Liteon Semiconductor Corporation
LSP2115
300mA High Input Voltage Bipolar Linear Regulator
FEATURES
Maximum 28V input Voltage
1.4V maximum dropout at full load current
Fast transient response
Output current limiting
Built-in thermal shutdown
Good noise rejection
3-Terminal Adjustable or Fixed 1.8V,3.3V, 5.0V
GENERAL DESCRIPTION
The LSP2115 is a series of high input Voltage low
dropout three-terminal regulators with a dropout of
1.4V at 1A output current.
The LSP2115 series provides current limiting and
thermal shutdown. Its circuit includes a trimmed
bandgap reference to assure output voltage accuracy
to be within 2% for 1.8V, 3.3.V, 5.0V and adjustable
versions. Current limit is trimmed to ensure specified
output current and controlled short-circuit current.
On-chip thermal shutdown provides protection against
any combination of overload and ambient temperature
that would create excessive junction temperature.
The LSP2115 has an adjustable version that can
provide the output voltage from 1.25V to 24V with only
two external resistors.
The LSP2115 series is available in the industry
standard TO92-3L and SOT89-3L packages.
(2) SOT89-3L
APPLICATIONS
PC Motherboard
LCD Monitor
Graphic Card
DVD-video player
NIC/Switch
Telecom Equipment
ADSL Modem
Printer and other Peripheral Equipment
PIN CONFIGURATION
(1) TO92-3L
PIN DESCRIPTION
Pin Number
TO92-3L
2
1
3
SOT89-3L
2,TAB
1
3
Pin Name
VIN
GND
VOUT
Pin Function
Input
Ground
Output
BLOCK DIAGRAM
3 INPUT
For Adjustable Output, disconnect A1 and A2, connect B
For Fixed Output,connect A1 and A2, disconnect B
A1
B
A2
1 ADJ/GND
1/8
-
+
Thermal
Protection
2 OUTPUT
Rev1.0
Liteon Semiconductor Corporation
LSP2115
300mA High Input Voltage Bipolar Linear Regulator
ABSOLUTE MAXIMUM RATINGS (NOTE 1)
Symbol
Parameter
Rating
Unit
V
IN
Input Voltage
28
V
Output Current
Pd/ (V
IN
- V
OUT
)
Iout
mA
T
J
Maximum Junction Temperature
150
℃
T
S
Storage Temperature
-65~150
℃
T
LEAD
Lead Temperature (10 sec.)
300
℃
ESD
ESD (Machine Model)
600
V
Note 1: Stresses greater than those listed under“Absolute Maximum Ratings” may cause permanent damage to the
device. These are stress rating only, and functional operation of the device at these or any other conditions beyond
those indicated under “Recommended Operating Conditions” is not implied. Exposure to “Absolute Maximum
Ratings” for extended periods may affect device reliability.
RECOMMENDED OPERATING CONDITIONS
Symbol
V
IN
T
J
Parameter
Input Voltage
Operating Junction Temperature Range
Rating
24
-40~125
Unit
V
℃
ELECTRICAL CHARACTERISTICS
Operating Conditions: V
IN
≤10V,
T
J
=25
℃
, unless otherwise specified
Parameter
Reference
Voltage
Symbol
V
REF
LSP2115 -Adj
LSP2115 -1.8
Output Voltage
V
OUT
LSP2115 -3.3
LSP2115 -5.0
Line Regulation
Reg
LINE
LSP2115-XXX
LSP2115 -Adj
LSP2115 -1.8
LSP2115 -3.3
LSP2115 -5.0
LSP2115-XXX
LSP2115-XXX
LSP2115-XXX
LSP2115-XXX
Test Condition
I
O
=10mA, V
IN
-V
OUT
=1.5V
I
O
=10mA,1.5V≤V
IN
-V
OUT
≤8V
I
O
=10mA, V
IN
=3.3V
I
O
=10mA, 3.3V≤V
IN
≤10V
I
O
=10mA, V
IN
=4.8V
I
O
=10mA, 4.8V≤V
IN
≤10V
I
O
=10mA, V
IN
=6.5V
I
O
=10mA, 6.5V≤V
IN
≤12V
I
O
=10mA,1.5V≤V
IN
-V
OUT
≤7V
I
O
=10mA,1.5V≤V
IN
-V
OUT
≤10V
VIN= 3V, 10mA<Io<300mA
VIN= 3.3V, 10mA<Io<300mA
VIN= 5V, 10mA<Io<300mA
VIN= 6.5V, 10mA<Io<300mA
I
OUT
=
300mA ,∆V
OUT
=1%V
OUT
V
IN
-V
OUT
=3V
F=120Hz,C
OUT
=25uF
Tantalum, V
IN
-V
OUT
=3V
I
O
=10mA
Min.
1.225
1.225
1.782
1.764
3.267
3.235
4.950
4.900
Typ.
1.250
1.250
1.8
1.8
3.3
3.3
5.0
5.0
0.1
0.1
1
15
26
40
1.3
350
60
0.5
70
Max.
1.275
1.275
1.818
1.836
3.333
3.365
5.050
5.100
0.3
0.5
18
33
50
1.4
Unit
V
V
%
%
mV
mV
mV
V
mA
dB
%
Load Regulation
Reg
Load
Dropout Voltage
Current Limit
Ripple Rejection
Temperature
Stability
V
IN
- V
OUT
I
LIMT
2/8
Rev1.0
Liteon Semiconductor Corporation
LSP2115
300mA High Input Voltage Bipolar Linear Regulator
ELECTRICAL CHARACTERISTICS (CONTINUED)
Operating Conditions: V
IN
≤10V,
T
J
=25
℃
, unless otherwise specified
Parameter
Adjust Pin Current
Adjust Pin Current Change
Minimum Load Current(ADJ)
Quiescent Current
Long-term Stability
RMS Output Noise
(% of V
OUT
)
Power Dissipation
Thermal Resistance,
Junction to Ambient
Thermal Resistance,
Junction to case
Thermal Shutdown
Thermal Shutdown
Hysteresis
Iq
Symbol
Test Condition
I
O
=10mA~300mA, 1.5V≤V
IN
-V
OUT
≤10V
I
O
=10mA~300mA, 1.4V≤V
IN
-V
OUT
≤10V
LSP2115E
1.5V≤V
IN
-V
OUT
≤10V
LSP2115
V
IN
=V
OUT
+1.25V
T
A
=125℃, 1000hrs
T
A
=25℃, 10Hz≤f≤10kHz
Pd
θ
JA
θ
JC
TO92-3L
SOT89-3L
TO92-3L
SOT89-3L
TO92-3L
SOT89-3L
Junction Temperature
Min.
Typ.
60
0.2
1.7
5
5
0.3
0.003
625
600
220
180
60
45
150
25
Max.
120
5
5
10
10
Unit
µA
µA
mA
mA
mA
%
%
mW
℃/
W
℃/
W
℃
℃
TYPICAL APPLICATIONS
LSP2115-ADJ
Vin
10uF
+
Vin
ADJ
Vout
R1
+
Vout
10uF
R2
Vout=Vref*(1+R2/R1)+Iadj*R2
The LSP2115 keeps a constant 1.25V between the output pin and the adjust pin. By placing a resistor R1 across
these two pins a constant current flows through R1, adding to the Iadj current and into the R2 resistor producing a
voltage equal to the (1.25/R1)*R2+Iadj*R2 which will be added to the 1.25V to set the output voltage. This is
summarized in the above equation. Since the minimum load current requirement of the LSP2115 is 10mA, R1 is
typically selected to be 121Ω resistor so that it automatically satisfies the minimum current requirement. Notice that
since Iadj is typically in the range of 50uA it only adds a small error to the output voltage and should only be
considered when a very precise output voltage setting is required. For example, in a typical 3.3V application where
R1=121Ω and R2=200Ω the error due to Iadj is only 0.3% of the nominal set point.
Vin=7V
10uF
+
LSP2115-5.0
Vin
GND
Vout
5V at 300mA
+
10uF
3/8
Rev1.0
Liteon Semiconductor Corporation
LSP2115
300mA High Input Voltage Bipolar Linear Regulator
TYPICAL PERFORMANCE CHARACTERISTICS
1.2
Dropout Voltage (V)
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0.2
0.4
0.6
0.8
Output Current (A)
1.0
T
A
=125℃
Dropout Voltage vs Output Current
T
A
=0℃
T
A
=25℃
Reference Voltage vs Junction Temperature
1.280
1.275
Reference Voltage (V)
1.270
1.265
1.260
1.255
1.250
1.245
1.240
1.235
-50 -25
0
25
50
75 100 125
Junction Temperature (℃)
Adjust Pin Current vs Junction Temperature
90
Adjust Pin Current (µA)
-50
-25
0
25
50
75 100
Junction Temperature (℃)
125
5
Minimum Load Current (mA)
4
3
2
1
0
Minimum Load Current vs Junction Temperature
80
70
60
50
40
30
20
10
0
-50
-25
0
25
50
75 100 125
Junction Temperature (℃)
4/8
Rev1.0
Liteon Semiconductor Corporation
LSP2115
300mA High Input Voltage Bipolar Linear Regulator
TYPICAL PERFORMANCE CHARACTERISTICS (CONTINUED)
Line Transient Response
Ripple Rejection vs Frequency
70
Ripple Rejection (dB)
60
50
40
30
20
Load Transient Response
10
100
10k
1k
Frequency (Hz)
100k
5/8
Rev1.0
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