SPX2951CS-L-3.3 [EXAR]
Fixed/Adjustable Positive LDO Regulator, 1.24V Min, 30V Max, 0.5V Dropout, BIPolar, PDSO8, LEAD FREE, SOIC-8;
| 型号： | SPX2951CS-L-3.3 |
| 厂家： | 
EXAR CORPORATION |
| 描述： | Fixed/Adjustable Positive LDO Regulator, 1.24V Min, 30V Max, 0.5V Dropout, BIPolar, PDSO8, LEAD FREE, SOIC-8 光电二极管 输出元件 调节器 |
| 文件： | 总13页 (文件大小：137K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
®
SPX2950/SPX2951
150mA Low Dropout Voltage Regulator
TO-92 (N)
8-Pin Surface Mount (S)
FEATURES
1
2
3
1
2
8
7
INPUT
OUTPUT
SENSE
FEEDBACK
■ 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)
SHUTDOWN
3
4
6
5
5V or 3.3V Output
ERROR
V
V
IN
GROUND
OUT
GROUND
SPX2950 Bottom View
SPX2951 Top View
Now Available in Lead Free Packaging
APPLICATIONS
■ Battery Powered Systems
■ Cordless Telephones
■ Radio Control Systems
■ Portable/Palm Top/Notebook Computers
■ Portable Consumer Equipment
■ Portable Instrumentation
■ Avionics
■ Direct Replacement for LP2950/LP2951
SPX2951 versions only
■ Error Flag Warns of Output Dropout
■ Logic-Controlled Electronic Shutdown
■ Output Programmable From 1.24 to 29V
■ 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. TheSPX2950andSPX2951featurelowquiescentcurrent andlowdropoutvoltage(typ.20mV
at100µAand300mVat150mA). Thisincludesatightinitialtoleranceof(0.5%forSPX2950A/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
1
7
8
+
INPUT
FEEDBACK
OUTPUT
2
SENSE
180k
Ω
+
_
6
ERROR
FROM
CMOS OR
TTL
3
AMPLIFIER
330k
Ω
5V TAP
SHUTDOWN
+
60 mV
60k
Ω
1µF
.
5
______
ERROR
+
+
_
.
ERROR DETECTION
COMPARATOR
TO CMOS OR
TTL
1.23V
+
4
REFERENCE
GROUND
Block Diagram of SPX2951, 8 Lead 5V Version
DATE: 12/01/04
SPX2950/SPX2951 150mA 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 ........................................................ -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 VIN = VO+1V, IL=100µA, CL=1µF (note 2) TA=25°C, unless otherwise specified. Boldface applies over the full
operating temperature range.
PARAMETER
CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
SPX2950AC
SPX2951AC
SPX2950C
SPX2951C
3.3V Version
Output Voltage
TJ=25°C
3.284
3.267
3.3
3.3
3.3
3.317
3.333
3.340
3.267
3.251
3.324
3.3
3.3
3.3
3.333
3.350
3.366
V
V
-25°C≤TJ≤85°C
Full Operating Temperature 3.260
Output Voltage
100µA≤ IL ≤150mA
TJ≤TJMAX
3.254
3.3
3.346
3.221
3.3
3.379
5.0V Version
Output Voltage
TJ=25°C
4.975
4.950
5.0
5.0
5.0
5.025
5.050
5.060
4.950
4.925
4.900
5.0
5.0
5.0
5.050
5.075
5.100
V
V
-25°C≤TJ≤85°C
Full Operating Temperature 4.940
Output Voltage
100µA≤IL≤150mA
TJ≤TJMAX
4.925
5.0
5.075
4.880
5.0
5.120
All Voltage Options
Output Voltage
(Note1)
20
100
50
150
ppm/°C
Temperature Coefficient
Line Regulation (Note 3) VO+1V ≤ VIN ≤ 30V (Note 4)
Load Regulation (Note 3) 100µA≤IL≤150mA
0.03
0.04
0.1
0.1
0.04
0.1
0.2
0.2
%
%
Dropout Voltage (Note5) IL=100µA
20
80
20
80
mV
mV
mV
IL=100mA
IL=150mA
270
300
450
500
270
300
450
500
Ground Current
IL=100µA
IL=100mA
IL=150mA
150
3
170
6
150
3
170
6
µA
mA
mA
5
8
5
8
Current Limit
VOUT=0
230
230
mA
Thermal Regulation
0.05
0.2
0.05
0.2
%/W
Output Noise,
CL=1µF
430
160
100
430
160
100
µVrms
µVrms
µVrms
10Hz to 100kHz
CL=200µF
CL=3.3µF, Bypass=0.01µF
from pin 7 to pin1 (SPX2951)
8-Pin Version only
Reference Voltage
SPX2951AC
SPX2951C
1.220
Over Temperature (Note 6) 1.190
1.235
1.250
1.270
60
1.210
1.185
1.235
1.260
1.285
60
V
V
Reference Voltage
Feedback Pin Bias Current
40
20
40
50
nA
Reference Voltage
ppm/°C
Temperature Coefficient
Feedback Pin Bias Current
Temperature Coefficient
0.1
0.1
nA/°C
DATE: 12/01/04
SPX2950/SPX2951 150mA Low Dropout Voltage Regulator
©Copyright 2004 Sipex Corporation
2
ELECTRICAL CHARACTERISTICS: Continued
Electrical characteristics at VIN
= VO+1V, IL=100µA, CL=1µF (note 2) TA=25°C, unless otherwise specified. Boldface applies over
the full operating temperature range.
PARAMETER
CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
Error Comparator
Output Leakage Current V0H=30V
0.01
150
1
0.01
150
1
µA
Output Low Voltage
VIN=VO-0.5V
0L=400µA
250
250
mV
I
Upper Threshold Voltage (Note 7)
Lower Threshold Voltage (Note 7)
40
60
75
15
40
60
75
15
mV
mV
mV
95
95
Hysteresis
(Note 7)
Shutdown Input
Input Logic Voltage
Low (Regulator ON)
High (Regulator OFF)
1.3
0.7
1.3
0.7
V
V
2.0
2.0
Shutdown Pin Input Current VS=2.4V
VS=30V
30
50
30
50
µA
µA
400
800
400
800
Regulator Output Current (Note 8)
in Shutdown
3
10
3
10
µA
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 TJ = 25°C, VIN = VO +1V, IL = 100µA and CL = 1µF.
Additional conditions for the 8-pin versions are feedback tied to 5V tap and output tied to output sense (VOUT = 5V)
and VSHUTDOWN ≤ 0.8V.
Note3: Regulationismeasuredatconstantjunctiontemperature, usingpulsetestingwithalowdutycycle. 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 IL = 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: VREF≤VOUT≤(VIN -1V),2.3≤VIN≤30V, 100µA≤IL≤150mA, TJ≤TJMAX
.
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 = VOUT/VREF= (R1 + R2)/R2. 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 VOUT as VOUT is varied, with the dropout warning occurring at typically 5% below nominal,
7.5% guaranteed.
Note 8: VSHUTDOWN ≥ 2V, VIN ≤ 30V, VOUT = 0, Feedback pin tied to 5V/ 3.3V tap.
DATE: 12/01/04
SPX2950/SPX2951 150mA Low Dropout Voltage Regulator
©Copyright 2004 Sipex Corporation
3
TYPICAL PREFORMANCE CHARACTERISTICS
10
6
250
225
200
5
4
RL = 50kΩ
175
150
1
=50kΩ
RL
3
2
125
RL=50kΩ
RL
=
100
75
0.1
50
25
0
1
0
0.01
0
1
2
3
4
5
6
7
8
9
10
0.1
1
10
100
0
1
2
3
4
5
6
INPUT VOLTAGE (VOLTS)
LOAD CURRENT (mA)
INPUT VOLTAGE (VOLTS)
Input Current
Quiescent Current
Dropout Characteristics
6
320
280
160
150
140
130
120
110
100
90
RL=50
Ω
240
200
160
VOUT = 5V
5
IL= 1mA
IL= 0
VIN = 6V
IL = 100mA
80
70
120
80
60
50
40
30
20
10
0
4
3
40
0
0
1
2
3
4
5
6
7
8
-75
-25
0
25 50 75 100 125 150
-50
0
1
2
3
4
5
6
7
8
9 10
INPUT VOLTAGE (VOLTS)
TEMPERATURE (ºC)
INPUT VOLTAGE (VOLTS)
Ground Current
Ground Current
Input Current
190
170
150
130
8
7
6
5
4
IL=100mA
VIN =6V
L =100uA
I
3
2
1
0
-75 -50 -25
0
25 50 75 100 125 150
0
1
2
3
4
5
6
7
8
TEMPERATURE (ºC)
INPUT VOLTAGE
Ground Current
Quiescent Current
DATE: 12/01/04
SPX2950/SPX2951 150mA Low Dropout Voltage Regulator
©Copyright 2004 Sipex Corporation
4
TYPICAL PREFORMANCE CHARACTERISTICS
500
400
300
240
230
500
IL = 150mA
400
300
220
210
200
200
~
200
~
40
20
0
190
TJ = 25ºC
100
0
IL = 100µA
180
170
100µA
1mA
OUTPUT CURRENT
10mA
100mA
-75 -50 -25
0
25 50 75 100 125 150
-75 -50 -25
0
25 50 75 100 125 150
TEMPERATURE (ºC)
TEMPERATURE (ºC)
Drop-Out Voltage
Drop-Out Voltage
Short Circuit Current
8
6
4
2.5
2.0
100
mV
VOUT = 5V
TA = 125ºC
50
mV
0
1.5
1.0
TA = 25ºC
TA = -55ºC
CL = 1µF
IL = 1mA
VOUT = 5V
HYSTERESIS
-50
mV
~
2
0
~
8V
0.5
0.0
6V
4V
PULLUP RESISTOR TO
SEPARATE 5V SUPPLY
-2
0
1
2
3
4
5
0
200
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9
400
600
800
INPUT VOLTAGE (V)
OUTPUT LOW VOLTAGE (V)
TIME(µs)
Error Comparator Output
SPX2951 Comparator Sink Current
Line Transient Response
10
90
80
90
80
IO = 100µA
5
CL= 1µF
IO = 1mA
2
VIN = 6V
VOUT = 5V
70
70
60
50
40
30
20
IL = 1mA
IL = 0
IO = 100mA
1
60
50
40
0.5
0.2
VOUT = 5V
CL = 1µF
0.1
0.05
IL = 100µA
CL = 1µF
VIN = 6V
VOUT = 5V
30
20
0.02
0.01
IL = 10mA
10 4
103
10 2
10 5
106
10 1
10 2
10 3
FREQUENCY (Hz)
10 4
10 5
10 6
10
100
1K
FREQUENCY (Hz)
10K
100K
1M
10 1
FREQUENCY (Hz)
Output Impedance
Ripple Rejection
Ripple Rejection
DATE: 12/01/04
SPX2950/SPX2951 150mA Low Dropout Voltage Regulator
©Copyright 2004 Sipex Corporation
5
TYPICAL PREFORMANCE CHARACTERISTICS
20
10
50
2.3
2.1
PIN 7 DRIVEN BY EXTERNAL
SOURCE (REGULATOR RUN
0
OPEN LOOP)
-50
0
TA=1 25ºC
-100
-150
-200
-250
-10
-20
-30
TA = 25ºC
1.9
1.7
TA = 55ºC
-75 -50 -25
0
25 50 75 100 125 150
-2.0
-1.5 -1.0 -0.5
0
0.5
1.0
-75 -50 -25
0
25 50 75 100 125 150
TEMPEATURE (ºC)
FEEDBACK VOLTAGE (V)
TEMPERATURE
SPX2951 Minimum Operating Voltage
SPX2951 Feedback Bias Current
SPX2951 Feedback Pin Current
250
200
150
80
60
40
7
CL = 1µF
6
5
4
100
50
0
20
0
3
-20
2
1
0
IL = 10mA
VIN = 8V
CL = 10µF
VOUT = 5V
-50
-40
CL = 1µF
VOUT = 5V
-100
-60
CL = 10µF
V OUT = 5V
~
~
~
~
100
mA
2
0
100
µA
100
100
µA
µA
-2
0
1
2
3
4
5
-100
0
100 200 300 400 500 600 700
0
4
8
12
16
20
TIME (ms)
TIME (us)
TIME (ms)
Load Transient Response
Load Transient Response
Enable Transient
120
400
300
200
120
8-PIN
MOLDED
TO-92 PACKAGE
0.25" LEADS SOLDERED
TO PC BOARD
DIP SOLDERED
TO PC BOARD
TJMAX = 125º C
100
80
100
80
VOUT = 5V
Vout=5V
TJMAX = 125 ºC
60
60
TA = 25ºC
40
TA=25 ºC
40
20
0
TA = 50ºC
100
0
TA = 85 ºC
20
0
TA = 85ºC
0
5
10
15
20
25
30
-75 -50 -25
0
25 50 75 100 125 150
0
5
10
15
20
25
30
INPUT VOLTAGE (V)
TEMPERATURE (ºC)
INPUT VOLTAGE (V)
SPX2950 Maxium Rated Output
SPX2951 Divider Resistance
SPX2950 Maxium Rated Output Current
DATE: 12/01/04
SPX2950/SPX2951 150mA Low Dropout Voltage Regulator
©Copyright 2004 Sipex Corporation
6
TYPICAL PREFORMANCE CHARACTERISTICS
1.8
1.6
5
4
3.5
IL = 100mA
3.0
CL = 1µF
2.5
2
1.4
1.2
CL = 220µF
2.0
0
CL = 3.3µF
CBYP = 0.1µF
1.5
-2
1
~
~
1.0
0.8
1.0
1.25W
0.5
0
0.0
0.6
-1
0
10
20
30
40
50
10 2
10 3
FREQUENCY (Hz), C BYP=0.1uF
10 4
10 5
-75 -50 -25
0
25 50 75 100 125 150
TIME (µs)
TEMPERATURE (ºC)
Shutdown Threshold Voltage
Thermal Response
Output Noise
80
70
60
50
40
30
20
10
30
IL = 50mA
25
20
IL = 100µA
IL = 1mA
15
T J = 150 ºC
IL = 100mA
10
5
0
~
~
CL = 1µF
VIN = 6V
VOUT = 5V
10
T J = 125 ºC
IL = 100µA
5
0
-5
-10
10 1
10 2
10 3
FREQUENCY (Hz)
10 4
10 5
10 6
5
10
15
20
25
30
INPUT VOLTAGE (V)
Line Regulation
Ripple Rejection
DATE: 12/01/04
SPX2950/SPX2951 150mA Low Dropout Voltage Regulator
©Copyright 2004 Sipex Corporation
7
APPLICATION HINTS
EXTERNAL CAPACITORS
ThestabilityoftheSPX2950/SPX2951requires
a 1µF 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 be-
low -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 capacitor. The capacitors value may be in-
creased without limit.
4.75V
OUTPUT
VOLTAGE
_______
ERROR*
+
+
5.0V
INPUT
VOLTAGE
+
1.3V
+
At lower values of output current, less output
capacitance is required for stability. For the
currents below 10mA the value of the capacitor
can be reduced to 0.33µF and 0.1µF for 1mA.
More output capacitance is needed for the 8-pin
version at voltages below 5V since it runs the
error amplifier at lower gain. At worst case 3.3µF
or greater must be used for the condition of
150mA load at 1.23V output.
* See Application Info.
Fig. 1 ERROR Output Timing
ERROR DETECTION COMPARATOR
OUTPUT
The comparator produces a logic low output
whenever the SPX2951 output falls out of regu-
lation by more than around 5%. This is around
60mV offset divided by the 1.235 reference
voltage. This trip level remains 5% below nor-
mal regardless of the programmed output volt-
age of the regulator.
TheSPX2950/51unlikeotherlowdropoutregu-
lators will remain stable and in regulation with
no load in addition to the internal voltage di-
vider. This feature is especially important in
applicationslikeCMOSRAMkeep-alive.When
setting the output voltage of the SPX2950/51
version with external resistors, a minimum load
of 1µA is recommended
Figure1showsthetimingdiagramdepictingthe
ERROR signal and the regulator output voltage
as the SPX2951 input is ramped up and down.
TheERRORsignalbecomeslowataround1.3V
input, and goes high around 5V input (input
voltage at which VOUT = 4.75). Since the
SPX2951’s dropout voltage is load dependent,
the input voltage trip point (around 5V) will
vary with the load current. The output voltage
trip point (approx. 4.75V) does not vary with
load.
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 1µF tantalum
or aluminum electrolytic capacitor should be
placed from the input to the ground.
Instability can occur if there is stray capacitance
to the SPX2951 feedback terminal (pin 7). This
could cause more problems when using a higher
value of external resistors to set the output
voltage. This problem can be fixed by adding a
100pF capacitor between output and feedback
and increasing the output capacitor to at least
3.3µF.
The error comparator has an open-collector out-
put, which requires an external pull-up resistor.
Depending on the system requirements the re-
sistor may be returned to 5V output or other
supply voltage. In determining the value of this
resistor, note that the output is rated to sink
400µA, this value adds to battery drain in a low
battery condition. Suggested values range from
100K to 1MΩ. If the output is unused this
resistor is not required.
DATE: 12/01/04
SPX2950/SPX2951 150mA Low Dropout Voltage Regulator
©Copyright 2004 Sipex Corporation
8
PROGRAMMING THE OUTPUT
VOLTAGE OF SPX2951
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. This is the only way that
noise can be reduced on the 3 lead SPX2950 but
is relatively inefficient, as increasing the ca-
pacitor from 1µF to 220µF only decreases the
noise from 430µV to 160µVRMS for a 100kHz
bandwidth at 5V output. Noise could also be
reduced fourfold by a bypass capacitor across
R1,sinceitreducesthehighfrequencygainfrom
4 to unity. Pick
The SPX2951 may be pin-strapped for 5V using
its internal voltage divider by tying Pin 1 (out-
put) to Pin 2 (sense) and Pin 7 (feedback) to Pin
6 (5V Tap). Also, it may be programmed for any
output voltage between its 1.235V reference
and its 29V maximum rating . As seen in Figure
2, an external pair of resistors is required. Refer
to the below equation for the programming of
the output voltage:
V
OUT = VREF × (1 + R1/R2)+ IFBR1
The VREF is 1.235 and IFB is the feedback bias
current, nominally -20nA. The minimum rec-
ommended load current of 1 µA forces an upper
limit of 1.2MΩ on value of R2. If no load is
presented the IFB produces an error of typically
2% in VOUT which may be eliminated at room
temperature by trimming R1. To improve the
accuracy choose the value of R2 = 100k this
reduces the error by 0.17% and increases the
resistor program current by 12µA. Since the
SPX2951 typically draws 60µA at no load with
Pin 2 open-circuited this is a small price to pay.
CBYPASS ≅ (1 / 2πR1 × 200 Hz)
or choose 0.01µF. When doing this, the output
capacitor must be increased to 3.3µF to main-
tain stability. These changes reduce the output
noise from 430µV to 100µVRMS for a 100kHz
bandwidth at 5V output. With the bypass ca-
pacitor added, noise no longer scales with out-
put voltage so that improvements are more dra-
matic at higher output voltages.
TYPICAL APPLICATIONS
+VIN
100K
8
+VIN
______
ERROR
5
ERROR
1.24 to 29V
1
OUTPUT
VOUT
SPX2951
+
3
R1
3.3µF
SHUTDOWN
INPUT
SD
.01µF
FB
7
GND
4
1.23V
VREF
R2
Figure 2. Adjustable Regulator
DATE: 12/01/04
SPX2950/SPX2951 150mA Low Dropout Voltage Regulator
©Copyright 2004 Sipex Corporation
9
TYPICAL APPLICATIONS: (Continued)
+V IN
+V IN
8
470KΩ
8
+V IN
+V IN
______
ERROR
______
ERROR
ERROR
5
5
VOUT
*V OUT = V IN
1
1
OUTPUT
VOUT
470kΩ
VOUT
SPX2951
SPX2951
+
3
SHUTDOWN
INPUT
3
R1
1µF
SD
SD
FB
GND
FB
7
GND
4
RESET
7
4
*MINIMUM INPUT-OUTPUT VOLTAGE RANGES FROM 40mV to 400mV.
DEPENDING ON LOAD CURRENT.
R2
Figure 3. Latch Off When Error Flag Occurs
Figure 4. Wide Input Voltage Range Current Limiter
+
6V
SEALED
1.5kΩ
120kΩ
LEAD-
8
ACID
1N457
BATTERY
+VIN
SOURCE
FB
1
2
MAIN V+
SPX385
OUT
V
SPX2951
MEMORY V+
SENSE
400kΩ
+
FOR 5.5 V
3
20kΩ
1µF
SD
100kΩ
GND
4
NI-CAD
BACKUP
BATTERY
Figure 5.Low Battery Disconnect
DATE: 12/01/04
SPX2950/SPX2951 150mA Low Dropout Voltage Regulator
©Copyright 2004 Sipex Corporation
10
TYPICAL APPLICATIONS: (Continued)
39kΩ
8
2
+VIN
SENSE
+VOUT=5V
5
1
7
VOUT
ERROR
RESET
+
SPX2951
1µF
-
3
SD
C4
FB
TAP
+
GND
39kΩ
4
6
100kΩ
1%
-
C1
100kΩ
+
<5.8V**
1kΩ
1kΩ
1%
1%
-
6V
100kΩ
100kΩ
LEAD-
ACID
C2
+
BATTERY
<6.0V**
<6.2V**
-
C3
+
10kΩ
20kΩ
R1
* OPTIONAL LATCH OFF WHEN DROPOUT OCCURS.
ADJUST R3 FOR C2 SWITCHING WHEN VIN IA 6.0V
* OUTPUTS GO LOW WHEN VIN DROPS BELOW DESIGNATED THRESHOLDS
1%
Figure 6. Regulator with State-of Charge Indicator
+V IN
8
10K
Ω
.
+V IN
_______
ERROR
5
1
5 DEGREE SHUTDOWN FLAG
.
3
AUX SHUTDOW
INPUT
SD
OFF
SPX2951
ON
V
7
OUT
GND
FB
EXTERNAL CIRCUIT
PROTECTED FROM
4
OR
+
OVER TEMPERATURE
(V+ GOES OFF WHEN
TEMP > 125)
TEMP
SENSOR
AS35
RELAY
-
8.2K
Ω
Figure 7. System Over Temperature Protection
DATE: 12/01/04
SPX2950/SPX2951 150mA Low Dropout Voltage Regulator
©Copyright 2004 Sipex Corporation
11
TYPICAL APPLICATIONS: (Continued)
+5V
4.7mA
4
20mA
UNREGULATED INPUT
8
OUTPUT
8
+V IN
330kΩ
IN
1
2N5432
(2)
1
VOUT
V OUT
1N4001
27kΩ
SPX2951
SPX2951
7
0.1µF
FB
2
2
5V
6
SENSE
GND
VTAP
OUTPUT
FB
7
GND
4
+
4
4.7µF
LOAD
50mA
TO
300 mA
360K
Ω
1N457
MIN VOLTAGE = 4V
Figure 9. 300mA Regulator with 0.75V
Figure 8. Open Circuit Detector for 4mA to 20mA
Current Loop
IN
FEEDBACK
R18
Q15A
Q15B
20kΩ
3
24
Q24
Q25
3
Q26
3
OUT
Q9
SENSE
Q4
Q7
Q3
Q1
R27
R28
R11
18kΩ
R17
Q16
Q17
1
Q14
1
C1
Q5
Q8
VTAP
Q6
12kΩ
2
20pF
2
R11
20.6kΩ
Q20
Q42
Q2
10
R8
C2
40pF
31.4kΩ
Q22
R10
150
kΩ
R1
20kΩ
Q21
Q23
R5
180kΩ
R9
27.8kΩ
R13
100
kΩ
R13
100kΩ
R14
350kΩ
R6
140kΩ
3
R12
110kΩ
Q40
Q13
Q12
Q41
R16
30kΩ
Q19
Q18
Q11
R2
50kΩ
R17
10Ω
4
Q29
R30
30kΩ
Q28
R4
R3
6
13kΩ
50kΩ
R21
8Ω
R23
Q30 Q31
SHDN
ERROR
60kΩ
R22
150kΩ
R24
50kΩ
Q36
Q37
Q38
4
Q35
Q34
5
R26
60kΩ
DENOTES CONNECTION ON
LP2950 ONLY
R25
2.8kΩ
2
GND
Q39
Figure 10. Schematic Diagram
DATE: 12/01/04
SPX2950/SPX2951 150mA Low Dropout Voltage Regulator
©Copyright 2004 Sipex Corporation
12
ORDERING INFORMATION
Output Voltage
Ordering No.
Accuracy
0.5%
0.5%
0.5%
0.5%
1%
Packages
3-Pin TO-92
3-Pin TO-92
3-Pin TO-92
3-Pin TO-92
3-Pin TO-92
3-Pin TO-92
3-Pin TO-92
3-Pin TO-92
8-Pin SOIC
8-Pin SOIC
8-Pin SOIC
8-Pin SOIC
8-Pin SOIC
8-Pin SOIC
8-Pin SOIC
8-Pin SOIC
SPX2950ACN-3.3
SPX2950ACN-3.3/TR
SPX2950ACN-5.0
SPX2950ACN-5.0/TR
SPX2950CN-3.3
3.3V
3.3V
5.0V
5.0V
3.3V
3.3V
5.0V
5.0V
3.3V
3.3V
5.0V
5.0V
3.3V
3.3V
5.0V
5.0V
SPX2950CN-3.3/TR
SPX2950CN-5.0
1%
1%
SPX2950CN-5.0/TR
SPX2951ACS-3.3
SPX2951ACS-3.3/TR
SPX2951ACS-5.0
SPX2951ACS-5.0/TR
SPX2951CS-3.3
1%
0.5%
0.5%
0.5%
0.5%
1%
SPX2951CS-3.3/TR
SPX2951CS-5.0
1%
1%
SPX2951CS-5.0/TR
1%
Available in lead free packaging. To order add "-L" suffix to part number.
Example: SPX2950ACN-3.3/TR = standard; SPX2950ACN-L-3.3/TR = lead free
/TR = Tape and Reel
Pack quantity is 2500 for 8 pin NSOIC and 2,000 for TO-92.
CLICK HERE TO ORDER SAMPLES
Corporation
ANALOG EXCELLENCE
Sipex Corporation
Headquarters and
Sales Office
233 South Hillview Drive
Milpitas, CA 95035
TEL: (408) 934-7500
FAX: (408) 935-7600
Sipex Corporation reserves the right to make changes to any products described herein. Sipex does not assume any liability arising out of the
application or use of any product or circuit described herein; neither does it convey any license under its patent rights nor the rights of others.
DATE: 12/01/04
SPX2950/SPX2951 150mA Low Dropout Voltage Regulator
©Copyright 2004 Sipex Corporation
13
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