1-1-3 DC/DC Converter ICs
SI-8400L/8500L Series
Separate Excitation Switching Mode with Coil
■Features
■Lineup
• Switching ICs/Coil combined type
• Requires only 2 discrete components
• Low switching noise
Part Number
SI-8401L
5.0
SI-8501L
5.0
VO(V)
IO(A)
0.5
1.0
• No heatsink required
• Built-in overcurrent and thermal protection
circuits
■Absolute Maximum Ratings
Ratings
35
• Built-in soft start circuit (Output ON/OFF
available)...SI-8500L Series
Parameter
Symbol
Unit
SI-8400L
1.25
SI-8500L
DC Input Voltage
VIN
PD
Tj
V
Power Dissipation
3
W
°C
°C
Junction Temperature
Storage Temperature
+100
■Applications
Tstg
–25 to +85
• Telephone power supplies
• Onboard local power supplies
■Recommended Operating Conditions
Ratings
SI-8401L
7 to 33
Parameter
Symbol
Unit
DC Input Voltage Range
VIN
IO
V
A
Output Current Range
0 to 0.5
Operating Temperature Range
Top
–20 to +85
°C
Ratings
SI-8501L
7 to 33
Parameter
Symbol
Unit
DC Input Voltage Range
Output Current Range
VIN
IO
V
A
0 to 1.0
Operating Temperature Range
Top
–20 to +85
°C
■Electrical Characteristics
(Ta=25°C)
Ratings
SI-8401L
typ.
Parameter
Symbol
Unit
min.
4.80
max.
5.20
VO
5.00
Output Voltage
V
Conditions
η
V
V
V
IN=20V,
I
O
O
O
=0.3A
=0.3A
=0.3A
80
Efficiency
%
Conditions
f
IN=20V,
I
I
60
Oscillation Frequency
Line Regulation
kHZ
mV
Conditions
∆VOLINE
Conditions
∆VOLOAD
Conditions
∆VO/∆Ta
∆Vr
IN=20V,
80
100
40
V
IN=10 to 30V,
30
IO=0.3A
Load Regulation
mV
V
IN=20V, IO=0.1 to 0.4A
Temperature Coefficient of Output Voltage
±0.5
mV/°C
Switching Ripple
20
40
mVp-p
A
Voltage (C2=470µF)
Conditions
IS1
VIN=20V, IO=0.3A
Overcurrent Protection
Starting Current
0.55
Conditions
VIN=10V
(Ta=25°C)
Ratings
SI-8501L
typ.
Parameter
Symbol
Unit
min.
4.80
max.
5.20
VO
5.00
Output Voltage
Efficiency
V
Conditions
η
V
V
V
IN=20V,
I
I
O
O
O
=0.5A
=0.5A
=0.5A
83
%
Conditions
f
IN=20V,
60
Oscillation Frequency
Line Regulation
kHZ
mV
Conditions
∆VOLINE
Conditions
∆VOLOAD
Conditions
∆VO/∆Ta
∆Vr
IN=20V,
I
70
130
55
V
IN=10 to 30V,
30
IO=0.5A
Load Regulation
mV
V
IN=20V, IO=0.2 to 0.8A
Temperature Coefficient of Output Voltage
±0.5
mV/°C
Switching Ripple
45
mVp-p
A
Voltage (C2=470µF)
Conditions
IS1
VIN=20V, IO=0.5A
Overcurrent Protection
Starting Current
1.1
Conditions
VIN=18V
ICs
54
ETC [ ETC ]
