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| LP2950/LP2951 150mA Low Drop Out Voltage Regulators PRODUCT DESCRIPTION The LP2950 and LP2951 are low power voltage regulators. These devices are an excellent choice for use in battery powered applications such as cordless telephone, radio control systems, and portable computers. The LP2950 and LP2951 feature very low quiescent current (75A Typ.) and very low drop output voltage (Typ. 40V at light load and 380mV at 100mA). This includes a tight initial tolerance of 0.5% typ., extremely good load and line regulation 0.05% typ. and very low output temperature coefficient, making the LP2950/LP2951 useful as a low power voltage reference. Other key additional feature of this unregulated input voltage transient of -20V below ground (reverse battery). The error flag output feature is used as power-on reset for warn of a low output voltage, due to following batteries on input. Other feature is the logic compatible shutdown input which enabled\s the regulator to be switched on and off. The LP2950 is offered in 3-pin TO-92 package compatible with other 5 volt regulators. The LP2951 is available in 8-pin plastic, SOP-8 package. The regulator output voltage may be pin-strapped for a 5 volt of programmed from 1.24 volt to 29 volts with external pair of resistors. Using of as design, processing and testing techniques make our LP2950 and LP2951 superior over similar products. FEATURES l Output accuracy 5V, 150mA output l Very low quiescent current l Low dropout voltage l Extremely tight load and line regulation l Very low temperature coefficient l Need only 1F for stability l Unregulated DC input can withstand -20V reverse battery and +60V positive transients l Direct replacement for LP2950/LP2951 sockets APPLICATIONS l Battery powered systems l Cordless telephones l Radio control systems l Portable/Palmtop/Notebook computers l Portable consumer equipment l Portable instrumentation l Avionics l Automotive electronics l SMPS Post-Regulator l Voltage reference LP2951 VERSIONS ONLY l Error flag warns of output dropout l Logic-Controlled electronic shutdown l Output programmable from 1.24 to 29V PIN ARRANGEMENT TO-92 PIN: 1. OUTPUT 2. SENSE 3. SHUTDOWN 4. GROUND 5. ERROR 6. 5V TAP 7. FEEDBACK 8. INPUT ORDERING INFORMATION TO-92 3-PIN LP2950CT LP2950ACT LP2950BCT PLASTIC SOP 8-PIN OPER. TEMP. IND. IND. IND. IND. IND. IND. PIN: 1. OUTPUT 2. GND 3. INPUT SOP-8 LP2951CS LP2951ACS LP2951BCS 3-1 LP2950/LP2951 150mA Low Drop Out Voltage Regulators ABSOLUTE MAXIMUM RATINGS Power Dissipation ....................... Internally Limited Lead Temp. (Soldering, 5 Seconds) ................ 260 o C Storage Temperature Range .............. -65 to +150 oC Operating Junction Temperature Range LP2951 ................................................ -55 to +150 oC LP2950BC/LP2950AC/LP2950C LP2951BC/LP2951AC/LP2951C ... -40 to +125 oC Input Supply Voltage .............................. -20 Feedback Input Voltage ........................ -1.5 Shutdown Input Voltage ....................... -0.3 Error Comparator Output ................... -0.3 ECD Rating is to be determined to to to to +60V +30V +30V +30V ELECTRICAL CHARACTERISTICS (Vin = 15V, TA = 25oC unless otherwise noted) PARAMETER CONDITIONS (Note 2) TJ = 25oC -25oC < TJ < 85oC Full Operating Temp. 100A < IL < 100mA TJ < TJMAX (Note 1) 6V < Vin < 30V (Note 4) 100A < IL < 100mA IL = 100A IL = 100mA IL = 150mA IL = 100A IL = 100mA IL = 150mA Vin = 4.5V IL = 100A Vout = 0 LP2950BC LP2951BC Min Typ Max 4.98 4.95 4.94 4.93 20 0.03 0.04 40 250 300 75 1.7 4 110 160 0.05 0.2 0.1 80 300 450 120 2.5 6 170 200 0.2 5.0 5.02 5.05 5.06 5.07 LP2950AC LP2951AC Min Typ Max 4.975 4.95 4.94 4.93 20 0.03 0.04 40 250 300 75 1.7 4 110 160 0.05 430 160 100 0.2 0.1 80 300 450 120 2.5 6 170 200 0.2 5.0 5.025 5.05 5.06 5.07 LP2950C UNITS LP2951C Min Typ Max 4.95 4.93 4.94 4.925 50 0.04 0.1 40 250 300 75 1.7 4 110 160 0.05 430 160 100 0.2 0.2 80 300 450 120 2.5 6 170 200 0.2 5.0 5.05 5.075 5.085 5.075 V Output Voltage Output Voltage Output Voltage Temperature Coefficient Line Regulation (Note 3) Load Regulation (Note 3) Dropout Voltage (Note 5) Ground Current V ppm/oC % % mV mV mV A mA mA A mA %W Vms Dropout Ground Current Current Limit Thermal Regulation Output Noise, 10Hz to 100kHz CL = 1F IL = 200F IL = 13.3F (Bypass = 0.01F pins 7 to 1 (LP2951)) 430 160 100 8-Pin Versions only Reference Voltage Reference Voltage Feedback Pin Bias Current Reference Voltage Temperature Coefficient Feedback Pin Bias Current Temperature Coefficient (Note 7) Over Temp. (Note 6) 1.22 1.19 LP2951BC 1.235 1.25 1.27 20 20 40 1.22 1.19 LP2951AC 1.235 1.25 1.27 20 20 40 1.216 1.18 LP2951C 1.235 1.254 1.28 20 50 40 V V nA ppm/oC 0.1 0.1 0.1 nA/oC 3-2 LP2950/LP2951 150mA Low Drop Out Voltage Regulators PARAMETER CONDITIONS (Note 2) LP2950BC LP2951BC Min Typ Max 0.01 150 40 60 75 15 95 1 250 LP2950AC LP2951AC Min Typ Max 0.01 150 40 60 75 15 95 1 250 LP2950C UNITS LP2951C Min Typ Max 1 150 40 60 75 15 95 250 A mV mV mV mV ERROR Comparator Output Leakage Current Output Low Voltage Upper Threshold Voltage Power Threshold Voltage Hysteresis Shutdown Input Output Logic Voltage Shutdown Pin Input Current Regulator Output Current in Shutdown Low (Regulator ON) High (Regulator OFF) VS = 2.4V VS = 30V Vout = 0 1.3 2 30 450 3 50 600 10 0.7 2 30 450 3 50 600 10 1.3 0.7 2 30 450 3 50 600 00 A A 1.3 0.7 V Voh = 30V Vin = 4.5V Iol = 400A (Note 8) (Note 8) (Note 8) 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=25 oC, V in =6V, I L=100A and CL=100F. Additional conditions for the 8-pin versions are feedback tied to 5V tap 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 LP2951 is tested at 150oC for IL=1mA. For IL=100A and TJ=150oC, 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 100mV below its nominal value measured at 1V differential at very low value 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), 2.3V < Vin < 30V, 100A < IL < 100mA, TJ < TJMAX. Note 7: Output or reference voltage temperature coefficient is defined as the worst case voltage change divided by the total temperature range. Note 8: Comparator thresholds are expressed in terms of a voltage differential at the feedbackterminal 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 occuring at typically 5% below nominal, 7.5% guaranteed. Note 9: Vshutdown>2V, Vin < 30V, Vout = 0, Feedback pin tied to 5V Tap. 3-3 |
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