1
Rev. 3/6/03
SPX2950/SPX2951 150mA Low Dropout Voltage Regulator
Copyright 2003 Sipex Corporation
SPX2950/SPX2951
DESCRIPTION
FEATURES
5.0V and 3.3V at 150mA Output
Accurate: 0.5% for SPX2950A/SPX2951A
Very Low Quiescent Current
Low Dropout Voltage: 300mV at 150mA
Extremely Tight Load and Line Regulation
Very Low Temperature Coefficient
Current & Thermal Limiting
Need Only 1
F for Stability
Offered in TO-92 (SPX2950) and SOIC
(SPX2951)
Direct Replacement for LP2950/LP2951
SPX2951 versions only
Error Flag Warns of Output Dropout
Logic-Controlled Electronic Shutdown
Output Programmable From 1.24 to 30V
The SPX2950 and SPX2951 are low power voltage regulators. These devices are an excellent choice for
use in battery-powered applications such as cordless telephones, radio control systems, and portable
computers. The SPX2950 and SPX2951 feature low quiescent current and low dropout voltage (typ. 20mV
at 100
A and 300mV at 150mA). This includes a tight initial tolerance of (0.5% for SPX2950A/SPX2951A),
extremely good load and line regulation (0.05% typ.), and very low output temperature coefficient (20ppm/
C typ.), making the SPX2950/SPX2951 useful as a low-power voltage reference.
The error flag output feature is used as a power-on reset for warning of a low output voltage, due to a falling
voltage. The logic compatible shutdown feature enables the regulator to be switched ON and OFF. The
SPX2950 is offered in a 3-pin TO-92 package compatible with other 5.0V, 3.3V regulators. The SPX2951
is availiable in an 8-lead SOIC package.
150mA Low Dropout Voltage Regulator
Block Diagram of SPX2951, 8 Lead 5V Version
INPUT
OUTPUT
UNREGULATED DC
SHUTDOWN
GROUND
ERROR
______
SENSE
TO CMOS OR
TTL
REFERENCE
ERROR DETECTION
COMPARATOR
ERROR
AMPLIFIER
1.23V
FROM
CMOS OR
TTL
+
+
+
+
+
+
60 mV
3
7
8
1
2
6
5
4
60k
330k
180k
.
.
1
F
_
_
FEEDBACK
5V TAP
5V
APPLICATIONS
Battery Powered Systems
Cordless Telephones
Radio Control Systems
Portable/Palm Top/Notebook Computers
Portable Consumer Equipment
Portable Instrumentation
Avionics
SMPS Post-Regulator
Voltage Reference
Automotive Electronics
2
Rev. 3/6/03
SPX2950/SPX2951 150mA Low Dropout Voltage Regulator
Copyright 2003 Sipex Corporation
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 ........................................................ -0.3V to +30V
ABSOLUTE MAXIMUM RATINGS
Feedback Input Voltage ................................................ -1.5V to +30V
Shutdown Input Voltage ................................................ -0.3V to +30V
Error Comparator Output .............................................. -0.3V to +30V
ESD Rating ............................................................................ 2kV Min
ELECTRICAL CHARACTERISTICS
Electrical characteristics at V
IN
= V
O
+1V, I
L
=100
A, C
L
=1
F (note 2) T
A
=25
C, unless otherwise specified. Boldface applies over the full
operating temperature range.
PARAMETER
CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
SPX2950AC
SPX2950C
SPX2951AC
SPX2951C
3.3V Version
Output Voltage
T
J
=25
C
3.284
3.3
3.317
3.267
3.3
3.333
V
-25
C
T
J
85
C
3.267
3.3
3.333
3.251
3.3
3.350
Full Operating Temperature
3.260
3.3
3.340
3.324
3.3
3.366
Output Voltage
100
A
I
L
150mA
3.254
3.3
3.346
3.221
3.3
3.379
V
T
J
T
JMAX
5.0V Version
Output Voltage
T
J
=25
C
4.975
5.0
5.025
4.950
5.0
5.050
V
-25
C
T
J
85
C
4.950
5.0
5.050
4.925
5.0
5.075
Full Operating Temperature
4.940
5.0
5.060
4.900
5.0
5.100
Output Voltage
100
A
I
L
150mA
4.925
5.0
5.075
4.880
5.0
5.120
V
T
J
T
JMAX
All Voltage Options
Output Voltage
(Note1)
20
100
50
150
ppm/
C
Temperature Coefficient
Line Regulation (Note 3)
V
O
+1V
V
IN
30V (Note 4)
0.03
0.1
0.04
0.2
%
Load Regulation (Note 3) 100
A
I
L
150mA
0.04
0.1
0.1
0.2
%
Dropout Voltage (Note5)
I
L
=100
A
20
80
20
80
mV
I
L
=100mA
270
450
270
450
mV
I
L
=150mA
300
500
300
500
mV
Ground Current
I
L
=100
A
150
170
150
170
A
I
L
=100mA
3
6
3
6
mA
I
L
=150mA
5
8
5
8
mA
Current Limit
V
OUT
=0
230
230
mA
Thermal Regulation
0.05
0.2
0.05
0.2
%/W
Output Noise,
C
L
=1
F
430
430
Vrms
10Hz to 100kHz
C
L
=200
F
160
160
Vrms
C
L
=3.3
F, Bypass=0.01
F
100
100
Vrms
from pin 7 to pin1 (SPX2951)
8-Pin Version only
SPX2951AC
SPX2951C
Reference Voltage
1.220
1.235
1.250
1.210
1.235
1.260
V
Reference Voltage
Over Temperature (Note 6)
1.190
1.270
1.185
1.285
V
Feedback Pin Bias Current
40
60
40
60
nA
Reference Voltage
20
50
ppm/
C
Temperature Coefficient
Feedback Pin Bias Current
0.1
0.1
nA/
C
Temperature Coefficient
3
Rev. 3/6/03
SPX2950/SPX2951 150mA Low Dropout Voltage Regulator
Copyright 2003 Sipex Corporation
PARAMETER
CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
Error Comparator
Output Leakage Current
V
0H
=30V
0.01
1
0.01
1
A
Output Low Voltage
V
IN
=V
O
-0.5V
150
250
150
250
mV
I
0L
=400
A
Upper Threshold Voltage
(Note 7)
40
60
40
60
mV
Lower Threshold Voltage
(Note 7)
75
95
75
95
mV
Hysteresis
(Note 7)
15
15
mV
Shutdown Input
Input Logic Voltage
Low (Regulator ON)
1.3
0.7
1.3
0.7
V
High (Regulator OFF)
2.0
2.0
V
Shutdown Pin Input Current V
S
=2.4V
30
50
30
50
A
V
S
=30V
400
800
400
800
A
Regulator Output Current (Note 8)
3
10
3
10
A
in Shutdown
ELECTRICAL CHARACTERISTICS: Continued
Electrical characteristics at V
IN
= V
O
+1V, I
L
=100
A, C
L
=1
F (note 2) T
A
=25
C, unless otherwise specified. Boldface applies over
the full operating temperature range.
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
= V
O
+1V, I
L
= 100
A and C
L
= 1
F.
Additional conditions for the 8-pin versions are feedback tied to 5V tap and output tied to output sense (V
OUT
= 5V)
and V
SHUTDOWN
0.8V.
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 SPX2951 is tested at I
L
= 1mA. See typical performance characteristics for line
regulation versus temperature and load current.
Note 5: Dropout voltage is defined as the input to output differential at which the output voltage drops 100mV below
its nominal value measured at 1V differential. At very low values of programmed output voltage, the minimum input
supply voltage of 2V ( 2.3V over temperature) must be taken into account.
Note 6: V
REF
V
OUT
(V
IN
-1V),2.3
V
IN
30V, 100
A
I
L
150mA, T
J
T
JMAX
.
Note 7: Comparator thresholds are expressed in terms of a voltage differential at the feedback terminal below the
nominal reference voltage measured at 6V input. To express these thresholds in terms of output voltage change,
multiply by the error amplifier gain = V
OUT
/V
REF
= (R
1
+ R
2
)/R
2.
For example, at a programmed output voltage of 5V,
the error output is guaranteed to go low when the output drops by 95mV x 5V/1.235 = 384mV. Thresholds remain
constant as a percent of V
OUT
as V
OUT
is varied, with the dropout warning occurring at typically 5% below nominal,
7.5% guaranteed.
Note 8: V
SHUTDOWN
2V, V
IN
30V, V
OUT
= 0, Feedback pin tied to 5V/ 3.3V tap.
4
Rev. 3/6/03
SPX2950/SPX2951 150mA Low Dropout Voltage Regulator
Copyright 2003 Sipex Corporation
TYPICAL PREFORMANCE 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)
Quiescent 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
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
5
Rev. 3/6/03
SPX2950/SPX2951 150mA Low Dropout Voltage Regulator
Copyright 2003 Sipex Corporation
TYPICAL PREFORMANCE CHARACTERISTICS: (Continued)
SPX2951 Comparator Sink Current
S
IN
K
C
U
R
R
E
N
T
(m
A
)
2.5
1.5
OUTPUT LOW VOLTAGE (V)
2.0
1.0
0.5
0.0
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8
0.9
T
A
= -55C
T
A
= 25C
T
A
= 125C
Line Transient Response
TIME(
s)
100
0
200
400
600
800
IN
P
U
T
O
U
T
P
U
T
VO
LTA
G
E
VO
LTA
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
Error Comparator Output
C
O
M
PA
R
AT
O
R
O
U
T
P
U
T
(V
)
8
6
0
INPUT VOLTAGE (V)
4
2
0
-2
1
2
3
4
5
V
OUT
= 5V
PULLUP RESISTOR TO
SEPARATE 5V SUPPLY
HYSTERESIS
Output Impedance
10
0.5
0.1
0.02
10
100
1K
10K
100K
1M
FREQUENCY (Hz)
O
U
TPU
T IM
PED
A
N
C
E
(O
H
M
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
IP
P
L
E
R
E
JE
C
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
IP
P
L
E
R
E
JE
C
T
IO
N
(d
B
)
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
RO
P
-O
U
T
VO
LTA
G
E
(m
V
)
500
200
0
I
L
= 150mA
I
L
= 100
A
~
~
Drop-Out Voltage
T
J
= 25C
OUTPUT CURRENT
D
RO
P
-O
U
T
VO
LTA
G
E
(m
V
)
100mA
10mA
1mA
100
A
500
400
300
200
100
0
Short Circuit Current
SH
O
RT
C
IR
C
U
IT
C
U
R
R
E
N
T
(m
A
)
240
220
200
180
-75 -50 -25
0
25
50
75 100 125 150
TEMPERATURE (C)
230
210
190
170
20
PDF 
ZIP