LM9071 NSC | Alldatasheet
Document overview
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Technical content
Features
n Automotive application reliability n 3% output voltage tolerance n Insensitive to radiated RFI n Dropout voltage less than 800 mV with 250 mA output current n Externally programmed reset delay interval n Thermal shutdown n Short circuit protection n Reverse battery protection n Wide operating temperature range −40˚C to +125˚C n TO-220 and TO-263 power surface mount power packages n Pin for pin compatible with the LM2927, L4947 and TLE4260 Typical Application and Connection Diagrams(Top View) DS012832-1 5-Lead TO-220 Package DS012832-2 Order Number LM9071T See NS Package Number T05A 5-Lead TO-220 Package DS012832-3 Order Number LM9071T/Flow LB03 See NS Package Number T05D 5-Lead TO-263 Surface Mount Package DS012832-4 Tab and Backside metal on all packages internally connected to ground. Order Number LM9071S See NS Package Number TS5B December 1999 LM9071 Low-Dropout System Voltage Regulator with Delayed Reset © 1999 National Semiconductor Corporation DS012832 www.national.com
Absolute Maximum Ratings(Note 1) DC Input Voltage −26V to +26V Positive Input Transient (t<100 ms) 60V Negative Input Transient (t<1 ms) −50V Reset Output Sink Current 5 mA Power Dissipation Internally Limited Junction Temperature 150˚C ESD Susceptibility (Note 2) 12 kV, 2 kV Lead Temperature (Soldering, 10 seconds) 260˚C Storage Temperature −50˚C to +150˚C Operating Ratings(Note 1) Input Voltage 6V to 26V Ambient Temperature −40˚C to +125˚C θjc, TO-220, TO-263 Packages 3˚C/W θja, TO-220, TO-263 Packages 43˚C/W
Electrical Characteristics
The following specifications apply for VCC = 6V to 26V, −40˚C≤ TA≤+125˚C, unless otherwise specified. COUT = 47 µFd with an ESR < 3Ω .C IN=1 µFd. Symbol Parameter Conditions Min Max Units REGULATOR OUTPUT V OUT Output Voltage 5 mA ≤ IOUT ≤ 250 mA 4.85 5.15 V ΔVOUT Line Line Regulation I OUT = 5 mA, 9V≤ VIN ≤ 16.5V 25 mV IOUT = 250 mA 50 mV ΔVOUT Load Load Regulation V IN = 14.4V, 5 mA≤ IOUT ≤ 250 mA 60 mV Iq Quiescent Current I OUT = 5m A 4 m A IOUT = 250 mA, VIN ≥ 8V 25 mA IOUT = 5 mA, VIN = 5V 10 mA IOUT = 250 mA, VIN = 6V 50 mA Vdo Dropout Voltage I OUT = 5 mA 300 mV IOUT = 250 mA 800 mV Isc Short Circuit Current R L = 1Ω 0.35 1.5 A RR Ripple Rejection F ripple= 120 Hz, Vripple= 1 Vrms IOUT = 50 mA 60 dB OVthr Overvoltage Shutdown Threshold 27 V VO Transient V OUT during Transients V IN Peak ≤ 60V, RL = 100Ω ,τ = 100 ms 7 V RESET OUTPUT Vth Threshold Voltage ΔV OUT Required to Generate a Reset Output 4.8V ≤ V OUT ≤ 5.2V −300 −500 mV Vlow Reset Output Low Voltage Isink = 1.6 mA, VOUT > 3.2V 0.4 V 1.4V ≤ VOUT ≤ 3.2V 0.8 V Vhigh Reset Output High Voltage 0.8 VOUT V tdelay Delay Time Cdelay = 100 mFd 7.6 35 ms Idelay Charging Current for Cdelay 10 30 µA Rpu Internal Pull-up Resistance 12 80 k Ω Note 1: Absolute Maximum Ratingsindicate limits beyond which damage to the device may occur.Operating Ratingsindicate conditions for which the device is intended to be functional, but do not guarantee specific performance limits. For guaranteed specifications and conditions, see theElectrical Characteristics. Note 2:All pins will survive an ESD impulse of±2000V using the human body model of 100 pF discharged through a 1.5 kΩ resistor. In addition the input voltage pin will withstand ten pulses of±12 kV from a 150 pF capacitor discharged through a 560Ω resistor when bypassed with a 22 nF, 100V capacitor. LM9071 www.national.com 2
Typical Performance Characteristics(TA = 25˚C unless indicated otherwise) Turn ON Characteristics DS012832-5 Turn OFF Characteristics DS012832-6 Normalized Output Voltage vs Temperature DS012832-7 Output Voltage at Input Voltage Extremes DS012832-8 Quiescent Current vs Input Voltage DS012832-9 Short Circuit Current vs Temperature DS012832-10 Dropout Voltage vs Temperature DS012832-11 Reset Delay Time vs Temperature DS012832-12 Output Capacitor ESR DS012832-13 LM9071 www.national.com3
Typical Performance Characteristics(TA = 25˚C unless indicated otherwise) (Continued) Reset Operation and Protection Features Block Diagram Maximum Power Dissipation (TO-220 Package) DS012832-14 Maximum Power Dissipation (TO-263 Package) DS012832-15 DS012832-16 DS012832-17 LM9071 www.national.com 4
The LM9071 voltage regulator has been optimized for use in microprocessor based automotive systems. Several unique design features have been incorporated to address many FMEA (Failure Mode Effects Analysis) concerns for fail-safe system performance. FAULT TOLERANT FEATURES While not specifically guaranteed due to production testing limitations, the LM9071 has been tested and shown to con- tinue to provide a regulated output and, not generate an er- roneous system reset signal while subjected to high levels of RF electric field energy (up to 300 V/m signal strength over a 2 MHz to 400 MHz frequency range). This is very important in vehicle safety related applications where the system must continue to operate normally. To maintain this immunity to RFI the output bypass capacitor is important (47 µF is rec- ommended). An output bypass capacitor of at least 10 µF is required for stability (47 µF is recommended). The ESR of this capacitor should be less than 3Ω . An input capacitor of 1 µF or larger is recommended to improve line transient and noise perfor- mance. Conventional load dump protection is built in to withstand up to +60V and −50V transients. Protection against reverse po- larity battery connections is also built in. With a reversed bat- tery connection the output of the LM9071 will not go more negative than one diode drop below ground. This will prevent damage to any of the 5V load circuits. RESET FLAG Excessive loading of the output to the point where the output voltage drops by 300 mV to 500 mV will signal a reset flag to the micro. This will warn of a V CC supply that may produce unpredictable operation of the system. On power-up and re- covery from a fault condition the delay capacitor is used to hold the micro in a reset condition for a programmable time interval to allow the system operating voltages and clock to stabilize before executing code. The delay time interval can be estimated by the following equation: INPUT STABILITY Low dropout voltage regulators which utilize a PNP power transistor usually exhibit a large increase in current when in dropout (V IN < 5.5V). This increase is caused by the satura- tion characteristics (β reduction) of the PNP transistor. To significantly minimize this increase in current the LM9071 detects when the PNP enters saturation and reduces the op- erating current. This reduction in input current can create a stability problem in applications with higher load current ( > 100 mA) where the input voltage is applied through a long length of wire, which in effect adds a significant amount of inductance in se- ries with the input. The drop in input current may create a positive input voltage transient which may take the PNP out of saturation. If the input voltage is held constant at the threshold where the PNP is going in and out of saturation, an oscillation may be created. This is only observed where a large series inductance is present in the input supply line and when the rise and fall time of the input supply is very slow. If the application and re- moval of the input voltage changes at a rate greater than 500 mV/µs it will move through the dropout region of the regulator (V IN of 3V to 5.5V) too quickly for an oscillation to be established. LM9071 www.national.com5
Physical Dimensionsinches (millimeters) unless otherwise noted 5-Lead Molded TO-220 Order Number LM9071T 5-Lead Molded TO-220 Order Number LM9071T/Flow LB03 LM9071 www.national.com 6
Physical Dimensionsinches (millimeters) unless otherwise noted (Continued) LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. 2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. National Semiconductor Corporation Americas Tel: 1-800-272-9959 Fax: 1-800-737-7018 Email: support@nsc.com National Semiconductor Europe Fax: +49 (0) 1 80-530 85 86 Email: europe.support@nsc.com Deutsch Tel: +49 (0) 1 80-530 85 85 English Tel: +49 (0) 1 80-532 78 32 Français Tel: +49 (0) 1 80-532 93 58 Italiano Tel: +49 (0) 1 80-534 16 80 National Semiconductor Asia Pacific Customer Response Group Tel: 65-2544466 Fax: 65-2504466 Email: sea.support@nsc.com National Semiconductor Japan Ltd. Tel: 81-3-5639-7560 Fax: 81-3-5639-7507 www.national.com 5-Lead Molded TO-263 Order Number LM9071S LM9071 Low-Dropout System Voltage Regulator with Delayed Reset National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.