Description
The SE8117 series of high performance low dropout
voltage regulators are designed for applications that
require efficient conversion and fast transient
response.
In addition, SE8117 is designed to be stable under
conditions where Cin and Cout are not present.
However, it is recommended to include Cin and
Cout in the system design as this will speed up the
transient response and increase the PSRR rating.
SE8117
is
characterized
under
Junction
Features
Low Dropout Performance.
Low Quiescent Current：2.7mA（Typ.）
Guaranteed 1A Output Current.
Wide Input Supply Voltage Range.
Stable operation without Cin and Cout.
Over-temperature and Over-current Protection.
Fixed or Adjustable Output Voltage.
Available in SOT-223 and TO252 Packages.
RoHS Compliant
Temperature from -40°C to +125°C.
Application
Active SCSI Terminators.
High Efficiency Linear Regulators.
5V to 3.3V Linear Regulators
Motherboard Clock Supplies.
Pin Configuration
Ordering Information
Device
SE8117TXXHF
SE8117TXXLF
Marking
Information
SE8117TXXHF
SE8117TXXLF
SOT-223(Halogen Free)
TO-252(Lead Free)
Package
V
OUT
XX denotes voltage options (ADJ,1.5V,1.8V,
2.5V,3.3V and 5.0V)
Absolute Maximum Rating
Symbol
V
IN
θ
JA
T
J
T
STG
T
LEAD
T
MJ
Parameter
Input Supply Voltage
Thermal Resistance Junction to Ambient (SOT-223)
Operating Junction Temperature Range
Storage Temperature Range
Lead Temperature (Soldering 10 Sec)
Maximum Junction Temperature
Maximum
18
120
-40 to 125
-40 to 150
260
150
Units
V
°C/W
°C
°C
°C
°C
Revision 11/11/2013
Preliminary and all contents are subject to change without prior notice.
© Seaward Electronics, Inc., 2006. • www.seawardinc.com.cn • Page 1
Electrical Characteristic
V
IN,MAX
≤
9V, V
IN,MIN
– V
OUT
= 2V, I
OUT
= 10mA, C
IN
= 10µF, C
OUT
= 22µF, T
A
= 25°C, unless otherwise
specified.
Symbol
Parameter
Test Condition
SE8117T-15
SE8117T-18
V
O
Output Voltage
SE8117T-25
SE8117T-33
SE8117T-50
V
REF
V
SR
V
LR
I
Q
I
ADJ
(I
GND
)
∆I
ADJ
V
D
I
O
I
CL
T
C
OTP
V
N
Reference Voltage
(Adj. Voltage Version)
Line Regulation
Load Regulation
(1)
Min
1.470
1.764
2.450
3.234
4.900
(-2%)
--
--
--
--
Typ
1.5
1.8
2.5
3.3
5.0
1.250
0.3
0.0001
2.7
50
0.2
1.38
0.4
1.35
30
175
0.003
Max
1.530
1.836
2.550
3.366
5.100
(+2%)
--
--
5
120
5
1.49
5
--
--
--
--
Units
V
(V
IN
- V
OUT
) = 1.5V
I
OUT
= 10mA
V
OUT
+ 1.5V < V
IN
< 9V
I
OUT
= 10mA
(V
IN
- V
OUT
) = 2.0V
10mA
≤ I
OUT
≤ 1A
Fixed Output Version
V
%/V
%/mA
mA
μA
μA
V
mA
A
ppm/℃
/V
°C
%V
O
Quiescent Current
Adjust Pin Current
（GND
Current）
Adjust Pin Current
Change
Dropout Voltage
(1) (2)
V
OUT
+ 1.5V < V
IN
< 9V
--
--
--
1
--
I
OUT
= 1A
Minimum Load Current
Current Limit
(1)
Temperature Coefficient
Thermal Protection
RMS Output Noise
V
IN
=9V, I
OUT
=10mA
T
A
= 25°C, 10Hz
≤
f
≤
10kHz
f = 120Hz,
C
OUT
= 22μF
(Tantalum),
(V
IN
- V
OUT
) = 3V, I
OUT
= 10mA
--
--
R
A
Notes:
Ripple Rejection Ratio
--
60
--
dB
1. Low duty cycle pulse testing with which T
J
remains unchanged.
2.
The dropout voltage is the input/output differential at which the circuit ceases to regulate against further
reduction in input voltage. It is measured when the output voltage has dropped 98% from the nominal
value obtained at V
IN
= V
OUT
+2V.
Revision 11/11/2013
Preliminary and all contents are subject to change without prior notice.
© Seaward Electronics, Inc., 2006. • www.seawardinc.com.cn • Page 2
Typical Application
Revision 11/11/2013
Preliminary and all contents are subject to change without prior notice.
© Seaward Electronics, Inc., 2006. • www.seawardinc.com.cn • Page 3
Application Hints
The typical Linear regulator
would require
Thermal Considerations
It is important that the thermal limit of the package
is not exceeded.
thermal protection.
The SE8117 has built-in
When the thermal limit is
external capacitors to ensure stability. However,
SE8117 is designed in such a way that these
external capacitor can be omitted if the PCB
layout is tight and system noise is not very high.
For better transient and PSRR performance, the
Input
and
Output
capacitors
are
still
exceeded, the IC will enter protection, and V
OUT
will be pulled to ground.
The power dissipation
for a given application can be calculated as
following:
recommended.
The power dissipation (P
D
) is
Input Capacitor
An input capacitor of 10μF is recommended.
Ceramic or Tantalum can be used.
can be increased without upper limit.
The value
P
D
= I
OUT
* [V
IN
– V
OUT
]
The thermal limit of the package is then limited to
P
D(MAX)
= [T
J
– T
A
]/Θ
JA
where T
J
is the junction
temperature, TA is the ambient temperature, and
Θ
JA
is around 120°C/W for SE8117.
SE8117 is
Output Capacitor
An output capacitor of 22uF is recommended for
better transient and PSRR performance.
It
designed to enter thermal protection at 125°C.
For example, if T
A
is 25°C then the maximum P
D
is limited to about 0.83W.
In other words, if
should be placed no more than 1 cm away from
the V
OUT
pin, and connected directly between
V
OUT
and GND pins.
The value may be
I
OUT(MAX)
= 500mA, then [V
IN
– V
OUT
] can not
exceed 1.66V. (Ref. SOT223 without heat sink.)
increased without upper limit.
Revision 11/11/2013
Preliminary and all contents are subject to change without prior notice.
© Seaward Electronics, Inc., 2006. • www.seawardinc.com.cn • Page 4
Typical Performance Characteristics
Reference Voltage vs Junction Temperature
1.251
1.250
Output Voltage vs Load Current
1.7872
1.787
Reference Voltage (V)
1.249
1.248
1.247
1.246
1.245
1.244
25
40
55
70
85
100
115
130
145
Junction Temperature (C)
Output Voltage (V)
1.7868
1.7866
1.7864
1.7862
1.786
1
10
100
1000
Load Current (mA)
Dropout Voltage vs Load Current
1.5
1.4
PSRR vs Frequency
70.0
60.0
50.0
Dropout Voltage (V)
PSRR(dB)
1.3
1.2
1.1
1
0.9
1
10
100
1000
Load Current (mA)
40.0
30.0
20.0
10.0
0.0
100
1000
10000
100000
Frequency(Hz)
Dropout Volatge VS Oueput Current
Adjus Pin Current VS Temperature
Revision 11/11/2013
Preliminary and all contents are subject to change without prior notice.
© Seaward Electronics, Inc., 2006. • www.seawardinc.com.cn • Page 5
