1-1-4 Linear Regulator ICs
SI-3000KS Series
Surface-Mount, Low Current Consumption, Low Dropout Voltage
■Features
• Compact surface-mount package (SOP8)
• Output current: 1.0 A
• Compatible with low ESR capacitor
• Low circuit current at output OFF Iq
≤
350
µ
A
(I
O
= 0 A, V
C
= 2 V)
• Low current consumption Iq (OFF)
≤
1
µ
A
(V
C
= 0 V)
• Low dropout voltage V
DIF
≤
0.6 V (I
O
= 1 A)
• 3 types of output voltages (2.5 V, 3.3 V, and
variable type) available
• Output ON/OFF control terminal voltage
compatible with LS-TTL
• Built-in drooping-type-overcurrent and thermal
protection circuits
■Absolute
Maximum Ratings
Parameter
DC Input Voltage
Output Control Terminal Voltage
DC Output Current
Power Dissipation
Junction Temperature
Storage Temperature
Thermal Resistance (Junction to Ambient Air)
Thermal resistance (Junction to Lead (pin 7))
Symbol
V
IN*1
V
C
I
O*1
P
D*1, *2
T
j
T
stg
Ratings
17
V
IN
1.0
0.76
–40 to +125
–40 to +125
130
22
Unit
V
V
A
W
°C
°C
°C/W
°C/W
(T
a
=25°C)
θ
j-a
θ
j-L
*1: V
IN
(max) and I
O
(max) are restricted by the relation PD = (V
IN
- V
O
)
×
I
O
. Please calculate these values referring to the
Copper laminate area vs. Power dissipation data as shown hereinafter.
*2: When mounted on a glass epoxy board of 1600 mm
2
(copper laminate area 2%).
■Applications
• Local power supplies
• Battery-driven electronic equipment
■Electrical
Characteristics
Ratings
Parameter
Input Voltage
Output Voltage
(Reference voltage V
ADJ
for SI-3012KS)
Symbol
V
IN
V
O
(V
ADJ
)
Conditions
V
DIF
Dropout Voltage
Conditions
Conditions
Line Regulation
Load Regulation
Quiescent Circuit Current
Circuit Current at Output OFF
Temperature Coefficient of
Output Voltage
Ripple Rejection
Overcurrent Protection
Starting Current
*2
Control Voltage (Output ON)
*3
Control Voltage (Output OFF)
V
C
Terminal
Control Current (Output ON)
Control Current (Output OFF)
∆V
OLINE
Conditions
∆V
OLOAD
Conditions
I
q
Conditions
I
q
(OFF)
Conditions
∆V
O
/∆T
a
Conditions
R
REJ
Conditions
I
S1
Conditions
V
C
, IH
V
C
, IL
I
C
, IH
Conditions
I
C
, IL
Conditions
–5
0
–5
2.0
0.8
40
V
C
=2V
0
V
C
=0V
–5
1.2
V
IN
=3.3V (V
O
=2.5V)
2.0
0.8
40
V
IN
=3.3V, V
C
=0V
±0.3
T
j
=0 to 100°C (V
O
=2.5V)
55
V
IN
=3.3V, f=100 to 120H
Z
(V
O
=2.5V)
1.2
V
IN
=3.3V
2.0
I
O
=0.5A (V
O
=2.5V)
0.6
I
O
=1A (V
O
=2.5V)
10
V
IN
=3.3 to 8V, I
O
=10mA (V
O
=2.5V)
40
V
IN
=3.3V, I
O
=0 to 1A (V
O
=2.5V)
350
V
IN
=3.3V, I
O
=0A, V
C
=2V, R2=24kΩ
1
V
IN
=3.3V, V
C
=0V
±0.3
T
j
=0 to 100°C
55
V
IN
=3.3V, f=100 to 120H
Z
1.2
V
IN
=3.3V, I
O
=0A, V
C
=2V
1
V
IN
=3.3V, I
O
=0 to 1A
350
V
IN
=3.3 to 8V, I
O
=10mA
40
I
O
=1A
10
SI-3012KS (variable type)
min.
2.4
1.24
1.28
V
IN
=3.3V, I
O
=10mA
0.3
I
O
=0.5A
0.6
1.32
typ.
max.
min.
*1
(T
a
=25°C, V
c
=2 V, unless otherwise specified)
SI-3025KS
typ.
2.50
V
IN
=3.3V, I
O
=10mA
0.4
I
O
=0.5A
0.6
I
O
=1A
15
V
IN
=5 to 10V, I
O
=10mA
50
V
IN
=5V, I
O
=0 to 1A
350
V
IN
=5V, I
O
=0A, V
C
=2V
1
V
IN
=5V, V
C
=0V
±0.3
T
j
=0 to 100°C
55
V
IN
=5V, f=100 to 120H
Z
V
IN
=5V
0.8
40
0
mV
mV
max.
2.55
min.
*1
SI-3033KS
typ.
3.300
V
IN
=5V, I
O
=10mA
0.4
max.
Unit
V
3.366
V
2.45
3.234
V
µ
A
µ
A
mV/
°C
dB
A
V
µ
A
µ
A
*1: Refer to the Dropout Voltage parameter.
*2: The I
s1
is specified at the 5% drop point of output voltage V
O
on the condition that V
IN
= V
O
+ 1 V, and I
O
= 10 mA.
*3: Output is OFF when the 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.
72
ICs
SI-3000KS Series
■External
Dimensions (SOP8)
5.1
±0.4
1.27
0.4
±0.1
0.15
+0.1
–0.05
(Unit : mm)
Pin Assignment
q
V
C
w
V
IN
e
V
O
r
Sence (ADJ for SI-3012KS)
t
GND
y
GND
u
GND
i
GND
Plastic Mold Package Type
Flammability: UL 94V-0
Product Mass: Approx. 0.1 g
8
7
6
5
0.5
±0.1
4.4
±0.2
0.05
±0.05
1.55
±0.15
1.5
±0.1
0
to
10
°
1
2
3
4
1.27
0.995max.
0.10
0.4
±0.1
0.12 M
■Block
Diagram
●SI-3012KS
●SI-3025KS,
SI-3033KS
V
IN
2
3 V
O
V
IN
2
3 V
O
6.2
±0.3
4
V
C
1
-
+
4 ADJ
TSD
8
7
REF
6
5 GND
V
C
1
-
+
Sense
TSD
8
7
REF
6
5 GND
■Typical
Connection Diagram
●SI-3012KS
V
IN
2
C
IN
V
O
3
●SI-3025KS,
SI-3033KS
V
IN
2
V
O
3
C
O
R1
C
O
V
C
GND ADJ
1
4
5 to 8
Load
C
IN
sense
V
C
GND 4
1
5 to 8
Load
R2
R2
R
1
, R
2
: Output voltage setting resistors
The output voltage can be set by connecting R
1
and R
2
as shown above.
The recommended value of R
2
is 24 kΩ .
C
IN
: Input capacitor (22
µ
F or larger)
C
O
: Output capacitor (22
µ
F or larger)
For SI-3000KS series, Co has to be a low ESR capacitor.
When using the electrolytic capacitor, the SI-3000KS series may oscillate at a low temperature.
R1=(V
O
–V
ADJ
)
÷
(V
ADJ
/R2)
■Reference
Data
Copper Laminate Area vs.
Thermal Resistance
140
Area of PC board : 40×40mm
1.2
Copper Laminate Area vs.
Power Dissipation
Tj=100°C Area of PC board : 40×40mm
Ta=25°C
Thermal resistance
θ
j-a (°C/W)
120
Power dissipation P
D
(W)
1
Ta=50°C
Ta=80°C
0.8
100
• Obtaining the junction temperature
Measure the temperature T
L
at the lead part of the GND
pin (pin 7) with a thermocouple, etc. Then, substitute
this value in the following formula to obtain the junction
temperature.
0.6
0.4
T
j
=P
D
×
θ
j–L
+ T
L
(
θ
j–L
= 22
°
C/W)
80
60
0.2
40
10
100
Copper laminate area (mm
2
)
(GND terminal)
1000
0
10
100
Copper laminate area (mm
2
)
(GND terminal)
1000
ICs
73
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