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| 0.1A LOW DROPOUT VOLTAGE REGULATORS Features High accuracy output voltage Guaranteed 0.1A output Very low quiescent current Low dropout voltage Extermely tight load and line regulation Very low temperature coefficent Need only 1uF for stability Error flag warns of output dropout Logi-control electronic shutdown Output programmable from 1.24 to 29V LM2950 TO-92 Applications - Battery powered systems - Cordless telephones - Radio control systems - Portable/Palm top/Notebook computer - Portable consumer equipment - Portable Instrumentation - Avionics - Automotive Electronics - SMPS Post-Regulator - Voltage Reference 1. Vout 2. Gnd 3. Vin 1 ORDERING INFORMATION DEVICE LM2950L-XX Adjustable=AD ) PKG TO-92 (XX= Output Voltage=2.85, 3.0, 3.3, 5.0V PRODUCT DESCRIPTION The LM2950 is a low power voltage regulator. This device excellent choice for use in battery powered application such as cordless telephone, radio control systems, and portable computers. The LM2950 features very low quiescent current (75 Typ.) and very low drop output voltage (Typ. 40 at light load and 380 at 100). This includes a tight initial tolerance of 0.5% Typ., extremely good load and line regulation of 0.05% Typ., and very low output temperature coefficient, making the LM2950 useful as a low-power voltage reference. 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 enable the regulator to be switched on and off. The LM2950 is available in 8-pin plastic packages. The regulator output voltage may be pin-strapped for a -XX volt or programmed from 1.24 volt to 29 volts with external pair of resistors. The LM2950 is offered in 3-pin to-92 package compatible with other fixed regulator. BLOCK DIAGRAM AND TYPICAL APPLICATIONS UNREGULATED DC INPUT OUTPUT + - VOUT 100 MAX 1 60K GROUND - +1.23V REFERENCE ERROR AMPLIFIER + HTC 1 0.1A LOW DROPOUT VOLTAGE REGULATORS ABSOLUTE MAXIMUM RATINGS POWER DISSIPATION Lead Temperature (Soldering, 5 seconds) Storage Temperature Range Operating Junction Temperature Range Input Supply Voltage Feedback Input Voltage Shutdown Input Voltage Error Comparator Output INTERNALLY LIMITED 260 -65 to +150 -55 to +150 -0.3 to +30V -1.5 to +30V -0.3 to +30V -0.3 to +30V LM2950 ELECTRICAL CHARACTERISTICS(at Ta=25, VIN=15V, unles otherwise specified) PARAMETER Output Voltage Output Voltage Output Voltage Temperature Coefficient Line Regulation (Note 3) Load Regulation (Note 3) Dropout Voltage (Note 4) Ground Current Dropout Ground Current Current Limit Thermal Regulation CL =1 Output Noise, 10Hz to 100kHz CL =200 CL =3.3 (Bypass=0.01 pins 7 to 1 Error Comparator Output Leakage Current Output Low Voltage Upper Threshold Voltage Lower Threshold Voltage Hysteresis Shutdown Input Input Logic Voltage Shutdown Pin Input Current Low (Regulator ON) High (Regulator OFF) VS=2.4V VS=30V (Note 7) VOUT=5.0V 3.3VVOUT5.0V 2.0VVOUT3.3V 2 30 450 3 50 600 10 20 30 1.3 0.7 V VOH=30V VIN=4.5V, IOL=400 (Note 6) (Note 6) (Note 6) 40 0.01 150 60 75 15 95 1.0 250 CONDITIONS (Note 2) -25 TJ 85 Full Operating Temperature 100IL 100,TJTJMAX (Note 1) V0+1VVIN30V 100IL 100 IL =100 IL =100 IL =100 IL =100 VIN=V0-0.5V, IL =100 VOUT=0 MIN 0.985V0 0.980V0 0.976V0 TYP V0 V0 50 0.04 0.1 50 380 75 8 110 160 0.05 430 160 100 Vr MAX 1.015V0 1.020V0 1.024V0 150 0.4 0.3 80 450 120 12 170 200 0.2 ppm/ % % %/W V UNITS Regulator Output Current Shutdown 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, VIN=V0+1V, IL =100 and C L =1. Additional condition for the 8-pin versions are feedback tied to -XX V tap and output tied to output Sense (V OUT=XX V) and VSHOUTDOWN 0.8V Note 3 : Regulations 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. HTC 2 0.1A LOW DROPOUT VOLTAGE REGULATORS LM2950 Note 4 : Dropout voltage is defined as the input to output differential at which the output voltage drops 100 below its nominal value measured at 1V differential. At very low values of programmed output voltage, the minimum input supply voltage(2.3V over temperature) must be taken into account. Note 5 : V REFVOUT(VIN-1V), 2.3VV IN30V, 100I L100, T JTJMAX Note 6 : Comparator thresholds are expressed in terms of a voltage differential at the feedback terminal below the nominal reference voltage measured at V 0+1V input. To express these thresholds in terms of output voltage changed, multiply by the error amplifier gain=V OUT/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 95x5V/1.235V=384. Thresholds remain constant as a percent V OUT as VOUT is varied, with the dropout warning occurring at typically 5% below nominal, 7.5% guaranteed. Note 7 : V SHUTDOWN2V, V IN30V, V OUT=0, Feed-back pin tied to -XX V Tap. HTC 3 |
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