SI-3025KS-TL [SANKEN]
Regulator;
SANKEN ELECTRIC 
●SI-3000B Series
SI-3000B Series
5-Terminal, Multi-Function, Full-Mold, Low Dropout Voltage Dropper Type
■Features
• Compact full-mold package (equivalent to TO220)
• Output current: 0.27A
• Low dropout voltage: VDIF≤0.5V (at IO=0.27A)
• Output ON/OFF control terminal is compatible with LS-TTL. (It may be directly
driven by LS-TTL or standard CMOS logic.)
• Built-in foldback overcurrent, thermal protection circuits
• Highly accurate overcurent protection starting current
SI-3157B : 0.3 to 0.7A (VIN=18V)
SI-3025B : 0.3 to 0.7A (When VIN=18V, setting VO=15.7V)
0.3 to 0.75A (When VIN=18V, setting VO=11.7V)
• Variable output voltage type (SI-3025B) also available
■Applications
• For BS and CS antenna power supplies
• Electronic equipment
■Absolute Maximum Ratings
(Ta=25°C)
Paarameter
DC Input Voltage
Symbol
VIN
Ratings
Unit
V
35
Voltage of Output Control Terminal
DC Output Current
VC
VIN
0.27*1
V
IO
A
PD1
PD2
Tj
14(With infinite heatsink)
W
Power Dissipation
1.5(Without heatsink, stand-alone operation)
W
Junction Temperature
–40 to +125
°C
Ambient Operating Temperature
Storage Temperature
Top
–30 to +100
°C
Tstg
Rth(j-c)
Rth(j-a)
–40 to +125
°C
Thermal Resistance (junction to case)
Thermal Resistance (junction to ambient air)
7.0
°C/W
°C/W
66.7(Without heatsink, stand-alone operation)
28
●SI-3000B Series
■Electrical Characteristics
(Ta=25°C unless otherwise specified)
Ratings
Parameter
Symbol
SI-3157B
typ.
SI-3025B
Unit
V
min.
max.
27*1
min.
6*2,6
typ.
max.
27*1
*2
Input Voltage
Output Voltage
(SI-3025B: Reference
Voltage)
VIN
VO
14.92
15.70
16.48
2.448
2.550
2.652
(VREF)
V
Conditions
VDIF
VIN=18V, IO=0.2A
VIN=VO+3V, IO=0.2A
0.5
90
0.5
10
Dropout Voltage
Line Regulation
Load Regulation
V
Conditions
∆VOLINE
Conditions
∆VOLOAD
Conditions
∆VO/∆Ta
IO≤0.27A
IO≤0.27A
mV
(3025B:
mV/V)
30
VIN=17 to 27V, IO=0.2A
120
VIN=(VO+1) to 27V, IO=0.27A
mV
(3025B:
mV/V)
300
10
VIN=18V, IO=0 to 0.27A
VIN=VO+3V, IO=0 to 0.27A
Temperature Coefficient of Output
Voltage (SI-3025B: Temperature
Coefficient of Reference Voltage)
±1.5
±0.5
(
∆VREF/∆T
a)
mV/°C
Conditions
RREJ
VIN=18V, IO=5mA, Tj=0 to 100°C
54
VIN=VO+3V, IO=5mA, Tj=0 to 100°C
54
Ripple Rejection
dB
Conditions
Iq
VIN=18V, f=100 to 120HZ
VIN=VO+3V, f=100 to 120HZ
Quiescent Circuit
Current
3
10
3
10
mA
Conditions
IS1
VIN=18V, IO=0A
VIN=VO+3V, IO=0A
0.3
2.0
0.7
0.3
0.75
Overcurrent Protection
Starting Current*3,4
Conditions
VIN=18V
When VIN=18V, setting VO=11.7V
0.3 0.7
When VIN=18V, setting VO=15.7V
2.0
A
Conditions
VC. IH
Control Voltage (Output ON)
Control Voltage (Output OFF)
V
VC. IL
0.8
20
0.8
VC
Control Current
IC. IH
20
µA
mA
*5
Terminal (Output ON)
Control Current
Conditions
IC. IL
VC=2.7V
VC=0.4V
VC=2.7V
VC=0.4V
–0.3
–0.3
(Output OFF)
Conditions
*1: VIN(max) and IO(max) are restricted by the relation PD(max)=(VIN-VO)•IO=14(W).
*2: Refer to the dropout voltage.(Refer to Setting DC Input Voltage on page 7.)
*3: IS1 is specified at –5(%) drop point of output voltage VO on the condition that VIN=VO+3V, IO=0.2A.
*4: A foldback type overcurrent protection circuit is built into the IC regulator. Therefore, avoid using it for the following applications as it may cause
starting errors:
(1) Constant current load (2) Plus/minus power (3) Series power (4) VO adjustment by raising ground voltage
*5: Output is ON even when output control terminal VC is open. Each input level is equivalent to LS-TTL. Therefore, it may be directly driven by an
LS-TTL circuit.
*6. When setting output voltage to 5V or less, input voltage needs to be set to 6V or over to operate stably.
29
●SI-3000B Series
■Outline Drawing
(unit:mm)
φ3.2±0.2
4.2±0.2
2.8±0.2
10.0±0.2
Part Number
Lot Number
Plastic Mold Package Type
Flammability: UL94V-0
Weight: Approx. 2.3g
2.6±0.1
0.95±0.15
SI-3157B
SI-3025B
+0.2
–0.1
0.85
q GND
w VC
q GND
w VC
+0.2
–0.1
0.45
e VO
e VO
P1.7±0.7×4=6.8±0.7
3.9±0.7
(4.3)
8.2±0.7
r VOS
t VIN
r VREF
t VIN
Forming No. 1101
1
2 3 4 5
■Block Diagram
SI-3157B
SI-3025B
T
r1
Tr1
5
3
4
5
3
4
MIC
MIC
2
2
Equivalent
to LS-TTL
Equivalent
to LS-TTL
1
1
30
●SI-3000B Series
■Standard External Circuit
SI-3157B
D1
2
*
C0 : Output capacitor (47 to 100µF)
*1C1 : Oscillation prevention capacitor
5
3
4
C2
(C1: Approx. 47µF, C2: 0.33µF)
SI-3157B
1
OPEN
1
*
2
+
+
These capacitors are required if the input line is inductive
and in the case of long wiring. Tantalum capacitors are rec-
ommended for C1 and C0, particularly at low temperatures.
DC Input
C0
DC Output
C2
C1
VIN
VO
*2D1 : Protection diode
This diode is required for protection against reverse biasing
of the input and output. Sanken EU2Z is recommended.
*3R1 : External resistor for setting output voltage
R2 Relationship between output voltage VO and external resis-
tors R1 and R2 is as follows.
SI-3025B
D1
2
*
R1
VO=VREF • 1+
(VREF=2.55V(typ.))
5
2
3
4
R2
SI-3025B
1
R1
*
R2
OPEN
C2
1
*
+
+
3
R2 must be 2.55kΩ for stable operation.
DC Input
VIN
C0
DC Output
VO
C1
3
*
■Ta-PD Characteristics
15
Infinite heatsink
With Silicon Grease
Heatsink: Aluminum
10
5
0
Without heatsink
–30
0
25
50
75
100
Ambient Temperature Ta (°C)
PD=IO•[VIN(mean)–VO]
31
●SI-3000B Series
■Typical Characteristics (When setting VO=15.7V for SI3025B)
(Ta=25°C)
IO vs.VDIF Characteristics
Temperature Coefficient of Output Voltage(SI-3157B)
Rise Characteristics(SI-3157B)
20
0.5
0.4
0.3
0.2
0.1
0
16.0
VIN=18V
lO=0A
15.9
15.8
15.7
15.6
15.5
15.4
15.3
15
10
5
lO
=0A
0.1A
0.2A
0.27A
0
0
5
10
15
20
25
30
0
0.05
0.1
0.15
0.2
0.25
0.3
28
4
–40 –20
0
20 40 60 80 100 120 140
Input Voltage VIN (V)
Output Current I
O
(A)
Ambient Temperature TC (°C)
Line Regulation
Load Regulation
Overcurrent Protection Characteristics(SI-3157B)
20
16.1
15.9
15.7
15.5
15.3
15.1
14.9
16.1
15.9
15.7
15.5
15.3
15.1
14.9
lO
=0A
0.1A
0.2A
15
10
5
V
IN=27V
25V
25V
18V
22V
22V
18V
16.5V
0
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
14
16
18
20
22
24
26
0
0.05
0.1
0.15
0.2
0.25
0.3
Output Current IO (A)
Input Voltage VIN (V)
Output Current I
O
(A)
Output ON/OFF Control
Thermal Protection Characteristics
20
20
15
10
5
VIN=18V
lO=0A
15
10
5
VIN=18V
lO=10mA
0
0
0
20 40 60 80 100 120 140 160 180
Case Temperature TC (°C)
0
1
2
3
Output ON/OFF Control VC (V)
Note on Thermal Protection:
The thermal protection circuit is intended for pro-
tection against heat during instantaneous short-
circuiting. Its operation is not guaranteed for short-
circuiting over extended periods of time.
32
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