1
Rev. 10/11/02
SPX1121 150mA Low DropoutVoltage Regulator
Copyright 2002 Sipex Corporation
150mA Low Dropout Voltage Regulator
SPX1121
DESCRIPTION
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 1
F for Stability
Equivalent Replacement for LT1121
Industry Standard SOT-223 and TO-92
3 lead packages
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 100
A 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.
1
3
2
V
OUT
GND
SOT-223 Package (M3)
Front View
V
IN
SPX1121
Bottom View
1
3
2
OUTPUT
GND
INPUT
TO-92 (N)
+
2.2F
+
SPX1121
I
IN
I
G
I
L
5V
IN
OUT
GND
LOAD
I
IN
= I
L
+ I
G
V
OUT
0.1F
Figure 1. Fixed +5V Regulator Circuit
PACKAGES
Rev. 10/11/02
SPX1121 150mA Low DropoutVoltage Regulator
Copyright 2002 Sipex Corporation
2
ABSOLUTE MAXIMUM RATINGS
Power Dissipation........................................Internally Limited
Lead Temperature (soldering, 5 seconds) ................260
C
Storage Temperature Range........................-65
C to +150
C
PARAMETER
CONDITIONS
MIN.
TYP.
MAX
UNIT
3.3 V Versions
Output Voltage
T
J
=25
C
3.267
3.300
3.333
V
1mA
I
L
150 mA
3.217
3.300
3.382
5 V Versions
Output Voltage
T
J
= 25
C
4.950
5.000
5.050
V
1 mA
I
L
150 mA
4.880
5.000
5.120
All Voltage Options
Output Voltage
(N
OTE
1)
20
100
ppm/
C
Temperature Coefficient
Line Regulation (N
OTE
3)
6V
V
IN
30V (N
OTE
4)
0.03
0.20
%
Load Regulation (N
OTE
3)
100
A
I
L
150 mA
0.04
0.60
%
Dropout Voltage
I
L
= 100
A
20
mV
(N
OTE
5)
I
L
= 1mA
110
I
L
= 100 mA
270
I
L
= 150 mA
300
550
Ground Current
I
L
= 100
A
100
170
A
I
L
= 1mA
110
I
L
= 10mA
350
I
L
= 50mA
1
mA
I
L
= 100 mA
3
6
I
L
= 150 mA
5
10
Current Limit
V
OUT
= 0
230
500
mA
Thermal Regulation
0.05
0.20
%/W
Output Noise,
C
L
= 1
F
430
V rms
10Hz to 100kHz
C
L
= 200
F
160
V rms
ELECTRICAL CHARACTERISTICS
V
IN
=6V, I
L
=100
A, C
L
=1
F (N
OTE
2), T
A
= 25
C, unless otherwise specified. Boldface
applies over the full operating temperature ranges.
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
= 100
A and C
L
= 1
F.
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.
Operating Junction Temperature Range......-40
C to +125
C
Input Supply Voltage...........................................-0.3V to +30V
ESD Rating................................................................2kV min
3
Rev. 10/11/02
SPX1121 150mA Low DropoutVoltage Regulator
Copyright 2002 Sipex Corporation
TYPICAL PERFORMANCE CHARACTERISTICS
Input Current
IN
P
U
T
C
U
R
R
E
N
T
(
A
)
75
0
0
10
INPUT VOLTAGE (VOLTS)
R
L
= 50k
25
50
100
125
150
175
200
225
250
1
2
3
R
L
=
8
Dropout Characteristics
O
U
T
P
U
T
VO
LTA
G
E
(V
O
LT
S)
0
0
INPUT VOLTAGE (VOLTS)
1
2
3
4
5
6
1
2
3
4
5
6
R
L
=50k
R
L
=50k
4
5
6
7
8
9
LOAD CURRENT (mA)
Ground Current vs. Load Current
G
RO
U
N
D
P
IN
C
U
R
R
E
N
T
(m
A
)
10
1
0.1
0.01
0.1
1
10
100
Ground Current vs. Input Voltage
G
RO
U
N
D
C
U
R
R
E
N
T
(
A
)
320
280
0
INPUT VOLTAGE (VOLTS)
240
80
40
0
1
2
3
4
5
6
7
8
120
160
200
I
L
= 1mA
I
L
= 0
INPUT VOLTAGE (VOLTS)
Input Current
IN
P
U
T
C
U
R
R
E
N
T
(m
A
)
160
150
140
130
70
50
0
120
110
100
90
80
60
40
30
20
10
0
1
2
3
4
5
6
7
8
9 10
R
L
=50
V
OUT
= 5V
Quiescent Current
190
170
150
130
-75 -50 -25
0
25
50
75 100 125 150
TEMPERATURE (C)
Q
U
IE
SC
E
N
T
C
U
R
R
E
N
T
(
A
)
V
IN
=6V
I
L
=100uA
Ground Current
8
7
6
0
1
2
3
4
5
6
7
8
INPUT VOLTAGE
G
RO
U
N
D
C
U
R
R
E
N
T
(m
A
)
5
4
3
2
1
0
I
L
=100mA
Ground Current
6
5
4
3
-75 -50 -25
0
25
50
75 100 125 150
TEMPERATURE (C)
G
RO
U
N
D
C
U
R
R
E
N
T
(m
A
)
V
IN
= 6V
I
L
= 100mA
Rev. 10/11/02
SPX1121 150mA Low DropoutVoltage Regulator
Copyright 2002 Sipex Corporation
4
TYPICAL PERFORMANCE CHARACTERISTICS
Line Transient Response
TIME(
s)
100
0
200
400
600
800
IN
PU
T
O
U
T
PU
T
V
O
L
T
A
G
E
V
O
L
T
A
G
E
C
H
A
N
G
E
4V
6V
8V
-50
0
50
~
~
mV
mV
mV
C
L
= 1
F
I
L
= 1mA
V
OUT
= 5V
Output Impedance
10
0.5
0.1
0.02
10
100
1K
10K
100K
1M
FREQUENCY (Hz)
O
UTPUT IM
PED
ANCE (O
HM
S)
5
0.2
0.05
0.01
1
2
I
O
= 100mA
I
O
= 100
A
I
O
= 1mA
V
OUT
= 5V
C
L
= 1
F
Ripple Rejection
90
70
60
40
10
1
10
2
10
3
10
4
10
5
10
6
FREQUENCY (Hz)
R
IPPLE
R
E
JEC
T
IO
N
(dB
)
80
50
20
30
I
L
= 100
A
I
L
= 0
C
L
= 1
F
V
IN
= 6V
V
OUT
= 5V
Ripple Rejection
FREQUENCY (Hz)
R
IPPL
E
R
E
JE
C
T
IO
N
(dB
)
10
6
10
3
10
2
10
1
90
80
70
60
50
20
40
30
10
4
10
5
I
L
= 10mA
I
L
= 1mA
C
L
= 1
F
V
IN
= 6V
V
OUT
= 5V
Drop-Out Voltage
400
300
40
-75 -50 -25
0
25
50
75 100 125 150
TEMPERATURE (C)
D
R
O
P-O
U
T
V
O
L
T
A
G
E
(m
V
)
500
200
0
I
L
= 150mA
I
L
= 100
A
~
~
Drop-Out Voltage
T
J
= 25C
OUTPUT CURRENT
D
R
O
P-O
U
T
V
O
L
T
A
G
E (m
V
)
100mA
10mA
1mA
100
A
500
400
300
200
100
0
Short Circuit Current
SH
O
R
T
C
IR
C
U
IT C
U
R
R
EN
T (m
A
)
240
220
200
180
-75 -50 -25
0
25 50
75 100 125 150
TEMPERATURE (C)
230
210
190
170
20
Minimum Operating Voltage
TEMPERATURE
M
IN
IM
U
M
O
PER
A
T
IN
G
V
O
L
T
A
G
E (V
)
2.3
2.1
1.9
1.7
-75
0
75
150
-50 -25
25
50
100 125
Ripple Rejection
R
IP
P
L
E
R
E
JE
C
T
IO
N
(d
B
)
80
60
40
10
10
1
10
3
10
4
10
6
FREQUENCY (Hz)
I
L
= 50mA
I
L
= 100mA
C
L
= 1F
V
IN
= 6V
V
OUT
= 5V
70
50
30
20
10
2
10
5
5
Rev. 10/11/02
SPX1121 150mA Low DropoutVoltage Regulator
Copyright 2002 Sipex Corporation
TYPICAL PERFORMANCE CHARACTERISTICS
(CONT.)
Line Regulation
O
U
T
P
U
T
V
O
L
T
A
G
E
C
H
A
N
G
E
(m
V
)
30
25
20
10
5
INPUT VOLTAGE (V)
15
10
5
0
5
0
-5
-10
10
15
20
25
30
~
~
I
L
= 100A
I
L
= 1mA
T
J
= 150 C
T
J
= 125 C
I
L
= 100A
Thermal Response
P
O
W
E
R
O
U
T
P
U
T
V
O
L
T
A
G
E
D
IS
S
IP
A
T
IO
N
(W
) C
H
A
N
G
E
(m
V
)
4
2
1
0
TIME (s)
0
-2
0
-1
10
20
30
40
50
5
1.25W
~
~
Load Transient Response
80
20
-40
100
0
4
8
12
16
20
TIME (ms)
LO
AD OUTPUT
V
OL
T
A
GE
CURRENT CHANGE (mV)
A
100
-60
-20
0
40
60
A
C
L
= 10
F
V
OUT
= 5V
~
~
Maxium Rated Output
OUTPUT CURRENT (mA)
120
80
0
0
10
20
30
INPUT VOLTAGE (V)
25
15
5
T
A
= 85 C
T
A
=25 C
T
JMAX
= 125 C
0.25" LEADS SOLDERED
TO-92 PACKAGE
TO PC BOARD
100
60
40
20
Vout=5V
Load Transient Response
250
100
-50
100
0
1
2
3
4
5
TIME (ms)
LO
AD OUTPUT
V
OL
T
A
GE
CURRENT CHANGE (mV)
A
~
~
mA
-100
0
50
150
200
C
L
= 1
F
V
OUT
= 5V
100
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