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LP2950/LP2951 100mA, LOW DROPOUT VOLTAGE REGULATORS OCTOBER 6, 2008 REV. G   •       •   •     •  •       •   •      •   •     •   •     •  •    µ   • •   Lead Free, RoHS Compliant Packages: •       •  •    •     •       •    NowAvailableinLeadFreePackaging •                                                                                                                                                                 UNREGULATED DC + 7 8  5V @M A00XmA FEEDBACK INPUT OUTPUT 2 SENSE + 80kΩ _  FCRMOOMS OR  EARMRPOLIRF IER 5V TAP 0kΩ TTL SHUTDOWN + 0 mV 0kΩ 5 µF + . + ______ _ ERROR DETECTION ERROR . + .2V COMPARATOR TTOTL CMOS OR  REFERENCE GROUND Rev G LP2950-5 Low Dropout Linear Regulators © 2008 Exar Corporation 

                                                                                                 ≤ ≤             µ ≤ ≤          ≤                 ≤ ≤                   µ ≤ ≤          ≤                    ≤ ≤             µ ≤ ≤            µ                      µ     µ                              µ   µ        µ   µ     µ      µ                                           Rev G LP2950-5 Low Dropout Linear Regulators © 2008 Exar Corporation 2

LP2950/51 CONDITIONS LP2951AC LP2951C PARAMETER (Note 2) Min. Typ. Min. Typ. Max. UNITS Max. 8-Pin Versions only (Continued) Reference Voltage 20 50 ppm/°C Temperature Coefficient Feedback Pin Bias 0.1 0.1 nA/°C Current Temperature Coefficient Error Comparator Output Leakage VOH =30V 0.01 1 0.01 1 μA Current Output Low Voltage VIN=4.5V 150 250 150 250 mV IOL= 400μA Upper Threshold (Note 7) 40 60 40 60 mV Voltage Lower Threshold (Note 7) 75 95 75 95 mV Voltage 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 Shut down Pin Input VS= 2.4V 30 50 30 50 μA Current VS= 30V 675 800 675 800 μA Regulator Output (Note 8) 3 10 3 10 μA Current in Shutdown Thermal 8 Pin SOIC 128. 4 °C/W Resistance θJA 3 Pin TO-92 131.9 °C/W Note 1: Output or reference voltage temperature coefficients defined as the worst case voltage change divided by the to tal temperature range. Note 2: Unless otherwise specified all limits guaranteed for TJ = 25°C, VIN= 6V, 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. 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 IL= 100 μA and TJ = 125°C, 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 ta ken into account. Note 6: VREF ≤VOUT ≤(VIN- 1V), 2.3 ≤VIN≤30V, 100μA≤IL≤100mA, TJ ≤TJMAX. Note 7: Comparator thresholds are expressed in terms of a voltage differential at the feedback terminal below the nomi n al 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 VOUTas 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 Tap. Note 9: All typical values are not guaranteed. The value could vary from lot to lot. Rev G LP2950-5 Low Dropout Linear Regulators © 2008 Exar Corporation 3

7      6 250 10 225 5 200 OUTPUTVOLTAGE(VOLTS) 1234 RL= 8 RL=50kΩ Iµ NPUTCURRENT(A )1111750257500505 RRLL== 850kΩ GROUNDPINCU RRENT(mA)0.11 25 0 0 0.01 0 1 2 3 4 5 6 0 1 2 3 4 5 6 7 8 9 10 0.1 1 10 100 INPUT VOLTAGE (VOLTS) INPUT VOLTAGE (VOLTS) LOAD CURRENT (mA) Dropout Characteristics Input Current Quiescent Current 320 160 16 150 280 140 GRµOUNDCUR RENT(A)21128260400000 ILIL== 1 0mA INPUTCUR RENT(mA)111132107598640000000000 VROLU=T5=0 Ω5V GROUNDCUR RENT(mA)182 ILV= IN10=0 6mVA 30 40 20 10 0 4 0 0 1 2 3 4 5 6 7 8 0 1 2 3 4 5 6 7 8 9 10 -75 -50 -25 0 25 50 75 100 125 150 INPUT VOLTAGE (VOLTS) INPUT VOLTAGE (VOLTS) TEMPERATURE (ºC) Ground Current Input Current Ground Current 16 190 14 R RENT(mA)10128 IL=100mA µ URRENT(A)170 ILV=I1N0=06uVA GROUNDCU 64 UIESCENTC150 Q 2 130 0 0 1 2 3 4 5 6 7 8 -75 -50 -25 0 25 50 75 100 125 150 INPUT VOLTAGE TEMPERATURE (ºC) Ground Current Quiescent Current Rev G LP2950-5 Low Dropout Linear Regulators © 2008 Exar Corporation 4

     600 500 170 IL= 100mA 160 500 400 A) DROP-OUTVOLTAGE(mV)14350000000~~ IL= 100µA DROP-OUTVOLTAGE(mV)321000000 TJ= 25ºC SHORTCIRCUITCURRENT(m111115312400000 0 0 110 -75 -50 -25 0 25 50 75 100 125 150 100µA 1mA 10mA 100mA -75 -50 -25 0 25 50 75 100 125 150 TEMPERATURE (ºC) OUTPUT CURRENT TEMPERATURE (ºC) Drop-Out Voltage Drop-Out Voltage Short Circuit Current 8 2.5 100 mV 6 VOUT= 5V 2.0 TA= 125ºC m50V COMPARATOROUTPUT(V) 420 HYSTERESIS SINKCURRENT(mA)110...505 TTAA== -2555ººCC INPUTOUTPUTVOLTAGEVOLTAGECHANGE-m850VV0~~ VICLOL=U= T1 =1m µ5AVF 6V PULLUP RESISTOR TO -2 SEPARATE 5V SUPPLY 0.0 4V 0 1 2 3 4 5 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 0 200 400 600 800 INPUT VOLTAGE (V) OUTPUT LOW VOLTAGE (V) TIME(µs) Error Comparator Output LP2951 Comparator Sink Current Line Transient Response 10 90 90 IO= 100µA 5 80 80 OUTPUTIMPEDANCE(OHMS)0000..01200...52521 IO= 1mA IVCOO=LU =1T 0=10 µ5mVFA RIPPLEREJECTION(dB) 4537600000 VCVLOIN=U=T 1 =6µ V5FV IL= 0IL= 100µA RIPPLEREJECTION(dB) 4376500000 IL= 1mA CVVLOIN=U =T1 =µ6 VF5V 0.01 20 20 IL= 10mA 10 100 1K 10K 100K 1M 101 102 103 104 105 106 101 102 103 104 105 106 FREQUENCY (Hz) FREQUENCY (Hz) FREQUENCY (Hz) Output Impedance Ripple Rejection Ripple Rejection Rev G LP2950-5 Low Dropout Linear Regulators © 2008 Exar Corporation 5

     2.3 20 50 PIN 7 DRIVEN BY EXTERNAL SOURCE (REGULATOR RUN 10 0 OPEN LOOP) GVOLTAGE(V)2.1 RENT(nA) 0 µURRENT(A)--15000 TA=1 25ºC N R C OPERATI1.9 BIASCU-10 EDBACK-150 TA= 25ºC MUM -20 FE-200 TA= 55ºC NI MI 1.7 -30 -250 -75 -50 -25 0 25 50 75 100 125 150 -75 -50 -25 0 25 50 75 100 125 150 -2.0 -1.5 -1.0 -0.5 0 0.5 1.0 TEMPERATURE TEMPEATURE (ºC) FEEDBACK VOLTAGE (V) LP2951 Minimum Operating Voltage LP2951 Feedback Bias Current LP2951 Feedback Pin Current 250 80 7 C= 1µF 200 60 6 L 150 40 E(V)5 LOADOUTPUTVOLTAGECURRENTCHANGE(mV)-111m-00055A000000~~ VCOLU=T 1= µ5VF LOADOUTPUTVOLTAGECURRENTCHANGE(mV)1---26024000000 ~~ VCOLU=T =1 05VµF SHUTDOWNOUTPUTNOUTV O L T A GE(V)VOLTAG432102 CL= 10µF VVILION=U= 1T 08=mV 5AV 100 1µ0A0 PI0 µA µA -2 0 1 2 3 4 5 0 4 8 12 16 20 -100 0 100 200 300 400 500 600 700 TIME (ms) TIME (ms) TIME (us) Load Transient Response Load Transient Response Enable Transient 120 400 120 8-PIN TO-92 PACKAGE MOLDED 100 0.25" LEADS SOLDERED 100 DIP SOLDERED OUTPUTCURRENT(mA) 64280000 TA= 85 ºC TO PTCJMV BAoOXu tA== RT51V2DA5= 2ºC5 ºC PIN2T OPIΩN4RESISTANCE()k213000000 OUTPUTCURRENT(mA)64820000 TA= 50ºCTA= 85ºC TTOJVM POACUXT T=B =A1O 2=5A5V 2Rº 5CDºC 0 0 0 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) LP2950 Maxium Rated Output LP2951 Divider Resistance LP2950 Maxium Rated Output Current Rev G LP2950-5 Low Dropout Linear Regulators © 2008 Exar Corporation 6

                       µ       µµµ  µ                            µ               µ    µ              µ       µ                                 Rev G LP2950-5 Low Dropout Linear Regulators © 2008 Exar Corporation 7

                         µ                                                    °                                     °     Ω                                                                                                           µ   µ                                         µ               µ                              Ω                                                                                                             µ                                                               µ    ×                                   µ                 Ω                                                                                       µ      µ       µ                                                                       µ   µ      µ  µ                                      ≅  π ×      µ               µ                µ  µ                                                                    Rev G LP2950-5 Low Dropout Linear Regulators © 2008 Exar Corporation 8

   +V IN 100K 8 ERROR 5 ______ +VIN ERROR 1 1.24 to 29V OUTPUT VOUT LP2951 + SHUTDOWN 3 R1 3.3µF SD INPUT .01µF GND FB 4 7 1.23V VREF R2     +V IN 470kΩ 8 +VIN 5 ______ +VIN 470kΩ ERROR VOUT 1 VOUT 8 ERROR 5 ______ +VIN LP2951 OUTPUT ERROR VOUT 1 *VOUT= V IN + 3 SD R1 1µF LP2951 RESET GND FB SHUTDOWN 3 SD 4 7 INPUT GND FB 4 7 R 2 *MINIMUM INPUT-OUTPUT VOLTAGE RANGES FROM 40mV to 400mV. DEPENDING ON LOAD CURRENT. CURRENT LIMIT IS TYPICALLY 150mA                 Rev G LP2950-5 Low Dropout Linear Regulators © 2008 Exar Corporation 9

    + 6V SLEEAADLE-D 120kΩ 1.5kΩ 8 ACID 1N457 BATTERY SOURCE FB +VIN SPX385 1 MAIN V+ VOUT LP2951 MEMORY V+ SENSE 400kΩ FOR 5.5 V 2 + 3 SD 1µF 20kΩ 100kΩ GND NI-CAD 4 BACKUP BATTERY        Ω                         Ω       Ω   Ω         Ω    Ω      Ω    Ω       Ω                 Ω                       Rev G LP2950-5 Low Dropout Linear Regulators © 2008 Exar Corporation 0

    +VIN 8 0KΩ. AUX SHUTDOW  SD +VIN _E_R__R_O_R_ 5 5 DEGR.EE SHUTDOWN FLAG INPUT OFF LP295 ON  VOUT GND FB EXTERNAL CIRCUIT +  7 PROTECTED FROM OR OVERTEMPERATURE (V+ GOES OFF WHEN TEMP AS5 TEMP > 25) RELAY SENSOR - 8.2KΩ       +5V .7mA UNREGULATED INPUT  20mA +VI8N  OUTPUT 8 IN VOUT  0KΩ 2N5(2)2 VOUT 27KΩ LP295 N00 LP295 7  2 5V 0.µF FB 2 VTAP SENSE FB GND OUTPUT GND 7  +.7µF LOAD 0KΩ 50mA  TO N57 00 mA MIN VOLTAGE = V                  042408 Rev F LP2950-5 Low Dropout Linear Regulator © 2008 Exar Corporation 

PACKAGE: 3 PIN TO-92 Rev G LP2950-5 Low Dropout Linea r Regulators © 2008 Exar Corporation 2

PACKAGE: 3 PIN TO-92 AMMO PACK Rev G LP2950-5 Low Dropout Linea r Regulators © 2008 Exar Corporation 3

PACKAGE: 8 PIN NSOIC Rev G LP2950-5 Low Dropout Linea r Regulators © 2008 Exar Corporation 4

ORDERING INFORMATION Output Part Number Accuracy Package Shipping Status Voltage Lead Free LP2950ACN-L-- 0.50% .V Bulk Active  Pin TO-92 Lead Free LP2950ACN-L--/TR 0.50% .V Tape & Reel Active  Pin TO-92 Lead Free LP2950ACN-L-5-0 0.50% 5.0V Bulk Active  Pin TO-92 Lead Free LP2950ACN-L-5-0/TR 0.50% 5.0V Tape & Reel Active  Pin TO-92 Lead Free LP2950CN-L-- % .V Bulk Active  Pin TO-92 Lead Free LP2950CN-L--/TR % .V Tape & Reel Active  Pin TO-92 Lead Free LP2950CN-L-5-0 % 5.0V Bulk Active  Pin TO-92 Lead Free LP2950CN-L-5-0/TR % 5.0V Tape & Reel Active  Pin TO-92 Lead Free LP295ACS-L-- 0.50% .V Bulk Active 8 Pin SOIC Lead Free LP295ACS-L--/TR 0.50% .V Tape & Reel Active 8 Pin SOIC Lead Free LP295ACS-L-5-0 0.50% 5.0V/ADJ Bulk Active 8 Pin SOIC Lead Free LP295ACS-L-5-0/TR 0.50% 5.0V/ADJ Tape & Reel Active 8 Pin SOIC Lead Free LP295CS-L-- % .V Bulk Active 8 Pin SOIC Lead Free LP295CS-L--/TR % .V Tape & Reel Active 8 Pin SOIC Lead Free LP295CS-L-5-0 % 5.0V/ADJ Bulk Active 8 Pin SOIC Lead Free LP295CS-L-5-0/TR % 5.0V/ADJ Tape & Reel Active 8 Pin SOIC Rev G LP2950-5 Low Dropout Linea r Regulators © 2008 Exar Corporation 5   +V IN 100K 8 +V ______ ERROR IN 5 1.24 to 2 9V ERROR 1 OUTPUT V OUT LP2951 + SHUTDOWN R 3 3.3 F µ 1 SD .01 F µ INPUT FB GND 7 4 1.23V R V 2 REF     +V IN +V IN 470k Ω 8 +V ______ IN 5 V ERROR OUT 1 8 V 470k Ω OUT +V ______ ERROR IN 5 ERROR *V = V LP2951 1 IN OUT OUTPUT V OUT + LP2951 R 3 1 F µ 1 SD FB GND 3 RESET SHUTDOWN SD 7 INPUT 4 FB GND 7 4 R 2 *MINIMUM INPUT-OUTPUT VOLTAGE RANGES FROM 40mV to 400mV. DEPENDING ON LOAD CURRENT. CURRENT LIMIT IS TYPICALLY 150mA                

ORDERING INFORMATION (continued) Output Part Number Accuracy Package Shipping Status Voltage LP2950ACN-- 0.50% .V  Pin TO-92 Bulk EOL LP2950ACN-5-0 0.50% 5.0V  Pin TO-92 Bulk EOL LP2950CN-- % .V  Pin TO-92 Bulk EOL LP2950CN--/TR % .V  Pin TO-92 Tape & Reel EOL LP2950CN-5-0 % 5.0V  Pin TO-92 Bulk EOL LP2950CN-5-0/TR % 5.0V  Pin TO-92 Tape & Reel EOL LP295ACS-- 0.50% .V 8 Pin SOIC Bulk EOL LP295ACS-5-0 0.50% 5.0V/ADJ 8 Pin SOIC Bulk EOL LP295CS-- % .V 8 Pin SOIC Bulk EOL LP295CS--/TR % .V 8 Pin SOIC Tape & Reel EOL LP295CS-5-0 % 5.0V/ADJ 8 Pin SOIC Bulk EOL LP295CS-5-0/TR % 5.0V/ADJ 8 Pin SOIC Tape & Reel EOL LP2950ACN--/TR 0.50% .V  Pin TO-92 Tape & Reel OBS LP2950ACN-5-0/TR 0.50% 5.0V  Pin TO-92 Tape & Reel OBS LP295ACS--/TR 0.50% .V 8 Pin SOIC Tape & Reel OBS LP295ACS-5-0/TR 0.50% 5.0V/ADJ 8 Pin SOIC Tape & Reel OBS Exar Corporation Headquarters and Sales Office 48720 Kato Road Fremont, CA 94538 main: 510-668-7000 fax: 510-668-7030 EXAR Corporation reserves the right to make changes to the products contained in this publication in order to improve design, performance or reliability. EXAR Corporation assumes no responsibility for the use of any circuits described herein, conveys no license under any patent or other right, and makes no representation that the circuits are free of patent infringement. Charts and schedules contained here in are only for illustration purposes and may vary depending upon a user’s specific application. While the information in this publication has been carefully checked; no responsibility, however, is assumed for inaccuracies. EXAR Corporation does not recommend the use of any of its products in life support applications where the failure or malfunction of the product can reasonably be expected to cause failure of the life support system or to significantly affect its safety or effectiveness. Products are not authorized for use in such applications unless EXAR Corporation receives, in writing, assurances to its satisfaction that: (a) the risk of injury or damage has been minimized; (b) the user assumes all such risks; (c) potential liability of EXAR Corporation is adequately protected under the circumstances. Rev G LP2950-5 Low Dropout Linea r Regulators © 2008 Exar Corporation 6

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