1-1-3 DC/DC Converter ICs
SI-8000W Series Surface-Mount, Separate Excitation Step-down Switching Mode
■Features
■Absolute Maximum Ratings
• Surface-mount package (SOP8)
Parameter
Symbol
Ratings
Unit
V
DC Input Voltage
VIN
35
• Output current: 0.6A
Power Dissipation
PD
1
W
• High efficiency: 75 to 80%
• Requires only 4 discrete components
Junction Temperature
Tj
–30 to +125
–40 to +125
22
°C
Storage Temperature
Tstg
θj-L
°C
Thermal Resistance (Junction to 7-Pin Lead)
°C/W
°C/W
• Internally-adjusted phase correction and
*1
Thermal Resistance (Junction to Ambient Air)
θj-a
100
output voltage adjustment performed internally
*1: Glass-epoxy board of 40 × 40mm (copper laminate area 4.3%)
• Built-in reference oscillator (60kHz)
• Built-in overcurrent and thermal protection
circuits
■Applications
• Power supplies for telecommunication equipment
• Onboard local power supplies
■Recommended Operating Conditions
Ratings
Parameter
Symbol
Unit
SI-8033W
5.3 to 28
SI-8050W
7 to 33
DC Input Voltage Range
VIN
IO
V
A
Output Current Range
0 to 0.6
Operating Junction Temperature Range
Tjop
–30 to +125
°C
■Electrical Characteristics
(Ta=25°C)
Ratings
Parameter
Symbol
SI-8033W
SI-8050W
Unit
min.
3.17
typ.
max.
3.43
min.
4.80
typ.
max.
5.20
VO
3.30
5.00
V
Output Voltage
Conditions
η
VIN=15V, IO=0.3A
VIN=20V, IO=0.3A
75
80
%
Efficiency
Conditions
f
VIN=15V, IO=0.3A
VIN=20V, IO=0.3A
60
VIN=15V, IO=0.3A
60
60
kHZ
mV
mV
Oscillation Frequency
Line Regulation
Conditions
∆VOLINE
Conditions
∆VOLOAD
Conditions
∆VO/∆Ta
RREJ
VIN=20V, IO=0.3A
80
30
80
100
40
VIN=8 to 28V, IO=0.3A
VIN=10 to 30V, IO=0.3A
20
VIN=15V, IO=0.1 to 0.4A
±0.5
30
VIN=20V, IO=0.1 to 0.4A
±0.5
Load Regulation
Temperature Coefficient of Output Voltage
mV/°C
45
45
dB
Ripple Rejection
Conditions
IS1
f=100 to 120HZ
f=100 to 120HZ
Overcurrent Protection Starting
Current
0.61
0.61
A
Conditions
VIN=15V
VIN=20V
ICs
14
ETC [ ETC ]
