1-1-3 DC/DC Converter ICs
SI-8100QL Series
Current Mode Control Step-down Switching Mode
■Features
• DIP8 package
• Introduction of current mode control method
• Output current: 3.5A
• High efficiency: 90% (Vo=5V)
• Built-in reference oscillator (350kHz)
• 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
Tj
Tstg
θj-c
θj-a
Ratings
30
1.56
–30 to +150
–40 to +150
25
64
Unit
V
W
°C
°C
°C/W
°C/W
When mounted on glass-epoxy board measuring 70×60 mm (copper laminate area: 1310 mm
2
)
When mounted on glass-epoxy board measuring 70×60 mm (copper laminate area: 1310 mm
2
)
Conditions
*1: Limited by thermal protection circuit
*2: Note that the detect temperature for thermal protection is about 140°C.
■Recommended
Operating Conditions
Parameter
Input Voltage Range
Output Voltage Range
Output Current Range
Operating Junction Temperature Range
Operating Temperature Range
Symbol
V
IN
Vo
Io
Tjop
Top
Ratings
SI-8105QL
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
■Applications
• DVD recorder, FPD-TV
• Onboard local power supplies
• OA equipment
*1: The minimum value of the input voltage range is 4.75 V or Vo +3 V, whichever is higher.
■Electrical
Characteristics
Ratings
(When Ta=25°C and Vo=5V)
Symbol
min.
V
ADJ
Conditions
(∆V
ADJ
/∆T)
Conditions
η
Conditions
fo
Conditions
∆Vo
LINE
Conditions
∆Vo
LOAD
Conditions
Is
Conditions
Iq
Conditions
Iq
(OFF)
Conditions
V
IN
=12V, Io=0A, V
EN
=0V
5
Conditions
V
C/EH
Conditions
V
C/EL
Conditions
I
C/EH
Conditions
AEA
GEA
1/GCS
DMAX
DMIN
V
IN
=12V
5
V
EN
=0V
1000
800
0.35
92
100
2.8
V
IN
=12V
2.2
V
IN
=12V, V
SSL
=0V
I
SSL
3.6
V
IN
=12V
18
V
IN
=12V, Io=0A, V
EN
=open
20
315
0.485
SI-8105QL
typ.
0.500
V
IN
=12V, Io=1A
0.05
V
IN
=12V, Io=1A, Ta=–40 to +85°C
90
V
IN
=12V, Io=1A
350
V
IN
=16V, Io=1A
30
V
IN
=8 to 28V, Io=1A
30
V
IN
=12V, Io=0.1 to 3.5A
6.0
60
60
385
max.
0.515
V
mV/
°C
%
kHz
mV
mV
A
mA
µA
µA
V
V
µA
V/V
µA/V
V/A
%
nsec.
Unit
Parameter
Reference Voltage
Temperature Coefficient of Reference Voltage
Efficiency
Oscillation Frequency
Line Regulation
Load Regulation
Overcurrent 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 Voltage
Error Amplifier Voltage Gain
Error Amplifier Transformer Conductance
Current Sense Amplifier Impedance
Maximum ON Duty
Minimum ON Time
*: 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-8100QL
8 SS
C5
Soft start
42
ICs
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