Advanced Monolithic Systems LP2950/LP2951 handbook
Contents
1. 0 050 0 005 1 270 0 127 8 LEAD SOIC PLASTIC PACKAGE S 0 189 0 197 4 801 5 004 8 7 6 5 0 228 0 244 0 150 0 157 8791 6 197 G31039837 I 2 3 4 0 010 0 020 0 053 0 069 0 254 0 508 5 0 1 346 1 752 eye 0 004 0 010 gibst 0 101 0 254 0 008 0 010 _ s K LL Y v 1 00140019 pl lg an 0050 4 be 0 016 0 050 02550683 q 210 0 406 1 270 S SO 8 AMS DRW 042293 DIMENSION DOES NOT INCLUDE MOLD FLASH MOLD FLASH SHALL NOT EXCEED 0 006 0 152mm PER SIDE DIMENSION DOES NOT INCLUDE INTERLEAD FLASH INTERLEAD FLASH SHALL NOT EXCEED 0 010 0 254mm PER SIDE Advanced Monolithic Systems Inc 6680B Sierra Lane Dublin CA 94568 Phone 925 556 9090 Fax 925 556 9140 LP2950 LP2951 PACKAGE DIMENSIONS inches millimeters unless otherwise noted Continued 0 400 10 160 MAX is 7 8 0 25540 015 64770381 8 LEAD PLASTIC DIP PACKAGE P 0 045 0 065 0 130 0 005 gt a 1 143 1 651 8 30230 127 m HHBHH LA oi w 0 100 0 010 2 540 0 254 0 125 6 175 0 015 MIN 0 380 MIN 7 0 018 0 003 Pit 04570070 DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTUSIONS MOLD FLASH OR PROTUSIONS SHALL NOT EXCEED 0 010 0 254mm Advanced Monolithic Systems Inc 0 300 0 325 7 620 8 255 0 009 0 015 0229 0381 S 0 325 0 025 0 015 8255 40 635 8255 7 34 P 8L PDIP AMS DRW 042294 6680B Sierra La2. 10 104 10 FREQUENCY Hz OUTPUT SHUTDOWN PIN RIPPLE REJECTION dB PIN 2 TO PIN 4 RESISTANCE kQ LP2951 Enable Transient 7 3 6 C 1uF H 5 4 I1210mA d3 VS BN Vour 5V 2 C 10 uF 1 El m2 z 0 a 2 gt 100 0 100 200 300 400 500 600 700 TIME us Ripple Rejection 90 80 70 1 1mA r Giu Mac DN 60 Vour 5V 50 40 30 1 10mA 20 10 10 10 16 10 106 FREQUENCY Hz LP2951 Divider Resistance 400 300 200 100 0 75 50 25 0 25 50 75 100 125 150 TEMPERATURE C 6680B Sierra Lane Dublin CA 94568 Phone 925 556 9090 Fax 925 556 9140 LP2950 LP2951 TYPICAL PERFORMANCE CHARACTERISTICS Continued LP2951 Maximum Rated Shutdown Treshold Voltage Line Regulation Output Current 2 18 c 120 8 PIN MOLDED m 2 DIP SOLDERED 2 Le m 2 100 TO PC BOARD 5 Z t Tune 125 C o REGULATOR OFF H Voyr 5V S 14 m 5 80 a x Es a T 5 T 25 C Dai lt 5 60 2 5 Ge Ta 50 C E REGULATOR O E 1 0 gt g 40 Z E E z E 20 e 0 8 T 85 C E 3 2 0 6 0 T 75 50 25 0 25 50 75 100 125 150 5 10 20 25 30 0 5 10 15 20 25 TEMPERATURE C INPUT VOLTAGE V INPUT VOLTAGE
3. 13 3 WF Bypass 0 01 uF pins 7 to 1 LP2951 8 Pin Versions only Le LP2951AC poo eeu Remi Vie M E Has Has pun EE Eo Fo comm a ce ee Reference Voltage Temperature ppm C Coefficient Note 12 Feedback Pin Bias Current d Error Comparator Output Low Voltage 4 5V hus 400uA Fe Tekoa vo N a CS iacit Lower Threshold Voltage Note EE EE a Shutdown Input Low Regulator ON 1 3 0 7 1 3 0 7 V Input logic Voltage High Regulator OFF 5 5 V Shutdown Pin Input Current Mis 24V 30 50 30 50 HA Note 3 30V 450 600 450 600 uA Regulator Output Current in Note 1 Absolute Maximum Ratings are limits beyond which damage to the device may occur Operating Ratings are conditions under which operation of the device is guaranteed Operating Ratings do not imply guaranteed performance limits For guaranteed performance limits and associated test conditions see the Electrical Characteristics tables Note 2 Unless otherwise specified all limits guaranteed for Vin Vonom 1 V Ij 100 LA and C 1 uF for 5V versions and 2 2uF for 3V and 3 3V versions Limits appearing in boldface type apply over the entire junction temperature range for operation Limits appearing in normal type apply for Ta Ty 25 C Additional conditions for the 8 pin versions are FEEDBACK tied to Vrap OUTPUT tied to SENSE and Vsuurpoww lt 0 8V Note 3 Guaranteed and 100 production tested Note 4 Guaranteed but not 100 production tested These
4. TEMPERATURE C LP2951 Feedback Bias Current BIAS CURRENT nA 1 6 75 50 25 0 25 5 0 75 100125 150 TEMPERATURE C LP2951 Error Comparator Output Vour 5V 2 5 2 0 50k RESISTOR TO EXTERNAL 5V SUPPLY 1 5 HYSTERESIS 1 0 SINK CURRENT mA 0 5 9 AY 15 6 7 8 INPUT VOLTAGE V Advanced Monolithic Systems Inc 0 0 0 75 50 25 0 25 5 TEMPERATURE C LP2951 Comparator Sink Current 0 0 0 1 0 2 0 3 0 4 0 5 0 6 0 7 0 8 0 9 OUTPUT LOW VOLTAGE V 0 75 100125 150 Dropout Voltage 500 Z 400 m 300 d gt p 200 2 T 25 C Q 100 A 1004A lmA 10mA 100mA OUTPUT CURRENT LP2951 Feedback Pin Current 30 F EIN7DRVEN BY EXTERNAL SOURCE REGULATOR RUN g 0 OPEN LOOP z H 50 Ei Ce T 125 C D 100 M z 150 T 25 C H 200 es T 55 C 250 2 0 1 5 1 0 05 0 05 1 0 FEEDBACK VOLTAGE V Line Transient Response 100 H mV Z an R H mV SS IZ R 0 5m EU an 5 mV m 8V KE Ea Za 6v gt 4V 0 200 400 600 800 TIME us 6680B Sierra Lane Dublin CA 94568 Phone 925 556 9090 Fax 925 556 9140 LP2950 LP29
5. When used in dual supply systems where the output terminal sees loads returned to a negative supply the output voltage should be diode clamped to ground Note 11 Vinuaows 2 2V Vin 30V Vou 0 Feedback pin tied to SVrap Note 12 Output or reference voltage temperature coefficients defined as the worst case voltage change divided by the total temperature range Advanced Monolithic Systems Inc 6680B Sierra Lane Dublin CA 94568 Phone 925 556 9090 Fax 925 556 9140 LP2950 LP2951 Note 13 Thermal regulation is defined as the change in output voltage at a time T after a change in power dissipation is applied excluding load or line regulation effects Specifications are for a 50mA load pulse at Vm 30V 1 25W pulse for T 210 ms Note 14 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 15 Line regulation for the LP2951 is tested at 150 C for I 1 mA For I 100 uA and T 125 C line regulation is guaranteed by design to 0 2 See typical performance characteristics for line regulation versus temperature and load current Note 16 All LP2950 devices have the nominal output voltage coded as the last two digits of the part number In the LP2951 products the 3 0V and 3 3V versions are designated by the last two digits but the 5V version is denoted with no code of th
6. 5V runs the error amplifier at lower gains so that more output capacitance is needed For the worst case situation of a 100mA load at 1 23V output Output shorted to Feedback a 3 3uF or greater capacitor should be used Unlike many other regulators the LP2950 will remain stable and in regulation with no load in addition to the internal voltage divider This is especially important in CMOS RAM keep alive applications When setting the output voltage of the LP2951 version with external resistors a minimum load of luA is recommended A IuF tantalum or aluminum electrolytic capacitor should be placed from the LP2950 LP2951 input to the ground 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 Stray capacitance to the LP2951 Feedback terminal can cause instability This may especially be a problem when using a higher value of external resistors to set the output voltage Adding a 100 pF capacitor between Output and Feedback and increasing the output capacitor to at least 3 3 uF will fix this problem Error Detection Comparator Output The comparator produces a logic low output whenever the LP2951 output falls out of regulation by more than approximately 5 This figure is the comparator s built in offset of about 60 mV divided by the 1 235 reference voltage Refer to the block diagram in the front of the datasheet This trip level remains 5 below normal regard
7. limits are not used to calculate outgoing AQL levels 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 Comparator thresholds are expressed in terms of a voltage differential at the feedback terminal below the nominal reference voltage measured at Vin Vonom 1 V 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 Vou as Vou is varied with the dropout warning occurring at typically 5 below nominal 7 5 guaranteed Note 7 Vi lt Vout Vin 1V 2 3 SV S30V 100LAXT 100 mA T Tmax Note 8 The junction to ambient thermal resistance are as follows 180 C W and 160 C W for the TO 92 N package with 0 40 inch and 0 25 inch leads to the printed circuit board PCB respectively 105 C W for the molded plastic DIP P and 160 C W for the molded plastic SO 8 S The above thermal resistances for the N S and P packages apply when the package is soldered directly to the PCB Note 9 May exceed input supply voltage Note 10
8. output voltage temperature coefficient making these devices useful as a low power voltage reference The LP2950 is offered in the 3 pin TO 92 package LP2951 is available in 8 pin plastic SOIC and DIP packages and offers three major additional system features An error flag output warns of a low output voltage often due to failing batteries on input The LP2951 also features the logic compatible shutdown input which enables the regulator to be switched on and off The LP2951 device may be pin strapped for a 5V 3 3V or 3V output or programmed from 1 24V to 29V with an external pair of resistors ORDERING INFORMATION PIN CONNECTION PACKAGE TYPE OPERATING PEA ALEN TO 92 8 LEAD PDIP 8 LEAD SOIC TEMP RANGE outeur T LP2950ACN X LP2951ACP X LP2951ACS X IND SENSE LP2950CN X LP2951CP X LP2951CS X IND SHUTDOWN GROUND X 3 3V or 3V Top View TO 92 OUTPUT INPUT GND Bottom View Advanced Monolithic Systems Inc 6680B Sierra Lane Dublin CA 94568 Phone 925 556 9090 Fax 925 556 9140 LP2950 LP2951 ABSOLUTE MAXIMUM RATINGS Note 1 Input Supply Voltage 0 3 to 30V Wave 4 seconds 260 C SHUTDOWN Input Voltage Infrared 4 seconds 240 C Error Comparator Output Vapor Phase 4 seconds 219 C Voltage Note 9 ESD TBD FEEDBACK Input Voltage 1 5 to 30V Note 9 Note 10 OPERATING RATINGS Note 1 Power Dissipation Internally Limited Junction Temperature 150 C Max Input Supply Voltage 30V Storage Temp
9. 51 TYPICAL PERFORMANCE CHARACTERISTICS Continued 250 ew e eos CHANGE mV un oo OUTPUT VOLTAGE e m 2 LOAD CURRENT 2 10 OUPUT IMPEDANCE 80 70 60 50 40 30 RIPPLE REJECTION dB 20 10 Load Transient Response 0 1 2 3 4 5 TIME ms Output Impedance Le 100UA 10 100 1K 10K 100K 1M FREQUENCY Hz Ripple Rejection 10 10 10 10 105 106 Advanced Monolithic Systems Inc FREQUENCY Hz OUTPUT VOLTAGE LOAD CURRENT VOLTAGE NOISE SPECTRAL RIPPLE REJECTION dB CHANGE mV DENSITY mVAHz Load Transient Response 0 4 8 12 16 20 TIME ms Ripple Rejection 90 80 70 60 y 50 40 30 20 10 10 10 10 10 106 FREQUENCY Hz LP2951 Output Noise 3 5 5V OUTPUT 1 100mA 3 0 2 5 Cz QUE 2 0 L5 C 220 uF C 23 3 uF 1 0 0 01 UF 0 5 BYPASS PIN 1 TO 0 0 PIN 7 10
10. LP2950ACN 3 Advanced LP2950 LP2951 e e Monolithic 100mA LOW DROPOUT VOLTAGE REGULATOR Systems FEATURES APPLICATIONS e 5V 3 3V and 3V Versions at 100mA Output Current e Battery Powered Systems e High Accuracy Output Voltage Portable Consumer Equipment Extremely Low Quiescent Current Cordless Telephones Low Dropout Voltage Portable Notebook Computers Extremely Tight Load and Line Regulation Portable Instrumentation Very Low Temperature Coefficient e Radio Control Systems Current and Thermal Limiting Automotive Electronics e Needs Minimum Capacitance 1uF for Stability Avionics Unregulated DC Positive Transients 60V Low Power Voltage Reference ADDITIONAL FEATURES LP2951 ONLY e 1 24V to 29V Programmable Output Error Flag Warning of Voltage Output Dropout Logic Controlled Electronic Shutdown GENERAL DESCRIPTION The LP2950 and LP2951 are micropower voltage regulators ideally suited for use in battery powered systems These devices feature very low quiescent current typ 75uA and very low dropout voltage typ 45mV at light loads and 380mV at 100mA thus prolonging battery life The quiescent current increases only slightly in dropout The LP2950 LP2951 has positive transient protection up to 60V and can survive unregulated input transient up to 20V below ground The LP2950 and LP2951 were designed to include a tight initial tolerance typ 0 5 excellent load and line regulation typ 0 0596 and a very low
11. SV 196 SENSE 0 TO IA LP2951 P T 220uF 2kQ 19 4001A Advanced Monolithic Systems Inc Regulator with Early Warning and Auxiliary Output D 5V MEMORY SUPPLY EARLY WARNING V SENSE ss Var MAIN 5V OUTPUT TAP mp LP2951 2 SD ERROR e Early warning flag on low input voltage e Main output latches off at lower input voltages e Battery backup on auxiliary output Operation Reg 1 s Vour is programmed one diode drop above SV It s error flag becomes active when Vins 5 7V When Vin drops below 5 3V the error flag of Reg 2 becomes active and via Q1 latches the main output off When Vin again exceeds 5 7V Reg 1 is back in regulation and the early warning signal rises unlatching Reg 2 via D3 Latch Off When Error Flag Occurs ERROR LP2951 6680B Sierra Lane Dublin CA 94568 Phone 925 556 9090 Fax 925 556 9140 LP2950 LP2951 PACKAGE DIMENSIONS inches millimeters unless otherwise noted 3 LEAD TO 92 PLASTIC PACKAGE N 0 180 0 005 0 060 0 005 4 57240 127 1 52430 127 pei 0 060 0 010 N E 0 90 1 52420 254 2 286 a 0 180 0 005 NOM 4 57240 127 0 140 0 010 3 55640 127 An 10 le P ev MIN 0 050 UNCONTROLLED 1270 LEAD DIMENSIONS MAX v Li gt a CERREN N TO 92 AMS DRW 042391 R 0 01640 003 0 406 0 076
12. V LP2950 Maximum Rated Output Current Thermal Response 120 5 TO 92 PACKAGE H 25 LEADS SOLDERED 2 e lt 100 TO PC BOARD z a E 80 Tmax 1259 C 3 9 g c 60 50 SC E 2 40 E E x A 1 125W O 20 BE FM 0 Se i 0 5 10 15 20 25 30 A 10 20 30 40 50 INPUT VOLTAGE V Advanced Monolithic Systems Inc TIME us 6680B Sierra Lane Dublin CA 94568 Phone 925 556 9090 Fax 925 556 9140 30 LP2950 LP2951 APPLICATION HINTS External Capacitors A 1 0 uF or greater capacitor is required between output and ground for stability at output voltages of 5V or more At lower output voltages more capacitance is required 2 2 or more is recommended for 3V and 3 3V versions Without this capacitor the part will oscillate Most types of tantalum or aluminum electrolytic works fine here even film types work but are not recommended for reasons of cost Many aluminum types have electrolytes that freeze at about 30 C so solid tantalums are recommended for operation below 25 C The important parameters of the capacitor are an ESR of about 5 Q or less and resonant frequency above 500 kHz parameters in the value of the capacitor The value of this capacitor may be increased without limit At lower values of output current less output capacitance is required for stability The capacitor can be reduced to 0 33 uF for currents below 10 mA or 0 1 uF for currents below 1 mA Using the adjustable versions at voltages below
13. d Vrap pins together Alternatively it may be programmed for any output voltage between its 1 235V reference and its 30V maximum rating As seen in Figure 2 an external pair of resistors is required The complete equation for the output voltage is Vou Vrer X 1 Ri R2 IrBRi where VRer is the nominal 1 235 reference voltage and Ir is the feedback pin bias current nominally 20 nA The minimum recommended load current of 1 LA forces an upper limit of 1 2 MQ on value of Ro if the regulator must work with no load a condition often found in CMOS in standby Irg will produce a 2 typical error in Vour which may be eliminated at room temperature by trimming R For better accuracy choosing R2 100k reduces this error to 0 17 while increasing the resistor program current by 12 uA Since the LP2951 typically draws 60 HA at no load with Pin 2 open circuited this is a small price to pay Reducing Output Noise In reference applications it may be an advantageous to reduce the AC noise present at the output One method 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 LP2950 but is relatively inefficient as increasing the capacitor from 1 uF to 220 uF only decreases the noise from 430 HV to 160 LV rms for a 100 kHz bandwidth at 5V output Noise could also be reduced fourfold by a bypass capacitor across Ri since it reduces the high freque
14. e part number BLOCK DIAGRAM AND TYPICAL APPLICATIONS LP2950 XX LP2951 XX OUT UNREGULATED DC Ij 100mA OUTPUT In UNREGULATED DC Vour LS 100mA SEE APPLICATION FROM HINTS SEE APPLICATION CMOS AMPLIFIER mess ee TO CMOS OR TTL 1 23V REFERENCE REFERENCE GROUND ERROR DETECTION COMPARATOR Advanced Monolithic Systems Inc 6680B Sierra Lane Dublin CA 94568 Phone 925 556 9090 Fax 925 556 9140 LP2950 LP2951 TYPICAL PERFORMANCE CHARACTERISTICS Quiescent Current Dropout Characteristics Input Current 10 6 250 5V OUTPUT 225 5V OUTPUT 5 F 200 R 50kQ m 5 1 4 R 50 kQ E ie 2 E Z 150 a B 9 3 125 E R 500 O 100 Reo e Bis 2 B qs 5 a x S Z 50 Q 1 25 0 01 0 0 0 1 1 10 100 0 1 2 3 4 5 6 0 1 2 3 4 5 6 7 8 9 10 LOAD CURRENT mA INPUT VOLTAGE V INPUT VOLTAGE V Temperature Drift of 3 Input Cu
15. erature 65 C to 150 C Junction Temperature Range Soldering Dwell Time Temperature Tj Note 8 LP2950AC XX LP2950C XX LP2951AC XX LP2951C XX 40 C to 125 C ELECTRICAL CHARACTERISTICS at V Vout 1V Ta 25 C unless otherwise noted LP2950AC LP2950C Parameter Conditions LP2951AC LP2951C Note 2 in Max i 3 V Versions Note 16 Ty 25 C Note 3 25 C XT 85 C Full Operating Temperature Range Output Voltage 3 3 V Versions Note 16 3 0 3 015 2 970 3 0 3 0 3 030 2 955 3 0 3 0 3 036 2 940 Output Voltage Ty 25 C Note 3 25 C XT 85 C Full Operating Temperature Range Output Voltage 5 V Versions Note 16 Output Voltage Ty 25 C Note 3 5 0 5 025 4 95 5 0 5 050 4 925 Output Voltage 25 C XT 85 C Full Operating Temperature Range Output Voltage All Voltage Options Output Voltage Temperature Coefficient Note 12 Note 4 Line Regulation Note 14 6V lt Vi SOV Note 15 Load Regulation Note 14 100 HA zl lt 100 mA Dropout Voltage I 1004 A Note 5 Ij 100 mA Ground Current I 100 HA IL 100 mA C t Limit Thermal Regulation Note 13 Advanced Monolithic Systems Inc 6680B Sierra Lane Dublin CA 94568 Phone 925 556 9090 Fax 925 556 9140 LP2950 LP2951 ELECTRICAL CHARACTERISTICS Note 2 Continued LP2950AC LP2950C PARAMETER CONDITIONS LP2951 AC LP2951C Note 2 Min E Output Noise Cy IF 10Hz to 100KHz C 200 uF Cy
16. less of the programmed output voltage of the 2951 For example the error flag trip level is typically 4 75V for a 5V output or 11 4V for a 12V output The out of regulation condition may be due either to low input voltage current limiting or thermal limiting Figure gives a timing diagram depicting the ERROR signal and the regulator output voltage as the LP2951 input is ramped up and down For 5V versions the ERROR signal becomes valid low at about 1 3V input It goes high at about 5V input the input voltage at which Vout 4 75 Since the LP2951 s dropout voltage is load dependent see curve in typical performance characteristics the input voltage trip point about 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 pullup resistor This resistor may be returned to the output or some other supply voltage depending on system requirements In determining a value for this resistor note that the output is rated to sink 400uA this sink current adds to battery drain in a low battery condition Suggested values range from 100K to 1MQ The resistor is not required if this output is unused Programming the Output Voltage LP2951 The LP2951 may be pin strapped for the nominal fixed output voltage using its internal voltage divider by tying the output and sense pins together and also tying the feedback an
17. ncy gain from 4 to unity Pick Cpypass 1 21R x 200 Hz or about 0 01 uF When doing this the output capacitor must be increased to 3 3 uF to maintain stability These changes reduce the output noise from 430 uV to 100 uV rms for a 100 kHz 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 Advanced Monolithic Systems Inc 6680B Sierra Lane Dublin CA 94568 Phone 925 556 9090 Fax 925 556 9140 LP2950 LP2951 APPLICATION HINTS Continued 4 75V OUTPUT VOLTAGE FIGURE 1 ERROR Output Timing When Vm 1 3V the error flag pin becomes a high impedance and the error flag voltage rises to its pull up voltage Using Vou as the pull up voltage see Figure 2 rather than an external 5V source will keep the error flag voltage under 1 2V typ in this condition The user may wish to drive down the error flag voltage using equal value resistors 10 k suggested to ensure a low level logic signal during any fault condition while still allowing a valid high logic level during normal operation TYPICAL APPLICATIONS 300 mA Regulator with 0 75 Dropout P IN OUT UE oe 2 27kQ SE UNREGULATED INPUT LP2951 SV OUTPUT Kaf Vour ERROR ERROR V 12 30V OUPUT OUT LP2951 SHUTDOWN Veer L FIGURE 2 Adjustable Regulator See Application Hints Vou Vrer X 1 Ri R
18. ne Dublin CA 94568 Phone 925 556 9090 Fax 925 556 9140
19. o Drive with TTL high to shut down Ground or leave if shutdown feature is not used Note Pins 2 and 6 are left open Wide Input Voltage Range Current Limiter VN ERROR 5 OUPUT ERROR LP2951 SHUTDOWN 3 INPUT Minimum Input Output voltage ranges from 40mV to 400mV depending on load current Current limit is typically 160 mA Advanced Monolithic Systems Inc 6680B Sierra Lane Dublin CA 94568 Phone 925 556 9090 Fax 925 556 9140 LP2950 LP2951 TYPICAL APPLICATIONS Continued Low Drift Current Source 5Volt Current Limiter V 2 30V 5V BUS V LP2950 5 0 SHUTDOWN 3 INPUT 0 1uF Minimum Input Output voltage ranges from 40mV to 400mV depending on load current Current limit is typically 160 mA 5V Regulator with 2 5V Sleep Function Open Circuit Detector for 4 to 20mA Current Loop 5V 4 7kQ 4 20mA OUTPUT OUPUT SHUTDOWN 3 lt MIN VOLTAGE 4V Advanced Monolithic Systems Inc 6680B Sierra Lane Dublin CA 94568 Phone 925 556 9090 Fax 925 556 9140 LP2950 LP2951 TYPICAL APPLICATIONS Continued 2 Ampere Low Dropout Regulator CURRENT LIMIT SECTION Vin Vour 5V a MJE2955 Tw SLA ERROR ERROR LP2951 0 05 2N3906 4 7MQ VOUT 1 23V 1 R1 R2 For 5V Vout use internal resistors Wire pin 6 to 7 and pin 2 to VourBuss 1A Regulator with 1 2V Dropout UNREGULATED INPUT SUPERTEX VP12C OUTPUT
20. rrent Representative Units Quiescent Current 120 5 06 160 110 5V OUTPUT 5V OUTPUT _ 100 R 502 EH z 140 lt 2 3 g 90 S 120 E 80 5 02 a z 70 2 100 1 1mA H J E S 60 50 D 80 gt gt 120 EH 5 Z 60 f E 40 S 4 98 m Bos O E 30 5 A 40 A 20 4 96 gt 20 10 o 0 4 94 0 0 1 234 5 6 7 8 9 10 75 50 25 0 25 50 75 100 125 150 0 1 2 3 4 5 6 7 8 INPUT VOLTAGE V TEMPERATURE C INPUT VOLTAGE V Quiescent Current Quiescent Current Quiescent Current 8 E lt z 7 a E E Ex 6 Z Z Z H H H 2 5 M D D D 4 E E Z Z Z 3 H H H Q k nN nN N 2 S 5 E o o 3 7 0 75 50 25 0 25 50 75 100 125 150 75 50 25 0 25 50 75 100125 150 0 1 2 3 4 5 6 7 8 TEMPERATURE C TEMPERATURE C INPUT VOLTAGE V Advanced Monolithic Systems Inc 6680B Sierra Lane Dublin CA 94568 Phone 925 556 9090 Fax 925 556 9140 LP2950 LP2951 TYPICAL PERFORMANCE CHARACTERISTICS Continued 170 160 150 140 130 120 110 SHORT CIRCUIT CURRENT mA 100 75 50 25 0 25 5 2 2 2 1 1 7 MINIMUM OPERATING VOLTAGE V 9 8 e 4 Ex 5 6 R 5 3 x 4 S 3 m 2 1 0 Short Circuit Current 600 500 400 DROPOUT VOLTAGE mV 0 75 100 125 150 TEMPERATURE C LP2951 Minimum Operating Voltage 20 10 Dropout Voltage 1 1004A 75 50 25 0 25 50 75 100125 150
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Advanced Monolithic Systems LP2950/LP2951 handbook