SI-8000TFE Datasheet, PDF (1/2 Pages) Sanken electric – Full-Mold Separate Excitation Step-down Switching Mode Regulator ICs

1-1-2 Switching Mode Regulator ICs
SI-8000TFE Series Full-Mold, Separate Excitation Step-down Switching Mode Regulator ICs
■Features
• Compact full-mold package (equivalent to
TO220)
• 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 dropping-type-overcurrent and thermal
protection circuits
• Output ON/OFF available (circuit current at
output OFF: 200µA typ.)
• Soft start available by ON/OFF pin
■Applications
• Onboard local power supplies
• AV equipment
• OA equipment
■Lineup
Part Number
VO (V)
IO (A)
SI-8008TFE
Variable (0.8 to 24)
1.5
SI-8050TFE
5
■Absolute Maximum Ratings
Parameter
Symbol
Ratings
Unit
Conditions
DC Input Voltage
VIN
43
V
PD1-1
17.8 (with infinite heatsink)
Limited by thermal protection, Tjmax=150°C
Power Dissipation
PD1-2
14.2 (with infinite heatsink)
Tjmax=125°C
W
PD2-1 2.15 (without heat sink, standalone operation)
Limited by thermal protection, Tjmax=150°C
PD2-2 1.72 (without heatsink, standalone operation)
Tjmax=125°C
Junction Temperature*
Tj
–30 to +150
°C
Storage Temperature
Tstg
–40 to +150
°C
Thermal Resistance (Junction to Case)
θ j-c
7
°C/W
Thermal Resistance (Junction to Ambient Air) θj-a
58
°C/W
*: 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
Parameter
Symbol
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 an input voltage range is the higher of 4.5 V or VO + 3 V.
SI-8008TFE
Vo+3^*1 to 40
0.8 to 24
■Electrical Characteristics
Parameter
Symbol
Output Voltage
(Reference Voltage)
Vo
(VADJ)
Conditions
Temperature Coefficient of Output Voltage
(Temperature Coefficient of Reference Voltage)
∆Vo/∆T
(∆VREF/∆T)
Conditions
Efficiency
η
Conditions
Oscillation Frequency
Line Regulation
Load Regulation
Overcurrent Protection
Starting Current
ON/OFF Pin*
Low Level Voltage
Outflow Current at
Low Voltage
fo
Conditions
∆VOLINE
Conditions
∆VOLOAD
Conditions
IS
Conditions
VSSL
ISSL
Conditions
Iq
Quiescent Circuit Current
Iq(OFF)
Conditions
Conditions
Ratings
SI-8008TFE
min.
typ.
max.
0.784
0.800
VIN=15V, Io=0.1A
0.816
±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
80
VIN=10 to 30V, Io=0.5A
10
40
VIN=15V, Io=0.2 to 1.5A
1.6
VIN=15V
0.5
10
40
VSSL=0V
6
VIN=15V, Io=0A
200
400
VIN=15V, VSS=0V
*: 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 cur-
rent 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.
Ratings
0 to 1.5
–20 to +125
–20 to +125
SI-8050TFE
8 to 40
5.0
Ratings
SI-8050TFE
min.
typ.
max.
4.90
5.00
5.10
VIN=15V, Io=0.1A
±0.5
VIN=15V, Io=0.1A, Tc=0 to 100°C
81
VIN=15V, Io=0.5A
300
VIN=15V, Io=0.5A
60
80
VIN=10 to 30V, Io=0.5A
10
40
VIN=15V, Io=0.2 to 1.5A
1.6
VIN=15V
0.5
10
40
VSSL=0V
6
VIN=15V, Io=0A
200
400
VIN=15V, VSS=0V
SI-8000TFE
5 SS
SI-8000TFE
5 SS
C3
Unit
(Ta=25°C)
V
V
A
°C
°C
(Ta=25°C)
Unit
V
mV/°C
%
kHz
mV
mV
A
V
µA
mA
µA
SI-8000TFE
5 SS
C3
66 ICs
VO.ON/OFF
Soft start
Soft start
+VO.ON/OFF