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
Junction Temperature*2
Storage Temperature
Thermal Resistance (junction to
case)
Thermal Resistance (junction to
ambient air)
Symbol
VIN
Ratings
30
1.35
–30 to +1 50
–40 to +1 50
40
°C
°C
°C/W
Unit
V
W
Conditions
When mounted on glass–epoxy board, 30×30 mm (copper
laminate area : 25×25 mm)
PD
Tj
Tstg
θj-c
θj-a
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
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
Ratings
SI-8005Q
Vo+3*1 to 28
Unit
V
V
A
°C
°C
Conditions
0.5 to 24
0to3.5
–30 to +125
–30 to +85
*1 : The minimum value of the input voltage range is 4.75 V or Vo +3 V, whichever is higher.
■
Electrical Characteristics
Parameter
(R1=46kΩ, R2=5.1kΩ when Ta = 25°C and Vo=5V)
Symbol
min.
V
AD
J
Rating
SI-8005Q
typ.
0.500
V
IN
=12V, Io=1A
Unit
max.
0.515
V
Reference Voltage
0.485
Conditions
Temperature Coefficient of Reference Voltage
Efficiency
Oscillation Frequency
∆V
ADJ
/∆T
0.05
Conditions
V
IN
=12V, Io=1 A, Ta=–40 to +85°C
90
Conditions
VIN=12V, Io=1A
mV/°C
η
fo
Conditions
∆V
OL
NE
%
550
60
60
6.0
kHz
mV
450
500
V
IN
=16V, Io=1A
30
Conditions
V
IN
=8 to 28V, Io=1 A
30
Conditions
V
IN
=12V, Io=0.1 to 3.5A
3.6
Conditions
V
IN
=12V
Line Regulation
Load Regulation
Over current Protection Starting Current
∆V
OL
AD
mV
A
mA
I
S
Iq
Quiescent Circuit Current
Iq
(OFF)
18
Conditions
Conditions
V
IN
=12V, Io=0A, V
EN
=open
20
V
IN
=12V, Io=0A, V
EN
=0V
µA
µA
V
SS Pin
Outflow Current at Low Voltage
I
SSL
5
Conditions
V
IN
=1 6V, V
SSL
=0V
V
c
/
N
2.8
Conditions
V
IN
=12V
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
V
c
/
L
2.2
Conditions
V
IN
=12V
V
µA
V/V
µA/V
V/A
%
nsec.
I
C/E
H
5
Conditions
V
EN
=0V
AEA
GEA
1/GCS
DMAX
DMIN
1000
800
0.35
92
100
*: 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
stm32/stm8
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