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Solved by
LP2950/LP2951
TM
100mA Low Dropout Voltage Regulators
* * * * * * * * Lead Free, RoHS Compliant Packages: *

* * * * * * * * * *
* * *
Now Available in Lead Free Packaging

UNREGULATED DC
+
7
FEEDBACK
8
INPUT
OUTPUT
5V @ 00mA MAX
2
SENSE
FROM CMOS OR TTL
SHUTDOWN 0 mV
+ _
80k
ERROR AMPLIFIER
5V TAP
0k + 5
0k
+
+ .2V
+ _
ERROR DETECTION COMPARATOR
______ ERROR
F .
TO CMOS OR TTL
.
REFERENCE GROUND
Mar8-07 Rev E
LP2950-5 Low Dropout Linear Regulator
(c) 2007 Sipex Corporation

Mar8-07 Rev E
LP2950-5 Low Dropout Linear Regulator
(c) 2007 Sipex Corporation
2
LP2950/51
PARAMETER CONDITIONS (Note 2) 8-Pin Versions only (Continued) Reference Voltage Temperature Coefficient Feedback Pin Bias Current Temperature Coefficient Error Comparator Output Leakage Current Output Low Voltage Upper Threshold Voltage Lower Threshold Voltage Hysteresis Shutdown Input Input logic Voltage Shut down Pin Input Current Regulator Output Current in Shutdown Thermal Resistance JA Low (Regulator ON) High (Regulator OFF) VS= 2.4V VS= 30V (Note 8) 8 Pin SOIC 3 Pin TO-92 2.0 1.3 30 675 3
128. 4 131.9
LP2951AC Min. Typ. Max. 20 0.1
Min.
LP2951C Typ. Max.
UNITS
50 0.1
ppm/C nA/C
VOH = 30V VIN= 4.5V IOL= 400 A (Note 7) (Note 7) (Note 7) 40
0.01 150 60 75 15
1 250 40 95
0.01 150 60 75 15
1 250
A mV mV
95
mV mV
0.7 50 800 10
2.0
1.3 30 675 3
0.7 50 800 10
V V A A A C/W C/W
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 T J = 25C, VIN= 6V, I L= 100 A 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 V SHUTDOWN 0.8V. Note 3: Regulation is measured at constant junction temperature, using pulse testing with a low duty cycle. Changes i n output voltage due to heating effects are covered under the specification for thermal regulation. Note 4: Line regulation for the LP2951 is tested at IL= 1mA. For I L= 100 A and TJ = 125C, line regulation is guaranteed by design to 0.2%. 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 100 mV 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 VIN30V, 100AIL100mA, T J T JMAX. Note 7: Comparator thresholds are expressed in terms of a voltage differential at the feedback terminal below the nomi nal reference voltage measured at 6V input. To express these thresholds in terms of output voltage change, multiply by the error amplifier gain = V OUT/VREF= (R 1+ R 2)/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 V OUTas V OUT is varied, with the dropout warning occurring at typically 5% below nominal, 7.5% guaranteed. Note 8: VSHUTDOWN 2V, V IN 30V, V OUT=0, Feedback pin tied to 5V Tap. Note 9: All typical values are not guaranteed. The value could vary from lot to lot.
Mar8-07 Rev E
LP2950-5 Low Dropout Linear Regulator
(c) 2007 Sipex Corporation

6 5
OUTPUT VOLTAGE (VOLTS) INPUT CURRENT (A)
250 225 175 150 125 100 75 50 25 0 0 1 2 3 4 5 6 0 1 2 3 4 5 67 8 9 10
INPUT VOLTAGE (VOLTS) INPUT VOLTAGE (VOLTS) RL =
8 GROUND PIN CURRENT (mA)
10
200
4
R L=
R L = 50k
1
3
R L =50k
2 1 0
8
0.1
0.01 0.1
1
10
100
LOAD CURRENT (mA)
Dropout Characteristics
Input Current
Quiescent Current
16
320 280
GROUND CURRENT (A) INPUT CURRENT (mA)
GROUND CURRENT (mA)
240 200 160 120 80 40 0 0 1 2 3 4 5 6 7 8
I L = 1mA
IL= 0
160 150 140 130 120 110 100 90 80 70 60 50 40 30 20 10 0 0 1 2 3 4 5 6
R L =50 VOUT = 5V
12
V IN = 6V I L = 100mA
8
4 7 8 9 10 -75 -50 -25 0 25 50 75 100 125 150
INPUT VOLTAGE (VOLTS) TEMPERATURE (C)
INPUT VOLTAGE (VOLTS)
Ground Current
16 14
Input Current
190
Ground Current
QUIESCENT CURRENT (A)
GROUND CURRENT (mA)
12
I L =100mA
170
V IN =6V I L =100uA
10
8 6 4 2 0 0 1 2 3 4 5 6 7 8
INPUT VOLTAGE
150
130
-75 -50 -25
0
25 50 75 100 125 150
TEMPERATURE (C)
Ground Current
Quiescent Current
Mar8-07 Rev E
LP2950-5 Low Dropout Linear Regulator
(c) 2007 Sipex Corporation

600
I L = 100mA
SHORT CIRCUIT CURRENT (mA)
500 400
DROP-OUT VOLTAGE (mV)
170 160 150 140 130 120 110 110 -75 -50 -25
500
DROP-OUT VOLTAGE (mV)
400 300 100 50 0 -75 -50 -25 0 25 50 75 100 125 150
TEMPERATURE (C)
300
~ ~
200
TJ = 25C
I L = 100 A
100 0
100A
1mA
10mA
100mA
0
25 50 75 100 125 150
OUTPUT CURRENT
TEMPERATURE (C)
Drop-Out Voltage
8
V OUT = 5V
Drop-Out Voltage
2.5 2.0
SINK CURRENT (mA)
Short Circuit Current
100 mV
T A = 125C
INPUT OUTPUT VOLTAGE VOLTAGE CHANGE
6
COMPARATOR OUTPUT (V)
50 mV 0 -50 mV ~ ~ 8V 6V 4V 0 200 400
TIME(s) C L = 1 F I L = 1mA V OUT = 5V
4
HYSTERESIS
1.5 1.0 0.5
T A = 25C
2 0 -2 0 1
PULLUP RESISTOR TO SEPARATE 5V SUPPLY
T A = -55C
2
3
4
5
0.0 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
OUTPUT IMPEDANCE (OHMS)
LP2951 Comparator Sink Current
90 80
RIPPLE REJECTION (dB)
Line Transient Response
90 80
C L = 1F V IN = 6V V OUT = 5V
5 2 1 0.5 0.2 0.1 0.05 0.02 0.01 10
IO = 100 A I O = 1mA I O = 100mA
IL= 0
60 50 40 30 20
C L = 1 F V IN = 6V V OUT = 5V I L = 100 A
RIPPLE REJECTION (dB)
70
70 60 50 40 30 20
I L = 1mA
V OUT = 5V C L = 1 F
I L = 10mA
100
1K
10K
100K
1M
10
1
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)
FREQUENCY (Hz)
Output Impedance
Ripple Rejection
Ripple Rejection
Mar8-07 Rev E
LP2950-5 Low Dropout Linear Regulator
(c) 2007 Sipex Corporation
5

2.3 20 10
BIAS CURRENT (nA)
50 0
FEEDBACK CURRENT (A)
PIN 7 DRIVEN BY EXTERNAL SOURCE (REGULATOR RUN OPEN LOOP)
MINIMUM OPERATING VOLTAGE (V)
2.1
0 -10 -20 -30
-50 -100 -150 -200 -250
TA=1 25C T A = 25C T A = 55C
1.9
1.7 -75 -50 -25 0 25 50 75 100 125 150
TEMPERATURE
-75 -50 -25 0 25 50 75 100 125 150
TEMPEATURE (C)
-2.0
-1.5 -1.0 -0.5
0
0.5
1.0
FEEDBACK VOLTAGE (V)
LP2951 Minimum Operating Voltage
LP2951 Feedback Bias Current
LP2951 Feedback Pin Current
250 200 150
LOAD OUTPUT VOLTAGE CURRENT CHANGE (mV)
80 60
SHUTDOWN OUTPUT PINOUT VOLTAGE (V) VOLTAGE (V)
7 6 5 4 3 2 1 0 2 0 -2 0 4
TIME (ms)
C L= 1 F
40
LOAD OUTPUT VOLTAGE CURRENT CHANGE (mV)
100 50 0 -50 -100 100
A mA ~ ~ C L = 1 F V OUT = 5V
20 0 -20 -40 -60
~ ~ C L = 10 F V OUT = 5V
C L= 10 F
I L = 10mA V IN = 8V V OUT = 5V
100
100 0 1 2
TIME (ms)
100 3 4 5
A A
8
12
16
20
-100 0 100 200 300 400 500 600 700
TIME (us)
Load Transient Response
120 100
OUTPUT CURRENT (mA)
Load Transient Response
400
Enable Transient
120 100
OUTPUT CURRENT (mA)
PIN 2 TO PIN 4 RESISTANCE (k)
TO-92 PACKAGE 0.25" LEADS SOLDERED TO PC BOARD Vout=5V T JMAX = 125 C
8-PIN MOLDED DIP SOLDERED TO PC BOARD T JMAX = 125 C V OUT = 5V
300
80 60 40 20 0 0 5 10 15
T A = 85 C
80 60 40 20
T A = 50C T A = 85C
200
T A = 25C
T A =25 C
100
0 20 25 30
INPUT VOLTAGE (V)
0
TEMPERATURE (C)
-75 -50 -25 0
25 50 75 100 125 150
0
5
INPUT VOLTAGE (V)
10
15
20
25
30
LP2950 Maxium Rated Output
Mar8-07 Rev E
LP2951 Divider Resistance
LP2950-5 Low Dropout Linear Regulator
LP2950 Maxium Rated Output Current
(c) 2007 Sipex Corporation

Mar8-07 Rev E
LP2950-5 Low Dropout Linear Regulator
(c) 2007 Sipex Corporation
7

x

x

Mar8-07 Rev E
LP2950-5 Low Dropout Linear Regulator
(c) 2007 Sipex Corporation
8

+V IN
100K ERROR OUTPUT
5 ______
8
+V IN V OUT
1
ERROR
1.24 to 2 9V
LP2951
SHUTDOWN INPUT
3
SD GND
4
R1 FB
7
+
3.3F
.01F
1.23V
V REF
R2

+V IN
470k
5 ______
8
+V IN
470k
ERROR
+V IN V OUT
1
V OUT
ERROR OUTPUT
5 ______
8
+V IN V OUT
1
LP2951
3
ERROR
*V OUT = V IN
SD GND
4
R1 FB
7
+
1F
SHUTDOWN INPUT
3
LP2951
SD GND
4
RESET
FB
7
R2
*MINIMUM INPUT-OUTPUT VOLTAGE RANGES FROM 40mV to 400mV. DEPENDING ON LOAD CURRENT. CURRENT LIMIT IS TYPICALLY 150mA

Mar8-07 Rev E

(c) 2007 Sipex Corporation
LP2950-5 Low Dropout Linear Regulator
9

+ 6V SEALED LEADACID BATTERY SOURCE
120k FB
1.5k 1N457 8 +V IN V OUT 1
MAIN V+
SPX385
LP2951
FOR 5.5 V
400k 3 100k SD GND 4
SENSE
MEMORY V+
2
+
1F
20k
NI-CAD BACKUP BATTERY

Mar8-07 Rev E LP2950-5 Low Dropout Linear Regulator (c) 2007 Sipex Corporation
0

+V IN
8 AUX SHUTDOW INPUT
ON OFF
+V IN SD
0K .
_______ 5 ERROR 5 DEGREE SHUTDOWN FLAG
.
LP295
VOUT GND
+
FB
7
TEMP SENSOR
AS5
-
EXTERNAL CIRCUIT PROTECTED FROM OVER TEMPERATURE (V+ GOES OFF WHEN TEMP > 25)
OR
RELAY
8.2K

+5V 20mA 8 +V IN V OUT N00 0.F GND N57 MIN VOLTAGE = V .7mA OUTPUT
UNREGULATED INPUT
8
IN
V OUT
0K 27K
2N52 (2)
LP295
FB
LP295
7 2
V TAP FB
7
SENSE GND
2
5V OUTPUT
+
.7F
0K
LOAD 50mA TO 00 mA

Mar8-07 Rev E

(c) 2007 Sipex Corporation
LP2950-5 Low Dropout Linear Regulator
PAckAge: 3 Pin TO-92
Mar8-07 Rev E
LP2950-5 Low Dropout Linear Regulator
(c) 2007 Sipex Corporation
2
PAckAge: 8 Pin nSOic
Mar8-07 Rev E
LP2950-5 Low Dropout Linear Regulator
(c) 2007 Sipex Corporation
ORDeRing inFORMATiOn
Part number
LP2950ACN-L-- LP2950ACN-L--/TR LP2950ACN-L-5-0 LP2950ACN-L-5-0/TR LP2950CN-L-- LP2950CN-L--/TR LP2950CN-L-5-0 LP2950CN-L-5-0/TR LP295ACS-L-- LP295ACS-L--/TR LP295ACS-L-5-0 LP295ACS-L-5-0/TR LP295CS-L-- LP295CS-L--/TR LP295CS-L-5-0 LP295CS-L-5-0/TR
Solved by
Accuracy 0.50% 0.50% 0.50% 0.50% % % % % 0.50% 0.50% 0.50% 0.50% % % % %
Output Package Shipping Status Voltage
.V .V 5.0V 5.0V .V .V 5.0V 5.0V .V .V 5.0V/ADJ 5.0V/ADJ .V .V 5.0V/ADJ 5.0V/ADJ Lead Free Pin TO-92 Bulk Active Active Active Active Active Active Active Active Active Active Active Active Active Active Active Active
Lead Free Tape & Reel Pin TO-92 Lead Free Pin TO-92 Bulk
Lead Free Tape & Reel Pin TO-92 Lead Free Pin TO-92 Bulk
Lead Free Tape & Reel Pin TO-92 Lead Free Pin TO-92 Bulk
Lead Free Tape & Reel Pin TO-92 Lead Free 8 Pin SOIC Bulk
Lead Free Tape & Reel 8 Pin SOIC Lead Free 8 Pin SOIC Bulk
Lead Free Tape & Reel 8 Pin SOIC Lead Free 8 Pin SOIC Bulk
Lead Free Tape & Reel 8 Pin SOIC Lead Free 8 Pin SOIC Bulk
Lead Free Tape & Reel 8 Pin SOIC
Sipex corporation
TM
Headquarters and Sales Office 2 South Hillview Drive Milpitas, CA 9505 TEL: (08) 9-7500 FAX: (08) 95-700
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. Mar8-07 Rev E LP2950-5 Low Dropout Linear Regulator (c) 2007 Sipex Corporation
ORDeRing inFORMATiOn (continued)
Part number
LP2950ACN-- LP2950ACN-5-0 LP2950CN-- LP2950CN--/TR LP2950CN-5-0 LP2950CN-5-0/TR LP295ACS-- LP295ACS-5-0 LP295CS-- LP295CS--/TR LP295CS-5-0 LP295CS-5-0/TR LP2950ACN--/TR LP2950ACN-5-0/TR LP295ACS--/TR LP295ACS-5-0/TR
Accuracy 0.50% 0.50% % % % % 0.50% 0.50% % % % % 0.50% 0.50% 0.50% 0.50%
Output Package Shipping Status Voltage
.V 5.0V .V .V 5.0V 5.0V .V .V .V Pin TO-92 Pin TO-92 Pin TO-92 Pin TO-92 8 Pin SOIC 8 Pin SOIC Bulk Bulk Bulk Bulk Bulk Bulk Bulk Bulk EOL EOL EOL EOL EOL EOL EOL EOL EOL EOL EOL EOL OBS OBS OBS OBS
Pin TO-92 Tape & Reel Pin TO-92 Tape & Reel
5.0V/ADJ 8 Pin SOIC
8 Pin SOIC Tape & Reel
5.0V/ADJ 8 Pin SOIC .V 5.0V .V
5.0V/ADJ 8 Pin SOIC Tape & Reel Pin TO-92 Tape & Reel Pin TO-92 Tape & Reel 8 Pin SOIC Tape & Reel
5.0V/ADJ 8 Pin SOIC Tape & Reel
Solved by
Sipex corporation
TM
Headquarters and Sales Office 2 South Hillview Drive Milpitas, CA 9505 TEL: (08) 9-7500 FAX: (08) 95-700
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.
Mar8-07 Rev E
LP2950-5 Low Dropout Linear Regulator
(c) 2007 Sipex Corporation
5

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