SI-8000Q Datasheet, PDF (1/2 Pages) Sanken electric – Surface Mount, Current Mode Cntrol Step-down Switching Mode

1-1-3 DC/DC Converter ICs
SI-8000Q Series Surface Mount, Current Mode Cntrol Step-down Switching Mode
■Features
• Compact surface-mount package (HSOP8)
• Introduction of current mode control method
• Output current: 3.5 A
• High efficiency: 90% (Vo = 5 V)
• Built-in reference oscillator (500 kHz)
• A ceramic capacitor can be used for output
• Built-in drooping-type overcurrent and thermal
protection circuits
• Built-in soft start circuit
• Built-in on/off function (Active Hi)
• Low current consumption during off
■Absolute Maximum Ratings
Parameter
Symbol
Ratings
Unit
Conditions
Input Voltage
VIN
30
V
Power Dissipation^*1
PD
1.35
W
When mounted on glass-epoxy board, 30×30 mm (copper laminate area: 25×25 mm)
Junction Temperature^*2
Tj
–30 to +150
°C
Storage Temperature
Tstg
–40 to +150
°C
Thermal Resistance(junction to case)
θ j-c
40
°C/W
Thermal Resistance(junction to ambient air) θj-a
74
°C/W When mounted on glass-epoxy board, 30×30 mm (copper laminate area: 25×25 mm)
*1: Limited by thermal protection circuit
*2: Note that the detection temperature for thermal protection is about 140°C.
■Applications
• DVD recorder, FPD-TV
• Onboard local power supplies
• OA equipment
■Recommended Operating Conditions
Parameter
Symbol
Ratings
SI-8005Q
DC Input Voltage Range
VIN
Vo+3^*1 to 28
Output Voltage Range
VO
0.5 to 24
Output Current Range
IO
0 to 3.5
Operating Junction Temperature Range
Tjop
–30 to +125
Operating Temperature Range
Top
–30 to +85
*1: The minimum value of the input voltage range is 4.75 V or Vo +3 V, whichever is higher.
Unit
Conditions
V
V
A
°C
°C
■Electrical Characteristics
Parameter
Symbol
min.
Reference Voltage
VADJ
Conditions
0.485
Temperature Coefficient of Reference Voltage
∆VADJ/∆T
Conditions
Efficiency
η
Conditions
Oscillation Frequency
GP
450
Conditions
Line Regulation
∆VOLINE
Conditions
Load Regulation
∆VOLOAD
Conditions
Overcurrent Protection Starting Current
IS
3.6
Conditions
Iq
Quiescent Circuit Current
Conditions
Iq(OFF)
Conditions
SS Pin Outflow Current at Low Voltage
ISSL
Conditions
High Level Voltage
Vc/EN
2.8
Conditions
EN Pin Low Level Voltage
Vc/EL
Conditions
Inflow Current at Low Low Voltage
IC/EH
Conditions
Error Amplifier Voltage Gain
AEA
Error Amplifier Transformer Conductance
GEA
Current Sense Amplifier Impedance
1/GCS
Maximum ON Duty
DMAX
Minimum ON Time
DMIN
*: Pin 8 is the SS pin. Soft start at power on can be performed with a capacitor connected to this pin.
The SS pin is pulled up to the power supply in the IC, so applying the external voltage is prohibited.
(R1=4.2kΩ, R2=0.8kΩ when Ta = 25°C and Vo=5V)
Rating
4*2
typ.
0.500
VIN=12V, Io=1A
0.05
VIN=12V, Io=1A, Ta=–40 to +85°C
90
VIN=12V, Io=1A
500
VIN=16V, Io=1A
30
VIN=8 to 28V, Io=1A
30
VIN=12V, Io=0.1 to 3.5A
VIN=12V
18
VIN=12V, Io=0A, VEN=open
VIN=12V, Io=0A, VEN=0V
5
VIN=16V, VSSL=0V
max.
0.515
550
60
60
6.0
20
Unit
V
mV/ °C
%
kHz
mV
mV
A
mA
µA
µA
VIN=12V
VIN=12V
5
VEN=0V
1000
800
0.35
92
100
V
2.2
V
µA
V/V
µA/V
V/A
%
nsec.
SI-8008Q
8 SS
C8
30 ICs
Soft start