1-1-1 Linear Regulator ICs
SI-3000B Series
5-Terminal, Full-Mold, Low Dropout Voltage Linear Regulator ICs
sFeatures
• Compact full-mold package (equivalent to
TO220)
• Output current: 0.27A
• Low dropout voltage: V
DIF
0.5V (at I
O
=0.27A)
• Output ON/OFF control terminal is compatible
with LS-TTL. (It can be driven directly by LS-TTL
or standard CMOS logic.)
• Built-in foldback overcurrent and thermal
protection circuits
• Accuracy of overcurrent protection starting
current
SI-3157B : 0.3 to 0.7A (V
IN
=18V)
SI-3025B : 0.3 to 0.7A
(When V
IN
=18V, at V
O
=15.7V)
0.3 to 0.75A
(When V
IN
=18V, at V
O
=11.7V)
• Variable output voltage type (SI-3025B) also
available
sAbsolute
Maximum Ratings
Parameter
DC Input Voltage
Output Control Terminal Voltage
DC Output Current
Power Dissipation
Junction Temperature
Operating Ambient Temperature
Storage Temperature
Thermal Resistance (junction to case)
Thermal Resistance (junction to ambient air)
Symbo
V
IN
V
C
I
O
P
D1
P
D2
T
j
T
OP
T
stg
Ratings
35
V
IN
0.27
*1
14(With infinite heatsink)
1.5(Without heatsink, stand-alone operation)
–40 to +125
–30 to +100
–40 to +125
7.0
66.7(Without heatsink, stand-alone operation)
Unit
V
V
A
W
W
°C
°C
°C
°C/W
°C/W
(T
a
=25°C)
θ
j-c
θ
j-a
sApplications
• For BS and CS antenna power supplies
• Electronic equipment
sElectrical
Characteristics
Ratings
Parameter
Input Voltage
Output Voltage
(Reference Voltage V
ADJ
for
SI-3025B)
Dropout Voltage
Line Regulation
Load Regulation
Temperature Coefficient of Output
Voltage (SI-3025B: Temperature
Coefficient of Reference Voltage)
Ripple Rejection
Quiescent Circuit Current
Symbol
min.
V
IN
V
O
(V
ADJ
)
Conditions
V
DIF
Conditions
∆V
OLINE
Conditions
∆V
OLOAD
Conditions
∆V
O
/∆T
a
(∆V
ADJ
/∆T
a
)
Conditions
R
REJ
Conditions
I
q
Conditions
I
S1
Overcurrent Protection
Starting Current
*3,4
Control Voltage (Output ON)
Control Voltage (Output OFF)
V
C
Terminal
*5
Control Current
(Output ON)
Control Current
(Output OFF)
Conditions
Conditions
V
C.
IH
V
C.
IL
I
C.
IH
Conditions
I
C.
IL
Conditions
V
C
=0.4V
V
C
=2.7V
–0.3
V
C
=0.4V
2.0
0.8
20
V
C
=2.7V
2.0
0.3
V
IN
=18V
0.3
I
O
≤0.27A
30
V
IN
=17 to 27V, I
O
=0.2A
120
V
IN
=18V, I
O
=0 to 0.27A
±1.5
V
IN
=18V, I
O
=5mA, T
j
=0 to 100°C
54
V
IN
=18V, f=100 to 120H
Z
3
V
IN
=18V, I
O
=0A
0.7
0.3
10
300
90
*2
(T
a
=25°C unless otherwise specified)
SI-3157B
typ.
max.
27
*1
min.
6
*2,6
2.448
SI-3025B
typ.
Unit
max.
27
*1
V
V
14.92
15.70
V
IN
=18V, I
O
=0.2A
16.48
2.550
V
IN
=V
O
+3V, I
O
=0.2A
2.652
0.5
I
O
≤0.27A
0.5
V
10
V
IN
=(V
O
+1) to 27V, I
O
=0.27A
10
V
IN
=V
O
+3V, I
O
=0 to 0.27A
±0.5
V
IN
=V
O
+3V, I
O
=5mA, T
j
=0 to 100°C
54
V
IN
=V
O
+3V, f=100 to 120H
Z
3
V
IN
=V
O
+3V, I
O
=0A
0.75
V
IN
=18V, at V
O
=11.7V
0.7
V
IN
=18V, at V
O
=15.7V
0.8
20
–0.3
mA
V
A
10
mA
dB
mV
(SI-3025B:mV/V)
mV
(SI-3025B:mV/V)
mV/°C
µ
A
V
IN(max)
and I
O(max)
are restricted by the relation P
D(max)
=(V
IN
-V
O
)•I
O
=14(W).
Refer to the Dropout Voltage parameter. (Refer to Setting DC Input Voltage on page 7.)
I
S
1 is specified at the 5% drop point of output voltage V
O
on the condition that V
IN
=V
O
+3V, I
O
=0.2A.
These products cannot be used in the following applications because the built-in foldback-type overcurrent protection may cause errors during start-up stage.
(1) Constant current load (2) Positive and negative power supply (3) Series-connected power supply (4) V
O
adjustment by raising ground voltage
*5: Output is ON even when output control terminal V
C
is open. Each input level is equivalent to LS-TTL level. Therefore, the device can be driven directly by LS-TTLs.
*6: When setting output voltage to 5V or lower, input voltage needs to be set to 6V or higher to operate stably.
*1:
*2:
*3:
*4:
26
ICs
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