LND2951-3.3

• DATA SHEET LND2950 / LND2951 100mA Low Dropout Voltage Regulators GENERAL DESCRIPTION The LND2950-XX is a low power voltage regulator.This device is an excellent choice for use in battery powered application such as cordless telephone, radio control systems, and portable computers. The LND2950-XX/LND2951-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 LND2950-XX/LND2951-XX useful as a low-power voltage reference. The error flag output feature is used as power-on reset, warning of a low output voltage, due to falling battery voltage on input. Another feature is the logiccompatible shutdown input, which enables the regulator to be switched on and off. 8 dip The LND2951-XX is available in 8 pin plastic packages. The regulator output voltage may be pinstrapped for a –XX voltage or programmed from 1.24 volts to 29 volts with an external pair of resistors. The LND2950-XX is offered in a 3-pin TO-92 package compatible with other fixed regulators. FEATURES • • • • • • • • • • 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 APPLICATIONS • • • • • • • • • Battery powered systems Cordless telephones Radio control systems Portable/Palm Top/ notebook computers Portable Instrumentation Avionics Automotive Electronics SMPS Post-Regulator Voltage Reference DEVICE SELECTION GUIDE VOUT, Volts 2.85* 3.0 3.3 5.0 Device LND2950-2.85,LND2951-2.85 LND2950-3.0,LND2951-3.0 LND2950-3.3, LND2951-3.3 LND2950-5.0, LND2951-5.0 *Other versions are also available Vout=2.0V TO 5.0V. Please consult for more information • Linear Dimensions, Inc. • 445 East Ohio Street, Chicago IL 60611 USA • tel 312.321.1810 • fax 312.321.1830 • www.lineardimensions.com • LND2950 / LND2951 ABSOLUTE MAXIMUM RATING 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 260º -65ºC to+150ºC -55ºC to +150º -0.3 to+30V -1.5 to+30V -0.3 to +30V -0.3 to +30V PIN CONFIGURATION Output Sense Shutdown GND 1 2 3 4 8 7 6 5 Input Feedback -XX V tap Error OUTPUT GND INPUT LND2951-XX 8-Pin Plastic (Top View) +V IN TO-92 (Bottom View) 100kΩ ERROR OUTPUT 5 ERROR 8 VIN V OUT 1 V OUT 1.2 0.01µF R1 GND 4 FB 7 1.23V 30V + 3.3 µ F LND2951 SHUTDOWN 3 INPUT Off On Note : pins 2 and 6 are left open V OUT =V (1+ R1/R2) REF V REF R2 Figure 1: Adjustable Regulator • Linear Dimensions, Inc. • 445 East Ohio Street, Chicago IL 60611 USA • tel 312.321.1810 • fax 312.321.1830 • www.lineardimensions.com • LND2950 / LND2951 ELECTRICAL CHARACTERISTICS PARAMETER Output Voltage Output Voltage Output Voltage Temperature Coefficient Line Regulation(Note 3) Load Regulation( Note3) Dropout Voltage(Note 5) Ground Current Dropout Ground Current Current Limit Thermal regulation Output Noise,10Hz to 100KHz 8-PIN Versions Only Reference Voltage Reference Voltage Feedback Pin Bias Current Reference Voltage Temperature Coefficient Feedback Pin Bias Current Temperature Coefficient Error Comparator Output Leakage Current Output Low Voltage Upper Threshold Voltage Lower Threshold Voltage Hysteresis Shutdown Input Input Logic Voltage Shut down pin Input Current (TA=25 ºC, VIN=15V Unless otherwise noted) CONDITIONS (note 2) -25ºC ≤Tj ≤85ºC Full Operating Temperature 100µA ≤IL ≤100mA, TJ ≤ TJMAX (note 1) VO+1V≤VIN ≤30V(Note 4) 100µA ≤IL ≤100mA IL= 100µA IL= 100mA IL= 100µA IL= 100mA VIN =V0 =-0.5V,IL =100µA Vout=0 CL= 1µF CL=200µF CL= 3.3µF (Bypass=0.01µF pins 7 to 1 (LND2951-XX)) MIN 0.985 |Vo| 0.98 |Vo| 0.976 |Vo| TYP VO VO 50 0.04 0.1 50 380 75 8 110 160 0.05 430 160 100 MAX 1.015 |Vo| 1.02 |Vo| 1.024 |Vo| 150 0.4 0.3 80 450 120 12 170 200 0.2 UNITS V ppm/ºC % % mV µA mA µA mA %/W µV rms Over temperature(Note 6) (note 7) 1.21 1.185 1.235 20 50 0.1 1.26 1.285 40 V nA ppm/ºC nA/ºC Voh=30V Vin=4.5V,IOL=400µA (note 8) (note 8) (note 8) Low(Regulator ON) High (Regulator OFF) Vs= 2.4V Vs=30V (Note 9) Vout=5.0V 3.3V≤Vout