LM9074 NSC | Alldatasheet

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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 2.5V with 180 mA output current n Externally programmed reset delay interval n Keep-alive feature with 2 logic control inputs n 60V Load dump transient protection n Thermal shutdown n Short circuit protection and disable safety features n Reverse battery protection n Low OFF quiescent current, 60 µA maximum n Wide operating temperature range −40˚C to +125˚C Connection Diagrams and Ordering Information(Top View) 14-Pin SO Package DS101305-2 Order Number LM9074M See NS Package Number M14A PRELIMINARY January 2000 LM9074 System Voltage Regulator with Keep-Alive ON/OFF Control © 2000 National Semiconductor Corporation DS101305 www.national.com

Absolute Maximum Ratings(Note 1) Input Voltage ON/OFF, Keep-Alive Inputs (through 1 kΩ ) DC Input Voltage −26V to +26V Positive Input Transient (t <100 ms) 40V 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 7.5V to 16.5V Ambient Temperature −40˚C to +125˚C θj-pins, M14A Package 30˚C/W θja, M14A Package 137˚C/W

Electrical Characteristics

Symbol Parameter Conditions Min Max Units REGULATOR OUTPUT V OUT Output Voltage 20 mA ≤ IOUT ≤ 180 mA 4.85 5.15 V ΔVOUT Line Line Regulation I OUT = 20 mA, 9V≤ VIN ≤ 16.5V IOUT = 20 mA, 7.5V≤ VIN ≤ 16.5V mV mV ΔVOUT Load Load Regulation V IN = 14.4V, 20 mA≤ IOUT ≤ 180 mA 50 mV Iq Quiescent Current 4V ≤ VON/OFF ≤ VIN 20mA ≤ IOUT ≤ 180mA 25 mA Ioff OFF Quiescent Current V IN ≤ 16.5V, Regulator OFF 60˚C ≤ TJ ≤ 135˚C µA µA Vdo Dropout Voltage I OUT = 20 mA IOUT = 180 mA 2.0 2.5 V V Isc Short Circuit Current R L = 1Ω 0.4 1.0 A PSRR Ripple Rejection V IN = (14VDC ) + (1VRMS @ 120Hz) IOUT = 50 mA 60 dB VothOFF Safety VOUT Latch-OFF Threshold In Keep-Alive mode VON/OFF = 0V, VKA = 0V 4 4.5 V Vo Transient V OUT during Transients V IN Peak ≤ 40V, R L = 100Ω ,τ = 100 ms 5.5 V RESET OUTPUT Vth Threshold Voltage ΔVOUT Required to Generate a Reset Output 4.85V ≤ V OUT ≤ 5.15V −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 0.9 V OUT VOUT V tdelay Delay Time Cdelay = 0.1 µFd 7 45 ms Idelay Charging Current for Cdelay −7 25 µA Rpu Internal Pull-up Resistance 12 80 k Ω CONTROL LOGIC V KA low Low Input Threshold Voltage, Keep-Alive Input 3.5V ≤ VOUT ≤ 5.25V 0.3 V OUT 0.5 VOUT V VKA high High Input Threshold Voltage, Keep-Alive Input 3.5V ≤ VOUT ≤ 5.25V 0.6 V OUT 0.8 VOUT V VON/OFF low Low Input Voltage, ON/OFF Input Rseries = 1k Ω −2 2 V VON/OFF high High Input Voltage, ON/OFF Input Rseries= 1k Ω 4V IN V LM9074 www.national.com 2

Electrical Characteristics(Continued) Symbol Parameter Conditions Min Max Units CONTROL LOGIC I ON/OFF Input Current, ON/OFF Input V ON/OFF ≤ 4V 330 µA 4V < VON/OFF < 7V 670 µA VON/OFF ≥ 7V 10 mA Rpu KA Internal Pull-up Resistance, Keep-Alive Input 20 100 k Ω Rpd ON/OFF Internal Pull-down Resistance ON/OFF Input 50 210 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, input pins VIN and the ON/OFF input will withstand ten pulses of±12 kV from a 150 pF capacitor discharged through a 560Ω resistor with each pin bypassed with a 22 nF, 100V ca- pacitor. Reset Operation and Protection Features Typical Performance Characteristics(TA = 25˚C unless indicated otherwise) DS101305-5 Turn ON Characteristics DS101305-6 Turn OFF Characteristics DS101305-7 LM9074 www.national.com3

Typical Performance Characteristics(TA = 25˚C unless indicated otherwise) (Continued) ON/OFF, Keep-Alive and Safety Latch-Off Control Diagrams Note:If Keep-Alive is provided by a microprocessor powered by the output voltage of the LM9074, the logic “1” voltage level will track VOUT as the regulator turns OFF. Reset Delay Time vs Temperature DS101305-13 Simple ON/OFF control (Keep-Alive input must be high to turn OFF output) DS101305-18 Keep-Alive Mode; Turn ON with ON/OFF control, Keep output biased with Keep-Alive input, Turn OFF with Keep-Alive (Keep-Alive low keeps output ON, Keep-Alive going high turns output OFF) DS101305-19 Switch ON with ON/OFF input; Keep output biased with Keep-Alive; Hold ouput ON with ON/OFF; Turn OFF with ON/OFF input. (Temporary Keep-Alive Mode) DS101305-20 Safety Latch OFF of VOUT when in Keep-Alive Mode (ON/OFF going high required to turn Output back ON) DS101305-21 LM9074 www.national.com 4

Output Operating Condition L X 0V L Low quiescent current standby (OFF) condition ↑ X5 V ↑ after delay Output turns ON H X 5V H Normal ON condition ↓ H 0V L Output turns OFF ↓ L 5V H Output kept ON by Keep-Alive Input ↑ L 5V H Output remains ON (or turns ON) HX ΔVOUT ≥ −300 mV L Output pulled out of regulation, reset flag generated LL V OUT ≤ 4V L Output latches OFF Block Diagram

Application Information

The LM9074 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 LM9074 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). This regulator is suitable for applications where continuous connection to the battery is required ( Refer to the Typical Ap- plication Circuit). ON/OFF control of the regulator and sys- tem can be accomplished by switching the ON/OFF input to the battery or ignition supply V IN supply through a SPST switch. If this input becomes open circuited, an internal pull-down resistor ensures that the regulator turns OFF. When the regulator is switched OFF the current load on the DS101305-22 LM9074 www.national.com5

Application Information(Continued) MICROPROCESSOR SYSTEM REGULATOR WITH KEEP-ALIVE INTERVAL AT TURN-OFF The following circuit illustrates a system application utilizing both of the logic control inputs of the LM9074. Closing the ON/OFF switch powers ON the system. Once powered, the system controller sets the Keep-Alive line low. The NPN transistor is used only to signal the controller that the ON/ OFF switch has been opened and the system is to be turned OFF. Upon detecting this high level at the ON/OFF Sense in- put line, the controller can then perform a power down rou- tine. The system will remain fully powered until the controller commands total shut down by taking the Keep-Alive line high. The system then shuts OFF and reverts to a very low current drain standby condition until switched back on. DS101305-26 LM9074 www.national.com7

Application Information(Continued) DS101305-25 LM9074 www.national.com 8

Physical Dimensionsinches (millimeters) unless otherwise noted 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 14-Lead (0.150’ Wide) Molded SO Package Order Number LM9074M LM9074 System Voltage Regulator with Keep-Alive ON/OFF Control 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.