SE2138 [SECOS]
Low Dropout Voltage Regulator; 低压差稳压器
| 型号： | SE2138 |
| 厂家： | 
SECOS HALBLEITERTECHNOLOGIE GMBH |
| 描述： | Low Dropout Voltage Regulator |
| 文件： | 总5页 (文件大小：927K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SE2138
1.5A CMOS
Elektronische Bauelemente
Low Dropout Voltage Regulator
RoHS Compliant Product
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
with an
The SE2138 is stable
the "Worst" of operating conditions.
output capacitance of 4.7µF or greater.
Features
* Low Temperature Coefficient
* Over-Temperature Shutdown
* Very Low Dropout Voltage
* High Accurate 1.5%
Millimeter
Millimeter
REF.
REF.
Min.
Max.
4.80
1.00
0.50
9.00
10.4
15.3
Min.
1.25
Max.
1.45
A
b
c
D
E
L4
4.40
0.76
0.36
8.60
9.80
14.7
c1
b1
L
e
L1
Ø
1.17
1.47
13.25
14.25
2.54 REF.
* Short Circuit Current Fold-back
* Guaranteed 1.5A output
* Current Limiting
2.60
3.71
2.89
3.96
L5
6.20
6.60
A1
2.60
2.80
Applications
* PC Peripherals
* Wireless Devices
* Portable Electronics
* Battery Powered Widgets
* Instrumentation
Functional Block Diagram
Typical Circuit
SE2138
Ordering Information(contd.)
Marking
Part Number
Output Voltage
Marking
Part Number
Output Voltage
8T152
XXXX
8T192
XXXX
8T332
XXXX
8T502
XXXX
8T182
XXXX
8T252
XXXX
8T472
XXXX
SE2138-15
SE2138-19
SE2138-33
SE2138-50
1.8V
1.5V
1.9V
3.3V
5.0V
SE2138-18
SE2138-25
SE2138-47
2.5V
4.7V
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Any changing of specification will not be informed individual
01-Jun-2002 Rev. A
Page 1 of 5
SE2138
1.5A CMOS
Elektronische Bauelemente
Low Dropout Voltage Regulator
Absolute Maximum Ratings
Parameter
Symbol
Ratings
Unit
V
Input Max Voltage
VIN
8
PD/( VIN- VO)
1.5~5.0
-40 ~ +85
-40 ~ +125
150
Output Current
IOUT
A
Output Voltage
VOUT
V
Operating Ambient Temperature
Junction Temperature
Maximum Junction Temperature
Topr
к
Tj
к
Tj Max
к
ꢀjc (Non-Conductive Epoxy)*
24
к/W
к/W
W
Thermal Resistance
ꢀja
80
Internal Power Dissipation
EDS Classification
PD
1.6
B
*Measure ꢀjc on backside center of tab.
Electrical Characteristics VIN=VOUT(T)+2V, Ta=25к unless otherwise noted
Parameter
Symbol
Condition
Min
TYP
Max
Unit
V
OUT(T)
VOUT(E)
(Note1)
IO=1mA
-1.5%
1.5%
V
Output Voltage
(Note2)
V
O
>1.2V
1.5
-
2.0
0.2
-
-
-
A
A
IO
ILIM
Output Current
Current Limit
VO
>1.2V
1.5
V
IN=VOUT(T)+2V, I
O=1mA to 1.5A
-1
1
%
Load Regulation
REGLOAD
1.4V<VOUT(T)≤2.0V
2.0V<VOUT(T)≤2.8V
2.8V<VOUT(T)
-
1300
800
600
70
-
I
O
=1.5A
mV
Dropout Voltage
VDROPOUT
-
-
V
O
=VOUT(E)-2%
-
-
V
IN= VOUT(T)+2V, I
O=0mA
-
-
45
45
-
ꢁA
ꢁA
IQ
Quiescent Current
Ground Pin Current
V
IN= VOUT(T)+2V, I
O=1mA~1.5A
IGND
VOUT(T)<2.0V
-0.15
-0.1
-0.4
Note3
-
0.15
0.1
0.4
7
I =1mA
IN=VOUT
O
V
%
Line Regulation
REGLINE
2.0V≤VOUT(T)<4.0V
4.0V≤VOUT(T)
0.02
-
VOUT(T)+2
-
V
Input Voltage
VIN
Over Temperature Shutdown
Over Temperature Hysterisis
150
30
-
к
к
OTS
OTH
-
-
Output Voltage
Temperature Coefficient
ppm/к
-
30
-
TC
V
IN=VOUT(T)+1V, VOUT<0.4V
-
-
-
-
-
750
70
50
20
30
-
-
-
-
-
mA
ISC
Short Circuit Current
Power Supply Rejection
Output Voltage Noise
f=100Hz
f=1kHz
Io=100mA
Co=4.7ꢁF
dB
PSRR
f=10kHz
f=10Hz~100kHz, Io=10mA, Co=4.7ꢁF
ꢁVrms
eN
Note 1: VOUT (E) =Effective Output Voltage (i.e. the output voltage when “VOUT (T) + 2.0V” is provided at the VIN pin while maintaining a
certain IOUT value).
2: VOUT (T) =Specified Output Voltage
3: VIN (MIN) =VOUT+VDROPOUT
http://www.SeCoSGmbH.com/
Any changing of specification will not be informed individual
01-Jun-2002 Rev. A
Page 2 of 5
SE2138
1.5A CMOS
Elektronische Bauelemente
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
become active when the junction temperature exceeds150oC, or the current exceeds 2.2A.During thermal shutdown, the output voltage
remains low. Normal operation is restored when the junction temperature drops below 120oC.The SE2138 behaves like a current
Ω
source when the load reaches 2.2A. However, if the load impedance drops below 0.3 , the current drops back to 600mA to prevent
Ω
excessive power dissipation. Normal operation is restored when the load resistance exceeds of 0.75
.
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 VIN. 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
h tp://www.SeCoSGmbH.com/
Any changing of specification will not be informed individual
01-Jun-2002 Rev. A
Page 3 of 5
SE2138
1.5A CMOS
Elektronische Bauelemente
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
1.5A CMOS
Elektronische Bauelemente
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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