SI-8000FFE Datasheet, PDF (1/2 Pages) Sanken electric – Full-Mold, Separate Excitation Step-down Switching Mode

1-1-3 DC/DC Converter ICs
SI-8000FFE Series Full-Mold, Separate Excitation Step-down Switching Mode
■Features
• Compact full-mold package (equivalent to
TO220)
• Output current: 3.5 A
• High efficiency: 83% (Vo = 5 V, VIN = 15 V, Io = 2 A)
• Requires only 6 discrete components
• Built-in reference oscillator (300 kHz)
• Built-in drooping-type overcurrent and thermal
protection circuits
• Built-in soft start circuit (Output ON/OFF
available)
■Applications
• DVD recorder, FPD-TV
• OA equipment, such as printers
• Onboard local power supplies
■Lineup
Part Number
Vo (V)
Io (A)
Function
SI-8001FFE
7BSJBCMF
(0.8 to 24)
3.5
Soft start
■Absolute Maximum Ratings
Parameter
Ratings
Symbol
Unit
SI-8001FFE
Conditions
Input Voltage
VIN
43
V
Power Dissipation
(With infinite heatsink)
PD1-1
PD1-2
22.7
18.2
W
Limited by thermal protection circuit, Tj=150°C
Tj=125°C
Power Dissipation
(Without heatsink)
Junction Temperature^*1
PD2-1
PD2-2
Tj
2.15
1.72
+150
W
Limited by thermal protection circuit, Tjmax=150°C
Tj=125°C
°C
Storage Temperature
Tstg
–40 to +150
°C
Thermal Resistance (Junction to Case)
θj-c
5.5
°C/W
Thermal Resistance (Junction to Ambient Air) θj-a
58
°C/W
*: This product has built-in thermal protection circuits that may activate when the junction temperature exceeds 130°C.
The recommended design for the junction temperature during IC operation is below 125°C.
■Recommended Operating Conditions
Parameter
Symbol
Input Voltage Range
VIN
Output Voltage Range
VO
Output Current Range
IO
Operating Junction Temperature Range
Tjop
Operating Temperature Range
Top
*: The minimum value of the input voltage range is 4.5 V or Vo +3 V, whichever is higher.
■Electrical Characteristics
Parameter
Reference Voltage
Temperature Coefficient of Reference Voltage
Efficiency
Oscillation Frequency
Line Regulation
Load Regulation
Overcurrent Protection Starting Current
SS Pin
Low Level Voltage
Outflow Current at Low Voltage
Quiescent Circuit Current
Symbol
VADJ
Conditions
∆VADJ/∆T
Conditions
η
Conditions
fo
Conditions
∆VOLINE
Conditions
∆VOLOAD
Conditions
IS
Conditions
VSSL
ISSL
Conditions
Iq
Conditions
Iq(OFF)
Conditions
min.
0.784
270
3.6
*: 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 (3.7 V typ.) to the power supply in the IC, so
applying the external voltage is prohibited. If this pin is not used, leave it open.
Ratings
Unit
SI-8001FFE
Vo+3^*1 to 40
V
0.8 to 24
V
0 to 3.5
A
–30 to +125
°C
–30 to +85
°C
(R1=4.2kΩ, R2=0.8kΩ when Ta=25°C and Vo=5V)
Ratings
SI-8001FFE
Unit
typ.
max.
0.800
0.816
V
VIN=15V, Io=0.2A
±0.1
VIN=15V, Io=0.2A, Tc=0 to 100°C
mV/ °C
83
%
VIN=15V, Io=2A
300
330
kHz
VIN=15V, Io=2A
55
80
mV
VIN=10 to 30V, Io=2A
15
50
mV
VIN=15V, Io=0.2 to 3.5A
A
VIN=15V
0.5
V
6
30
µA
VIN=15V, VSS=0V
6
mA
VIN=15V, Io=0A
200
600
µA
VIN=15V, Vss=0V
SI-8000FFE
5 SS
SI-8000FFE
5 SS
C3
SI-8000FFE
5 SS
C3
VO.ON/OFF
Soft start
Soft start
+Vo. ON/OFF
50 ICs