ncp3122 ON Semiconductor, ncp3122 Datasheet - Page 15

• Manufacturer Part Number: ncp3122
• Description: Dual 2.0 A, Step-down Dc/dc Switching Regulator
• Manufacturer: ON Semiconductor

Output Rectifier Diode
magnetic field in the inductor. During off time, the internal
MOSFET switch is off. Since the current in the inductor has
to discharge, the current flows through the rectifying diode
to the output. A Schottky diode is recommended due to low
diode forward voltage and very short recovery times, which
positively impacts the step down voltage converter's overall
Table 2. Inductor Examples
When the high-side switch is on, energy is stored in the
[mH]
8.2
6.8
5.6
5.4
5.2
4.7
3.9
3.8
3.3
2.2
33
22
15
10
L
MSS1246T-153
PG0015.223NL
PG0015.153NL
PF0698.333NL
PF0560.333NL
PF0560.223NL
PA0390.472NL
PA0390.332NL
DO1813H-222
DO3316P-333
MSS1038-333
DO3340P-223
MSS1038-223
DO3316P-153
DO3308P-103
MSS6132-822
MSS6132-562
DO3316T-392
DS3316P-103
DS3316P-822
DS3316P-332
LPS4018-332
LPS5030-222
P0762.103NL
Part Number
P1167.103NL
P1167.542NL
744774068
74458133
74456122
74477510
74454068
74453031
74456115
7445404
7445403
7445302
7445402
Non-shielded
Shielded/
N
S
N
N
S
N
S
N
N
S
N
S
N
N
S
N
N
N
S
S
S
N
S
S
S
N
S
N
N
S
S
S
S
S
S
S
N
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2.85
1.95
2.27
2.65
2.95
2.76
2.15
I
[A]
2.1
2.3
3.0
2.8
2.2
2.5
2.6
2.5
3.1
3.4
2.9
2.3
2.3
2.1
2.4
2.2
2.5
2.2
2.7
5.3
2.9
2.9
2.2
3.3
3.8
3.1
NCP3122
rms
2
2
2
2
15
efficiency. Another choice could be fast recovery or
ultra-fast recovery diodes. It should be noted that some
types of these diodes with an abrupt turn-off characteristic
may cause instability or EMI troubles.
DCR max
[mW}
54.4
42.8
100
100
101
110
93
66
65
93
66
73
95
73
46
56
60
80
85
70
50
85
70
82
55
60
33
40
15
30
62
80
39
45
27
57
35
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