Is Now A Part Of Visit www.maxlinear.com for more information about MaxLinear Inc. LP2950/LP2951 100mA, LOW DROPOUT VOLTAGE REGULATORS OCTOBER 6, 2008 REV. G * * * * * * * * Lead Free, RoHS Compliant Packages: * * * * * * * * * * * * * * Now Available in Lead Free Packaging UNREGULATED DC 8 INPUT OUTPUT 7 + FEEDBACK 5V @ 00mA MAX 2 SENSE + _ FROM CMOS OR TTL 80k ERROR AMPLIFIER 0k 5V TAP SHUTDOWN + 0k 0 mV + _ + .2V 5 ______ + ERROR DETECTION COMPARATOR ERROR F . . TO CMOS OR TTL REFERENCE Rev G LP2950-51 Low Dropout Linear Regulator GROUND (c) 2008 Exar Corporation Rev G LP2950-5 Low Dropout Linear Regulators (c) 2008 Exar Corporation LP2950/51 PARAMETER CONDITIONS (Note 2) LP2951AC Min. Typ. Max. 8-Pin Versions only (Continued) Reference Voltage Temperature Coefficient Feedback Pin Bias Current Temperature Coefficient Error Comparator Min. LP2951C Typ. Max. UNITS 20 50 ppm/C 0.1 0.1 nA/C Output Leakage Current Output Low Voltage VOH = 30V 0.01 1 0.01 1 A VIN= 4.5V IOL= 400 A 150 250 150 250 mV Upper Threshold Voltage Lower Threshold Voltage Hysteresis (Note 7) 40 60 (Note 7) 75 (Note 7) 15 40 95 60 75 mV 95 15 mV mV Shutdown Input Input logic Voltage Shut down Pin Input Current Regulator Output Current in Shutdown Thermal Resistance JA Low (Regulator ON) High (Regulator OFF) VS= 2.4V VS= 30V (Note 8) 8 Pin SOIC 3 Pin TO-92 2.0 1.3 0.7 30 675 3 50 800 10 2.0 1.3 0.7 30 675 3 50 800 10 V V A A A 128. 4 C/W 131.9 C/W 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 = 25C, VIN= 6V, I L= 100 A and CL = 1F. Additional conditions for the 8-pin versions are feedback tied to 5V tap and output tied to output sense (VOUT= 5V) and V SHUTDOWN 0.8V. Note 3: Regulation is measured at constant junction temperature, using pulse testing with a low duty cycle. Changes i n output voltage due to heating effects are covered under the specification for thermal regulation. Note 4: Line regulation for the LP2951 is tested at IL= 1mA. For I L= 100 A and TJ = 125C, 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 100 mV 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: V REF V OUT (V IN- 1V), 2.3 VIN30V, 100AIL100mA, T J T JMAX. Note 7: Comparator thresholds are expressed in terms of a voltage differential at the feedback terminal below the nomi nal reference voltage measured at 6V input. To express these thresholds in terms of output voltage change, multiply by the error amplifier gain = V OUT/VREF= (R 1+ R 2)/R2. For example, at a programmed output voltage of 5V, the error output is guaranteed to go low when the output drops by 95 mV x 5V/1.235 = 384 mV. Thresholds remain constant as a percent of V OUTas V OUT is varied, with the dropout warning occurring at typically 5% below nominal, 7.5% guaranteed. Note 8: VSHUTDOWN 2V, V IN 30V, V OUT=0, Feedback pin tied to 5V Tap. Note 9: All typical values are not guaranteed. The value could vary from lot to lot. Rev G LP2950-5 Low Dropout Linear Regulators 3 (c) 2008 Exar Corporation 10 250 6 225 R L= 3 R L =50k 2 R L = 50k 175 GROUND PIN CURRENT (mA) 4 150 125 100 RL = 8 INPUT CURRENT (A) 200 8 OUTPUT VOLTAGE (VOLTS) 5 75 50 1 1 0.1 25 0 0 2 3 4 5 1 0 6 2 320 240 INPUT CURRENT (mA) GROUND CURRENT (A) 280 I L = 1mA 200 160 IL= 0 120 80 40 1 2 3 5 6 7 8 4 5 0.01 0.1 9 10 6 7 8 100 16 R L =50 VOUT = 5V 12 V IN = 6V I L = 100mA 8 4 0 1 2 3 4 5 6 7 8 -75 -50 -25 9 10 0 25 50 75 100 125 150 TEMPERATURE (C) INPUT VOLTAGE (VOLTS) Ground Current 10 Quiescent Current 160 150 140 130 120 110 100 90 80 70 60 50 40 30 20 10 0 INPUT VOLTAGE (VOLTS) 1 LOAD CURRENT (mA) Input Current Dropout Characteristics 0 4 INPUT VOLTAGE (VOLTS) INPUT VOLTAGE (VOLTS) 0 3 GROUND CURRENT (mA) 1 0 Ground Current Input Current 190 16 12 10 QUIESCENT CURRENT (A) GROUND CURRENT (mA) 14 I L =100mA 8 6 4 170 V IN =6V I L =100uA 150 130 2 0 0 1 2 3 4 5 6 7 -75 -50 -25 8 Ground Current Rev G 0 25 50 75 100 125 150 TEMPERATURE (C) INPUT VOLTAGE Quiescent Current LP2950-5 Low Dropout Linear Regulators 4 (c) 2008 Exar Corporation 170 500 600 I L = 100mA 160 400 300 ~ ~ 100 50 I L = 100 A SHORT CIRCUIT CURRENT (mA) 400 DROP-OUT VOLTAGE (mV) 300 200 TJ = 25C 100 0 0 -75 -50 -25 0 100A 25 50 75 100 125 150 1mA TEMPERATURE (C) 10mA 140 130 120 110 110 -75 -50 -25 100mA OUTPUT CURRENT 8 2.5 100 mV T A = 125C 50 mV SINK CURRENT (mA) 2.0 4 HYSTERESIS 2 0 1.5 T A = 25C 1.0 T A = -55C 0.5 0.0 0 1 2 3 4 5 0 8V 4V 0 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 INPUT VOLTAGE (V) C L = 1 F I L = 1mA V OUT = 5V -50 mV ~ ~ 6V PULLUP RESISTOR TO SEPARATE 5V SUPPLY -2 200 OUTPUT LOW VOLTAGE (V) 10 400 600 800 TIME(s) LP2951 Comparator Sink Current Error Comparator Output 25 50 75 100 125 150 Short Circuit Current V OUT = 5V 6 0 TEMPERATURE (C) Drop-Out Voltage Drop-Out Voltage COMPARATOR OUTPUT (V) 150 INPUT OUTPUT VOLTAGE VOLTAGE CHANGE DROP-OUT VOLTAGE (mV) 500 Line Transient Response 90 90 80 80 70 70 I O = 1mA I O = 100mA 1 0.5 V OUT = 5V C L = 1 F 0.2 0.1 0.05 50 40 I L = 100 A C L = 1 F V IN = 6V V OUT = 5V 10 100 1K 10K FREQUENCY (Hz) Output Impedance 100K 1M C L = 1F V IN = 6V V OUT = 5V I L = 1mA 60 50 40 30 20 0.01 Rev G IL= 0 60 30 0.02 RIPPLE REJECTION (dB) 5 2 RIPPLE REJECTION (dB) OUTPUT IMPEDANCE (OHMS) IO = 100 A I L = 10mA 20 10 1 10 2 10 3 10 4 10 5 10 6 FREQUENCY (Hz) 10 1 10 2 10 3 10 4 10 5 10 6 FREQUENCY (Hz) Ripple Rejection Ripple Rejection LP2950-5 Low Dropout Linear Regulators (c) 2008 Exar Corporation 1.9 FEEDBACK CURRENT (A) 2.1 0 -10 -20 40 100 20 -100 ~~ 100 mA 0 -60 ~ ~ 100 100 A A 0 1 2 3 4 5 4 8 12 16 120 100 OUTPUT CURRENT (mA) 100 T A = 85 C 15 20 INPUT VOLTAGE (V) LP2950 Maxium Rated Output 25 DIP SOLDERED TO PC BOARD T JMAX = 125 C V OUT = 5V 30 80 60 T A = 25C 40 T A = 50C 20 0 0 10 0 Enable Transient 200 T A =25 C 5 2 TIME (us) PIN 2 TO PIN 4 RESISTANCE (k) 40 I L = 10mA V IN = 8V V OUT = 5V C L= 10 F 0 300 Vout=5V 0 1 8-PIN MOLDED T JMAX = 125 C 20 2 -100 0 100 200 300 400 500 600 700 400 TO-92 PACKAGE 0.25" LEADS SOLDERED TO PC BOARD 60 3 20 Load Transient Response 120 80 5 4 TIME (ms) Load Transient Response 100 C L= 1 F -2 0 TIME (ms) OUTPUT CURRENT (mA) C L = 10 F V OUT = 5V A 100 Rev G SHUTDOWN OUTPUT PINOUT VOLTAGE (V) VOLTAGE (V) 6 150 LOAD OUTPUT VOLTAGE CURRENT CHANGE (mV) LOAD OUTPUT VOLTAGE CURRENT CHANGE (mV) 7 -40 1.0 LP2951 Feedback Pin Current 80 C L = 1 F V OUT = 5V 0.5 FEEDBACK VOLTAGE (V) 60 -20 0 -1.5 -1.0 -0.5 -2.0 250 -50 T A = 55C -200 200 0 T A = 25C -150 TEMPEATURE (C) LP2951 Feedback Bias Current 50 TA=1 25C -100 -75 -50 -25 0 25 50 75 100 125 150 TEMPERATURE LP2951 Minimum Operating Voltage -50 -250 -30 1.7 -75 -50 -25 0 25 50 75 100 125 150 PIN 7 DRIVEN BY EXTERNAL SOURCE (REGULATOR RUN OPEN LOOP) 0 10 BIAS CURRENT (nA) MINIMUM OPERATING VOLTAGE (V) 50 20 2.3 T A = 85C 0 -75 -50 -25 0 25 50 75 100 125 150 0 TEMPERATURE (C) LP2951 Divider Resistance 10 15 20 25 30 INPUT VOLTAGE (V) LP2950 Maxium Rated Output Current LP2950-5 Low Dropout Linear Regulators 6 5 (c) 2008 Exar Corporation Rev G LP2950-5 Low Dropout Linear Regulators 7 (c) 2008 Exar Corporation x x Rev G LP2950-5 Low Dropout Linear Regulators (c) 2008 Exar Corporation +V IN 100K 8 +V IN 5 ______ ERROR ERROR OUTPUT V OUT 1.24 to 2 9V 1 LP2951 SHUTDOWN 3 INPUT + R1 SD GND 4 3.3F .01F FB 7 1.23V R2 V REF +V IN 470k +V IN 8 5 ______ 470k ERROR +V IN V OUT V OUT 1 8 3 RESET SD 4 ERROR OUTPUT R1 GND 5 ______ ERROR LP2951 +V IN V OUT + LP2951 1F FB SHUTDOWN 7 INPUT 3 SD GND 4 R2 FB 7 *MINIMUM INPUT-OUTPUT VOLTAGE RANGES FROM 40mV to 400mV. DEPENDING ON LOAD CURRENT. CURRENT LIMIT IS TYPICALLY 150mA Rev G *V OUT = V IN 1 LP2950-5 Low Dropout Linear Regulators (c) 2008 Exar Corporation + 6V SEALED LEADACID BATTERY SOURCE 1.5k 120k 8 1N457 FB +V IN SPX385 V OUT 1 MAIN V+ LP2951 SENSE 400k FOR 5.5 V 3 MEMORY V+ 2 + 1F SD 100k GND 20k NI-CAD BACKUP BATTERY 4 Rev G LP2950-5 Low Dropout Linear Regulators 1 (c) 2008 Exar Corporation +V IN 8 AUX SHUTDOW INPUT 0K . +V IN _______ 5 ERROR SD OFF . LP295 ON V OUT GND FB + TEMP SENSOR 5 DEGREE SHUTDOWN FLAG EXTERNAL CIRCUIT PROTECTED FROM OVER TEMPERATURE (V+ GOES OFF WHEN TEMP > 25) 7 AS5 OR RELAY 8.2K - +5V UNREGULATED INPUT .7mA 20mA 8 OUTPUT 8 IN +V IN V OUT 0K 27K LP295 N00 LP295 0.F FB 7 5V 2 SENSE V TAP 2 GND 2N52 (2) V OUT FB GND 7 OUTPUT + 0K N57 .7F LOAD 50mA TO 00 mA MIN VOLTAGE = V 042408 Rev F LP2950-51 Low Dropout Linear Regulator 11 (c) 2008 Exar Corporation PaCKaGE: 3 PIN TO-92 Rev G LP2950-5 Low Dropout Linear Regulators 1 (c) 2008 Exar Corporation PaCKaGE: 3 PIN TO-92 AMMO PACK Rev G LP2950-5 Low Dropout Linear Regulators 1 (c) 2008 Exar Corporation PaCKaGE: 8 PIN NSOIC Rev G LP2950-5 Low Dropout Linear Regulators 13 (c) 2008 Exar Corporation ORDERING INFORMATION Part Number Accuracy Output Package Shipping Status Voltage LP2950ACN-L-3-3 0.50% 3.3V Lead Free 3 Pin TO-92 LP2950ACN-L-3-3/TR 0.50% 3.3V Lead Free Tape & Reel 3 Pin TO-92 Active LP2950ACN-L-5-0 0.50% 5.0V Lead Free 3 Pin TO-92 Active LP2950ACN-L-5-0/TR 0.50% 5.0V Lead Free Tape & Reel 3 Pin TO-92 Active LP2950CN-L-3-3 1% 3.3V Lead Free 3 Pin TO-92 Active LP2950CN-L-3-3/TR 1% 3.3V Lead Free Tape & Reel 3 Pin TO-92 Active LP2950CN-L-5-0 1% 5.0V Lead Free 3 Pin TO-92 Active LP2950CN-L-5-0/TR 1% 5.0V Lead Free Tape & Reel 3 Pin TO-92 Active LP2951ACS-L-3-3 0.50% 3.3V Lead Free 8 Pin SOIC Active LP2951ACS-L-3-3/TR 0.50% 3.3V Lead Free Tape & Reel 8 Pin SOIC Active LP2951ACS-L-5-0 0.50% 5.0V/ADJ Lead Free 8 Pin SOIC Active LP2951ACS-L-5-0/TR 0.50% 5.0V/ADJ Lead Free Tape & Reel 8 Pin SOIC Active LP2951CS-L-3-3 1% 3.3V Lead Free 8 Pin SOIC Active LP2951CS-L-3-3/TR 1% 3.3V Lead Free Tape & Reel 8 Pin SOIC Active LP2951CS-L-5-0 1% 5.0V/ADJ Lead Free 8 Pin SOIC Active LP2951CS-L-5-0/TR 1% 5.0V/ADJ Lead Free Tape & Reel 8 Pin SOIC Rev G LP2950-5 Low Dropout Linear Regulators 14 Bulk Active Bulk Bulk Bulk Bulk Bulk Bulk Bulk Active (c) 2008 Exar Corporation ORDERING INFORMATION (continued) Part Number Accuracy Output Package Shipping Status Voltage LP2950ACN-3-3 0.50% 3.3V 3 Pin TO-92 Bulk EOL LP2950ACN-5-0 0.50% 5.0V 3 Pin TO-92 Bulk EOL LP2950CN-3-3 1% 3.3V 3 Pin TO-92 Bulk EOL LP2950CN-3-3/TR 1% 3.3V 3 Pin TO-92 Tape & Reel EOL LP2950CN-5-0 1% 5.0V 3 Pin TO-92 EOL LP2950CN-5-0/TR 1% 5.0V 3 Pin TO-92 Tape & Reel EOL LP2951ACS-3-3 0.50% 3.3V 8 Pin SOIC Bulk EOL LP2951ACS-5-0 0.50% 5.0V/ADJ 8 Pin SOIC Bulk EOL Bulk EOL Bulk LP2951CS-3-3 1% 3.3V 8 Pin SOIC LP2951CS-3-3/TR 1% 3.3V 8 Pin SOIC Tape & Reel LP2951CS-5-0 1% 5.0V/ADJ 8 Pin SOIC LP2951CS-5-0/TR 1% 5.0V/ADJ 8 Pin SOIC Tape & Reel Bulk EOL EOL EOL LP2950ACN-3-3/TR 0.50% 3.3V 3 Pin TO-92 Tape & Reel OBS LP2950ACN-5-0/TR 0.50% 5.0V 3 Pin TO-92 Tape & Reel OBS LP2951ACS-3-3/TR 0.50% 3.3V 8 Pin SOIC Tape & Reel OBS LP2951ACS-5-0/TR 0.50% 5.0V/ADJ 8 Pin SOIC Tape & Reel OBS Exar Corporation Headquarters and Sales Office 48720 Kato Road Fremont, CA 94538 main: 510-668-7000 fax: 510-668-7030 EXAR Corporation reserves the right to make changes to the products contained in this publication in order to improve design, performance or reliability. EXAR Corporation assumes no responsibility for the use of any circuits described herein, conveys no license under any patent or other right, and makes no representation that the circuits are free of patent infringement. Charts and schedules contained here in are only for illustration purposes and may vary depending upon a user's specific application. While the information in this publication has been carefully checked; no responsibility, however, is assumed for inaccuracies. EXAR Corporation does not recommend the use of any of its products in life support applications where the failure or malfunction of the product can reasonably be expected to cause failure of the life support system or to significantly affect its safety or effectiveness. Products are not authorized for use in such applications unless EXAR Corporation receives, in writing, assurances to its satisfaction that: (a) the risk of injury or damage has been minimized; (b) the user assumes all such risks; (c) potential liability of EXAR Corporation is adequately protected under the circumstances. Rev G LP2950-5 Low Dropout Linear Regulators 1 (c) 2008 Exar Corporation The content of this document is furnished for informational use only, is subject to change without notice, and should not be construed as a commitment by MaxLinear, Inc.. MaxLinear, Inc. assumes no responsibility or liability for any errors or inaccuracies that may appear in the informational content contained in this guide. Complying with all applicable copyright laws is the responsibility of the user. Without limiting the rights under copyright, no part of this document may be reproduced into, stored in, or introduced into a retrieval system, or transmitted in any form or by any means (electronic, mechanical, photocopying, recording, or otherwise), or for any purpose, without the express written permission of MaxLinear, Inc. Maxlinear, Inc. does not recommend the use of any of its products in life support applications where the failure or malfunction of the product can reasonably be expected to cause failure of the life support system or to significantly affect its safety or effectiveness. Products are not authorized for use in such applications unless MaxLinear, Inc. receives, in writing, assurances to its satisfaction that: (a) the risk of injury or damage has been minimized; (b) the user assumes all such risks; (c) potential liability of MaxLinear, Inc. is adequately protected under the circumstances. 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