PT6937A Datasheet, PDF (10/14 Pages) Texas Instruments – Internal Sequencing Short Circuit Protection 23-pin Space-Saving Package

Application Notes
PT6935 Series
Not Recommended For New Designs
Table 1
ADJUSTMENT RANGE AND FORMULA PARAMETERS
Vo1 Bus
Series Pt #
Adj. Resistor
PT6935/39 PT6936/37/38
(R3)/R4
(R3)/R4
Vo2 Bus (2)
PT6938/39
(R1)/R2
Vo(nom)
Va(min)
Va(max)
Vr
Rs (kΩ)
2.5V
1.8V *
3.6V (4)
1.27V
7.5
3.3V
2.5V *
3.6V
1.27V
15.4
1.2V
1.0V †
1.5V #
0.6125V
20.0
Ref. Note 3:
* (R3) = Zero-ohm link
†(R1) = Zero-ohm link
# (R2) = Zero-ohm link
PT6935/37
(R1)/R2
1.8V
1.5V †
2.4V
1.0V
16.9
PT6936
(R1)/R2
2.5V
1.8V †
3.0
1.0V
11.5
Table 2
ADJUSTMENT RESISTOR VALUES
Vo1 Bus
Series Pt #
PT6935/39 PT6936/37/38
Adj. Resistor (R3)/R4
(R3)/R4
V_o(nom)
Va(req’d)
1.8
1.85
1.9
1.95
2.0
2.05
2.1
2.2
2.3
2.4
2.5
2.6
2.7
2.8
2.9
3.0
3.1
3.2
3.3
3.4
3.5
3.6
2.5V
(0.0)
(1.4)kΩ
(3.0)kΩ
(4.9)kΩ
(7.1)kΩ
(9.8)kΩ
(13.3)kΩ
(23.5)kΩ
(44.0)kΩ
(106.0)kΩ
120.0kΩ
56.0kΩ
34.8kΩ
24.3kΩ
17.9kΩ
13.7kΩ
10.6kΩ
8.4kΩ
6.6kΩ
5.2kΩ
4.1kΩ
3.3V
(0.0)kΩ
(3.6)kΩ
(8.4)kΩ
(15.2)kΩ
(25.4)kΩ
(42.3)kΩ
(76.1)kΩ
(178.0)kΩ
112.0k
48.1k
26.9k
R1/R3 = (Blue), R2/R4 = Black
Vo2 Bus
Series Pt #
Adj. Resistor
V_o(nom)
Va(req’d)
1.0
1.05
1.1
1.15
1.2
1.25
1.3
1.35
1.4
1.45
1.5
1.55
1.6
1.65
1.7
1.75
1.8
1.85
1.9
1.95
2.0
2.05
2.1
2.2
2.3
2.4
2.5
2.6
2.7
2.8
2.9
3.0
PT6938/39
(R1)/R2
1.2V
(0.0)kΩ
(9.2)kΩ
(28.8)kΩ
(87.5)kΩ
101.5kΩ
41.2kΩ
20.8kΩ
10.6kΩ
4.5kΩ
0.0kΩ
PT6935/37
(R1)/R2
1.8V
(0.0)kΩ
(5.1)kΩ
(13.1)kΩ
(26.4)kΩ
(53.1)kΩ
(133.0)kΩ
183.0kΩ
83.1kΩ
49.8kΩ
33.1kΩ
23.1kΩ
16.4kΩ
8.1kΩ
3.1kΩ
0.0kΩ
PT6936
(R1)/R2
2.5V
(0.0)kΩ
(1.6)kΩ
(3.5)kΩ
(5.8)kΩ
(8.5)kΩ
(11.8)kΩ
(16.0)kΩ
(28.5)kΩ
(53.5)kΩ
(129.0)kΩ
88.5kΩ
38.5kΩ
21.8kΩ
13.5kΩ
8.5kΩ
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