LP2951ACS-3-3

100mA, LOW DROPOUT VOLTAGE REGULATORS OCTOBER 6, 2008 LP2950/LP2951 REV. G •        •     •       •       •     •     •    µ   •   Lead Free, RoHS Compliant Packages:      •         •   •  •   •   •   •  • •  •  •   •       •    •       Now Available in Lead Free Packaging                                                                                                                                                           UNREGULATED DC 5V @ 00mA MAX + 7 FEEDBACK 8 INPUT  OUTPUT 2 SENSE + _ FROM CMOS OR TTL 80kΩ  ERROR AMPLIFIER  SHUTDOWN 0 mV 5V TAP 0kΩ + 0kΩ + 5 ______ ERROR + µF . . TO CMOS OR TTL _ + .2V ERROR DETECTION COMPARATOR  REFERENCE GROUND Rev G LP2950-5 Low Dropout Linear Regulators © 2008 Exar Corporation                                                                                          ≤ ≤     µ ≤ ≤   ≤     ≤ ≤     µ ≤ ≤   ≤                                                                                 ≤ ≤    µ ≤ ≤                           µ        µ                           µ       µ    µ                 µ  µ     µ             µ                                    Rev G LP2950-5 Low Dropout Linear Regulators © 2008 Exar Corporation 2 LP2950/51 PARAMETER CONDITIONS (Note 2) 8-Pin Versions only (Continued) LP2951AC Min. Typ. Max. Min. LP2951C Typ. Max. UNITS 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 Regulator Output Current in Shutdown Thermal Resistance θJA Low (Regulator ON) High (Regulator OFF) VS= 2.4V VS= 30V (Note 8) 8 Pin SOIC 2.0 20 0.1 50 0.1 ppm/°C nA/°C VOH = 30V VIN= 4.5V IOL= 400 μA (Note 7) (Note 7) (Note 7) 0.01 150 40 60 75 15 1.3 30 675 3 128. 4 131.9 1 250 40 95 0.01 150 60 75 15 1 250 μA mV mV 95 mV mV 0.7 50 800 10 2.0 1.3 30 675 3 0.7 50 800 10 V V μA μA μA °C/W 3 Pin TO-92 °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 = 25°C, VIN= 6V, I L= 100 μA and CL = 1μF. 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 μA 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 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 ≤VIN≤30V, 100μA≤IL≤100mA, 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 © 2008 Exar Corporation 3      6 5 OUTPUT VOLTAGE (VOLTS) INPUT CURRENT (µA) 250 225 GROUND PIN CURRENT (mA) 10 200 175 150 125 100 R L = 50k Ω 4 R L= 1 3 R L =50kΩ 8 2 1 0 0 1 2 3 4 5 6 INPUT VOLTAGE (VOLTS) RL = 75 50 25 8 0.1 0 0 1 2 3 4 5 67 8 9 10 0.01 0.1 1 10 100 INPUT VOLTAGE (VOLTS) LOAD CURRENT (mA) Dropout Characteristics Input Current Quiescent Current 320 280 GROUND CURRENT (µA) INPUT CURRENT (mA) 240 200 160 IL= 0 I L = 1mA 120 80 40 0 0 1 2 3 4 5 6 7 8 160 150 140 130 120 110 100 90 80 70 60 50 40 30 20 10 0 0 1 2 3 4 5 6 16 GROUND CURRENT (mA) R L =50 Ω VOUT = 5V 12 V IN = 6V I L = 100mA 8 4 INPUT VOLTAGE (VOLTS) 7 8 9 10 -75 -50 -25 0 25 50 75 100 125 150 INPUT VOLTAGE (VOLTS) TEMPERATURE (ºC) Ground Current 16 14 Input Current 190 Ground Current QUIESCENT CURRENT (µA) GROUND CURRENT (mA) 12 I L =100mA 170 V IN =6V I L =100uA 10 8 6 4 2 0 150 130 0 1 2 3 4 5 6 7 8 -75 -50 -25 0 25 50 75 100 125 150 INPUT VOLTAGE TEMPERATURE (ºC) Ground Current Quiescent Current Rev G LP2950-5 Low Dropout Linear Regulators © 2008 Exar Corporation 4      600 I L = 100mA SHORT CIRCUIT CURRENT (mA) 500 170 160 500 DROP-OUT VOLTAGE (mV) DROP-OUT VOLTAGE (mV) 400 150 140 400 300 ~ ~ 300 200 TJ = 25ºC 130 120 100 50 0 -75 -50 -25 0 25 50 75 100 125 150 TEMPERATURE (ºC) I L = 100 µA 100 0 100µA 1mA 10mA 100mA OUTPUT CURRENT 110 110 -75 -50 -25 0 25 50 75 100 125 150 TEMPERATURE (ºC) Drop-Out Voltage 8 V OUT = 5V Drop-Out Voltage 2.5 T A = 125ºC Short Circuit Current 100 mV 50 mV INPUT OUTPUT VOLTAGE VOLTAGE CHANGE 6 COMPARATOR OUTPUT (V) 2.0 SINK CURRENT (mA) 4 HYSTERESIS 0 -50 mV ~ ~ 8V 6V 4V 0 200 400 TIME(µs) C L = 1 µF I L = 1mA V OUT = 5V 1.5 T A = 25ºC 2 0 -2 0 1 PULLUP RESISTOR TO SEPARATE 5V SUPPLY 1.0 T A = -55ºC 0.5 0.0 2 3 4 5 INPUT VOLTAGE (V) 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 OUTPUT LOW VOLTAGE (V) 600 800 Error Comparator Output 10 IO = 100 µA OUTPUT IMPEDANCE (OHMS) LP2951 Comparator Sink Current 90 80 RIPPLE REJECTION (dB) Line Transient Response 90 80 RIPPLE REJECTION (dB) 5 2 1 0.5 0.2 0.1 0.05 0.02 0.01 10 100 1K 10K 100K 1M FREQUENCY (Hz) I O = 1mA I O = 100mA 70 IL= 0 70 60 50 40 30 I L = 1mA C L = 1µF V IN = 6V V OUT = 5V 60 50 40 C L = 1 µF V IN = 6V V OUT = 5V V OUT = 5V C L = 1 µF I L = 100 µA 30 20 10 1 20 I L = 10mA 10 2 10 3 10 4 10 5 10 6 10 1 10 2 10 3 10 4 10 5 10 6 FREQUENCY (Hz) FREQUENCY (Hz) Output Impedance Ripple Rejection Ripple Rejection Rev G LP2950-5 Low Dropout Linear Regulators © 2008 Exar Corporation 5      2.3 20 50 0 FEEDBACK CURRENT (µA) MINIMUM OPERATING VOLTAGE (V) 10 BIAS CURRENT (nA) PIN 7 DRIVEN BY EXTERNAL SOURCE (REGULATOR RUN OPEN LOOP) 2.1 -50 -100 -150 -200 -250 TA=1 25ºC 0 -10 1.9 T A = 25ºC -20 T A = 55ºC 1.7 -75 -50 -25 0 25 50 75 100 125 150 TEMPERATURE -30 -75 -50 -25 0 25 50 75 100 125 150 TEMPEATURE (ºC) -2.0 -1.5 -1.0 -0.5 0 0.5 1.0 FEEDBACK VOLTAGE (V) LP2951 Minimum Operating Voltage LP2951 Feedback Bias Current LP2951 Feedback Pin Current 250 80 60 40 LOAD OUTPUT VOLTAGE CURRENT CHANGE (mV) 7 6 SHUTDOWN OUTPUT PINOUT VOLTAGE (V) VOLTAGE (V) 200 150 LOAD OUTPUT VOLTAGE CURRENT CHANGE (mV) C L= 1 µF 5 100 20 0 -20 -40 -60 ~ ~ C L = 10 µF V OUT = 5V 4 3 2 1 0 2 0 C L= 10 µF I L = 10mA V IN = 8V V OUT = 5V 50 0 -50 -100 ~ ~ C L = 1 µF V OUT = 5V 100 µA mA 100 100 0 1 2 TIME (ms) µA µA 100 3 4 5 -2 0 4 8 12 16 20 -100 0 100 200 300 400 500 600 700 TIME (us) TIME (ms) Load Transient Response Load Transient Response Enable Transient 120 400 TO-92 PACKAGE 0.25" LEADS SOLDERED TO PC BOARD Vout=5V 120 8-PIN MOLDED PIN 2 TO PIN 4 RESISTANCE (kΩ) 100 OUTPUT CURRENT (mA) 100 OUTPUT CURRENT (mA) 300 80 60 80 DIP SOLDERED TO PC BOARD T JMAX = 125º C V OUT = 5V 60 40 20 0 0 T A = 85 ºC T JMAX = 125 ºC 200 T A = 25ºC T A =25 ºC 40 20 T A = 50ºC 100 T A = 85ºC 0 5 10 15 20 25 30 INPUT VOLTAGE (V) 0 -75 -50 -25 0 25 50 75 100 125 150 TEMPERATURE (ºC) 0 5 10 15 20 25 30 INPUT VOLTAGE (V) LP2950 Maxium Rated Output Rev G LP2951 Divider Resistance LP2950 Maxium Rated Output Current © 2008 Exar Corporation LP2950-5 Low Dropout Linear Regulators 6              µ        µ         µ                                   µ    µ                 µ                               µ     µ                                                      µ     µ                            Rev G LP2950-5 Low Dropout Linear Regulators © 2008 Exar Corporation 7             µ                            °                °     Ω                                                       µ   µ                              µ                                                                 µ                               µ                                                                       µ                                                                                                                                                µ                  Ω                                                                                             ×                        µ      Ω                                                     µ      µ                                                                        µ   µ      µ  µ                                      ≅   π ×    µ           µ           µ  µ                                                                             Rev G LP2950-5 Low Dropout Linear Regulators © 2008 Exar Corporation 8    +V IN 100K ERROR OUTPUT 5 ______ 8 +V IN V OUT 1 ERROR 1.24 to 2 9V LP2951 SHUTDOWN INPUT 3 SD GND 4 R1 FB 7 + .01µF 3.3µF 1.23V V REF R2     +V IN 470kΩ 5 ______ 8 +V IN 470kΩ ERROR +V IN V OUT 1 V OUT ERROR OUTPUT 5 ______ 8 +V IN V OUT 1 LP2951 3 ERROR *V OUT = V IN SD GND 4 R1 FB 7 + 1µF SHUTDOWN INPUT 3 LP2951 SD GND 4 RESET FB 7 R2 *MINIMUM INPUT-OUTPUT VOLTAGE RANGES FROM 40mV to 400mV. DEPENDING ON LOAD CURRENT. CURRENT LIMIT IS TYPICALLY 150mA         Rev G         LP2950-5 Low Dropout Linear Regulators © 2008 Exar Corporation 9     + 6V SEALED LEADACID BATTERY SOURCE 120kΩ FB 1.5kΩ 1N457 8 +V IN V OUT 1 MAIN V+ SPX385 LP2951 FOR 5.5 V 400kΩ 3 100kΩ SD GND 4 SENSE MEMORY V+ 2 + 1µF 20kΩ NI-CAD BACKUP BATTERY      Ω                         Ω       Ω   Ω         Ω    Ω      Ω   Ω      Ω                               Ω         Rev G LP2950-5 Low Dropout Linear Regulators © 2008 Exar Corporation 0     +V IN 8 AUX SHUTDOW INPUT ON OFF  +V IN SD 0K Ω. _______ 5 ERROR 5 DEGREE SHUTDOWN FLAG . LP295 V OUT GND +  FB 7  TEMP SENSOR AS5 - EXTERNAL CIRCUIT PROTECTED FROM OVER TEMPERATURE (V+ GOES OFF WHEN TEMP > 25) OR RELAY 8.2K Ω       +5V  20mA .7mA UNREGULATED INPUT 8 +V IN V OUT N00 OUTPUT 8 IN   0KΩ 27KΩ V OUT 2N52 (2) LP295 LP295 FB 7 2  2 0.µF V TAP SENSE 5V OUTPUT + FB GND  N57 7 GND  .7µF 0K Ω LOAD 50mA TO 00 mA MIN VOLTAGE = V            042408 Rev F       LP2950-5 Low Dropout Linear Regulator © 2008 Exar Corporation  PACKAGE: 3 PIN TO-92 Rev G LP2950-5 Low Dropout Linear Regulators © 2008 Exar Corporation 2 PACKAGE: 3 PIN TO-92 AMMO PACK Rev G LP2950-5 Low Dropout Linear Regulators © 2008 Exar Corporation 3 PACKAGE: 8 PIN NSOIC Rev G LP2950-5 Low Dropout Linear Regulators © 2008 Exar Corporation 4 ORDERING INFORMATION Part Number LP2950ACN-L-- LP2950ACN-L--/TR LP2950ACN-L-5-0 LP2950ACN-L-5-0/TR LP2950CN-L-- LP2950CN-L--/TR LP2950CN-L-5-0 LP2950CN-L-5-0/TR LP295ACS-L-- LP295ACS-L--/TR LP295ACS-L-5-0 LP295ACS-L-5-0/TR LP295CS-L-- LP295CS-L--/TR LP295CS-L-5-0 LP295CS-L-5-0/TR Accuracy 0.50% 0.50% 0.50% 0.50% % % % % 0.50% 0.50% 0.50% 0.50% % % % % Output Package Shipping Status Voltage .V .V 5.0V 5.0V .V .V 5.0V 5.0V .V .V 5.0V/ADJ 5.0V/ADJ .V .V 5.0V/ADJ 5.0V/ADJ Lead Free  Pin TO-92 Bulk Active Active Active Active Active Active Active Active Active Active Active Active Active Active Active Active Lead Free Tape & Reel  Pin TO-92 Lead Free  Pin TO-92 Bulk Lead Free Tape & Reel  Pin TO-92 Lead Free  Pin TO-92 Bulk Lead Free Tape & Reel  Pin TO-92 Lead Free  Pin TO-92 Bulk Lead Free Tape & Reel  Pin TO-92 Lead Free 8 Pin SOIC Bulk Lead Free Tape & Reel 8 Pin SOIC Lead Free 8 Pin SOIC Bulk Lead Free Tape & Reel 8 Pin SOIC Lead Free 8 Pin SOIC Bulk Lead Free Tape & Reel 8 Pin SOIC Lead Free 8 Pin SOIC Bulk Lead Free Tape & Reel 8 Pin SOIC Rev G LP2950-5 Low Dropout Linear Regulators © 2008 Exar Corporation 5 ORDERING INFORMATION (continued) Part Number LP2950ACN-- LP2950ACN-5-0 LP2950CN-- LP2950CN--/TR LP2950CN-5-0 LP2950CN-5-0/TR LP295ACS-- LP295ACS-5-0 LP295CS-- LP295CS--/TR LP295CS-5-0 LP295CS-5-0/TR LP2950ACN--/TR LP2950ACN-5-0/TR LP295ACS--/TR LP295ACS-5-0/TR Accuracy 0.50% 0.50% % % % % 0.50% 0.50% % % % % 0.50% 0.50% 0.50% 0.50% Output Package Shipping Status Voltage .V 5.0V .V .V 5.0V 5.0V .V .V .V  Pin TO-92  Pin TO-92  Pin TO-92  Pin TO-92 8 Pin SOIC 8 Pin SOIC Bulk Bulk Bulk Bulk Bulk Bulk Bulk Bulk EOL EOL EOL EOL EOL EOL EOL EOL EOL EOL EOL EOL OBS OBS OBS OBS  Pin TO-92 Tape & Reel  Pin TO-92 Tape & Reel 5.0V/ADJ 8 Pin SOIC 8 Pin SOIC Tape & Reel 5.0V/ADJ 8 Pin SOIC .V 5.0V .V 5.0V/ADJ 8 Pin SOIC Tape & Reel  Pin TO-92 Tape & Reel  Pin TO-92 Tape & Reel 8 Pin SOIC Tape & Reel 5.0V/ADJ 8 Pin SOIC Tape & Reel 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 © 2008 Exar Corporation 6