SI-8005Q Datasheet, PDF (1/2 Pages) Sanken electric – Step-Down Switching Regulator with Current-Mode Control

1- 1-3 DC/DC Converter ICs
SI-8000Q Series Surface Mount, Current Mode Control Step-down Switching Mode
■ Features
• Compact surface-mount package (HSOP8)
• Introduction of current mode control method
• Output current: 3.5A
• High efficiency: 90% (Vo = 5 V)
• Built-in reference oscillator (500 kHz)
• A ceramic capacitor can be used for output
• Built-in drooping-type over current 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
Input Voltage
Power Dissipation*1
Symbol
VIN
PD
Junction Temperature*2
Tj
Storage Temperature
Tstg
Thermal Resistance (junction to
θj-c
case)
Ratings
30
1.35
–30 to +1 50
–40 to +1 50
40
Unit
V
W
°C
°C
°C/W
Conditions
When mounted on glass–epoxy board, 30×30 mm (copper
laminate area : 25×25 mm)
Thermal Resistance (junction to
θj-a
ambient air)
74
°C/W
When mounted on glass epoxy board, 30×30mm (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
DC Input Voltage Range
VIN
Output Voltage Range
VO
Output Current Range
IO
Operating Junction Temperature Range
Tjop
Operating Temperature Range
Top
*1 : The minimum value of the input voltage range is 4.75 V or Vo +3 V, whichever is higher.
Ratings
SI-8005Q
Vo+3*1 to 28
0.5 to 24
0to3.5
–30 to +125
–30 to +85
■ Electrical Characteristics
(R1=46kΩ, R2=5.1kΩ when Ta = 25°C and Vo=5V)
Unit
V
V
A
°C
°C
Conditions
Parameter
Reference Voltage
Temperature Coefficient of Reference Voltage
Efficiency
Oscillation Frequency
Line Regulation
Load Regulation
Over current Protection Starting Current
Quiescent Circuit Current
SS Pin Outflow Current at Low Voltage
High Level Voltage
EN Pin Low Level Voltage
Inflow Current at Low Low Voltage
Error Amplifier Voltage Gain
Error Amplifier Transformer Conductance
Current Sense Amplifier Impedance
Maximum ON Duty
Minimum ON Time
Symbol
VADJ
Conditions
∆VADJ/∆T
Conditions
η
Conditions
fo
Conditions
∆VOLNE
Conditions
∆VOLAD
Conditions
IS
Conditions
Iq
Conditions
Iq(OFF)
Conditions
ISSL
Conditions
Vc/N
Conditions
Vc/L
Conditions
IC/E H
Conditions
AEA
GEA
1/GCS
DMAX
DMIN
min.
0.485
450
3.6
2.8
Rating
SI-8005Q
typ.
0.500
VIN=12V, Io=1A
0.05
VIN=12V, Io=1 A, Ta=–40 to +85°C
90
VIN=12V, Io=1A
500
VIN=16V, Io=1A
30
VIN=8 to 28V, Io=1 A
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=1 6V, VSSL=0V
VIN=12V
VIN=12V
5
VEN=0V
1000
800
0.35
92
100
max.
0.515
550
60
60
6.0
20
2.2
Unit
V
mV/°C
%
kHz
mV
mV
A
mA
µA
µA
V
V
µA
V/V
µA/V
V/A
%
nsec.
*: 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.
SI-8008Q
8 SS
C8
30 ICs
Soft start