SE2138
1.5A CMOS
Elektronische Bauelemente
RoHS Compliant Product
Low Dropout Voltage Regulator
Description
The SE2138 positive,linear regulators feature low quiescent
current (45µA typ.) with low dropout voltage, making them ideal
for battery applications.These rugged devices have both Thermal
Shutdown and Current Fold-back to prevent device failure under
the "Worst" of operating conditions.The SE2138 is stable with an
output capacitance of 4.7µF or greater.
Features
*
Low Temperature Coefficient
*
Over-Temperature Shutdown
REF.
A
b
c
D
E
L4
L5
Millimeter
Min.
Max.
4.40
4.80
0.76
1.00
0.36
0.50
8.60
9.00
9.80
10.4
14.7
15.3
6.20
6.60
REF.
c1
b1
L
e
L1
Ø
A1
Millimeter
Min.
Max.
1.25
1.45
1.17
1.47
13.25
14.25
2.54 REF.
2.60
2.89
3.71
3.96
2.60
2.80
* Very Low Dropout Voltage
* High Accurate
±
1.5%
* Short Circuit Current Fold-back
* Guaranteed 1.5A output
* Current Limiting
Applications
*
PC Peripherals
*
Wireless Devices
* Portable Electronics
* Battery Powered Widgets
* Instrumentation
Functional Block Diagram
Typical Circuit
SE2138
Ordering Information(contd.)
Part Number
SE2138-15
SE2138-19
SE2138-33
SE2138-50
http://www.SeCoSGmbH.com/
Marking
8T152
XXXX
8T192
XXXX
8T332
XXXX
8T502
XXXX
Output Voltage
1.5V
1.9V
3.3V
5.0V
Part Number
SE2138-18
SE2138-25
SE2138-47
Marking
8T182
XXXX
8T252
XXXX
8T472
XXXX
Output Voltage
1.8V
2.5V
4.7V
Any changing of specification will not be informed individual
01-Jun-2002 Rev. A
Page 1 of
5
SE2138
Elektronische Bauelemente
1.5A CMOS
Low Dropout Voltage Regulator
Absolute Maximum Ratings
Parameter
Input Max Voltage
Output Current
Output Voltage
Operating Ambient Temperature
Junction Temperature
Maximum Junction Temperature
Thermal Resistance
Internal Power Dissipation
EDS Classification
*Measure jc on backside center of tab.
Symbol
V
IN
I
OUT
V
OUT
Topr
Tj
Tj
Max
jc
(Non-Conductive Epoxy)
*
ja
PD
Ratings
8
P
D
/( V
IN-
V
O)
1.5~5.0
-40 ~ +85
-40 ~ +125
150
24
80
1.6
B
Unit
V
A
V
:
:
:
: /W
: /W
W
Electrical Characteristics
V
IN
=V
OUT
(T)+2V, Ta=25 : unless otherwise noted
Parameter
Output Voltage
Output Current
Current Limit
Load Regulation
Dropout Voltage
Quiescent Current
Ground Pin Current
Line Regulation
Input Voltage
Over Temperature Shutdown
Over Temperature Hysterisis
Symbol
V
OUT
(E)
(Note1)
Condition
I
O
=1mA
V
O
>1.2V
V
O
>1.2V
V
IN
=V
OUT
(T)+2V,
I
O
=1mA to 1.5A
I
O
=1.5A
V
O
=V
OUT
(E)-2%
1.4V<V
OUT
(T) 2.0V
2.0V<V
OUT
(T) 2.8V
2.8V<V
OUT
(T)
Min
-1.5%
1.5
1.5
-1
-
-
-
-
-
-0.15
-0.1
-0.4
Note3
-
-
-
TYP
V
OUT
(T)
(Note2)
Max
1.5%
-
-
1
1300
800
600
70
-
0.15
0.1
0.4
7
-
-
-
-
-
-
-
-
Unit
V
A
A
%
mV
A
A
%
V
:
:
ppm/ :
mA
dB
Vrms
I
O
I
LIM
REG
LOAD
V
DROPOUT
I
Q
I
GND
REG
LINE
V
IN
OTS
OTH
TC
I
SC
PSRR
eN
-
2.0
0.2
-
-
-
45
45
-
0.02
-
-
150
30
30
750
70
50
20
30
V
IN
= V
OUT
(T)+2V,
I
O
=0mA
V
IN
= V
OUT
(T)+2V,
I
O
=1mA~1.5A
I
O
=1mA
V
IN
=V
OUT
V
OUT
(T)+2
V
OUT
(T)<2.0V
2.0V V
OUT
(T)<4.0V
4.0V V
OUT
(T)
Output Voltage
Temperature Coefficient
Short Circuit Current
Power Supply Rejection
Output Voltage Noise
V
IN
=V
OUT
(T)+1V, V
OUT
<0.4V
Io=100mA
Co=4.7 F
f=100Hz
f=1kHz
f=10kHz
-
-
-
-
-
f=10Hz~100kHz,
Io=10mA,
Co=4.7 F
Note 1: V
OUT
(E) =Effective Output Voltage (i.e. the output voltage when “V
OUT
(T) + 2.0V” is provided at the V
IN
pin while maintaining a
certain I
OUT
value).
2: V
OUT
(T) =Specified Output Voltage
3: V
IN (MIN)
=V
OUT
+V
DROPOUT
http://www.SeCoSGmbH.com/
Any changing of specification will not be informed individual
01-Jun-2002 Rev. A
Page
2
of
5
SE2138
Elektronische Bauelemente
1.5A CMOS
Low Dropout Voltage Regulator
Detailed Description
The SE2138 of COMS regulators contain a PMOS pass transistor,voltage reference, error amplifier,over-current protection and thermal
shutdown.The P-channel pass transistor receives data from the error amplifier, over-current shutdown, and thermal protection circuits.
During normal operation, the error
amplifier compares the output voltage to a precision reference. Over-current and Thermal shutdown circuits
o
become active when the junction temperature exceeds150 C, or the current exceeds 2.2A. During thermal shutdown, the output voltage
remains low. Normal operation is restored when the junction temperature drops below 120
o
C.The SE2138 behaves like a current
source when the load reaches 2.2A. However, if the load impedance drops below 0.3
Ω
, the current drops back to 600mA to prevent
excessive power dissipation. Normal operation is restored when the load resistance exceeds of 0.75
Ω
.
External Capacitors
The SE2138 is stable with an output capacitance to ground of 4.7uF or greater. Ceramic capacitors have the lowest ESR, and will
offer the best AC performance. Conversely, Aluminum Electrolytic capacitors exhibit the highest ESR, resulting in the poorest AC
response. Unfortunately, large value ceramic capacitors are comparatively expensive. One option is to parallel a 0.1uF ceramic
capacitor with a 10uF Aluminum Electrolytic. The benefit is low ESR, high capacitance, and low overall cost. A second capacitor is
recommended between the input and ground to stabilize V
IN.
The input capacitor should be at least 0.1uF to have a beneficial
effect. All capacitors should be placed in closed proximity to the pins. A "Quiet" ground termination is desirable. This can be
achieved with a "Star" connection.
Characteristics Curve
(T)+1 to
h tp://www.SeCoSGmbH.com/
Any changing of specification will not be informed individual
01-Jun-2002 Rev. A
Page
3
of
5
SE2138
Elektronische Bauelemente
1.5A CMOS
Low Dropout Voltage Regulator
http://www.SeCoSGmbH.com/
Any changing of specification will not be informed individual
01-Jun-2002 Rev. A
Page
5
of
5
SE2138
Elektronische Bauelemente
1.5A CMOS
Low Dropout Voltage Regulator
http://www.SeCoSGmbH.com/
Any changing of specification will not be informed individual
01-Jun-2002 Rev. A
Page
5
of
5
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