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
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
Ratings
30
1.35
–30 to +150
–40 to +150
40
74
Unit
V
W
°C
°C
°C/W
°C/W
When mounted on glass-epoxy board, 30×30 mm (copper laminate area: 25×25 mm)
When mounted on glass-epoxy board, 30×30 mm (copper laminate area: 25×25 mm)
Conditions
θ
j-c
θ
j-a
*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
Ratings
Parameter
DC 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
SI-8005Q
Vo+3
*1
to 28
0.5 to 24
0 to 3.5
–30 to +125
–30 to +85
Unit
V
V
A
°C
°C
Conditions
*1: The minimum value of the input voltage range is 4.75 V or Vo +3 V, whichever is higher.
■Electrical
Characteristics
Rating
Parameter
Symbol
min.
Reference Voltage
Temperature Coefficient of Reference Voltage
Efficiency
Oscillation Frequency
Line Regulation
Load Regulation
Overcurrent Protection Starting Current
V
ADJ
Conditions
∆V
ADJ
/∆T
Conditions
0.485
SI-8005Q
typ.
0.500
V
IN
=12V, Io=1A
0.05
(R1=4.2kΩ, R2=0.8kΩ when Ta = 25°C and Vo=5V)
Unit
max.
0.515
V
mV/
°C
%
550
60
60
6.0
kHz
mV
mV
A
mA
20
V
IN
=12V, Io=1A, Ta=–40 to +85°C
90
V
IN
=12V, Io=1A
450
500
V
IN
=16V, Io=1A
30
V
IN
=8 to 28V, Io=1A
30
V
IN
=12V, Io=0.1 to 3.5A
3.6
V
IN
=12V
18
V
IN
=12V, Io=0A, V
EN
=open
V
IN
=12V, Io=0A, V
EN
=0V
5
V
IN
=16V, V
SSL
=0V
2.8
V
IN
=12V
2.2
V
IN
=12V
5
V
EN
=0V
1000
800
0.35
92
100
η
Conditions
fo
Conditions
∆V
OLINE
Conditions
∆V
OLOAD
Conditions
I
S
Conditions
Iq
Conditions
Iq
(OFF)
Conditions
I
SSL
Conditions
Vc
/EN
Conditions
Vc
/EL
Conditions
I
C/EH
Conditions
AEA
GEA
1/GCS
DMAX
DMIN
Quiescent Circuit Current
µ
A
µ
A
V
V
SS Pin
Outflow Current at Low Voltage
High Level Voltage
EN Pin
Low Level Voltage
Inflow Current at Low Low Voltage
µ
A
V/V
Error Amplifier Voltage Gain
Error Amplifier Transformer Conductance
Current Sense Amplifier Impedance
Maximum ON Duty
Minimum ON Time
µ
A/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
模拟电子
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