1-1-4 Linear Regulator ICs
SI-3000LSA Series
■Features
• Compact surface-mount package (SOP8)
• Output current: 1 A
Surface-Mount, Low Current Consumption, Low Dropout Voltage
■Absolute
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 Lead (pin 8))
Thermal Resistance (Junction to Ambient Air)
Symbol
V
IN
V
C
I
O
P
D1*1
P
D2*2
T
j*3
T
op
T
stg
Ratings
16
V
IN
1
1.16
1.1
–30 to +150
–30 to +150
–30 to +150
36
100
Unit
V
V
A
W
W
°C
°C
°C
°C/W
°C/W
(T
a
=25°C)
• Low circuit current at output OFF: Iq(OFF)
≤
1
µ
A (V
C
= 0 V)
• Low dropout voltage: V
DIF
≤0.8
V (at I
O
= 1 A)
V
DIF
≤1.2
V (I
O
= 1 A) for SI-3018LSA
• 4 types of output voltages (1.8 V, 2.5 V, 3.3 V,
5.0 V) available
• Output ON/OFF control terminal voltage
compatible with LS-TTL
• Built-in foldback-type-overcurrent and thermal
protection circuits
θ
j-L
θ
j-a *2
*1: When mounted on glass-epoxy board 56.5
×
56.5 mm (copper laminate area 100%).
*2: When mounted on glass-epoxy board 40
×
40 mm (copper laminate area 100%).
*3: Thermal protection circuits may be activated if the junction temperature exceeds 135°C.
■Applications
• Auxiliary power supplies for PC
• Battery-driven electronic equipment
■Recommended
Operating Conditions
Ratings
Parameter
DC Input Voltage Range
DC Output Current Range
Operating Junction Temperature
Operating Ambient Temperature
Symbol
V
IN
I
O
T
jop
T
aop
SI-3018LSA
3.1 to 3.5
*1
SI-3025LSA
*2
SI-3033LSA
*2
SI-3050LSA
*2
Unit
V
A
°C
°C
to 3.5
*1
0 to 1
to 5.2
*1
to 8.0
–20 to +125
–30 to +85
*1: V
IN
(max) and I
O
(max) are restricted by the relation P
D
= (V
IN
– V
O
)
×
I
O
.
Please calculate these values referring to the reference data on page 71.
*2: Refer to the Dropout Voltage parameter.
■Electrical
Characteristics
Ratings
Parameter
Symbol
min.
Output Voltage
V
O
Conditions
V
DIF
Dropout Voltage
Conditions
Conditions
Line Regulation
Load Regulation
Temperature Coefficient of
Output Voltage
Ripple Rejection
Quiescent Circuit Current
Circuit Current at Output OFF
Overcurrent Protection
Starting Current
*1,3
Control Voltage (Output ON)
*2
Control Voltage (Output OFF)
*2
V
C
Terminal
Control Current (Output ON)
Control Current (Output OFF)
∆V
LINE
Conditions
∆V
OLOAD
Conditions
∆V
O
/∆T
a
Conditions
R
REJ
Conditions
I
q
Conditions
I
q
(OFF)
Conditions
I
S1
Conditions
V
C
, IH
V
C
, IL
I
C
, IH
Conditions
I
C
, IL
Conditions
0
–5
0
–5
V
C
=0V
40
2.0
0.8
80
40
1.2
V
IN
=3.3V
2.0
0.8
80
V
C
=2V
0
–5
40
2
10
±0.3
V
IN
=3.3V, I
O
=5mA, T
j
=0 to 100°C
60
V
IN
=3.3V, f=100 to 120H
Z
1.7
V
IN
=3.3V, I
O
=0A
1
V
IN
=3.3V, I
O
=0A, V
C
=0V
1.2
V
IN
=3.3V
2.0
0.8
80
2.5
10
20
2
10
±0.3
V
IN
=3.3V, I
O
=5mA, T
j
=0 to 100°C
57
V
IN
=3.3V, f=100 to 120H
Z
1.7
V
IN
=3.3V, I
O
=0A
1
V
IN
=3.3V, I
O
=0A, V
C
=0V
1.2
V
IN
=5V
2.5
10
20
V
IN
=3.1 to 3.5V, I
O
=0.3A
V
IN
=3.3V, I
O
=0 to 1A
V
IN
=3.1 to 3.5V, I
O
=0.3A
V
IN
=3.3V, I
O
=0 to 1A
1.764
SI-3018LSA
typ.
1.800
–
–
0.6
1.2
I
O
≤0.5A
0.8
I
O
≤1A
3
10
±0.3
V
IN
=5V, I
O
=5mA, T
j
=0 to 100°C
55
V
IN
=5V, f=100 to 120H
Z
1.7
V
IN
=5V, I
O
=0A
1
V
IN
=5V, I
O
=0A, V
C
=0V
2.5
10
20
max.
1.836
min.
2.450
SI-3025LSA
typ.
2.500
max.
2.550
0.4
I
O
≤0.5A
0.8
min.
3.234
SI-3033LSA
typ.
3.300
max.
3.366
0.4
(T
a
=25°C, V
C
=2V, unless otherwise specified)
SI-3050LSA
min.
4.90
typ.
5.00
V
IN
=6V, I
O
=0.5A
0.4
I
O
≤
0.5A
0.8
3
10
±0.5
V
IN
=6V, I
O
=5mA, T
j
=0 to 100°C
55
V
IN
=6V, f=100 to 120H
Z
1.7
V
IN
=6V, I
O
=0A
1
V
IN
=6V, I
O
=0A, V
C
=0V
1.2
V
IN
=6V
2.0
0.8
40
0
80
–5
2.5
15
30
V
max.
5.10
V
Unit
V
IN
=3.3V, I
O
=0.5A
V
IN
=3.3V, I
O
=0.5A
V
IN
=5V, I
O
=0.5A
V
IN
=4.5 to 5.5V, I
O
=0.3A
V
IN
=5V, I
O
=0 to 1A
V
IN
=6 to 7V, I
O
=0.3A
V
IN
=6V, I
O
=0 to 1A
mV
mV
mV/
°C
dB
mA
µ
A
A
V
µ
A
µ
A
*1: Is
1
is specified at the 5% drop point of output voltage V
O
on the condition that V
IN
= 3.3 V (5 V for SI-3033LSA), and I
O
= 0.5 A.
*2: Output is OFF when the output control terminal VC is open. Each input level is equivalent to LS-TTL level. Therefore, the device can be driven directly by LS-TTLs.
*3: These products cannot be used in the following applications. Because these applications require a certain current at start-up and so 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
70
ICs
SI-3000LSA Series
■External
Dimensions (SOP8)
5.1
±0.4
1.27
0.4
±0.1
0.15
+0.1
–0.05
0.5
±0.1
(Unit : mm)
8
7
6
5
1
2
3
4
0.995max.
1.55
±0.15
1.5
±0.1
0
to
10
°
1.27
Pin Assignment
q
V
IN
w
NC (Leave open)
e
V
IN
r
V
C
t
GND
y
GND
u
V
O
i
V
O
Plastic Mold Package Type
Flammability: UL94V-0
Product Mass: Approx. 0.1g
0.10
0.4
±0.1
0.12 M
■Block
Diagram
V
IN
1
8
V
O
0.05
±0.05
4.4
±0.2
NC 2
+
–
7 V
O
V
IN
3
TSD
6
6.2
±0.3
GND
V
C
4
5
GND
■Typical
Connection Diagram
V
IN
C
IN
1
2
3
4
V
IN
GND
V
C
C
O
8
7
6
5
V
O
■Reference
Data
PCB Copper Laminate Area vs. Junction to
Ambient Air Thermal Resistance
Allowable Output Current
(vs. V
IN
-V
OUT
Voltage Difference)
V
IN
-I
O
max
1.2
150
140
130
PCB (glass-epoxy, 40×40mm)
160mm (40×40) mm
1.0
Load
+
+
C
O
: Output capacitor (22
µ
F or larger)
C
IN
: Input capacitor (10
µ
F)
This capacitor is required in the case of an inductive input line or long
wiring.
Tantalum capacitors are recommended for C
IN
and C
O
, particularly at
low temperatures.
* Leave pin 2 open.
T
j
= 120°C (20% derating of 150°C)
0.8
I
out (
max) (A)
θ
j-a
(°C/W)
120
110
100
90
θ
j-a
=100°C/W
0.6
The inner frame stage, on which the PTr is mounted,
is directly connected to the V
OUT
pin.
Therefore, enlarging the copper laminate area
around the V
OUT
pin is really effective for a heat
radiation.
0.4
T
a
=25°C
T
a
=85°C
0.2
80
70
100
0
1000
5000
1
2
3
4
Copper Laminate Area (mm
2
)
V
IN
-V
OUT
Voltage Difference (V)
ICs
71
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