1-1-3 DC/DC Converter ICs
SI-8000Y Series Current Mode Control Step-down Switching Mode ICs
Full-Mold, Separate Excitation Step-down Switching Mode Regulator
■Features
■Absolute Maximum Ratings
• Compact (equivalent to TO220) full-mold
package
Parameter
Symbol
Power Dissipation
45
V
PD1
• Output current: 8.0 A
Ratings
VIN
Input Voltage
Unit
20.8(With infinite heatsink)
W
W
–30 to +150
°C
Tstg
–40 to +150
°C
Thermal Resistance (Junction to Case)
θj-c
6
°C/W
Thermal Resistance (Junction to Ambient Air)
• Built-in drooping-type-overcurrent protection
and thermal protection circuits
1.8(Without heatsink, stand-alone operation)
Tj
Storage Temperature
• Built-in reference oscillator (130 kHz)
PD2
Junction Temperature
• High efficiency: 86%
θj-a
66.7
°C/W
• Built-in soft start circuit (Output ON/OFF
available)
• Low current consumption during off
■Applications
•
•
•
•
AV equipment
OA equipment
Gaming equipment
Onboard local power supplies
■Recommended Operating Conditions
Raings
Symbol
Parameter
SI-8010Y
Unit
SI-8050Y
Input Voltage Range
VIN
8 or VO+3* to 43
8 to 43
V
Output Voltage Range
Vo
1 to 15
5
V
Output Current Range
Io
0 to 8.0
A
Operating Junction Temperature Range
Tjop
–30 to +135
°C
Operating Temperature Range
Top
–30 to +85
°C
*: The minimum value of the input voltage range is 8 V or Vo + 3V, whichever is higher.
■Electrical Characteristics
Ratings
Parameter
Symbol
SI-8010Y*
mIN.
Output Voltage
(Reference voltage for SI-8010Y)
VO(VREF)
0.98
Conditions
Line Regulation
Load Regulation
Overcurrent Protection Starting Current
EN/SS Pin*
Low Level Voltage
Error Amplifier Voltage Gain
ISSL
Conditions
VIN=30V, Io=0.1A, Ta=0 to 100°C
86
VIN=30V, Io=3A
30
AEA
kHz
30
90
VIN=10 to 43V, Io=3A
90
30
VIN=30V, Io=0.1 to 8A
90
VIN=30V, Io=0.1 to 8A
8.1
8.1
VIN=20V
8
8
VIN=30V, Io=0A, EN/SS=open
200
500
VIN=30V, EN/SS=0V
10
200
VIN=30V, EN/SS=0V
mV
mA
500
VIN=30V, EN/SS=0V
30
mV
A
VIN=20V
VIN=30V, Io=0A, EN/SS=open
VSSL
Conditions
%
130
90
V
mV/°C
VIN=30V, Io=3A
VIN=10 to 43V, Io=3A
Conditions
Conditions
Outflow Current at
Low Voltage
±0.5
30
Conditions
Iq(OFF)
5.10
130
∆VOLOAD
Conditions
5.00
VIN=30V, Io=0.1A
VIN=30V, Io=3A
∆VOLINE
Iq
Quiescent Circuit Current
4.90
VIN=30V, Io=3A
fo
Is
1.02
max.
86
Conditions
Conditions
1.00
Unit
typ.
VIN=30V, Io=0.1A, Ta=0 to 100°C
Conditions
Conditions
Oscillation Frequency
mIN.
±0.1
η
Efficiency
max.
VIN=30V, Io=0.1A
Temperature Coefficient of Output Voltage ∆VO/∆T(∆VREF/∆T)
(Reference voltage temperature coefficient for SI-8010Y)
SI-8050Y
typ.
10
30
VIN=30V, EN/SS=0V
0.5
0.5
µA
µA
V
VIN=30V
VIN=30V
300
300
V/V
Error Amplifier Transformer Conductance
GEA
800
800
µA/V
Current Sense Amplifier Impedance
1/GCS
0.16
0.16
V/A
Maximum ON Duty
DMAX
92
92
%
Minimum ON Time
DMIN
200
200
nsec
*:R1=8kΩ, R2=2kΩ when Ta=25°C and Vo=5V
SI-8000Y
SI-8000Y
5 SS
5 SS
C6
Soft start
54
ICs
C6
Soft start
+VOUT. ON/OFF
