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 (75µA Typ.) and very low drop output voltage (Typ. 40µV 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 APPLICATIONS l Output accuracy 5V, 150mA output l Battery powered systems l Very low quiescent current l Cordless telephones l Low dropout voltage l Radio control systems l Extremely tight load and line regulation l Portable/Palmtop/Notebook computers l Very low temperature coefficient l Portable consumer equipment l Need only 1µF for stability l Portable instrumentation l Unregulated DC input can withstand -20V reverse l Avionics l Automotive electronics battery and +60V positive transients l Direct replacement for LP2950/LP2951 sockets l SMPS Post-Regulator l Voltage reference LP2951 VERSIONS ONLY PIN ARRANGEMENT l Error flag warns of output dropout l Logic-Controlled electronic shutdown TO-92 l Output programmable from 1.24 to 29V ORDERING INFORMATION TO-92 3-PIN LP2950CT LP2950ACT LP2950BCT PLASTIC SOP 8-PIN LP2951CS LP2951ACS LP2951BCS OPER. TEMP. IND. IND. IND. IND. IND. IND. PIN: 1. OUTPUT 2. GND 3. INPUT 3-1 PIN: 1. OUTPUT 2. SENSE 3. SHUTDOWN 4. GROUND 5. ERROR 6. 5V TAP 7. FEEDBACK 8. INPUT SOP-8 LP2950/LP2951 150mA Low Drop Out Voltage Regulators ABSOLUTE MAXIMUM RATINGS 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 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 ELECTRICAL CHARACTERISTICS to to to to +60V +30V +30V +30V (Vin = 15V, TA = 25oC unless otherwise noted) PARAMETER CONDITIONS (Note 2) LP2950BC LP2951BC Min Typ Max Output Voltage TJ = 25oC -25oC < TJ < 85oC Full Operating Temp. 4.98 4.95 4.94 Output Voltage 100µA < IL < 100mA TJ < TJMAX 4.93 Output Voltage Temperature Coefficient (Note 1) Line Regulation (Note 3) 6V < Vin < 30V (Note 4) 0.03 0.2 0.03 0.2 0.04 0.2 % Load Regulation (Note 3) 100µA < IL < 100mA 0.04 0.1 0.04 0.1 0.1 0.2 % Dropout Voltage (Note 5) IL = 100µA IL = 100mA IL = 150mA 40 250 300 80 300 450 40 250 300 80 300 450 40 250 300 80 300 450 mV mV mV Ground Current IL = 100µA IL = 100mA IL = 150mA 75 1.7 4 120 2.5 6 75 1.7 4 120 2.5 6 75 1.7 4 120 2.5 6 µA mA mA Dropout Ground Current Vin = 4.5V IL = 100µA 110 170 110 170 110 170 µA Current Limit Vout = 0 160 200 160 200 160 200 mA 0.05 0.2 0.05 0.2 0.05 0.2 %W CL = 1µF IL = 200µF IL = 13.3µF (Bypass = 0.01µF pins 7 to 1 (LP2951)) 1.22 Over Temp. (Note 6) Feedback Pin Bias Current Feedback Pin Bias Current Temperature Coefficient 4.975 4.95 4.94 5.025 5.05 5.06 4.95 4.93 4.94 5.07 4.93 5.07 4.925 1.235 1.19 20 (Note 7) 5.0 20 1.22 1.27 1.19 40 1.235 20 5.05 5.075 5.085 V 5.075 V ppm/oC µVms 430 160 100 LP2951AC 1.25 5.0 50 430 160 100 LP2951BC Reference Voltage Reference Voltage Temperature Coefficient 5.02 5.05 5.06 430 160 100 8-Pin Versions only Reference Voltage LP2950C UNITS LP2951C Min Typ Max 20 Thermal Regulation Output Noise, 10Hz to 100kHz 5.0 LP2950AC LP2951AC Min Typ Max LP2951C 1.25 1.216 1.27 1.18 40 1.235 20 1.254 V 1.28 V 40 nA 20 20 50 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 LP2950AC LP2951AC Min Typ Max LP2950C UNITS LP2951C Min Typ Max ERROR Comparator Output Leakage Current Voh = 30V 0.01 1 0.01 1 Output Low Voltage Vin = 4.5V Iol = 400µA 150 250 150 250 Upper Threshold Voltage (Note 8) Power Threshold Voltage (Note 8) 75 Hysteresis (Note 8) 15 40 60 40 95 60 75 150 40 95 µA mV 60 75 15 1 250 mV 95 15 mV mV Shutdown Input Output Logic Voltage Low (Regulator ON) High (Regulator OFF) Shutdown Pin Input Current VS = 2.4V VS = 30V Regulator Output Current in Shutdown Vout = 0 1.3 0.7 2 1.3 0.7 2 1.3 0.7 V 2 30 450 50 600 30 450 50 600 30 450 50 600 µA 3 10 3 10 3 00 µA supply voltage of 2V (2.3V over temperature) must be taken into account. Note 6: Vref < Vout < (Vin-1V), 2.3V < Vin < 30V, 100µA < 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. 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=100µA and CL=100µF. 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=100µA 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 3-3