1-1-3 DC/DC Converter ICs
SI-8000FD Series
Surface Mount, Separate Excitation Step-down Switching Mode
■Features
• Surface-mount package (TO263-5)
• Output current: 3.5 A
• High efficiency: 83% (Vo = 5 V, V
IN
= 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)
- SI-8001FDE
• Built-in on/off function (active Low)
- SI-8001FDL
• Low current consumption during off
- SI-8001FDL
■Lineup
Part Number
V
O
(V)
I
O
(A)
Function
Soft start
SI-8001FDE
Variable(0.8 to 24)
3.5
ON/OFF
SI-8001FDL
■Absolute
Maximum Ratings
Parameter
Input Voltage
ON/OFF Control Voltage
Power Dissipation
*1
Junction Temperature
*2
Storage Temperature
Thermal Resistance (Junction to Case)
Thermal Resistance (Junction to Ambient Air)
Symbol
V
IN
V
c
P
D
T
j
T
stg
θ
j-c
θ
j-a
–
3
+150
–40 to +150
3
*1
33.3
*1
Ratings
SI-8001FDE SI-8001FDL
43
V
IN
Unit
V
V
W
°C
°C
°C/W
°C/W
When mounted on glass-epoxy board measuring 40×40 mm (copper laminate area: 100%)
When mounted on glass-epoxy board measuring 40×40 mm (copper laminate area: 100%)
When mounted on glass-epoxy board measuring 40×40 mm (copper laminate area: 100%)
Conditions
■Applications
• DVD recorder, FPD-TV
• OA equipment, such as printers
• Onboard local power supplies
*1 : Limited by thermal protection circuit
*2 : 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
Input Voltage Range
Symbol
Ratings
SI-8001FDE
Vo+3
*1
to 40
0.8 to 24
0 to 3.5
–30 to +100
–30 to +85
SI-8050FDL
Unit
V
V
A
°C
°C
V
IN
Output Voltage Range
V
O
Output Current Range
I
O
Operating Junction Temperature Range
T
jop
Operating Temperature Range
T
op
*1: The minimum value of the input voltage range is 4.5 V or Vo + 3 V, whichever is higher.
■Electrical
Characteristics
Ratings
Parameter
Symbol
min.
Reference Voltage
Temperature Coefficient of Reference Voltage
Efficiency
Oscillation Frequency
Line Regulation
Load Regulation
Overcurrent Protection Starting Current
Low Level Voltage
SS Pin
*1
Outflow Cuurent
at Low Voltage
ON/OFF Control Voltage (Output on)
ON/OFF Pin
*2
ON/OFF Control Voltage (Output off)
ON/OFF Controll Current (Output on)
V
ADJ
Conditions
∆V
ADJ
/∆T
Conditions
0.784
SI–8001FDE
typ.
0.800
V
IN
=15V, Io=0.2A
±0.1
V
IN
=15V, Io=0.2A, Tc=0 to 100°C
83
V
IN
=15V, Io=2A
270
300
V
IN
=15V, Io=2A
80
V
IN
=10 to 30V, Io=2A
50
V
IN
=15V, Io=0.2 to 3.5A
3.6
V
IN
=15V
0.5
6
V
IN
=15V, V
SS
=0V
–
–
–
–
–
–
–
6
V
IN
=15V, Io=0A
200
V
IN
=15V, Vss=0V
600
–
–
–
2.0
30
–
–
–
3.6
330
270
max.
0.816
min.
0.784
(R1=4.2kΩ, R2=0.8kΩ when Ta = 25°C and Vo=5V)
SI–8001FDL
typ.
0.800
V
IN
=15V, Io=0.2A
±0.1
V
IN
=15V, Io=0.2A, Tc=0 to 100°C
83
V
IN
=15V, Io=2A
300
V
IN
=15V, Io=2A
80
V
IN
=10 to 30V, Io=2A
50
V
IN
=15V, Io=0.2 to 3.5A
V
IN
=15V
–
–
–
–
–
–
0.8
6
Vc=2V
6
V
IN
=15V, Io=0A
30
V
IN
=15V, Vc=2V
200
100
330
max.
0.816
Unit
V
mV/
°C
%
kHz
mV
mV
A
V
η
Conditions
f
O
Conditions
∆V
OLINE
Conditions
∆V
OLOAD
Conditions
I
S
Conditions
V
SSL
I
SSL
Conditions
Vc, IH
Vc, IL
Ic, IH
Conditions
Iq
Conditions
Iq(OFF)
Conditions
µ
A
V
V
µ
A
mA
Quiescent Circuit Current
µ
A
*1: 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.
*2: Output is OFF when the output control terminal VC is open. Each input level is equivalent to
LS-TTL. Therefore, the device can be driven directly by LS-TTLs.
SI-8001FDE
SI-8001FDE
SI-8001FDE
5 SS
5 SS
C3
5 SS
C3
V
O.
ON/OFF
Soft start
32
ICs
Soft start
+Vo. On/OFF
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