0.1A LOW DROPOUT VOLTAGE REGULATORS LM2950 Features - TO-92 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 Applications 1. Vout 2. Gnd 3. Vin - 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 ORDERING INFORMATION DEVICE PKG LM2950L-XX TO-92 (XX= Output Voltage=2.85, 3.0, 3.3, 5.0V Adjustable=AD ) 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 VOUT OUTPUT + - - +1.23V ERROR AMPLIFIER REFERENCE 100㎃ MAX + 1㎌ 60KΩ GROUND HTC 1 0.1A LOW DROPOUT VOLTAGE REGULATORS LM2950 ABSOLUTE MAXIMUM RATINGS INTERNALLY LIMITED POWER DISSIPATION 260℃ Lead Temperature (Soldering, 5 seconds) Storage Temperature Range -65℃ to +150℃ Operating Junction Temperature Range -55℃ to +150℃ Input Supply Voltage -0.3 to +30V Feedback Input Voltage -1.5 to +30V Shutdown Input Voltage -0.3 to +30V Error Comparator Output -0.3 to +30V ELECTRICAL CHARACTERISTICS(at Ta=25℃, VIN=15V, unles otherwise specified) PARAMETER Output Voltage Output Voltage CONDITIONS (Note 2) MIN -25℃ ≤TJ ≤85℃ 0.985｜V0｜ Full Operating Temperature 100㎂≤IL ≤100㎃,TJ≤TJMAX 0.980｜V0｜ 0.976｜V0｜ TYP V0 V0 MAX UNITS 1.015｜V0｜ 1.020｜V0｜ V 1.024｜V0｜ (Note 1) V0+1V≤VIN≤30V 50 150 ppm/℃ Line Regulation (Note 3) 0.04 0.4 % Load Regulation (Note 3) 100㎂≤IL ≤100㎃ 0.1 0.3 % IL =100㎂ 50 80 IL =100㎃ 380 450 IL =100㎂ 75 120 ㎂ IL =100㎃ 8 12 ㎃ ㎂ Output Voltage Temperature Coefficient Dropout Voltage (Note 4) Ground Current ㎷ Dropout Ground Current VIN=V0-0.5V, IL =100㎂ 110 170 Current Limit VOUT=0 160 200 ㎃ 0.05 0.2 %/W Thermal Regulation CL =1㎌ Output Noise, 10Hz to 100kHz 430 CL =200㎌ 160 CL =3.3㎌ 100 μVr㎳ (Bypass=0.01㎌ pins 7 to 1 Error Comparator Output Leakage Current VOH=30V 0.01 1.0 Output Low Voltage VIN=4.5V, IOL=400㎂ 150 250 Upper Threshold Voltage (Note 6) Lower Threshold Voltage (Note 6) 75 Hysteresis (Note 6) 15 40 60 95 ㎂ ㎷ Shutdown Input Input Logic Voltage Shutdown Pin Input Current Regulator Output Current Shutdown 1.3 Low (Regulator ON) High (Regulator OFF) VS=2.4V VS=30V (Note 7) VOUT=5.0V 0.7 2 30 50 450 600 3 10 3.3V≤VOUT＜5.0V 20 2.0V≤VOUT＜3.3V 30 V ㎂ 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 REF≤VOUT≤(VIN-1V), 2.3V≤V IN≤30V, 100㎂≤I L≤100㎃, T J≤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 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 95㎷x5V/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 SHUTDOWN≥2V, V IN≤30V, V OUT=0, Feed-back pin tied to -XX V Tap. HTC 3