1-1-2 Switching Mode Regulator ICs
SI-8400L/8500L Series
Separate Excitation Switching Mode Regulator ICs with Coil
sFeatures
• Switching ICs/Coil combined type
• Requires only 2 discrete components
• Low switching noise
• No heatsink required
• Built-in overcurrent and thermal protection
circuits
• Built-in soft start circuit (Output ON/OFF
available)...SI-8500L Series
sLineup
Part Number
V
O
(V)
I
O
(A)
SI-8401L
5.0
0.5
SI-8402L
12.0
0.4
SI-8403L
3.3
0.5
SI-8501L
5.0
SI-8502L
12.0
1.0
SI-8503L
3.3
SI-8504L
9.0
sAbsolute
Maximum Ratings
Parameter
DC Input Voltage
Power Dissipation
Junction Temperature
Storage Temperature
Symbol
V
IN
P
D
T
j
T
stg
1.25
+100
–25 to +85
Ratings
SI-8400L
35
3
SI-8500L
Unit
V
W
°C
°C
sApplications
• Telephone power supplies
• Onboard local power supplies
sRecommended
Operating Conditions
Parameter
DC Input Voltage Range
Output Current Range
Operating Temperature Range
Symbol
V
IN
I
O
T
op
Ratings
SI-8401L
7 to 33
0 to 0.5
SI-8402L
15 to 33
0 to 0.4
–20 to +85
SI-8403L
5.3 to 33
0 to 0.5
Unit
V
A
°C
Parameter
DC Input Voltage Range
Output Current Range
Operating Temperature Range
Symbol
V
IN
I
O
T
op
Ratings
SI-8501L
7 to 33
SI-8502L
15 to 33
0 to 1.0
–20 to +85
SI-8503L
5.3 to 33
SI-8504L
12 to 33
Unit
V
A
°C
sElectrical
Characteristics
Ratings
Parameter
Symbol
min.
Output Voltage
Efficiency
Oscillation Frequency
Line Regulation
Load Regulation
Temperature Coefficient of Output Voltage
Switching Ripple
Voltage (C
2
=470
µ
F)
Overcurrent Protection
Starting Current
V
O
Conditions
4.80
SI-8401L
typ.
5.00
V
IN
=20V, I
O
=0.3A
80
V
IN
=20V, I
O
=0.3A
60
V
IN
=20V, I
O
=0.3A
80
V
IN
=10 to 30V, I
O
=0.3A
30
V
IN
=20V, I
O
=0.1 to 0.4A
±0.5
20
V
IN
=20V, I
O
=0.3A
0.55
V
IN
=10V
0.45
V
IN
=18V
40
40
100
max.
5.20
min.
11.40
SI-8402L
typ.
12.00
V
IN
=24V, I
O
=0.3A
88
V
IN
=24V, I
O
=0.3A
60
V
IN
=24V, I
O
=0.3A
100
V
IN
=18 to 30V, I
O
=0.3A
70
V
IN
=24V, I
O
=0.1 to 0.4A
±1.5
35
V
IN
=24V, I
O
=0.3A
0.55
V
IN
=8V
70
95
130
max.
12.60
min.
3.17
SI-8403L
typ.
3.30
V
IN
=15V, I
O
=0.3A
75
V
IN
=15V, I
O
=0.3A
60
V
IN
=15V, I
O
=0.3A
60
V
IN
=8 to 30V, I
O
=0.3A
20
V
IN
=15V, I
O
=0.1 to 0.4A
±0.5
15
V
IN
=15V, I
O
=0.3A
30
30
80
max.
3.43
(T
a
=25°C)
Unit
V
%
kH
Z
mV
mV
mV/°C
mV
p-p
A
η
Conditions
f
Conditions
∆V
OLINE
Conditions
∆V
OLOAD
Conditions
∆V
O
/∆T
a
∆V
r
Conditions
I
S1
Conditions
(T
a
=25°C)
Ratings
Parameter
Symbol
min.
Output Voltage
Efficiency
Oscillation Frequency
Line Regulation
Load Regulation
Temperature Coefficient of Output Voltage
Switching Ripple
Voltage (C
2
=470
µ
F)
Overcurrent Protection
Starting Current
V
O
Conditions
4.80
SI-8501L
typ.
5.00
V
IN
=20V, I
O
=0.5A
83
V
IN
=20V, I
O
=0.5A
60
V
IN
=20V, I
O
=0.5A
70
V
IN
=10 to 30V, I
O
=0.5A
30
V
IN
=20V, I
O
=0.2 to 0.8A
±0.5
45
V
IN
=20V, I
O
=0.5A
1.1
V
IN
=18V
1.1
V
IN
=24V
55
130
max.
5.20
min.
11.40
SI-8502L
typ.
12.00
V
IN
=24V, I
O
=0.5A
89
V
IN
=24V, I
O
=0.5A
60
V
IN
=24V, I
O
=0.5A
70
V
IN
=18 to 30V, I
O
=0.5A
30
V
IN
=24V, I
O
=0.2 to 0.8A
±1.5
30
V
IN
=24V, I
O
=0.5A
1.1
V
IN
=12V
55
130
max.
12.60
min.
3.17
SI-8503L
typ.
3.30
V
IN
=15V, I
O
=0.5A
79
V
IN
=15V, I
O
=0.5A
60
V
IN
=15V, I
O
=0.5A
50
V
IN
=8 to 30V, I
O
=0.5A
20
V
IN
=15V, I
O
=0.2 to 0.8A
±0.5
15
V
IN
=15V, I
O
=0.5A
1.1
V
IN
=21V
A
45
80
max.
3.43
min.
8.55
SI-8504L
typ.
9.00
V
IN
=21V, I
O
=0.5A
87
V
IN
=21V, I
O
=0.5A
60
V
IN
=21V, I
O
=0.5A
70
V
IN
=15 to 30V, I
O
=0.5A
30
V
IN
=21V, I
O
=0.2 to 0.8A
±1.0
25
V
IN
=21V, I
O
=0.5A
mV
p-p
55
mV
mV/°C
130
mV
kH
Z
%
max.
9.45
V
Unit
η
Conditions
f
Conditions
∆V
OLINE
Conditions
∆V
OLOAD
Conditions
∆V
O
/∆T
a
∆V
r
Conditions
I
S1
Conditions
80
ICs
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