SI-8008TM Datasheet, PDF (1/2 Pages) Sanken electric – Surface-Mount, Separate Excitation Step-down Switching Mode

1-1-3 DC/DC Converter ICs
SI-8000TM Series Surface-Mount, Separate Excitation Step-down Switching Mode
■Features
• Compact surface-mount package (TO252-5)
• Output current: 1.5 A
• High efficiency: 81% typ. (at Vo = 5 V)
• Requires only 4 discrete components
• Built-in reference oscillator (300 kHz)
• Built-in drooping-type-overcurrent and thermal
protection circuits
• Output ON/OFF available (circuit current at
output OFF: 200 µA typ.)
• Soft start available by ON/OFF pin
■ Applications
• Onboard local power supplies
• AV equipment
• OA equipment
■Absolute Maximum Ratings
Parameter
DC Input Voltage
Power Dissipation
Junction Temperature^*
Storage Temperature
Thermal Resistance (Junction to Case)
Thermal Resistance (Junction to
Ambient Air)
Symbol
VIN
PD1
PD2
Tj
Tstg
θ j-c
Ratings
43
1.06
1.65
–30 to +150
–40 to +150
6
θ j-a
95
Unit
V
W
°C
°C
°C/W
°C/W
Conditions
When mounted on glass-epoxy board (900 mm² copper area 4.3%)
When mounted on glass-epoxy board (900 mm² copper area 50%)
When mounted on glass-epoxy board (900 mm² copper area 4.3%)
*: This product has built-in thermal protection circuits that may operate when the junction temperature rises above
130°C.
The recommended design for the junction temperature during operation is below 125°C.
■Recommended Operating Conditions
Ratings
Parameter
Symbol
SI-8008TM
Unit
Input Voltage Range
VIN
VO+3*¹ to 40
V
Output Voltage
VO
0.8 to 24
V
Output Current Range
IO
0 to 1.5
A
Operating Junction Temperature Range
Tjop
–20 to +100
°C
Operating Temperature Range
Top
–20 to +85
°C
*1: The minimum value of an input voltage range is the higher of 4.5 V or VO + 3 V.
■Electrical Characteristics
Parameter
Symbol
Reference Voltage
VADJ
Conditions
Temperature Coefficient of
Reference Voltage
∆VADJ/∆T
Conditions
Efficiency
η
Conditions
Oscillation Frequency
fo
Conditions
Line Regulation
∆VOLINE
Conditions
Load Regulation
∆VOLOAD
Conditions
IS
Overcurrent Protection Starting Current
Conditions
Low Level Voltage VSSL
ON/OFF Pin* Outflow Current ISSL
at Low Voltage
Conditions
Iq
Quiescent Circuit Current
Iq (OFF)
Conditions
Conditions
min.
0.784
1.6
Rating
SI-8008TM
typ.
0.800
VIN=15V, Io=0.1A
±0.1
VIN=15V, Io=0.1A, Tc=0 to 100°C
81
VIN=15V, Io=0.5A
300
VIN=15V, Io=0.5A
60
VIN=10 to 30V, Io=0.5A
10
VIN=15V, Io=0.2 to 1.5A
VIN=15V
10
VSSL=0V
6
VIN=15V, Io=0A
200
VIN=15V, VSS=0V
max.
0.816
80
40
0.5
40
400
*: Pin 5 is the SS pin. Soft start at power on can be performed with a capacitor connected to this pin. The
output can also be turned ON/OFF with this pin.
The output is stopped by setting the voltage of this pin to VSSL or lower. SS-pin voltage can be changed
with an open-collector drive circuit of a transistor. When using both the soft-start and ON/OFF functions
together, the discharge current from C3 flows into the ON/OFF control transistor. Therefore, limit the
current securely to protect the transistor if C3 capacitance is large. The SS pin is pulled up to the power
supply in the IC, so applying the external voltage is prohibited. If the pin is not used, leave it open.
SI-8000TM
5 SS
SI-8000TM
5 SS
C3
(Ta=25°C)
Unit
V
mV/°C
%
kHz
mV
mV
A
V
µA
mA
µA
SI-8000TM
5 SS
C3
VO. ON/OFF
Soft start
Soft start
+VO. ON/OFF
18 ICs