1-1-3 DC/DC Converter ICs
SI-8000HFE Series Full-Mold, Separate Excitation Step-down Switching Mode
■Features
■Lineup
• Compact full-mold package (equivalent to
TO220)
Part Number
SI-8008HFE
VO (V)
Variable (0.8 to 15)
• Output current: 5.5 A
SI-8050HFE
5
IO (A)
5.5
• High efficiency: 83% typ. (at Vo = 5 V)
• Requires only 4 discrete components
• Built-in reference oscillator (150 kHz)
■Absolute Maximum Ratings
• Built-in drooping-type-overcurrent and
thermal protection circuits
Parameter
Symbol
Ratings
Unit
VIN
43
V
PD1-1
25 (with infinite heatsink)
PD1-2
20 (with infinite heatsink)
PD2-1
2.15 (without heat sink, standalone operation)
PD2-2
1.72 (without heatsink, standalone operation)
Tj
+150
Storage Temperature
Tstg
–40 to +150
°C
Thermal Resistance (Junction to Case)
θ j-c
5
°C/W
Thermal Resistance (Junction to Ambient Air)
θ j-a
58
°C/W
DC Input Voltage
• Built-in soft start circuit (Output ON/OFF
available)
Power Dissipation
■Applications
Junction Temperature*
• Onboard local power supplies
• OA equipment
Conditions
Limited by thermal protection, Tjmax=150°C
Tjmax=125°C
W
Limited by thermal protection, Tjmax=150°C
Tjmax=125°C
°C
*: This product has built-in thermal protection circuits that may operate when the junction temperature rises above 130°C.
The recommended design for the junction temperature during operation is below 125°C.
■Recommended Operating Conditions
Ratings
Parameter
Symbol
Input Voltage Range
VO
Output Current Range
8 to 40
5.0
Tjop
Operating Temperature Range
Top
(Ta=25°C)
V
V
A
0 to 5.5
–30 to +125
–30 to +85
IO
Operating Junction Temperature Range
Unit
SI-8050HFE
Vo+3*1 to 40
0.8 to 24
VIN
Output Voltage Range
SI-8008HFE
°C
°C
*1: The minimum value of an input voltage range is the higher of 4.5 V or VO + 3 V.
■Electrical Characteristics
(Ta=25°C)
Ratings
Parameter
Output Voltage
Reference Voltage
Temperature Coefficient of Output Voltage
Temperature Coefficient of Reference Voltage
Symbol
Vo
VADJ
0.784
Conditions
η
Efficiency
Conditions
Oscillation Frequency
SI-8008HFE (at Vo = 5 V)
max.
min.
typ.
Conditions
∆Vo/∆T
∆VADJ/∆T
Conditions
Outflow Current at
Low Voltage
50
VIN=15V
Conditions
10
VSSL=0V
Conditions
6
VIN=15V, Io=0A
200
VIN=15V, VSS=0V
VSSL
ISSL
Iq
Iq(OFF)
400
0.5
30
200
VIN=15V, VSS=0V
SI-8000HFE
5 SS
mV
mV
A
10
VSSL=0V
V
µA
mA
400
SI-8000HFE
5 SS
C3
VOUT. ON/OFF
ICs
50
6
VIN=15V, Io=0A
*: Pin 5 is the SS 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. SS-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 SS pin is pulled up to the
power supply in the IC, so applying the external voltage is prohibited. If the pin is not used,
leave it open.
52
80
VIN=15V
0.5
30
%
kHz
5.6
Conditions
Quiescent Circuit Current
mV/°C
80
5.6
Conditions
Low Level Voltage
ON/OFF Pin*
V
VIN=15V, Io=1A
±0.5
150
VIN=15V, Io=3A
60
VIN=10 to 30V, Io=3A
20
VIN=15V, Io=0.2 to 5.5A
∆VOLOAD
IS
0.816
150
VIN=15V, Io=3A
60
VIN=10 to 30V, Io=3A
20
VIN=15V, Io=0.2 to 5.5A
fo
Conditions
Overcurrent Protection
Starting Current
max.
5.10
VIN=15V, Io=1A, Tc=0 to 100°C
83
VIN=15V, Io=3A
∆VOLINE
Load Regulation
0.800
VIN=15V, Io=1A
Unit
SI-8050HFE
typ.
5.00
min.
4.90
±0.1
VIN=15V, Io=1A, Tc=0 to 100°C
83
VIN=15V, Io=3A
Conditions
Line Regulation
Ratings
Soft start
µA
SI-8000HFE
5 SS
C3
Soft start
+VOUT. ON/OFF
