Solved by
SPX1129
TM
400mA Low Dropout Voltage Regulator
FEATURES
■
1% Output Accuracy 3.3V, 5V,
at 500mA Output
■
Very Low Quiescent Current
■
0.42V Dropout Voltage at 400mA
■
Extremely Tight Load and Line Regulation
■
Current & Thermal Limiting
■
Reverse Battery Protection
■
Equivalent Replacement For LT1129
SPX1129
3 Pin TO-263
SPX1129
3 Pin TO-220
1
2
3
1
2
3
V
OUT
Note:
Tab is Ground
GND V
for all 4 packages.
Available in Lead Free Packaging
IN
V
OUT
GND V
IN
SPX1129
3 Pin SOT-223
APPPLICATIONS
■
Power Supply
■
Communications Equipment
■
Computers and Peripherals
1
2
3
SPX1129
3
TO-252
V
IN
GND
V
OUT
2
1
V
IN
GND V
OUT
Now Available in Lead Free Packaging
DESCRIPTION
The SPX1129 is a low power voltage regulator. This device is an excellent choice for use in battery-powered
applications such as cordless telephones, radio control systems, and portable computers. The SPX1129
features very low quiescent current and very low dropout voltage of 0.42 volts. This includes a tight initial
tolerance of
±1%
max, and a very low output temperature coefficient, making the SPX1129 useful as a low-
power voltage reference.
The SPX1129 is offered in a SOT-223, TO-220, TO-252 & TO-263 3 lead packages.
TYPICAL APPLICATION CIRCUIT
V
IN
I
IN
IN
OUT
5V
I
L
SPX1129
0.1µF
+
GND
+
LOAD
2.2µF
I
IN
= I
L
+ I
G
I
G
Fixed +5V Regulator Circuit..
Mar3-07
SPX29 400 mA Low Dropout Linear Regulator
© 2007 Sipex Corporation
ABSOLUTE MAXIMUM RATINGS
Power Dissipation ........................................................ Internally Limited
Lead Temp. (Soldering, 5 Seconds) ............................................. 260°C
Storage Temperature Range ........................................ -65°C to +150°C
Operating Junction Temperature Range ....................... -40°C to +125°C
Input Supply Voltage .......................................................... -20V to +20V
ESD Rating ................................................................................ 2kV Min
Thermal Resistance
JA
TO-263 ............................................................................. 31.4°C/W
TO-220 ............................................................................. 29.4°C/W
SOT-223 .......................................................................... 62.3°C/W
ELECTRICAL CHARACTERISTICS
Electrical characteristics at V
IN
= 6V, I
O
= 1mA, C
OUT
= 2.2µF, T
A
= 25°C, unless otherwise specified.
Boldface
applies over
the full operating temperature range.
PARAMETER
3.3V Version
Output Voltage
1mA I
L
400mA
Reverse Output Current
5.0V Version
Output Voltage
1mA I
L
400mA
Reverse Output Current
All Voltage Options
Output Voltage
Temperature Coefficient
Line Regulation
Load Regulation (Note 3)
Dropout Voltage (Note 5)
(Note1)
6V V
IN
20V (Note 4)
I
L
=1 to 400mA
I
L
=1mA
I
L
=400mA
Ground Current
I
L
=1mA
I
L
=10mA
I
L
=50mA
I
L
=100mA
I
L
=400mA
Current Limit
Ripple Rejection
V
OUT
=0
V
IN
-V
OUT
=1V(Avg),
V
RIPPLE
=0.5Vp-p, F
RIPPLE
=120Hz,
I
LOAD
=400mA, T
J
= 25°C
Input Reverse Leakage Current
V
IN
= -20V, V
OUT
=0V
1.0
mA
Note 1:
Output or reference voltage temperature coefficients defined as the worst case voltage change divided by
the total temperature range.
Note 2:
Unless otherwise specified all limits are guaranteed for T
j
= 25
°C,
V
IN
= 6V, I
L
= 1mA and C
L
= 2.2
µF.
Note 3:
Regulation is measured at constant junction temperature, using pulse testing with a low duty cycle. Changes
in output voltage due to heating effects are covered under the specification for thermal regulation.
Note 4:
Line regulation for the SPX1129 is tested at 25°C for I
L
= 1 mA. For T
J
= 125°C, line regulation is guaranteed
by design.
Note 5:
Dropout voltage is defined as the input to output differential at which the output voltage drops 100 mV below
its nominal value measured at 1V differential.
Mar3-07
SPX29 400 mA Low Dropout Linear Regulator
© 2007 Sipex Corporation
CONDITIONS
(Note 2)
TYP
MIN
MAX
UNITS
3.3
3.3
16
5.0
5.0
16
20
1.5
6
0.13
0.42
100
350
1.5
2
7
330
58
V
OUT
= 5.0V, V
IN
= 0V
V
OUT
= 3.3V, V
IN
= 0V
3.267
3.217
3.333
3.382
25
V
µA
V
µA
ppm/°C
mV
mV
V
4.950
4.880
5.050
5.120
25
100
10
20
30
0.17
0.25
0.55
0.70
200
500
3
6
25
800
µA
mA
mA
dB
50
2
APPLICATION INFORMATION
External Capacitors
The stability of the SPX1129 requires a 2.2µF or
greater capacitor between output and ground.
Oscillation could occur without this capacitor.
Most types of tantalum or aluminum electrolytic
works fine here. For operations of below -25°C
solid tantalum is recommended since the many
aluminum types have electrolytes that freeze at
about -30°C. The ESR of about 5 or less and
resonant frequency above 500kHz are the most
important parameters in the value of the capaci-
tor. The capacitor value can be increased with-
out limit.
The SPX1129, unlike other low dropout regula-
tors will remain stable and in regulation with no
load in addition to the internal voltage divider.
This feature is especially important in applica-
tions like CMOS RAM keep-alive.
If there is more than 10 inches of wire between
the input and the AC filter capacitor, or if a
battery is used as the input, then a 0.1µF tanta-
lum or aluminum electrolytic capacitor should
be placed from the input to the ground.
Reducing Output Noise
It may be an advantage to reduce the AC noise
present at the output. One way is to reduce the
regulator bandwidth by increasing the size of
the output capacitor. Increasing the capacitor
from 1µF to 220µF decreases the noise from
430µV to 160µV rms for a 100kHz bandwidth
at 5V output.
Mar3-07
SPX29 400 mA Low Dropout Linear Regulator
© 2007 Sipex Corporation
3
PAckAge: 3 Pin SOT-223
Mar3-07
SPX29 400 mA Low Dropout Linear Regulator
© 2007 Sipex Corporation
4
PAckAge: 3 Pin TO-252
Mar3-07
SPX29 400 mA Low Dropout Linear Regulator
© 2007 Sipex Corporation
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