DATA SHEET LND2931 100mA Low Dropout Voltage Regulator GENERAL DESCRIPTION FEATURES This series of fixed-voltage and adjustable monolithic micropower voltage regulators is designed for a wide range of applications. This device is an excellent choice for use in batterypowered application. Furthermore, the quiescent current increases only slightly at dropout, which prolongs battery life. This series of fixed-voltage ( Typ. 60mV at light load and 300mV at 100mV) 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. This series of fixedvoltage and adjustable regulators is offered in 3pin TO-92 package (TO-220-5, SO-8 for LND2931) compatible with other fixed-voltage regulators. 1 GND 2 • • • • • • • • 3- terminal regulators ( To-220-5, SO-8 for LND2931) 100mA output within 2% over temperature Very low quiescent current Low dropout voltage (300mV Typ) Extremely tight load and line regulation Very low temperature coefficient Current and thermal limiting Unregulated DC input can withstand –20V reverse battery and +60V positive transients Direct replacement for National LM2931 fixed series, but has lower ground current, higher accuracy of output voltage and extremely tight load and line regulation. For adjust model LND2931 see typical applications on figure 2. APPLICATIONS PIN CONFIGURATION Output • 8 Input 7 GND LND2931 GND 3 6 GND Feedback 4 5 Shutdown • • • • • • • High-efficiency linear regulators Battery powered systems Portable/Palm top/ Notebook Computers Portable consumer equipment Portable instrumentation Automotive Electronics SMPS Post Regulator • Linear Dimensions, Inc. • 445 East Ohio Street, Chicago IL 60611 USA • tel 312.321.1810 • fax 312.321.1830 • www.lineardimensions.com • LND2931 ABSOLUTE MAXIMUM RATINGS Power Dissipation Lead Temperature(Soldering, 5 seconds) Storage Temperature Range Operating Junction Temperature Range Internally Limited 260ºC -65ºC to +150ºC -55ºC to +150ºC Input Supply Voltage -20V to +35V DEVICE SELECTION GUIDE Vout , VOLTS 3.3V* 5.0V 8.0V 8.5V 9.0V 10.0V 12.0V 15.0V 3.0v to 24V Device LND2931-3.3 LND2931-5.0 LND2931-8.0 LND2931-8.5 LND2931-9.0 LND2931-10 LND2931-12 LND2931-15 LND2931 * Other fixed versions are also available, VOUT =2.0V to 5.0V. Please consult for more information. OUTPUT OUTPUT GND INPUT TO-220 (Top View) GND INPUT TO-92 (Bottom View) • Linear Dimensions, Inc. • 445 East Ohio Street, Chicago IL 60611 USA • tel 312.321.1810 • fax 312.321.1830 • www.lineardimensions.com • LND2931 ELECTRICAL CHARACTERISTICS (TJ =25ºC, IO =100µA, VIN =14V (for 2931-15, VIN =16V), CO =100µF; unless otherwise noted) PARAMETER CONDITIONS TYP MAX Output Voltage (Fixed Model) -25º C≤TJ≤ 85ºC Full Operating Temperature 0.985 |VO| 0.98 |VO| VO 1.015|VO| 1.02 |VO| 100µA≤IL≤ 100mA, TJ≤Tjmax 0.975 |VO| VO 1.025 |VO| Output Voltage (Fixed Model) Input Supply Voltage Output Voltage Temperature Coefficient Line Regulation (Note 2) Load Regulation(Note 2) Dropout Voltage(Note 4) Ground Current (Note 5) Dropout Ground Current (Note 5) Current Limit Thermal Regulation(Note6) UNITS V 26 (Note 1) 50 150 ppm/ºC 13V ≤ Vin ≤ 26V (Note 3) 0.1 0.4 % 1mA≤ IL ≤ 100mA IL =10mA IL =100mA IL =100µA IL =10mA IL =100mA 0.1 60 300 100 0.9 8 0.3 200 600 150 1.5 12 % µA mA mA Vin=Vout -0.5V , IL =100µA 110 170 µA Vout=0 160 0.05 500 350 120 200 0.2 mA %/W Output Noise, 10Hz to 100KHz IL = 100mA CL=2.2µF CL=3.3µF CL=33µF Ripple Rejection Ratio IO =10mA,f=120Hz,Co=100µF, Vin=Vo+3V+2Vpp TO-220-5, SO-8 Versions Only Reference Voltage Reference Voltage Over Temperature (note 7) Feedback Pin Bias Current Reference Voltage (Note 1) Temperature Coefficient Feedback Pin Bias Current Temperature Coefficient Shutdown Input Low(Regulator ON) Input Logic Voltage High (Regulator OFF) VS = 2.4V Shutdown Pin Input Current VS = 26V (Note 8) Regulator Output Current in Shutdown MIN µV RMS 60 1.21 1.185 mV dB 1.235 20 1.26 1.285 40 V nA 50 ppm/ºC 0.1 nA/ºC 1.3 0.7 30 450 50 600 2 5.0V ≤Vout <15.0V 10 3.3V ≤Vout <5.0 V 20 2.0V ≤Vout <3.3V 30 V µA • Linear Dimensions, Inc. • 445 East Ohio Street, Chicago IL 60611 USA • tel 312.321.1810 • fax 312.321.1830 • www.lineardimensions.com • LND2931 Note 1: Output or reference voltage temperature coefficients defined as the worst case voltage change divided by the total temperature range. Note 2: Regulations are 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 3: Line regulation is tested at 150ºC for IL = 1mA, for IL=100µA and TJ =125ºC, line regulation is guaranteed by design to 0.2%. For LND2931-15 16V<= Vin <=26V. Note 4: Dropout voltage is defined as the input to output differential at which the output voltage drops 2% below its nominal value measured at 1V differential. Note 5: Ground pin current is the regulator quiescent current. The total current drawn from the source is the sum of the ground pin current and output load current. Note 6: Thermal regulation is the change in output voltage at a time T after a change in power dissipation, excluding load or line regulation effects. Specifications are for a 50mA load pulse (1.25W pulse) for T=10ms. Note7: Vref ≤ Vout ≤ (Vin-1V), 2.3V≤Vin ≤ 26V, 100µA ≤IL ≤ 100mA, TJ ≤ Tjmax. Note 8: Vshutdown ≥ 2V, VIN ≤ 26V, Vout =0V. BLOCK DIAGRAM AND TYPICAL APPLICATIONS Figure 1: Fixed Regulator Unregulated DC + INPUT OUTPUT + 5V IL <= 100mA 60k ERROR AMPLIFIER + See Application Hints 182k + 1.23 V Reference GROUND Figure 2:Adjustable Regulator Unregulated DC 7 + 8 FEEDBACK INPUT Vout 1.2A->24A IL <= 100mA 1 OUTPUT R1 + + R2 From CMOS or TTL 0.01µF 3.3 µF ERROR AMPLIFIER 5 SHUTDOWN 60k + 2,3,6,7 1.23 V Reference GROUND • Linear Dimensions, Inc. • 445 East Ohio Street, Chicago IL 60611 USA • tel 312.321.1810 • fax 312.321.1830 • www.lineardimensions.com • LND2931 TYPICAL APPLICATIONS 5V BUS +V IN 8 ERROR OUTPUT +V IN 5 1 V *V OUT +V IN IN V V OUT ERROR *V OUT + 1 µF LND2931 LND2931 SHUTDOWN 3 INPUT 5V OUT GND GND 4 FB 7 *Minimum input-output voltage ranges from 40mV to 400mV, depending on load current. Current limit is typically 160mA. *Minimum input-output voltage ranges from 40mV to 400mV, depending on load current. Current limit is typically 160mA. 5V Current Limiter Wide Input Voltage Range Current Limiter +V=1.2 IL LOAD 30V I = 1.23/R L +V IN 8 470k Ω 8 +V IN 5 470kΩ V LND2931 FB 7 3 SD RESET + 1 µF R1 GND 4 Latch Off When Error Flag Occurs LND2931 SHUTDOWN 3 SD INPUT GND 4 R2 *V OUT V OUT V OUT 1 V OUT ERROR 1 IN 1 µF FB 7 R 1% + 1 µF Low Drift Current Source • Linear Dimensions, Inc. • 445 East Ohio Street, Chicago IL 60611 USA • tel 312.321.1810 • fax 312.321.1830 • www.lineardimensions.com •