Datasheet

GND
GND
R
SET
0.05 W
1%
C
O
330 Fm
PTN78020W
7 4
5
62
3
V
I
V
I
V
O
V
O
GND
Inhibit
1
Sense
Adjust
C
2.2 F
Ceramic
I
m
GND
PTN78020W
PTN78020H
www.ti.com SLTS228C – DECEMBER 2004– REVISED AUGUST 2011
(1) A 0.05-W rated resistor may be used. The tolerance should be 1%, with a temperature stability of 100 ppm/°C (or
better). Place the resistor as close to the regulator as possible. Connect the resistor directly between pins 4 and 7
using dedicated PCB traces.
(2) Never connect capacitors from V
O
Adjust to either GND or V
O
. Any capacitance added to the V
O
Adjust
pin affects the stability of the regulator.
Figure 24. PTN78020W V
O
Adjust Resistor Placement
Table 3. PTN78020W Output Voltage Set-Point Resistor Values
V
O
(V) R
SET
(kΩ) V
O
(V) R
SET
(kΩ) V
O
(V) R
SET
(kΩ) V
O
(V) R
SET
(kΩ)
2.50 Open 3.7 V 50.7 6.1 12.6 9.0 4.07
2.55 1370 3.8 V 46 6.2 12.1 9.2 3.75
2.60 680 3.9 V 42.5 6.3 11.6 9.4 3.46
2.65 451 4.0 V 39.3 6.4 11.1 9.6 3.18
2.70 337 4.1 V 36.4 6.5 10.7 9.8 2.91
2.75 268 4.2 V 33.9 6.6 10.2 10.0 2.66
2.80 222 4.3 V 31.6 6.7 9.85 10.2 2.42
2.85 190 4.4 V 29.6 6.8 9.47 10.4 2.20
2.90 165 4.5 V 27.8 6.9 9.11 10.6 1.98
2.95 146 4.6 V 26.2 7.0 8.76 10.8 1.78
3.00 131 4.7 V 24.7 7.1 8.43 11.0 1.58
3.05 118 4.8 V 23.3 7.2 8.11 11.2 1.40
3.10 108 4.9 V 22.1 7.3 7.81 11.4 1.22
3.15 99.1 5.0 V 21.0 7.4 7.52 11.6 1.05
3.20 91.5 5.1 V 19.9 7.5 7.24 11.8 0.889
3.25 85.0 5.2 V 18.9 7.6 6.97 12.0 0.734
3.30 79.3 5.3 V 18.0 7.7 6.71 12.2 0.585
3.35 74.2 5.4 V 17.2 7.8 6.46 12.4 0.442
3.40 69.8 5.5 V 16.4 7.9 6.22 12.6 0.305
3.45 65.7 5.6 V 15.6 8.0 5.99
3.50 62.1 5.7 V 15.0 8.2 5.55
3.55 58.9 5.8 V 14.3 8.4 5.14
3.60 55.9 5.9 V 13.7 8.6 4.76
3.65 53.2 6.0 V 13.1 8.8 4.40
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