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
3.3
SI-8050JD
5.0
SI-8090JD
9.0
SI-8120JD
12.0
VO(V)
• Output current: 1.5A
IO(A)
1.5
• High efficiency: 77 to 88%
• Requires only 4 discrete components
■Absolute Maximum Ratings
• Internally-adjusted phase correction and
output voltage
Parameter
Symbol
Ratings
Unit
V
Conditions
DC Input Voltage
VIN
43
• Capable of downsizing a choke-coil due to IC's
high switching frequency (125 kHz). (Com-
pared with conventional Sanken devices)
Output Current
IO
1.5
A
When mounted on glass-epoxy board 40 × 40 mm (copper
area 100%)
Power Dissipation*
PD
3
W
Junction Temperature
Tj
+125
–40 to +125
3
°C
°C
• Built-in foldback-overcurrent and thermal
protection circuits
Storage Temperature
Tstg
θj-c
Thermal Resistance (Junction to Case)
°C/W
• Output ON/OFF available (Circuit current at
Thermal Resistance (Junction to
Ambient Air)
When mounted on glass-epoxy board 40 × 40 mm (copper
area 100%)
θj-a
33.3
°C/W
output OFF: 200µA max)
*: 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
SI-8050JD
Parameter
Symbol
Unit
V
Conditions
SI-8033JD
5.3 to 40
6.3 to 40
SI-8090JD
11 to 40
SI-8120JD
14 to 40
VIN1
VIN2
IO
7 to 40
8 to 40
IO=0 to 1A
IO=0 to 1.5A
VIN≥VO+3V
DC Input Voltage Range
12 to 40
15 to 40
DC Output Current Range*
0 to 1.5
A
Operating Junction Temperature Range
Operating Temperature Range*
Tjop
Top
–30 to +125
–30 to +125
°C
°C
*: Limited by Ta–PD characteristics
■Electrical Characteristics
(Ta=25°C)
Ratings
Parameter
Symbol
SI-8033JD
SI-8050JD
SI-8090JD
SI-8120JD
typ.
Unit
min.
typ.
max.
min.
4.90
typ.
max.
5.10
min.
8.82
typ.
max.
9.18
min.
max.
VO
3.234
3.30
3.366
5.00
9.00
11.76
12.00
12.24
Output Voltage
V
Conditions
η
VIN=15V, IO=0.5A
VIN=20V, IO=0.5A
VIN=21V, IO=0.5A
VIN=24V, IO=0.5A
77
VIN=15V, IO=0.5A
125
82
VIN=20V, IO=0.5A
125
86
VIN=21V, IO=0.5A
125
88
VIN=24V, IO=0.5A
125
Efficiency
%
Conditions
f
Oscillation Frequency
Line Regulation
kHZ
mV
Conditions
∆VOLINE
Conditions
∆VOLOAD
Conditions
∆VO/∆Ta
IS1
VIN=15V, IO=0.5A
25
VIN=20V, IO=0.5A
40
VIN=21V, IO=0.5A
50
VIN=24V, IO=0.5A
60
80
100
120
130
VIN=8 to 30V, IO=0.5A
VIN=10 to 30V, IO=0.5A
10 40
VIN=15 to 30V, IO=0.5A
10 40
VIN=18 to 30V, IO=0.5A
10 40
10
30
Load Regulation
mV
VIN=15V, IO=0.2 to 0.8A
±0.5
VIN=20V, IO=0.2 to 0.8A
VIN=21V, IO=0.2 to 0.8A
VIN=24V, IO=0.2 to 0.8A
Temperature Coefficient of Output Voltage
±0.5
±1.0
±1.0
mV/°C
Overcurrent Protection
Starting Current
1.6
1.6
1.6
1.6
A
V
Conditions
VSSL
VIN=15V
VIN=20V
VIN=21V
VIN=24V
Low Level Voltage
0.5
0.5
0.5
0.5
*
ON/OFF
Outflow Current
ISSL
100
100
100
100
Pin
µA
mA
µA
at Low Voltage
Conditions
Iq
VSSL=0V
7
7
7
7
Conditions
Iq(oFF)
VIN=15V, Io=0A
VIN=20V, Io=0A
VIN=21V, Io=0A
VIN=24V, Io=0A
Quiescent Circuit Current
200
200
VIN=20V, VON/OFF=0.3V
200
200
Conditions
VIN=15V, VON/OFF=0.3V
VIN=21V, VON/OFF=0.3V
VIN=24V, VON/OFF=0.3V
*: 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.
SI-8000JD
SI-8000JD
SI-8000JD
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.
5
ON/OFF
5
ON/OFF
C3
5
ON/OFF
C3
The ON/OFF pin is pulled up to the power supply in the IC, so applying the external voltage is
prohibited.
VOUT. ON/OFF
Soft Start
Soft Start
+VOUT. ON/OFF
ICs
16
ETC [ ETC ]
