LP2950/LP2951 100mA Low Drop Out Voltage Regulators FEATURES APPLICATIONS • • • • • • • • • • • • • • • • • • • • High accuracy output voltage Guaranteed 100mA output Very low quiescent current Low dropout voltage Extremely tight load and line regulation Very low temperature coefficient Needs only 1µF for stability Error Flag warns of output dropout Logic-Controlled electronic shutdown Output programmable from 1.24 to 29V Battery powered systems Cordless telephones Radio control systems Portable/Palm top/Notebook computers Portable consumer equipment Portable Instrumentation Avionics Automotive Electronics SMPS Post-Regulator Voltage Reference PRODUCT DESCRIPTION The LP2950-XX/LP2951-XX is a low power voltage regulator. This device excellent choice for use in battery powered application such as c ordless telephone, radio control systems, and portable computers. The LP2950-XX/LP2951-XX features very low quiescent current (75µA Typ.) and very low drop output voltage (Typ. 40mV at light load and 380mV at 100mA). 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 LP2950-XX/LP2951-XX 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 i s the logic-compatible shutdown input which enable the regulator to be switched on and off. The LP2951-XX 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 LP2950-XX is offered in 3-pin TO-92 package compatible with other fixed regulator. 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°C Pin Connection LP2951-XX -65°C to+150°C -55°C to +150°C -0.3 to +30V -1.5 to +30V -0.3 to +30V -0.3 to +30V Device Selection Guide Device olts 2.85* LP2950-2.85, LP2951-2.85 3.0 LP2950-3.0, LP2951-3.0 3.3 LP2950-3.3, LP2951-3.3 5.0 LP2950-5.0, LP2951-5.0 * - other versions are also available Vout = 2.0V to 5.0V. Please consult factory for more information Top View TO-92 Plastic Package (LP2950-XX only) Vout, V Bottom View Figure 1. Adjustable Regulator LP2950/LP2951 100mA Low Drop Out Voltage Regulators ELECTRIC A LC H A R A C T E R ISTIC S(atT a=25oC ,VIN=15V;unlessotherw isenoted) Min Typ Max Units Output Voltage Parameter -25°C≤TJ≤85°C Full Operating Temperature 0.985 |V0| 0.98 |V0| V0 1.015 |V0| 1.02 |V0| V Output Voltage 100µA ≤ IL ≤ 100mA, TJ≤TJMAX (Note 1) 0.976|V0| Output Voltage Temperature Coefficient Line Regulation (Note 3) V0 + 1V ≤ Vin ≤ 30V (Note 4) Load Regulation (Note 3) Dropout Voltage (Note 5) Ground Current IL=100 µA IL=100 mA Dropout Ground Current Vin=V0 - 0.5V, IL=100 µA Vout=0 Current Limit Thermal Regulation Output Noise, 10Hz to 100KHz Conditions (Note 2) V0 1.024 |V0| 50 150 0.04 0.4 100µA ≤ IL ≤ 100mA 0.1 0.3 % IL=100 µA IL=100 mA 50 380 75 8 80 450 120 12 mV 110 170 160 0.05 200 0.2 µA mA %/W µA mA µV rms 430 160 100 CL=1µF CL=200µF CL=3.3µF (Bypass=0.01 µF pins 7 to 1 (LP2951-XX)) ppm/°C % 8-pin Versions only Reference Voltage Reference Voltage 1.21 Over Temperature (Note 6) 1.185 Feedback Pin Bias Current Reference Voltage Temperature Coefficient 1.235 Feedback Pin Bias Current Temperature Coefficient V 1.285 20 (Note 7) 1.26 40 n A 50 p p m /°C 0.1 n A /°C Error Comparator Output Leakage Current Voh=30V 0.01 1.0 Output Low Voltage Vin=4.5V, IOL=400 µA (Note 8) (Note 8) (Note 8) 150 250 60 75 15 95 1.3 0.7 30 450 50 600 Upper Threshold Voltage Lower Threshold Voltage Hysteresis Shutdown Input Input Logic Voltage Shut down Pin Input Current Regulator Output Current in Shutdown 40 Low (Regulator ON) High (Regulator OFF) VS=2.4V VS=30V (Note 9) µA mV V 2 VOUT = 5.0 V 3 10 µA 3.3V ≤ VOUT < 5.0 V 30 2.0V ≤ VOUT < 3.3 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 TJ = 25°C, Vin = V0 + 1V, IL = 100µA and CL = 1µF. Additional conditions for the 8-pin versions are feedback tied to -XX V tap and output tied to output Sense (Vout = XX V) and Vshutdown ≤ 0.8 V 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: Line regulation for LP2951-XX is tested at 150°C for IL = 1mA. For IL = 100µA and TJ = 125°C, 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 values 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, 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 feedback terminal below the nominal reference voltage measured at V0 + 1V 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/ 1.235V=384mV. Thresholds remain constant as a percent of Vout as Vout is varied , with the dropout warning occurring at typically 5% below nominal, 7.5% guaranteed. Note 9: Vshutdown ≥ 2V, Vin ≤ 30V, Vout = 0, Feed-back pin tied to -XX V Tap. 20 LP2950/LP2951 100mA Low Drop Out Voltage Regulators Block Diagram and Typical Applications LP2950-XX LP2951-XX PAD LOCATION LP2951-XX (For LP2950-XX fixed versions see Note 1) Chip Size: 2.05 x 1.15 mm Pad N 1 2 3 4 5 6 7 8 Pad Name Output Sense Shutdown Ground Error XX V tap Feedback Input X (µm) 440 810 1250 1865 1865 935 735 440 Note 1: For LP2950-XX: 8 - connected to Input 1,2 - connected to Output 4 - connected to GND Y (µm) 110 110 110 110 950 950 950 950