datasheet

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TPS40222
SLUS642A – OCTOBER 2005 – REVISED JANUARY 2006
APPLICATION INFORMATION (continued)
Table 2. Capacitor Selection
(1)
INDUCTOR C
MIN
( µ F)
5-V
IN
RIPPLE f
C
(kHz) f
C
(kHz) f
C
(kHz) C
LEAD
VALUE (PM > 50 ° at
CURRENT (mA) T
J
= -40 ° C T
J
= 25 ° C T
J
= 125 ° C VALUE (pF)
( µ H) -40 ° C)
OUTPUT VOLTAGE V
OUT
= 3.3 V
1.8 Not Recommended
(2)
9 125 101 68 omitted
2.2 340
21 285 247 92 270
12 98 77 52 omitted
3.3 230
28 144 112 67 330
15 80 62 41 omitted
4.7 160
38 111 85 52 470
16 74 58 38 omitted
5.6 140
40 103 79 47 470
OUTPUT VOLTAGE V
OUT
= 2.5 V
13 116 93 63 omitted
1.8 550
23 169 133 81 330
15 102 81 54 omitted
2.2 370
26 147 114 65 330
17 91 71 48 omitted
3.3 300
28 134 102 56 270
20 78 61 41 omitted
4.7 210
38 106 81 47 470
23 68 53 35 omitted
5.6 180
34 106 79 43 330
OUTPUT VOLTAGE V
OUT
= 1.8 V
20 105 84 56 omitted
1.8 580
30 137 109 68 470
21 100 80 54 omitted
2.2 470
32 129 101 62 470
25 86 67 45 omitted
3.3 320
35 115 88 53 470
30 72 56 37 omitted
4.7 220
39 99 75 44 470
33 65 51 34 omitted
5.6 190
40 94 71 41 470
OUTPUT VOLTAGE V
OUT
= 0.8 V
1.8 470 50 94 75 50
2.2 390 52 91 72 48
3.3 260 60 79 62 42 n/a
4.7 180 70 68 53 36
5.6 150 75 63 49 33
(1) See Figure 10 .
(2) For V
OUT
> 3.3 V use an inductor with a value greater than or equal to 2.2 µ H.
11