Description
SE1122 is a low dropout positive fixed-mode regulator
with minimum of 1A output current capability. The
product
is
specifically
designed
to
provide
Features
1.3V typical dropout at full load current
Fixed 1.2V± 2% output voltage
Fast transient response
Output current limiting
Built-in thermal shutdown
Good noise rejection
Rugged 2KV ESD withstand capability.
Available in SOT223 Packages.
RoHS Compliant and 100% Lead (Pb)-Free
well-regulated supply for low voltage IC applications
such as high-speed bus termination and low current
1.2V logic supply. SE1122 is also well suited for other
applications
such
as
VGA
cards.
SE1122
is
guaranteed to have a typical 1.3V dropout at full load
current making it ideal to provide well-regulated
outputs of 1.2 output voltage with 2.7V input voltage
supply.
Pin Configuration
Application
PC peripheral
Communication
Ordering Information
Device
Package
SOT-223
(Lead-free)
V
OUT
Fixed output voltages
1.2V
SE1122
Typical Application
Revision 8/3/2007
Preliminary and all contents are subject to change without prior notice.
© Seaward Electronics, Inc., 2007 • www.seawardinc.com • Page 1
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
12
60
0 to 125
-40 to 150
260
Units
V
°C/W
°C
°C
°C
Electrical Characteristic
V
IN
=2.8V, I
OUT
= 10mA, C
IN
= 10µF, C
OUT
= 10µF, TA = 25°C, unless otherwise specified.
Symbol
V
O
V
SR
V
LR
Iq
V
D
I
CL
T
C
OTP
V
N
R
A
Notes:
1. Low duty cycle pulse testing with which T
J
remains unchanged.
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 2% from the nominal value
obtained at V
IN
= V
OUT
+Vdropout.
Parameter
Output Voltage
(1)
Line Regulation
(1)
Load Regulation
(1)
Quiescent Current
Dropout Voltage
(2)
Current Limit
Temperature Coefficient
Thermal Protection
RMS Output Noise
Ripple Rejection Ratio
T
A
= 25°C, 10Hz
≤
f
≤
10kHz
f = 120Hz,
C
OUT
= 22μF (Tantalum),
(V
IN
- V
OUT
) = 3V, I
OUT
= 10mA
I
OUT
= 1A
--
1.1
--
--
--
--
2.8V < VIN < 12V
10mA
≤
I
OUT
≤
1A
Test Condition
Min
1.176
--
--
Typ
1.2
0.3
0.5
1.2
1.3
--
0.02
175
0.003
57
--
--
--
--
--
--
Max
1.224
--
--
Units
V
%
%
mA
V
A
%/°C
°C
%V
O
dB
Revision 8/3/2007
Preliminary and all contents are subject to change without prior notice.
© Seaward Electronics, Inc., 2007 • www.seawardinc.com • Page 2
Dropout Voltage VS Output Current
1.30
Dropout Voltage (V)
1.25
1.20
1.15
1.10
1.05
1.00
0
200
400
600
800 1000 1200
PSRR
70
60
PSRR (dB)
50
40
30
20
10
0
10
100
1000
10000
Output Current (mA)
Frequency (Hz)
Revision 8/3/2007
Preliminary and all contents are subject to change without prior notice.
© Seaward Electronics, Inc., 2007 • www.seawardinc.com • Page 3
Outline Drawing for SOT-223
Customer Support
Seaward Electronics Incorporated – China
Rm 1605, Building 1, International Pioneering Park, #1 Shangdi Xinxi Rd
Haidian District, Beijing 100085, China
Tel: 86-10-8289-5700/01/05
Fax: 86-10-8289-5706
Seaward Electronics Corporation – Taiwan
2F, #181, Sec. 3, Minquan East Rd,
Taipei, Taiwan R.O.C
Tel: 886-2-2712-0307
Fax: 886-2-2712-0191
Seaward Electronics Incorporated – North America
1512 Centre Pointe Dr.
Milpitas, CA95035, USA
Tel: 1-408-821-6600
Last Updated - 8/3/2007
Revision 8/3/2007
Preliminary and all contents are subject to change without prior notice.
© Seaward Electronics, Inc., 2007 • www.seawardinc.com • Page 4
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