Description
The SE8117B series of high performance low
dropout
voltage
regulators
are
designed
for
Features
Low Dropout Performance.
Low Quiescent Current：3mA（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.
Rugged 2KV ESD withstand capability.
Available in SOT-223 and TO252 Packages.
RoHS Compliant and 100% Lead (Pb)-Free
applications that require efficient conversion and
fast transient response.
In addition, SE8117B 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.
SE8117B
is
characterized
under
Junction
Temperature from -40° to +130°
C
C.
Application
Active SCSI Terminators.
High Efficiency Linear Regulators.
5V to 3.3V Linear Regulators
Motherboard Clock Supplies.
Pin Configuration
Ordering Information
Device
Marking
Information
SE8117TXXLF
SE8117TALF
Package
V
OUT
Fixed output voltages; XX denotes voltage options
SOT-223 TO-252
(Lead-free)
SE8117BTALF
Adjustable output voltage.
(1.5V,1.8V, 2.5V,3.3V and 5.0V).
SE8117BTXXLF
Absolute Maximum Rating
Symbol
V
IN
θ
JA
T
J
T
STG
T
LEAD
Parameter
Input Supply Voltage
Thermal Resistance Junction to Ambient (SOT-223)
Operating Junction Temperature Range
Storage Temperature Range
Lead Temperature (Soldering 10 Sec)
Maximum
9
60
-25 to 130
-40 to 150
260
Units
V
°
C/W
°
C
°
C
°
C
Revision 1/13/2011
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
≤ 8V, V
IN,MIN
– V
OUT
= 1.5V, I
OUT
= 10mA, C
IN
= 10µF, C
OUT
= 22µF, T
A
= 25° unless otherwise
C,
specified.
Symbol
Parameter
Test Condition
SE8117BT-15
SE8117BT-18
V
O
Output Voltage
(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
0.5
3
65
14
1.3
0.4
1.8
0.07
175
0.003
Max
1.530
1.836
2.550
3.366
5.100
(+2%)
--
--
--
--
--
--
--
--
--
--
--
Units
SE8117BT-25
SE8117BT-33
SE8117BT-50
(1)
V
V
REF
V
SR
V
LR
I
Q
I
ADJ
∆I
ADJ
V
D
I
O
I
CL
T
C
OTP
V
N
Reference Voltage
(Adj. Voltage Version)
Line Regulation
Load Regulation
(1)
(V
IN
- V
OUT
) = 1.5V
I
OUT
= 10mA
V
OUT
+ 1.5V < V
IN
< 8V
I
OUT
= 10mA
(V
IN
- V
OUT
) = 1.5V
10mA ≤ I
OUT
≤ 1A
Fixed Output Version
V
%
%
mA
μA
μA
V
mA
A
%/°
C
°
C
%V
O
(1)
Quiescent Current
(2)
Adjust Pin Current
Adjust Pin Current
Change
Dropout Voltage
(3)
V
OUT
+ 1.5V < V
IN
< 8V
10mA ≤ I
OUT
≤ 1A
I
OUT
= 1A
--
--
--
--
--
--
Minimum Load Current
Current Limit
Temperature Coefficient
Thermal Protection
RMS Output Noise
T
A
= 25° 10Hz ≤ f ≤ 10kHz
C,
f = 120Hz,
C
OUT
= 22μF (Tantalum),
(V
IN
- V
OUT
) = 3V, I
OUT
= 10mA
--
R
A
Notes:
Ripple Rejection Ratio
--
55
--
dB
1. Low duty cycle pulse testing with which T
J
remains unchanged.
2. The I
Q
of SE8117BT15 is 1.2mA(Typ.)
3.
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
+1.5V.
Revision 1/13/2011
Preliminary and all contents are subject to change without prior notice.
© Seaward Electronics, Inc., 2006. • www.seawardinc.com.cn • Page 2
Typical Application
Adjustable Voltage Regulator
V
IN
>= 3.0V
3
2
SE8117BTA
V
REF
C
IN
10uF
1
V
OUT
= 1.5V
R1
124 Ohm
C
OUT
22uF
I
ADJ
R2
24.9 Ohm
V
OUT
R
2
½
V
REF
(1
)
I
ADJ
R
2
R
1
Fixed Voltage Regulator
V
IN
>= 4.8V
3
2
V
OUT
= 3.3V
SE8117BT33
C
IN
10uF
C
OUT
22uF
I
Q
1
Revision 1/13/2011
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 SE8117B has built-in
When the thermal limit is
external capacitors to ensure stability. However,
SE8117B 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
P
D
= I
OUT
* [V
IN
– V
OUT
]
Input Capacitor
An input capacitor of 10μF is recommended.
Ceramic or Tantalum can be used.
can be increased without upper limit.
The value
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 180°
C/W for SE8117B.
SE8117B
is designed to enter thermal protection at 175°
C.
Output Capacitor
An output capacitor of 22uF is recommended for
better transient and PSRR performance.
It
For example, if T
A
is 25° then the maximum P
D
C
is limited to about 0.83W.
In other words, if
I
OUT(MAX)
= 500mA, then [V
IN
– V
OUT
] can not
exceed 1.66V. (Ref. SO223 without heat sink.)
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
increased without upper limit.
Revision 1/13/2011
Preliminary and all contents are subject to change without prior notice.
© Seaward Electronics, Inc., 2006. • www.seawardinc.com.cn • Page 4
Typical Performance Characteristics
Re fe re nc e V o lta g e vs J unc ti o n Te mp e ra ture
1.252
1.25
1.248
1.246
1.244
1.242
1.24
1.238
1.236
1.234
1.232
1.23
1.228
1.226
1.224
1.222
1.22
-25
0
25
50
75
100
125
150
J unc ti o n Te mp e ra ture (C )
Outp ut V o lta g e vs J unc ti o n Te mp e ra ture
3.38
Reference Voltage (V)
Output Voltage (V)
3.36
3.34
3.32
3.3
3.28
3.26
3.24
-25
0
25
50
75
100
125
150
J unc ti o n Te mp e ra ture (C )
Dropout Voltage (V)
D r o p o u t V o l t a g e vs . O u t p u t C u r r e n t
1.17
1.15
PSRR (dB)
70
60
50
40
30
20
10
0
P S RR vs F re q ue nc y
1.13
1.11
1.09
1.07
1.05
1.03
0
200
400
600
800
1000
10
100
Output Current(mA)
1000
F re q ue nc y (Hz)
10000
Line Transients
V
IN
= 4.5V – 5.5 V
Load Transients
C
IN
= 0.1μF, C
OUT
= 1μF
C
OUT
= 22μF, C
IN
= 10μF
Revision 1/13/2011
Preliminary and all contents are subject to change without prior notice.
© Seaward Electronics, Inc., 2006. • www.seawardinc.com.cn • Page 5
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