1-1-3 DC/DC Converter ICs
SI-8000HD Series
Surface-Mount, Separate Excitation Step-down Switching Mode
■Features
• Surface-mount package (TO263-5)
• Output current: 5.5 A
• High efficiency: 83% (at TYP, Vo = 5 V)
• Requires only 5 discrete components (SI-
8008HD)
• Built-in reference oscillator (150 kHz)
• Built-in drooping-type overcurrent and thermal
protection circuits
• Built-in soft start circuit (Output ON/OFF
available)
• Low current consumption during off
■Absolute
Maximum Ratings
Parameter
Input Voltage
Power Dissipation
*1
Junction Temperature
*2
Storage Temperature
Thermal Resistance (Junction to Case)
Thermal Resistance (Junction to Ambient Air)
Symbol
V
IN
P
D
T
j
T
stg
θ
j-c
θ
j-a
Ratings
43
3
+150
–40 to +150
3
33.3
Unit
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
*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.
■Applications
• DVD recorder, FPD-TV
• Onboard local power supplies
• OA equipment
■Recommended
Operating Conditions
Parameter
Input Voltage Range
Output Voltage Range
Output Current Range
Operating Junction Temperature Range
Operating Temperature Range
Symbol
V
IN
V
O
I
O
T
jop
T
op
Ratings
SI-8008HD
Vo+3
*1
to 40
0.8 to 24
0 to 5.5
–30 to +100
–30 to +85
Unit
V
V
A
°C
°C
V
IN
≥
Vo+3V
Conditions
*1: The minimum value of the input voltage range is 4.5 V or Vo+3 V, whichever is higher.
■Electrical
Characteristics
Ratings
Paramter
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 Current at Low Voltage
V
ADJ
Conditions
(∆V
ADJ
/∆T)
Conditions
η
Conditions
fo
Conditions
∆V
OLINE
Conditions
∆V
OLOAD
Conditions
I
S
Conditions
V
SSL
I
SSL
Conditions
I
q
Quiescent Circuit Current
Conditions
I
q(OFF)
Conditions
10
V
SSL
=0V
6
V
IN
=15V, Io=0A
200
V
IN
=15V, V
SS
=0V
5.6
0.784
SI-8008HD
typ.
0.800
V
IN
=15V, Io=1A
±0.1
V
IN
=15V, Io=1A, Tc=0 to 100°C
83
V
IN
=15V, Io=3A
150
V
IN
=15V, Io=3A
60
V
IN
=10 to 30V, Io=3A
20
V
IN
=15V, Io=0.2 to 5.5A
6.5
V
IN
=15V
(R1=4.2kΩ, R2=0.8kΩ when Ta=25°C and Vo=5V)
Unit
max.
0.816
V
mV/°C
%
kHz
80
50
7.5
0.5
30
mV
mV
A
V
µA
mA
400
µA
*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.
SI-8008HD
SI-8008HD
SI-8008HD
5 SS
5 SS
C3
5 SS
C3
V
O.
ON/OFF
Soft start
Soft start
+Vo. On/OFF
34
ICs
SI-8000HD Series
■External
Dimensions (TO263-5)
Case temperature
measurement point
(0.40)
±0.2
(Unit : mm)
10.0
±0.2
(8.0)
4.5
3-R0.3
±0.2
1.2
(15°)
(4.4)
1.3
–0.05
+0.10
(6.8)
±0.2
9.2±
±0.3
15.3
(3°)
±0.1
0.10
(3°)
±0.15
2.4
(R0.3)
±0.3
±0.2
2.0
15.30
±0.3
9.2
±0.2
φ
1.5 Dp:
±0.2
(3°)
(2×R0.45)
Pin Assignment
1
IN
2
SW
3
GND
4
ADJ
5
SS
Plastic Mold Package Type
Flammability: UL 94V-0
Product Mass: Approx. 1.48 g
(4.6)
±0.2
(1.75)
(0.75)
4.9
0.88
±0.10
(R0.3)
2.54
0 to 6°
(0.5)
(1.7
±0.25
(1.7
±0.25
)
1
2
3
4
9.9
±0.2
0.8
±0.25
)
(1.7
5
(3°)
±0.1
)
0.8
±0.25
(1.7
)
±0.1
(3°)
2-R0.3
10.0
±0.02
■Block
Diagram
SI-8008HD
1
IN
PReg.
5
SS
ON/OFF
Soft
start
4.9
±0.2
SW
OCP
Latch &
Drive
2
Reset
OSC
+
–
ADJ
Comp.
Error Amp.
–
+
+
TSD
4
GND
3
V
REF
■Typical
Connection Diagram
L
1
V
IN
1
IN
SW
2
R
1
ADJ 4
R
2
Di
+
V
OUT
■Reference
Data
The acceptable loss of the package is 3 W for the SI-8000HD
series, so some ranges are not available, depending on the
relation between the input voltage and output current.
SI-8008HD
+
C
1
C
4
SS
5
C
3
GND
GND
3
Thermal Resistance
(junction to ambient air temperature)
θj-a
(°C/W)
C
2
55
When using glass-epoxy board measuring 40×40 mm
50
45
40
35
30
0
GND
: 1500µF
: 1000µF
: 0.1µF (Only when using soft-start function)
: 4.7µF (GMR32ER71H475KA88L (Murata Manufacturing)
recommended)
L
1
: 100µH
D
i
: FMB-G16L (Sanken)
C
1
C
2
C
3
C
4
200
400
600
800
1000
1200
1400
1600
1800
Copper Laminate Area (mm
2
)
ICs
35
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