®
SPX1121
150mA Low Dropout Voltage Regulator
FEATURES
■
5.0V and 3.3V output versions
■
1% Output Accuracy
■
Very Low Quiescent Current
■
Low Dropout: 300mV @ 150mA
■
Very Tight Load & Line Regulation
■
Very Low Temperature Coefficient
■
Current and Thermal Limiting
■
Requires only 1µF for Stability
■
Equivalent Replacement for LT1121
■
Industry Standard SOT-223 and TO-92
3 lead packages
V
OUT
I
IN
IN
OUT
5V
I
L
SPX1121
+
0.1µF
GND
+
2.2µF
LOAD
I
IN
= I
L
+ I
G
I
G
Figure 1. Fixed +5V Regulator Circuit
DESCRIPTION
The SPX1121 is a low power voltage regulator. It is an excellent choice for use in battery-powered
applications such as cordless telephones, radio control systems, and portable computers. The
SPX1121 features very low quiescent current and low dropout voltage (typ. 20mV at 100µA and
300mV at 150mA). A tight initial tolerance (1%), extremely good load and line regulation (0.05%
typ.), and very low output temperature coefficient (20 ppm/°C typ.), make the SPX1121 useful
as a low power voltage reference.
PACKAGES
SOT-223 Package (M3)
TO-92 (N)
1
2
3
SPX1121
1
2
3
OUTPUT
INPUT
GND
V
IN
GND
V
OUT
Front View
Bottom View
Rev. 10/11/02
SPX1121 150mA Low DropoutVoltage Regulator
© Copyright 2002 Sipex Corporation
1
ABSOLUTE MAXIMUM RATINGS
Power Dissipation........................................Internally Limited
Lead Temperature (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...........................................-0.3V to +30V
ESD Rating................................................................2kV min
ELECTRICAL CHARACTERISTICS
applies over the full operating temperature ranges.
V
IN
=6V, I
L
=100µA, C
L
=1µF (N
OTE
2), T
A
= 25°C, unless otherwise specified. Boldface
PARAMETER
3.3 V Versions
Output Voltage
5 V Versions
Output Voltage
All Voltage Options
Output Voltage
Temperature Coefficient
Line Regulation (N
OTE
3)
Load Regulation (N
OTE
3)
Dropout Voltage
(N
OTE
5)
CONDITIONS
T
J
=25°C
1mA
≤I
L
≤150
mA
T
J
= 25°C
1 mA
≤I
L
≤150
mA
(N
OTE
1)
6V≤V
IN
≤30V
(N
OTE
4)
100
µA≤I
L
≤150
mA
I
L
= 100µA
I
L
= 1mA
I
L
= 100 mA
I
L
= 150 mA
I
L
= 100µA
I
L
= 1mA
I
L
= 10mA
I
L
= 50mA
I
L
= 100 mA
I
L
= 150 mA
V
OUT
= 0
C
L
= 1µF
C
L
= 200
µF
MIN.
3.267
3.217
4.950
4.880
TYP.
3.300
3.300
5.000
5.000
20
0.03
0.04
20
110
270
300
100
110
350
1
3
5
230
0.05
430
160
MAX
3.333
3.382
5.050
5.120
100
0.20
0.60
UNIT
V
V
ppm/°C
%
%
mV
Ground Current
550
170
µA
mA
6
10
500
0.20
Current Limit
Thermal Regulation
Output Noise,
10Hz to 100kHz
mA
%/W
µV
rms
µV
rms
N
OTE
1: Output or reference voltage temperature coefficients defined as the worst case voltage change
divided by the total temperature range.
N
OTE
2: Unless otherwise specified all limits guaranteed for T
J
= 25°C, V
IN
= 6V, I
L
= 100µA and C
L
= 1µF.
N
OTE
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.
N
OTE
4: Line regulation for the SPX1121 is tested at I
L
= 1mA. For T
J
= 125°C, line regulation is guaranteed
by design. See typical performance characteristics for line regulation versus temperature and load
current.
N
OTE
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.
Rev. 10/11/02
SPX1121 150mA Low DropoutVoltage Regulator
© Copyright 2002 Sipex Corporation
2
TYPICAL PERFORMANCE CHARACTERISTICS
6
5
OUTPUT VOLTAGE (VOLTS)
INPUT CURRENT (µA)
250
225
R
L
= 50kΩ
GROUND PIN CURRENT (mA)
10
200
175
150
125
100
75
50
25
0
0
1
2
3
4
5
6
0
1
2
3
4
5
6
7
8
9 10
INPUT VOLTAGE (VOLTS)
R
L
=
8
4
R
L
=50kΩ
1
3
R
L
=50kΩ
2
1
0
INPUT VOLTAGE (VOLTS)
0.1
0.01
0.1
1
10
100
LOAD CURRENT (mA)
Dropout Characteristics
Input Current
Ground Current vs. Load Current
320
280
GROUND CURRENT (µA)
INPUT CURRENT (mA)
240
200
160
I
L
= 0
I
L
= 1mA
120
80
40
0
0
1
2
3
4
5
6
7
8
160
150
140
130
120
110
100
90
80
70
60
50
40
30
20
10
0
0
1
2
3
4
5
6
6
GROUND CURRENT (mA)
R
L
=50
Ω
V
OUT
= 5V
5
V
IN
= 6V
I
L
= 100mA
4
3
7
8
9 10
-75 -50 -25
0
25 50
75 100 125 150
TEMPERATURE (ºC)
INPUT VOLTAGE (VOLTS)
INPUT VOLTAGE (VOLTS)
Ground Current vs. Input Voltage
8
7
Input Current
190
Ground Current
QUIESCENT CURRENT (µA)
GROUND CURRENT (mA)
6
I
L
=100mA
170
V
IN
=6V
I
L
=100uA
5
4
3
2
1
0
0
1
2
3
4
5
6
7
8
150
130
-75 -50 -25
0
25 50
75 100 125 150
INPUT VOLTAGE
TEMPERATURE (ºC)
Ground Current
Quiescent Current
Rev. 10/11/02
SPX1121 150mA Low DropoutVoltage Regulator
© Copyright 2002 Sipex Corporation
3
TYPICAL PERFORMANCE CHARACTERISTICS
500
I
L
= 150mA
SHORT CIRCUIT CURRENT (mA)
500
240
230
400
DROP-OUT VOLTAGE (mV)
DROP-OUT VOLTAGE (mV)
400
220
210
200
190
180
170
-75 -50 -25
300
200
~
~
300
200
T
J
= 25ºC
40
20
0
-75 -50 -25
0
25 50
75 100 125 150
I
L
= 100µA
100
0
100µA
1mA
10mA
100mA
0
25 50
75 100 125 150
TEMPERATURE (ºC)
OUTPUT CURRENT
TEMPERATURE (ºC)
Drop-Out Voltage
100
mV
50
mV
INPUT OUTPUT VOLTAGE
VOLTAGE CHANGE
Drop-Out Voltage
10
I
O
= 100µA
Short Circuit Current
90
80
RIPPLE REJECTION (dB)
OUTPUT IMPEDANCE (OHMS)
5
2
1
0.5
0.2
0.1
0.05
0.02
0.01
10
100
1K
10K
100K
1M
V
OUT
= 5V
C
L
= 1µF
I
O
= 1mA
I
O
= 100mA
70
I
L
= 0
0
-50
mV
~
~
8V
6V
4V
0
200
400
TIME(µs)
C
L
= 1µF
I
L
= 1mA
V
OUT
= 5V
60
50
40
30
20
10
1
10
2
10
3
10
4
10
5
10
6
C
L
= 1µF
V
IN
= 6V
V
OUT
= 5V
I
L
= 100µA
600
800
FREQUENCY (Hz)
FREQUENCY (Hz)
Line Transient Response
90
80
RIPPLE REJECTION (dB)
Output Impedance
80
I
L
= 50mA
Ripple Rejection
2.3
RIPPLE REJECTION (dB)
70
60
50
40
30
20
10
1
I
L
= 1mA
60
50
40
30
20
I
L
= 100mA
MINIMUM OPERATING VOLTAGE (V)
C
L
= 1µF
V
IN
= 6V
V
OUT
= 5V
70
2.1
C
L
= 1µF
V
IN
= 6V
V
OUT
= 5V
1.9
I
L
= 10mA
10
10
2
10
3
10
4
10
5
10
6
10
1
10
2
10
3
10
4
10
5
10
6
1.7
-75
-50 -25
0
25
50
75 100 125 150
FREQUENCY (Hz)
FREQUENCY (Hz)
TEMPERATURE
Ripple Rejection
Ripple Rejection
Minimum Operating Voltage
Rev. 10/11/02
SPX1121 150mA Low DropoutVoltage Regulator
© Copyright 2002 Sipex Corporation
4
TYPICAL PERFORMANCE CHARACTERISTICS
(CONT.)
250
200
150
LOAD OUTPUT VOLTAGE
CURRENT CHANGE (mV)
LOAD OUTPUT VOLTAGE
CURRENT CHANGE (mV)
80
60
40
OUTPUT CURRENT (mA)
120
100
80
60
40
20
0
0
4
8
12
16
20
0
5
10
15
20
25
30
TIME (ms)
INPUT VOLTAGE (V)
T
A
= 85 ºC
TO-92 PACKAGE
0.25" LEADS SOLDERED
TO PC BOARD
Vout=5V
T
JMAX
= 125 ºC
100
50
0
-50
-100
~
~
C
L
= 1µF
V
OUT
= 5V
20
0
-20
-40
-60
~
~
C
L
= 10µF
V
OUT
= 5V
T
A
=25 ºC
100
µA
mA
100
100
100
0
1
2
TIME (ms)
µA
µA
3
4
5
Load Transient Response
Load Transient Response
Maxium Rated Output
30
5
OUTPUT VOLTAGE
CHANGE (mV)
OUTPUT VOLTAGE CHANGE (mV)
4
2
0
-2
25
20
15
10
5
0
~
~
10
5
0
-5
-10
5
10
15
20
T
J
= 125 ºC
T
J
= 150 ºC
I
L
= 100µA
I
L
= 1mA
POWER
DISSIPATION (W)
~
~
1
1.25W
I
L
= 100µA
0
-1
0
10
20
30
40
50
TIME (µs)
25
30
INPUT VOLTAGE (V)
Thermal Response
Line Regulation
Rev. 10/11/02
SPX1121 150mA Low DropoutVoltage Regulator
© Copyright 2002 Sipex Corporation
5
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