®
SPX2950/SPX2951
150mA Low Dropout Voltage Regulator
FEATURES
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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 1µF for Stability
Offered in TO-92 (SPX2950) and SOIC
(SPX2951)
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Direct Replacement for LP2950/LP2951
SPX2951 versions only
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Error Flag Warns of Output Dropout
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Logic-Controlled Electronic Shutdown
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Output Programmable From 1.24 to 30V
APPLICATIONS
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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
DESCRIPTION
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 100µA 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.
UNREGULATED DC
5V
7
FEEDBACK
+
8
INPUT
1
OUTPUT
2
SENSE
+
_
FROM
CMOS OR
TTL
180kΩ
6
ERROR
AMPLIFIER
5V TAP
3
SHUTDOWN
60 mV
330kΩ
+
60kΩ
+
5
______
ERROR
+
_
ERROR DETECTION
COMPARATOR
1µF
.
.
TO CMOS OR
TTL
+
1.23V
4
REFERENCE
GROUND
Block Diagram of SPX2951, 8 Lead 5V Version
Rev. 3/6/03
SPX2950/SPX2951 150mA Low Dropout Voltage Regulator
©Copyright 2003 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 ........................................................ -0.3V to +30V
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
=100µA, C
L
=1µF (note 2) T
A
=25°C, unless otherwise specified. Boldface applies over the full
operating temperature range.
PARAMETER
CONDITIONS
MIN
TYP
SPX2950AC
SPX2951AC
3.3V Version
Output Voltage
T
J
=25°C
-25°C≤T
J
≤85°C
Full Operating Temperature
100µA≤ I
L
≤150mA
T
J
≤T
JMAX
T
J
=25°C
-25°C≤T
J
≤85°C
Full Operating Temperature
100µA≤I
L
≤150mA
T
J
≤T
JMAX
(Note1)
V
O
+1V
≤
V
IN
≤
30V (Note 4)
I
L
=100µA
I
L
=100mA
I
L
=150mA
I
L
=100µA
I
L
=100mA
I
L
=150mA
V
OUT
=0
C
L
=1µF
C
L
=200µF
C
L
=3.3µF, Bypass=0.01µF
from pin 7 to pin1 (SPX2951)
1.220
Over Temperature (Note 6)
1.190
40
20
0.1
3.284
3.267
3.260
3.254
3.3
3.3
3.3
3.3
3.317
3.333
3.340
3.346
3.267
3.251
3.324
3.221
3.3
3.3
3.3
3.3
3.333
3.350
3.366
3.379
V
MAX
MIN
TYP
SPX2950C
SPX2951C
MAX
UNITS
Output Voltage
5.0V Version
Output Voltage
V
4.975
4.950
4.940
4.925
5.0
5.0
5.0
5.0
5.025
5.050
5.060
5.075
4.950
4.925
4.900
4.880
5.0
5.0
5.0
5.0
5.050
5.075
5.100
5.120
V
Output Voltage
All Voltage Options
Output Voltage
Temperature Coefficient
Line Regulation (Note 3)
Dropout Voltage (Note5)
V
20
0.03
0.04
20
270
300
150
3
5
230
0.05
430
160
100
SPX2951AC
1.235
100
0.1
0.1
80
450
500
170
6
8
0.2
50
0.04
0.1
20
270
300
150
3
5
230
0.05
430
160
100
SPX2951C
1.210
1.185
40
50
0.1
1.235
150
0.2
0.2
80
450
500
170
6
8
0.2
ppm/°C
%
%
mV
mV
mV
µA
mA
mA
mA
%/W
µVrms
µVrms
µVrms
Load Regulation (Note 3) 100µA≤I
L
≤150mA
Ground Current
Current Limit
Thermal Regulation
Output Noise,
10Hz to 100kHz
8-Pin Version only
Reference Voltage
Reference Voltage
Feedback Pin Bias Current
Reference Voltage
Temperature Coefficient
Feedback Pin Bias Current
Temperature Coefficient
1.250
1.270
60
1.260
1.285
60
V
V
nA
ppm/°C
nA/°C
Rev. 3/6/03
SPX2950/SPX2951 150mA Low Dropout Voltage Regulator
©Copyright 2003 Sipex Corporation
2
ELECTRICAL CHARACTERISTICS: Continued
Electrical characteristics at V
IN
= V
O
+1V, I
L
=100µA, C
L
=1µF (note 2) T
A
=25°C, unless otherwise specified.
Boldface
applies over
the full operating temperature range.
PARAMETER
Error Comparator
Output Leakage Current
Output Low Voltage
V
0H
=30V
V
IN
=V
O
-0.5V
I
0L
=400µA
40
0.01
150
60
75
15
1.3
2.0
30
400
3
50
800
10
0.7
2.0
30
400
3
50
800
10
95
1
250
40
0.01
150
60
75
15
1.3
0.7
95
1
250
µA
mV
mV
mV
mV
V
V
µA
µA
µA
CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
Upper Threshold Voltage (Note 7)
Lower Threshold Voltage (Note 7)
Hysteresis
Shutdown Input
Input Logic Voltage
Low (Regulator ON)
High (Regulator OFF)
(Note 7)
Shutdown Pin Input Current V
S
=2.4V
V
S
=30V
Regulator Output Current (Note 8)
in Shutdown
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
= 100µA and C
L
= 1µF.
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,
100µA≤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.
Rev. 3/6/03
SPX2950/SPX2951 150mA Low Dropout Voltage Regulator
©Copyright 2003 Sipex Corporation
3
TYPICAL PREFORMANCE 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
Quiescent 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
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. 3/6/03
SPX2950/SPX2951 150mA Low Dropout Voltage Regulator
©Copyright 2003 Sipex Corporation
4
TYPICAL PREFORMANCE CHARACTERISTICS: (Continued)
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
8
V
OUT
= 5V
Drop-Out Voltage
2.5
T
A
= 125ºC
Short Circuit Current
100
mV
50
mV
INPUT OUTPUT VOLTAGE
VOLTAGE CHANGE
6
COMPARATOR OUTPUT (V)
SINK CURRENT (mA)
2.0
4
HYSTERESIS
0
-50
mV
~
~
8V
6V
4V
0
200
400
TIME(µs)
C
L
= 1µF
I
L
= 1mA
V
OUT
= 5V
1.5
T
A
= 25ºC
2
0
-2
0
1
PULLUP RESISTOR TO
SEPARATE 5V SUPPLY
1.0
T
A
= -55ºC
0.5
0.0
2
3
4
5
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9
OUTPUT LOW VOLTAGE (V)
INPUT VOLTAGE (V)
600
800
Error Comparator Output
10
I
O
= 100µA
SPX2951 Comparator Sink Current
90
80
RIPPLE REJECTION (dB)
Line Transient Response
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
FREQUENCY (Hz)
V
OUT
= 5V
C
L
= 1µF
I
O
= 1mA
I
O
= 100mA
70
I
L
= 0
70
60
50
40
30
20
I
L
= 1mA
C
L
= 1µF
V
IN
= 6V
V
OUT
= 5V
60
50
40
30
20
10
1
C
L
= 1µF
V
IN
= 6V
V
OUT
= 5V
I
L
= 100µA
I
L
= 10mA
10
2
10
3
10
4
10
5
10
6
10
1
10
2
10
3
10
4
10
5
10
6
FREQUENCY (Hz)
FREQUENCY (Hz)
Output Impedance
Ripple Rejection
Ripple Rejection
Rev. 3/6/03
SPX2950/SPX2951 150mA Low Dropout Voltage Regulator
©Copyright 2003 Sipex Corporation
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