LM2951

100mA LOW DROPOUT VOLTAGE REGULATORS FEATURES ● High accuracy output voltage ● Guaranteed 100 mA output ● Very low quiescent current ● Extremely tight load and line regulation ● Very low temperature coefficient ● Current and thermal limiting ● Low dropout voltage ● Need only 1uF for stability ● Error flag warns of output dropout ● Logi-control electronic shutdown ● Output programmable from 1.24 to 29V ● Moisture Sensitivity Level 3 Pin 1 : Output Pin 2 : Ground Pin 3 : Input 1 2 3 LM2950/1 TO- 92 PKG SOP- 8 PKG Pin : 1. Output 2. Sense 3. Shutdown 4. Ground 5. Error 6. Tap 7. Feedback 8. Input Applications ● High-efficiency linear regulator, voltage reference ● Battery powered systems ● Portable consumer equipment ● Portable / Parm, Desktop / Notebook computers ● Portable Instrumentation, cordless telephones ● Automotive Electronics, Radio control systems ● SMPS Post-Regulator, Avionics ORDERING INFORMATION DEVICE PKG LM2950-XX LM2951D-XX Adjustable) TO-92 SOP-8 (XX= 1.5, 1.8, 2.8, 2.85, 3.0, 3.3, 5.0V, DESCRIPTION The LM2950/1 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 LM2950/1 features very low quiescent current (75㎂ Typ.) and very low drop output voltage (Typ. 400㎷ 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 LM2950/1 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 LM2950/1 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 LM2950/1 is offered in 3-pin to-92 package compatible with other fixed regulator. Feb 2009 - Rev. 1.2 HTC −1− 100mA LOW DROPOUT VOLTAGE REGULATORS BLOCK DIAGRAM AND TYPICAL APPLICATIONS (LM2950) UNREGULATED DC LM2950/1 + INPUT VOUT OUTPUT + 100㎃ MAX + 1.23V ERROR AMPLIFIER + 1㎌ REFERENCE 60KΩ GROUND BLOCK DIAGRAM AND TYPICAL APPLICATIONS (LM2951) 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 Feb 2009 - Rev. 1.2 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 HTC −2− 100mA LOW DROPOUT VOLTAGE REGULATORS 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) CONDITIONS (Note 2) -25℃ ≤TJ ≤85℃ Full Operating Temperature 100㎂≤IL≤100㎃,TJ≤TJMAX (Note 1) V0+1V≤VIN≤30V 100㎂≤IL≤100㎃ IL=100㎂ IL=100㎃ MIN 0.985｜V0｜ 0.980｜V0｜ 0.976｜V0｜ TYP V0 V0 50 0.04 0.1 50 380 MAX LM2950/1 UNITS 1.015｜V0｜ 1.020｜V0｜ 1.024｜V0｜ 150 0.4 0.3 80 450 ㎷ ppm/℃ % % V ELECTRICAL CHARACTERISTICS (at Ta=25℃, VIN=15V, unles otherwise specified) PARAMETER 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 Low (Regulator ON) High (Regulator OFF) Shutdown Pin Input Current VS=2.4V VS=30V (Note 7) Regulator Output Current Shutdown VOUT=5.0V 3.3V≤VOUT＜5.0V 2.0V≤VOUT＜3.3V 3 10 20 30 ㎂ 2 30 450 50 600 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 15 ㎷ 1.0 250 ㎂ CONDITIONS (Note 2) IL=100㎂ IL=100㎃ VIN=V0-0.5V, IL=100㎂ VOUT=0 MIN TYP 75 8 110 160 0.05 430 160 100 μVr㎳ MAX 120 12 170 250 0.2 UNITS ㎂ ㎃ ㎂ ㎃ %/W Feb 2009 - Rev. 1.2 HTC −3− 100mA LOW DROPOUT VOLTAGE REGULATORS LM2950/1 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 TJ = 25℃, VIN = V0+1V, IL = 100㎂ and CL = 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. 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 : VREF≤VOUT≤(VIN-1V), 2.3V≤VIN≤30V, 100㎂≤IL≤100㎃, TJ≤TJMAX Note 6 : Comparator thresholds are expressed in terms of a voltage differential at the feedback terminal below the nominal reference voltage measured at V +1V input. To express these thresholds in terms of output voltage changed, OUT 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㎷ x 5V / 1.235V = 384 ㎷. Thresholds remain constant as a percent VOUT as VOUT is varied, with the dropout warning occurring at typically 5% below nominal, 7.5% guaranteed. Note 7 : VSHUTDOWN≥2V, VIN≤30V, VOUT=0, Feed-back pin tied to -XX V Tap. Feb 2009 - Rev. 1.2 HTC −4−