SPI-8000A_11 Datasheet, PDF (1/3 Pages) Sanken electric – Surface Mount, Separate Excitation Step-down Switching Mode

1-1-3 DC/DC Converter ICs
SPI-8000A Series Surface Mount, Separate Excitation Step-down Switching Mode
■Features
• Surface-mount 16 pin package
• Output current: 3.0A
• High efficiency: 91% (at VIN = 10V, lO = 1A, VO
= 5V)
• Capable of downsizing a choke-coil due to IC's
high switching frequency (125kHz). (Com-
pared with conventional Sanken devices)
• The output-voltage-variable type can vary its
output voltage from 1V to 14V because of its
low reference voltage (Vref) of 1V.
• Wide Input Voltage Range (8 to 50V)
• Output ON/OFF available
• Built-in overcurrent and thermal protection
circuits
■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
PD*1, ^*2
Tj
Tstg
θ j-c*2
θ j-a*2
Ratings
53
2.4
+125
–40 to +125
18
50
*1: Limited due to thermal protection.
*2: When mounted on glass-epoxy board 700cm² (copper laminate area 30.8cm²).
(Ta=25°C)
Unit
V
W
°C
°C
°C/W
°C/W
■Applications
• Onboard local power supplies
• OA equipment
• For stabilization of the secondary-side output voltage of switching power supplies
■Recommended Operating Conditions
Ratings
Parameter
Symbol
SPI-8010A
Unit
DC Input Voltage Range
VIN
(8 or Vo+3)^*1 to 50
V
Output Voltage Range
VO
1 to 14
V
Output Current Range^*2
IO
0.02 to 3.0^*2
A
Operating Junction Temperature Range
Tjop
–30 to +125
°C
Operating Temperature Range
Top
–30 to +125
°C
*1: The minimum value of an input voltage range is the higher of either 8V or VO+3V.
*2: Please be sure to let the output current run more than 20 mA. When using by less than 20 mA, there is a possibility that the output voltage becomes unstable.
■Electrical Characteristics
Parameter
Symbol
min.
Reference Voltage
VREF
Conditions
0.97
Efficiency
Eff
Conditions
Oscillation Frequency
FOSC
Conditions
Line Regulation
Load Regulation
Temperature Coefficient of
Reference Voltage
∆VOLINE
Conditions
∆VOLOAD
Conditions
∆VREF/∆Ta
Overcurrent Protection
IS
3.1
Starting Current
Conditions
Quiescent Circuit Current
Iq
Conditions
Circuit Current at Output OFF
Iq(off)
Conditions
CE/SS
Terminal
Low Level Voltage
Outflow Current at
Low Voltage
VSSL
ISSL
Conditions
Rating
SPI-8010A (Variable type)
typ.
1.00
VIN=12V, IO=1A
86
VIN=20V, IO=1A, VO=5V
250
VIN=12V, IO=1A
20
VIN=10 to 30V, IO=1A
10
VIN=12V, IO=0.1 to 1.5A
±0.5
VIN=12V
7
VIN=12V, IO=0A
VIN=12V, VON/OFF=0.3V
VSSL=0V
* Pin 4 is the CE/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. CE/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 C4 flows into the ON/OFF control transistor. Therefore,
limit the current securely to protect the transistor if C3 capacitance is large.
The CE/SS pin is pulled up to the power supply in the IC, so applying the external voltage is
prohibited.
SPI-8000A
4 CE/SS
max.
1.03
40
30
400
0.5
50
SPI-8000A
4 CE/SS
C4
(Ta=25°C)
Unit
V
%
kHZ
mV
mV
mV/°C
A
mA
µA
V
µA
SPI-8000A
4 CE/SS
C4
22 ICs
VO. ON/OFF
Soft start
Soft start
+VO. ON/OFF