1-1-3 DC/DC Converter ICs
SI-8000JD Series
Surface-Mount, Separate Excitation Step-down Switching Mode
■Features
■Lineup
• Surface-mount package (TO263-5)
Part Number
SI-8033JD
SI-8050JD
SI-8090JD
SI-8120JD
VO(V)
3.3
5.0
9.0
12.0
• Output current: 1.5A
IO(A)
• High efficiency: 77 to 88%
• Requires only 4 discrete components
1.5
■Absolute Maximum Ratings
• Internally-adjusted phase correction and
output voltage
Parameter
Ratings
Unit
VIN
43
V
Output Current
• Capable of downsizing a choke-coil due to IC's
high switching frequency (125 kHz). (Compared with conventional Sanken devices)
Symbol
DC Input Voltage
IO
1.5
A
PD
3
W
°C
Power
Dissipation*
Junction Temperature
+125
Tstg
–40 to +125
θ j-c
3
°C/W
Thermal Resistance (Junction to
Ambient Air)
θ j-a
33.3
°C/W
When mounted on glass-epoxy board 40 × 40 mm (copper
area 100%)
°C
Thermal Resistance (Junction to Case)
• Output ON/OFF available (Circuit current at
output OFF: 200µA max)
Tj
Storage Temperature
• Built-in foldback-overcurrent and thermal
protection circuits
Conditions
When mounted on glass-epoxy board 40 × 40 mm (copper
area 100%)
*: Limited by thermal protection circuit
• Soft start available by ON/OFF pin Conditions
■Applications
• Power supplies for telecommunication equipment
• Onboard local power supplies, etc.
■Recommended Operating Conditions
Ratings
Parameter
Symbol
SI-8050JD
SI-8090JD
5.3 to 40
7 to 40
11 to 40
6.3 to 40
8 to 40
12 to 40
15 to 40
Conditions
14 to 40
VIN2
Unit
SI-8120JD
VIN1
DC Input Voltage Range
SI-8033JD
DC Output Current Range*
IO=0 to 1A
V
IO=0 to 1.5A
IO
0 to 1.5
A
Operating Junction Temperature Range
Tjop
–30 to +125
°C
VIN≥VO+3V
Operating Temperature Range*
Top
–30 to +125
°C
*: Limited by Ta–PD characteristics
■Electrical Characteristics
(Ta=25°C)
Ratings
Parameter
Symbol
SI-8033JD
SI-8050JD
min.
VO
Output Voltage
typ.
max.
min.
3.234
3.30
3.366
4.90
Conditions
Temperature Coefficient of Output Voltage
Overcurrent Protection
Starting Current
IS1
max.
5.00
5.10
8.82
9.00
9.18
11.76
12.00
12.24
VIN=20V, IO=0.5A
VIN=21V, IO=0.5A
82
86
88
VIN=20V, IO=0.5A
VIN=21V, IO=0.5A
VIN=24V, IO=0.5A
125
125
125
VIN=20V, IO=0.5A
VIN=21V, IO=0.5A
V
VIN=24V, IO=0.5A
VIN=24V, IO=0.5A
25
80
40
100
10
10
50
VIN=10 to 30V, IO=0.5A
30
VIN=15V, IO=0.2 to 0.8A
∆VO/∆Ta
Conditions
typ.
VIN=8 to 30V, IO=0.5A
∆VOLOAD
Conditions
min.
VIN=15V, IO=0.5A
∆VOLINE
Load Regulation
max.
125
Conditions
Conditions
typ.
VIN=15V, IO=0.5A
f
Line Regulation
Unit
min.
77
Conditions
Oscillation Frequency
SI-8120JD
max.
VIN=15V, IO=0.5A
η
Efficiency
SI-8090JD
typ.
40
10
VIN=20V, IO=0.2 to 0.8A
±0.5
40
mV/ °C
1.6
VIN=21V
A
VIN=24V
VSSL
0.5
0.5
0.5
0.5
Outflow Current
at Low Voltage
ISSL
100
100
100
100
Conditions
Iq
Quiescent Circuit Current
Conditions
Iq(oFF)
Conditions
7
VIN=15V, Io=0A
7
VIN=20V, Io=0A
200
VIN=15V, VON/OFF=0.3V
mA
VIN=24V, Io=0A
200
200
VIN=21V, VON/OFF=0.3V
VIN=24V, VON/OFF=0.3V
µA
SI-8000JD
SI-8000JD
SI-8000JD
5 ON/OFF
5 ON/OFF
5 ON/OFF
C3
VOUT. ON/OFF
ICs
7
VIN=21V, Io=0A
200
VIN=20V, VON/OFF=0.3V
V
µA
VSSL=0V
7
*: Pin 5 is the ON/OFF pin. Soft start at power on can be performed with a capacitor connected to
this pin.
The output can also be turned ON/OFF with this pin.
The output is stopped by setting the voltage of this pin to VSSL or lower.
ON/OFF-pin voltage can be changed with an open-collector drive circuit of a transistor.
When using both the soft-start and ON/OFF functions together, the discharge current from C3
flows into the ON/OFF control transistor. Therefore, limit the current securely to protect the
transistor if C3 capacitance is large.
The ON/OFF pin is pulled up to the power supply in the IC, so applying the external voltage is
prohibited.
16
mV
VIN=24V, IO=0.2 to 0.8A
Low Level Voltage
ON/OFF*
Pin
mV
40
±1.0
1.6
VIN=20V
130
10
±1.0
1.6
VIN=15V
60
kHZ
VIN=18 to 30V, IO=0.5A
VIN=21V, IO=0.2 to 0.8A
±0.5
1.6
120
VIN=15 to 30V, IO=0.5A
%
Soft Start
C3
Soft Start
+VOUT. ON/OFF
