®
SPX1521
300mA Low Dropout Voltage Regulator
FEATURES
■
1% Output Accuracy 3.3V, 5V,
at 300mA Output
■
Very Low Quiescent Current
■
0.3V (Typ.) Dropout Voltage at 300mA
■
Extremely Tight Load and Line Regulation
■
Current & Thermal Limiting
■
Reverse Battery Protection
■
Equivalent Replacement For LT1521
SPX1521
3 Pin TO-263
1
2
3
V
OUT
GND V
IN
Now Available in Lead Free Packaging
DESCRIPTION
The SPX1521 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 SPX1521
features very low quiescent current and very low dropout voltage. This includes a tight initial tolerance of
±1%
max, and very low output temperature coefficient, making the SPX1521 useful as a low-power voltage
reference.
The SPX1521 is offered in 3 pin TO-252, SOT-223, TO-220 & TO-263 packages.
TYPICAL APPLICATIONS CIRCUIT
V
OUT
I
IN
IN
OUT
5V
I
L
SPX1521
0.1µF
+
GND
+
2.2µF
LOAD
I
IN
= I
L
+ I
G
I
G
Date: 5/25/04
SPX1521 300mA Low Dropout Voltage Regulator
©Copyright 2004 Sipex Corporation
1
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
Shutdown Input Voltage ................................................. -0.6V to +6.5V
ESD Rating .............................................................................. 2kV Min
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
≤
300mA
Reverse Output Current
5.0V Version
Output Voltage
1mA
≤
I
L
≤
300mA
Reverse Output Current
All Voltage Options
Output Voltage
Temperature Coefficient
Line Regulation
Load Regulation (Note 3)
Dropout Voltage (Note 5)
20
(Note1)
6V
≤
V
IN
≤
20V (Note 4)
I
L
=1 to 300mA
I
L
=1mA
I
L
=300mA
Ground Current
I
L
=1mA
I
L
=10mA
I
L
=50mA
I
L
=100mA
I
L
=300mA
Current Limit
Ripple Rejection
V
OUT
=0
V
IN
-V
OUT
=1V(Avg),
V
RIPPLE
=0.5Vp-p,
F
RIPPLE
=120Hz, I
LOAD
=150mA
Input Reverse Leakage Current
V
IN
= -20V, V
OUT
=0V
1.0
mA
1.5
4
0.13
0.30
100
350
1.5
2
5
330
58
50
20
20
30
0.17
0.25
0.55
0.70
150
500
3
6
14
500
mA
dB
mV
mV
V
100
ppm/°C
V
OUT
= 5.0V, V
IN
= 0V
5.0
5.0
16
4.950
4.880
5.050
5.120
25
V
µA
V
OUT
= 3.3V, V
IN
= 0V
3.3
3.3
16
3.267
3.217
3.333
3.382
25
µA
V
CONDITIONS
(Note 2)
TYP
MIN
MAX
UNITS
µA
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
= 2.2µF.
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 SPX1521 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.
Date: 5/25/04
SPX1521 300mA Low Dropout Voltage Regulator
©Copyright 2004 Sipex Corporation
2
APPLICATION INFORMATION
External Capacitors
The stability of the SPX1521 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 5Ω 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 SPX1521, 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 tantalum
or aluminum electrolytic capacitor should be
placed from the input to the ground.
PINOUTS
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 only decreases the noise
from 430µV to 160µVrms for a 100kHz band-
width at 5V output.
SOT-223 (M3)
TO-263-3 (T)
TO-220-3 (U)
TO-252 (R)
3
V
IN
GND
V
OUT
SPX1521
1
2
3
1
SPX1521
2
3
2
SPX1521
1
2
3
1
V
IN
GND V
OUT
Front View
V
OUT
GND V
IN
Top View
Top View
V
OUT
GND V
IN
Front View
Date: 5/25/04
SPX1521 300mA Low Dropout Voltage Regulator
©Copyright 2004 Sipex Corporation
3
PACKAGE: 3 PIN TO-263
SEATING PLANE
A
E/2
L1
C2
E
D
H
1
2
3
B
B
c
e
See View C
b2
b
GAUGE PLANE
0º-8º
A1
View C
SEATING
PLANE
L
3-PIN TO-263
JEDEC TO-263
(AA) Variation
A
A1
b
c
D
D1
E
E1
e
H
L
L1
L2
L3
.575
.070
-
-
Dimensions in inches
MIN
.160
.000
.020
.015
.330
.270
.380
.245
-
-
-
-
-
.100 BSC
-
-
-
-
.625
.110
.066
.070
NOM MAX
-
-
-
.190
.010
.039
.029
.380
-
.420
-
b
WITH PLATING
c
BASE METAL
SECTION B-B
.010 BSC
3 PIN TO-263
Date: 5/25/04
SPX1521 300mA Low Dropout Voltage Regulator
©Copyright 2004 Sipex Corporation
4
PACKAGE: 3 PIN TO-220
E
B
A
E2
E/2
A
SEATING
PLANE
Q
øP
A1
H1
D
D1
L1
1
CHAMFER
OPTIONAL
C C
D
D
L
e
e1
b
C
A2
A
Dimensions in
(mm)
A
A1
A2
b
b2
c
D
D1
D2
E
E1
E2
e
e1
H1
L1
L2
∆P
Q
3 PIN TO-220
JEDEC TO-220
(AB) Variation
MIN
NOM MAX
.140
.020
.080
.015
.045
.014
.560
.330
.480
.380
.270
-
-
-
-
.027
-
-
-
-
-
-
-
-
.190
.055
.115
.040
.070
.024
.650
.355
.507
.420
.350
.030
b
WITH PLATING
c
BASE METAL
CONTACT AREA
.100 BSC
.200 BSC
.230
-
-
.139
.100
-
-
-
-
-
.270
.250
-
.161
.135
3 PIN TO-220
Date: 5/25/04
SPX1521 300mA Low Dropout Voltage Regulator
©Copyright 2004 Sipex Corporation
5
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