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SPX2954
250mA Low Dropout Voltage Regulator
FEATURES 5.0V and 3.3V Versions at 250mA Output Accurate 0.5% for SPX2954A Very Low Quiescent Current Low Dropout: 310mV at 250mA Extremely Tight Load and Line Regulation Very Low Temperature Coefficient Current and Thermal Limiting Need only 1F for Stability Direct Replacement for LP2954 Offered in TO-92, TO-263, SOT-223, TO-220 and SOIC 8 Pin Versions Only Error Flag Warns of Output Dropout Logic-Controlled Electronic Shutdown Programmable Output from 1.24V to 30V
+V IN
100K ERROR OUTPUT
5
8
______ ERROR
+V IN V OUT
1
1.2 to 30V
SPX2954
SHUTDOWN INPUT
3
SD GND
4
R1 FB
7
+
3.3F .01F
1.23V
V REF
R2
Adjustable Regulator
DESCRIPTION The SPX2954 and SPX2954A 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 SPX2954 and SPX2954A feature low quiescent current and low dropout voltage (typ. 20mV at 100A and 310mV at 250mA). This includes a tight initial tolerance (0.5% for SPX2954A), extremely good load and line regulation (0.05% typ.), and very low output temperature coefficient (20 ppm/C typ.), making the SPX2954/SPX2954A 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 input voltage. The logic-compatible shutdown feature enables the regulator to be switched ON and OFF. The SPX2954/SPX2954A is offered in 3-pin TO-92, TO-263, SOT-223 and TO-220 packages, and 8 pin SOIC package.
TO-263-3 Package (T)
TO-263-5 Package (T5)
8-Pin Surface Mount (S)
1 2 SPX2954 8 7 6 5 INPUT FEEDBACK 5V, 3.3V TAP
OUTPUT
TO-92 (N) 1 2 3
SOT-223 Package (M3)
TO-220-3 Package (U) TO-220-5 Package (U5)
OUTPUT
SPX2954 1 2 3 1 SPX2954 SENSE
SPX2954
1 INPUT GND 2 3
SHUTDOWN 1) INPUT 3 2345 2) OUTPUT GND 3) GND4
4) SHUTDOWN 5) ERROR Top View
SPX2954
SPX2954 1) INPUT 2) OUTPUT
ERROR
Bottom View
VIN GND VOUT Front View
123 VIN GND VOUT 1 2 34 5
3) GND 4) SHUTDOWN 5) ERROR
V IN
GND
V OUT
Top View
Top View
Front View
Front View
Pin Connections
Rev. 3/6/03 SP2954 250mA Low Dropout Voltage Regulator (c) Copyright 2003 Sipex Corporation
1
ABSOLUTE MAXIMUM RATINGS
Power Dissipation........................................Internally Limited Lead Temperature (soldering, 5 seconds) ................260C Storage Temperature Range........................-65C to +150C Operating Junction Temperature Range......-40C to +125C 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
PARAMETER 3.3 V Versions Output Voltage CONDITIONS
VIN=VO + 1V, IL=100A, CL=1F (NOTE 2), TA = 25C, unless otherwise specified.
SPX2954A MIN. 3.284 3.267 3.260 3.251 TYP. 3.3 3.3 3.3 3.3 MAX 3.317 3.333 3.340 3.350
SPX2954 MIN. TYP. MAX. 3.267 3.251 3.234 3.201 3.3 3.3 3.3 3.3 3.333 3.350 3.366 3.399 UNIT V
TJ=25C -25CTJ85C Full Operating Temp. 100A IL 250 mA TJ TJMAX TJ = 25C -25C TJ 85C Full Operating Temp. 100A IL 250 mA TJ TJMAX (NOTE 1)
Output Voltage 5 V Versions 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 4.850
5.0 5.0 5.0 5.0
5.050 5.075 5.100 5.150
V
Output Voltage All Voltage Options Output Voltage Temperature Coefficient
V
20 0.03 0.04 60 290 310 150 3 10 270 0.05 430 160 100
100 0.10 0.20 100 450 500 170 6 14 550 0.2
50 0.04 0.10 60 290 310 150 3 10 270 0.05 430 160 100
150 0.20 0.30 100 450 500 170 6 14 550 0.2
ppm/C % % mV
Line Regulation (NOTE 3) VO+1VVIN30V | (NOTE 4) Load Regulation (NOTE 3) 100 AIL250 mA Dropout Voltage (NOTE 5) Ground Current IL = 1mA IL = 100 mA IL = 250 mA IL = 1mA IL = 100 mA IL = 250 mA VOUT = 0 CL = 1F CL = 200 F CL = 3.3 F, Bypass= 0.01F from Pin 7 to Pin 1 (8 pin Versions) 8-Pin Versions only Reference Voltage Reference Voltage Feedback Pin Bias Current Vref Temperature Coefficient Feedback IBIAS Temperature Coefficient Over Temp (NOTE 6) 1.220 1.190
A mA mA mA %/W V rms V rms V rms
Current Limit Thermal Regulation Output Noise, 10Hz to 100kHz
1.235 40 20 0.1
1.250 1.270 60
1.210 1.235 1.260 1.185 40 50 0.1 1.285 60
V V nA ppm/C nA/C
Rev. 3/6/03
SP2954 250mA Low Dropout Voltage Regulator
(c) Copyright 2003 Sipex Corporation
2
ELECTRICAL CHARACTERISTICS (Cont.)
PARAMETER Error Comparator Output Leakage Current Output Low Voltage Upper Threshold Voltage Lower Threshold Voltage Hysteresis Shutdown Input logic Voltage Shutdown Input Current Low (Regulator ON) High (Regulator OFF) VS = 2.4V VS= 30V VOH = 30V VIN = VO-0.5V, IOL = 400A (NOTE 7) (NOTE 7) (NOTE 7) CONDITIONS
VIN=VO+1V, IL=100A, CL=1F (NOTE 2), TA = 25C, unless otherwise specified.
SPX2954A MIN. TYP. 0.01 150 40 60 75 15 1.3 2.0 30 400 3 50 800 10 0.7 2.0 95 MAX 1 250 40
SPX2954 MIN. TYP. MAX. 0.01 150 60 75 15 1.3 30 400 3 0.7 50 800 10 95 1 250 UNIT A mV mV mV mV V A A
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 guaranteed for TJ = 25C, VIN = 6V, IL = 100A and CL = 1F. 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. 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 SPX2954 is tested at IL = 1mA. 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 VIN30V, 100AIL 250mA, 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 95 mV x 5V/1.235 = 384 mV. 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.
UNREGULATED DC
5V 7
FEEDBACK
+
8
INPUT
1
OUTPUT
2
SENSE
+ _
FROM CMOS OR TTL
180k 6
ERROR AMPLIFIER 5V TAP
3
SHUTDOWN 60 mV
330k +
60k
+
5
______ ERROR
+ _
ERROR DETECTION COMPARATOR
1F . .
TO CMOS OR TTL
+ 1.23V
4
REFERENCE GROUND
SPX2954 Block Diagram, 8 Lead 5V Version
Rev. 3/6/03
SP2954 250mA Low Dropout Voltage Regulator
(c) Copyright 2003 Sipex Corporation
3
TYPICAL PERFORMANCE CHARACTERISTICS
6 5
OUTPUT VOLTAGE (VOLTS) INPUT CURRENT (A)
250 225
R L = 50k
10
4
R L =50k
175 150 125 100 75 50 25 0
GROUND PIN CURRENT (mA)
200
1
3
R L =50k
2 1 0 0 1 2 3 4 5 6
INPUT VOLTAGE (VOLTS)
RL =
8
0.1
0
1
2
3
4
5
6
7
8
9 10
0.01 0.1
1
10
100
INPUT VOLTAGE (VOLTS)
LOAD CURRENT (mA)
Dropout Characteristics
Input Current
Quiescent Current
320 280
GROUND CURRENT (A) INPUT CURRENT (mA)
240 200 160
IL= 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 VOUT = 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 (C)
INPUT VOLTAGE (VOLTS)
INPUT VOLTAGE (VOLTS)
Ground Current
8 7
Input Current
190
Ground Current
QUIESCENT CURRENT (A)
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 (C)
Ground Current
Quiescent Current
Rev. 3/6/03
SP2954 250mA Low Dropout Voltage Regulator
(c) Copyright 2003 Sipex Corporation
4
TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)
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
TJ = 25C
40 20 0 -75 -50 -25 0 25 50 75 100 125 150
I L = 100A
100 0 100A 1mA 10mA 100mA
0
25 50
75 100 125 150
TEMPERATURE (C)
OUTPUT CURRENT
TEMPERATURE (C)
Drop-Out Voltage
8
V OUT = 5V
Drop-Out Voltage
2.5
T A = 125C
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(s) C L = 1F I L = 1mA V OUT = 5V
1.5
T A = 25C
2 0 -2 0 1
PULLUP RESISTOR TO SEPARATE 5V SUPPLY
1.0
T A = -55C
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
IO = 100A
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 = 1F I O = 1mA I O = 100mA
70
IL = 0
70 60 50 40 30 20
I L = 1mA
C L = 1F V IN = 6V V OUT = 5V
60 50 40 30 20 10 1 10 2 10 3 10 4 10 5 10 6
C L = 1F V IN = 6V V OUT = 5V I L = 100A
I L = 10mA
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
SP2954 250mA Low Dropout Voltage Regulator
(c) Copyright 2003 Sipex Corporation
5
TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)
2.3 20 50 0
FEEDBACK CURRENT (A)
PIN 7 DRIVEN BY EXTERNAL SOURCE (REGULATOR RUN OPEN LOOP)
MINIMUM OPERATING VOLTAGE (V)
10
BIAS CURRENT (nA)
2.1
-50 -100 -150 -200 -250
TA=1 25C
0
-10
1.9
T A = 25C T A = 55C
-20
1.7 -75
-30 -50 -25 0 25 50 75 100 125 150 -75 -50 -25 0 25 50 75 100 125 150
TEMPERATURE TEMPEATURE (C)
-2.0
-1.5
-1.0
-0.5
0
0.5
1.0
FEEDBACK VOLTAGE (V)
Minimum Operating Voltage
Feedback Bias Current
Feedback Pin Current
250 200 150
LOAD OUTPUT VOLTAGE CURRENT CHANGE (mV) LOAD OUTPUT VOLTAGE CURRENT CHANGE (mV)
80 60 40 20 0 -20 -40 -60
~ ~ C L = 10F V OUT = 5V
7 6
SHUTDOWN OUTPUT PINOUT VOLTAGE (V) VOLTAGE (V)
C L = 1F
5 4 3 2 1 0 2 0 -2 -100 0 100 200 300 400 500 600 700
TIME (us) C L = 10F I L = 10mA V IN = 8V V OUT = 5V
100 50 0 -50 -100
~ ~ C L = 1F V OUT = 5V
100
A
mA
100
100 0 1 2
TIME (ms)
A A
100 3 4 5
0
4
8
12
16
20
TIME (ms)
Load Transient Response
Load Transient Response
Enable Transient
120 100
OUTPUT CURRENT (mA)
TO-92 PACKAGE 0.25" LEADS SOLDERED TO PC BOARD Vout=5V T JMAX = 125 C
400
120
8-PIN MOLDED
PIN 2 TO PIN 4 RESISTANCE (k)
100 300
OUTPUT CURRENT (mA)
80 60 40 20 0 0 5 10 15
T A = 85 C
80 60
DIP SOLDERED TO PC BOARD T JMAX = 125 C V OUT = 5V
200
T A = 25C
T A =25 C
40 20
T A = 50C T A = 85C
100
0 20 25 30 -75 -50 -25 0 25 50 75 100 125 150
0 0 5 10 15 20 25 30
INPUT VOLTAGE (V)
TEMPERATURE (C)
INPUT VOLTAGE (V)
Maxium Rated Output
Divider Resistance
Maxium Rated Output Current
Rev. 3/6/03
SP2954 250mA Low Dropout Voltage Regulator
(c) Copyright 2003 Sipex Corporation
6
TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)
1.8
SHUTDOWN THRESHOLD VOLTAGE (V) OUTPUT VOLTAGE CHANGE (mV)
5
VOLTAGE NOISE SPECTRAL DENSITY (V/Hz)
3.5 3.0
I L = 100mA C L = 1F
1.6 1.4 1.2 1.0 0.8 0.6 -75 -50 -25 0 25 50 75 100 125 150
TEMPERATURE (C)
4 2 0 -2
2.5
C L = 220F
2.0 1.5 1.0 0.5 0.0
C L = 3.3F C BYP = 0.1F
POWER DISSIPATION (W)
~ ~ 1
1.25W
0 -1 0 10 20 30 40 50
TIME (s)
10 2
10 3
10 4
10 5
FREQUENCY (Hz), C BYP =0.1uF
Shutdown Threshold Voltage
Thermal Response
Output Noise
30
OUTPUT VOLTAGE CHANGE (mV)
80
= 50A IL=50mA I L = 100A
RIPPLE REJECTION (dB)
25 20 15 10 5 0 ~ ~ 10 5 0 -5 -10 5 10 15 20
T J = 125 C T J = 150 C
70 60 50 40 30 20 10
C L = 1F V IN = 6V V OUT = 5V I L = 100mA
I L = 1mA
I L = 100A
25
30
10 1
10 2
10 3
10 4
10 5
10 6
INPUT VOLTAGE (V)
FREQUENCY (Hz)
Line Regulation
Ripple Rejection
Rev. 3/6/03
SP2954 250mA Low Dropout Voltage Regulator
(c) Copyright 2003 Sipex Corporation
7
APPLICATIONS HINTS EXTERNAL CAPACITORS The stability of the SPX2954 requires a 1F 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 below -25C solid tantalum is recommended since the many aluminum types have electrolytes that freeze at about -30C. The ESR of about 5 or less and resonant frequency above 500kHz are the most important parameters in the value of the capacitor. The capacitors value may be increased without limit. 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 0.33F and 0.1F 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 3.3 F or greater must be used for the condition of 150mA load at 1.23V output. The SPX2954 unlike other low dropout regulators will remain stable and in regulation with no load in addition to the internal voltage divider. This feature is especially important in applications like CMOS RAM keep-alive. When setting the output voltage of the SPX2954 version with external resistors, a minimum load of 1A is recommended 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 1F tantalum or aluminum electrolytic capacitor should be placed from the input to the ground. Instability can occur if there is stray capacitance to the SPX2954 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 3.3F.
ERROR DETECTION COMPARATOR OUTPUT The comparator produces a logic low output whenever the SPX2954 output falls out of regulation by more than around 5%. This is around 60 mV offset divided by the 1.235 reference voltage. This trip level remains 5% below normal regardless of the programmed output voltage of the regulator. Figure 1 shows the timing diagram depicting the ERROR signal and the regulator output voltage as the SPX2954 input is ramped up and down. The ERROR signal becomes low at around 1.3V input, and goes high around 5V input (input voltage at which VOUT = 4.75). Since the SPX2954'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. The error comparator has an open-collector output, which requires an external pull-up resistor. Depending on the system requirements the resistor 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 400mA, this value adds to battery drain in a low battery condition. Suggested values range from 100k to 1M. If the output is unused this resistor is not required. PROGRAMMING THE VOLTAGE OF SPX2954 OUTPUT
The SPX2954 may be pin-strapped for 5V using its internal voltage divider by tying Pin 1 (output) 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 30V maximum rating using an external pair of resistors. Refer to the below equation for the programming of the output voltage: VOUT = VREF x (1 + R1/R2)+ IFBR1 The VREF is 1.235 and IFB is the feedback bias current, nominally -20nA. The minimum recommended load current of 1 A forces an
Rev. 3/6/03
SP2954 250mA Low Dropout Voltage Regulator
(c) Copyright 2003 Sipex Corporation
8
APPLICATIONS HINTS (CONT)
+V IN
upper limit of 1.2M 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 12A. Since the SPX2954 typically draws 60A at no load with Pin 2 open-circuited, this is a small price to pay. 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 SPX2954 but is relatively inefficient, as increasing the capacitor from 1F to 220 F only decreases the noise from 430V to 160VRMS for a 100kHz bandwidth at 5V output. Noise can be reduced fourfold by using a bypass capacitor across R1, since it reduces the high frequency gain from 4 to unity. Pick CBYPASS (1 / 2R1 x 200 Hz) or choose 0.01F. When doing this, the output capacitor must be increased to 3.3F to maintain stability. These changes reduce the output noise from 430V to 100VRMS for a 100kHz bandwidth at 5V output. With the bypass capacitor added, noise no longer scales with output voltage so that improvements are more dramatic at higher output voltages.
4.75V OUTPUT VOLTAGE _______ ERROR*
470K
5
8
______ ERROR
+V IN V OUT
1
V OUT
470k
SPX2954
+ 3
SD GND
4
R1 FB
7
1F
RESET
R2
Figure 2. Latch Off when Error Flag Occurs
+V IN
8
ERROR OUTPUT
5
______ ERROR
+V IN
1
V OUT
*V OUT = V IN
SPX2954
SHUTDOWN INPUT
3
SD GND
4
FB
7
*MINIMUM INPUT-OUTPUT VOLTAGE RANGES FROM 40mV to 400mV. DEPENDING ON LOAD CURRENT.
Figure 3. Wide Imput Voltage Range, Current Limiter
+ 5.0V
INPUT VOLTAGE
+ +
+ 1.3V
* See Application Info.
Figure 1. Error Output Timing
Rev. 3/6/03
SP2954 250mA Low Dropout Voltage Regulator
(c) Copyright 2003 Sipex Corporation
9
APPLICATIONS HINTS
+
6V SEALED LEADACID BATTERY SOURCE
120k FB
1.5k 1N457 8 +V IN 1
SPX385
V OUT
MAIN V+
SPX2954
FOR 5.5 V
400k 3 SD 100k GND 4
SENSE 2
+
MEMORY V+
1F
20k
NI-CAD BACKUP BATTERY
Figure 4. Low Battery Disconnect
8
2 SENS E VOUT + 1uF 1
39k
5 RESET C4 +
+V IN ______ ERROR
+VO UT = 5V
SPX2954
3
SD FB
7
39k
GND 4
TAP 6
1%
100k
C1 +
100k
6V LEADACID BATTERY
1k
1% C2 +
<5.8V** 100k
<6.0V**
1%
1k
C3 +
100k
<6.2V** 10k
R3 * OPTIONAL LATCH OFF WHEN DRO POUT OCCURS. ADJUST R3 FOR C2 SWITCHING WHEN VIN IS 6.0V * OUTPUTS GO LOW WHEN V IN DRO PS BELOW DESGNATED THRESHHOLDS 1%
20k
Figure 5. Regulator with State of Charge Indicator
Rev. 3/6/03
SP2954 250mA Low Dropout Voltage Regulator
(c) Copyright 2003 Sipex Corporation
10
APPLICATIONS HINTS
+V IN
8 AUX SHUTDOW INPUT
ON OFF
3
+V IN SD
10K .
_______ ERROR 5 5 DEGREE SHUTDOWN FLAG
.
SPX2954
V OUT GND
+
1
FB
7
4
TEMP SENSOR
AS35
-
EXTERNAL CIRCUIT PROTECTED FROM OVER TEMPERATURE (V+ GOES OFF WHEN TEMP > 125)
OR
RELAY
8.2K
Figure 6. System Over Temperature Protection
+5V 4 20mA 8 +V IN V OUT 1N4001 1 4.7mA
UNREGULATED INPUT
OUTPUT
8
IN V OUT
1
330k
2N5432 (2)
SPX2954
0.1F FB
SPX2954
7 2
6 2
27k
V TAP FB
7
SENSE GND
4 +
5V OUTPUT 4.7F LOAD 50mA TO 300 mA
GND 4 360K 1N457 MIN VOLTAGE = 4V
Figure 7. Open Circuit Detector for 4mA to 20mA Current Loop
Figure 8. 300mA Regulator with 0.75V
Rev. 3/6/03
SP2954 250mA Low Dropout Voltage Regulator
(c) Copyright 2003 Sipex Corporation
11
PACKAGES
PACKAGE: 3 Lead TO-263
0.405 0.005 (10.287 0.127)
0.055 (1.397)
0.176 0.005 (4.470 0.050 0.002 (1.270

0.127) 0.051)
0.356 (9.042

0.005 0.127) 0.600 0.025 (15.24 0.635) 0.100 0.010 (2.540 0.254)
0.103 BSC (2.616)
0.050 (1.270) 0.032 + 0.001 (0.813 + 0.025) -
0.015 (0.381
+ + -
0.003 0.074) 0 8
Rev. 3/6/03
SP2954 250mA Low Dropout Voltage Regulator
(c) Copyright 2003 Sipex Corporation
12
PACKAGE:
0.090 (2.286) Radius typ. 2 1 3
TO-92
0.145 (3.683) 0.135 (3.429) 0.055 (1.397) 0.045 (1.143)
10 typ.
BOTTOM VIEW
0.185 (4.699) 0.045 (1.143) 0.085 (2.159) Diameter
5 typ.
0.185 (4.699) 0.175 (4.445) 0.090 (2.286) typ. 5 typ. Seating Plane
0.025 (0.635) Max Uncontrolled Lead Diameter 0.500 (12.70) Min.
0.016 (0.406) 0.014 (0.356) 0.055 (1.397) 0.045 (1.143) 0.105 (2.667) 0.095 (2.413) 0.0155 (0.3937) 0.0145 (0.3683)
Rev. 3/6/03
SP2954 250mA Low Dropout Voltage Regulator
(c) Copyright 2003 Sipex Corporation
13
PACKAGE: 3 Lead TO-220
0.151D 0.002 (3.835 D 0.051) 0.408 0.013 (10.36 0.33) 0.110 0.010 (2.794 0.254)
0.180 0.005 (4.572 0.127) 0.050 0.002 (1.270 0.051)
0.250 0.010 (6.350 0.254) Tapered 1 2 Sides 0.340 0.010 (8.636 0.254)
SEATING PLANE 1.020 0.015 (25.910 0.381) 7Typ.
0.150 MIN (3.81 MIN) 0.540 0.015 (13.720 0.381)
0.410 (10.41)
0.050 TYP (1.27 TYP) 0.200 0.010 (5.080 0.254)
0.100 0.010 (2.540 0.254) 0.032 0.005 (0.813 0.127)
0.015 0.010/-0.015 (2.667 0.254/-0.381) 0.015 0.010/-0.002 (0.381 0.254/-0.051)
Rev. 3/6/03
SP2954 250mA Low Dropout Voltage Regulator
(c) Copyright 2003 Sipex Corporation
14
PACKAGE: 8 PIN PLASTIC SMALL OUTLINE (SOIC) (NARROW)
4.0 (0.158) 3.8 (0.150)
5.2 (0.205) 4.6 (0.181)
6.2 (0.244) 5.8 (0.228)
Pin 1
1.27 (0.50) BSC
1.75 (0.069) 1.35 (0.053) 0.78 (0.031) 0.61 (0.024) 5.0 (0.197) 4.8 (0.188) 0.37 (0.015) BSC 0.77 (0.030) 0.64 (0.025) 7 (4 PLCS)
45
3 -6
0.56 (0.022) 0.49 (0.019) 0.45 (0.018) 0.35 (0.014) 0.20 (0.008) 0.10 (0.004) 0.22 (0.009) 0.19 (0.007) 7 (4 PLCS)
Rev. 3/6/03
SP2954 250mA Low Dropout Voltage Regulator
(c) Copyright 2003 Sipex Corporation
15
PACKAGE: 3 Lead SOT-223
0.124 0.116
0.146 0.130
0.295 0.264
0.0905 NOM 0.181 NOM
0.041 0.033
0.067 0.028 0.264 0.248
16C 10C 0.014 0.010
0.0040 0.0008
10C Max
0.033 0.025
16C 10C
Rev. 3/6/03
SP2954 250mA Low Dropout Voltage Regulator
(c) Copyright 2003 Sipex Corporation
16
ORDERING INFORMATION
PART NUMBER ACCURACY OUTPUT VOLTAGE
........................................................ ........................................................ ........................................................ ........................................................ ........................................................ ........................................................ ........................................................ ........................................................ ........................................................ ........................................................ ........................................................ ........................................................ ........................................................ ........................................................ ........................................................ ........................................................ ........................................................ ........................................................ ........................................................ ........................................................
PACKAGE
3 3 3 3 3 3 3 3 3 3 3 3 8 8 8 8 3 3 3 3 lead lead lead lead lead lead lead lead lead lead lead lead lead lead lead lead lead lead lead lead TO-263 TO-263 TO-263 TO-263 TO-92 TO-92 TO-92 TO-92 TO-220 TO-220 TO-220 TO-220 SOIC SOIC SOIC SOIC SOT-223 SOT-223 SOT-223 SOT-223
SPX2954AT-3.3 ............................................. 0.5% ................................... 3.3V SPX2954AT-5.0 ............................................. 0.5% ................................... 5.0V SPX2954T-3.3 ................................................. 1% ..................................... 3.3V SPX2954T-5.0 ................................................. 1% ..................................... 5.0V SPX2954AN-3.3 ............................................ 0.5% ................................... 3.3V SPX2954AN-5.0 ............................................ 0.5% ................................... 5.0V SPX2954N-3.3 ................................................. 1% ..................................... 3.3V SPX2954N-5.0 ................................................. 1% ..................................... 5.0V SPX2954AU-3.3 ............................................ 0.5% ................................... 3.3V SPX2954AU-5.0 ............................................ 0.5% ................................... 5.0V SPX2954U-3.3 ................................................. 1% ..................................... 3.3V SPX2954U-5.0 ................................................. 1% ..................................... 5.0V SPX2954AS-3.3 ............................................ 0.5% ................................... 3.3V SPX2954AS-5.0 ............................................ 0.5% ................................... 5.0V SPX2954S-3.3 ................................................. 1% ..................................... 3.3V SPX2954S-5.0 ................................................. 1% ..................................... 5.0V SPX2954AM3-3.3 .......................................... 0.5% ................................... 3.3V SPX2954AM3-5.0 .......................................... 0.5% ................................... 5.0V SPX2954M3-3.3 .............................................. 1% ..................................... 3.3V SPX2954M3-5.0 .............................................. 1% ..................................... 5.0V Please consult the factory for pricing and availability on a Tape-On-Reel option.
Corporation
SIGNAL PROCESSING EXCELLENCE
Sipex Corporation Headquarters and Sales Office 233 South Hillview Drive Milpitas, CA 95035 TEL: (408) 934-7500 FAX: (408) 935-7600
Sales Office 22 Linnell Circle Billerica, MA 01821 TEL: (978) 667-8700 FAX: (978) 670-9001 e-mail: sales@sipex.com
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.
Rev. 3/6/03
SP2954 250mA Low Dropout Voltage Regulator
(c) Copyright 2003 Sipex Corporation
17

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