SI-8000HD Datasheet, PDF (1/2 Pages) Sanken electric – Surface-Mount, Separate Excitation Step-down Switching Mode

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
■Applications
• DVD recorder, FPD-TV
• Onboard local power supplies
• OA equipment
■Absolute Maximum Ratings
Parameter
Symbol
Ratings
Unit
Conditions
Input Voltage
VIN
43
V
Power Dissipation^*1
PD
Junction Temperature^*2
Tj
3
+150
W When mounted on glass-epoxy board measuring 40×40 mm (copper laminate area: 100%)
°C
Storage Temperature
Tstg
–40 to +150
°C
Thermal Resistance (Junction to Case)
θj-c
3
°C/W When mounted on glass-epoxy board measuring 40×40 mm (copper laminate area: 100%)
Thermal Resistance (Junction to Ambient Air) θj-a
33.3
°C/W When mounted on glass-epoxy board measuring 40×40 mm (copper laminate area: 100%)
*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
Symbol
Ratings
SI-8008HD
Input Voltage Range
VIN
Vo+3^*1 to 40
Output Voltage Range
VO
0.8 to 24
Output Current Range
IO
0 to 5.5
Operating Junction Temperature Range
Tjop
–30 to +100
Operating Temperature Range
Top
–30 to +85
*1: The minimum value of the input voltage range is 4.5 V or Vo+3 V, whichever is higher.
Unit
Conditions
V
V
A
VIN ≥ Vo+3V
°C
°C
■Electrical Characteristics
Paramter
Reference Voltage
Temperature Coefficient of Reference Voltage
Efficiency
Oscillation Frequency
Line Regulation
Load Regulation
Overcurrent Protection Starting Current
SS Pin^*1
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
5.6
*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.
(R1=4.2kΩ, R2=0.8kΩ when Ta=25°C and Vo=5V)
Ratings
SI-8008HD
Unit
typ.
max.
0.800
0.816
V
VIN=15V, Io=1A
±0.1
VIN=15V, Io=1A, Tc=0 to 100°C
mV/°C
83
%
VIN=15V, Io=3A
150
kHz
VIN=15V, Io=3A
60
80
mV
VIN=10 to 30V, Io=3A
20
50
mV
VIN=15V, Io=0.2 to 5.5A
6.5
7.5
A
VIN=15V
0.5
V
10
30
µA
VSSL=0V
6
mA
VIN=15V, Io=0A
200
400
µA
VIN=15V, VSS=0V
SI-8008HD
5 SS
SI-8008HD
5 SS
C3
SI-8008HD
5 SS
C3
VO.ON/OFF
Soft start
Soft start
+Vo. On/OFF
34 ICs