LM9074EP LM9074EP Enhanced Plastic System Voltage Regulator with Keep-Alive ON/OFF Control Literature Number: SNVS271A August 30, 2011 LM9074EP Enhanced Plastic System Voltage Regulator with KeepAlive ON/OFF Control General Description Features The LM9074EP is a 5V, 3% accurate, 180 mA NPN voltage regulator. The regulator features an active low delayed reset output flag which can be used to reset a microprocessor system on turn-ON and in the event that the regulator output falls out of regulation for any reason. An external capacitor programs a delay time interval before the reset output can return high. Designed for automotive application the LM9074EP contains a variety of protection features such as reverse battery, overvoltage shutdown, thermal shutdown, input transient protection and a wide operating temperature range. A unique two-input logic control scheme is used to enable or disable the regulator output. An ON/OFF input can be provided by an ignition switch derived signal while a second, Keep-Alive input, is generated by a system controller. This allows for a system to remain ON after ignition has been switched OFF. The system controller can then execute a power-down routine and after which command the regulator OFF to a low quiescent current state (60 μA max). Design techniques have been employed to allow the regulator to remain operational and not generate false reset signals when subjected to high levels of RF energy (300V/m from 2 MHz to 400 MHz). ENHANCED PLASTIC ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ • • • • • • Automotive application reliability 3% output voltage tolerance Insensitive to radiated RFI Dropout voltage less than 2.5V with 180mA output current Externally programmed reset delay interval Keep-alive feature with 2 logic control inputs +40V Load dump transient protection Thermal shutdown Short circuit protection and disable safety features Reverse battery protection Low OFF quiescent current, 60μA maximum Applications ■ Selected Military Applications ■ Selected Avionics Applications Extended Temperature Performance of −40°C to +125°C Baseline Control - Single Fab & Assembly Site Process Change Notification (PCN) Qualification & Reliability Data Solder (PbSn) Lead Finish is standard Enhanced Diminishing Manufacturing Sources (DMS) Support Ordering Information Part Number VID Part Number NS Package Number (Note 3) LM9074MEP V62/04637-01 M14A (Note 1, Note 2) TBD TBD Note 1: For the following (Enhanced Plastic) version, check for availability: LM9074MXEP. Parts listed with an "X" are provided in Tape & Reel and parts without an "X" are in Rails. Note 2: FOR ADDITIONAL ORDERING AND PRODUCT INFORMATION, PLEASE VISIT THE ENHANCED PLASTIC WEB SITE AT: www.national.com/ mil Note 3: Refer to package details under Physical Dimensions © 2011 National Semiconductor Corporation 200908 200908 Version 2 Revision 2 www.national.com Print Date/Time: 2011/08/30 23:07:31 LM9074EP Enhanced Plastic System Voltage Regulator with Keep-Alive ON/OFF Control OBSOLETE LM9074EP Enhanced Plastic Connection Diagram (Top View) 14-Pin SO Package 20090802 See NS Package Number M14A www.national.com 2 200908 Version 2 Revision 2 Print Date/Time: 2011/08/30 23:07:31 If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Input Voltage ON/OFF, Keep-Alive Inputs (through 1 kΩ) DC Input Voltage 150°C 12 kV, 2 kV 260°C −50°C to +150°C Operating Ratings Input Voltage Ambient Temperature −26V to +26V Positive Input Transient (t<100 ms) Negative Input Transient (t<1 ms) Reset Output Sink Current Power Dissipation (Note 4) 40V −50V 5 mA Internally Limited 7.5V to 16.5V −40°C to +125°C θja, M14A Package 88°C/W θjc, M14A Package 34°C/W Electrical Characteristics The following specifications apply for VCC= 7.5V to 16.5V, −40°C ≤ TA≤ 125°C, unless otherwise specified. COUT=0.1µF. Symbol Parameter Conditions Min Max Units 4.85 5.15 V REGULATOR OUTPUT VOUT Output Voltage 20 mA ≤ IOUT ≤ 180 mA ΔVOUT Line Line Regulation IOUT = 20 mA, 9V ≤ VIN ≤ 16.5V 25 50 mV mV ΔVOUT Load Load Regulation VIN = 14.4V, 20 mA ≤ IOUT ≤ 180 mA 50 mV Iq Quiescent Current 4V ≤ VON/OFF ≤ VIN 25 mA −40°C ≤ TJ ≤ 60°C 20 60 μA μA 2.0 2.5 V V 1.0 A IOUT = 20 mA, 7.5V ≤ VIN ≤ 16.5V 20mA ≤ IOUT ≤ 180mA Ioff OFF Quiescent Current VIN ≤ 16.5V, Regulator OFF 60°C ≤ TJ ≤ 135°C Vdo Dropout Voltage IOUT = 20 mA IOUT = 180 mA Isc Short Circuit Current RL = 1Ω PSRR Ripple Rejection VIN = (14VDC) + (1VRMS @ 120Hz) VothOFF Safety VOUT Latch-OFF Threshold Vo Transient VOUT during Transients 0.4 IOUT = 50 mA 60 In Keep-Alive mode VON/OFF = 0V, VKA = 0V 4 dB 4.5 V 5.5 V −500 mV Isink = 1.6 mA, VOUT > 3.2V 0.4 V 1.4V ≤ VOUT ≤ 3.2V 0.8 V 0.9 VOUT VOUT V VIN Peak ≤ 40V, RL = 100Ω, τ = 100 ms RESET OUTPUT Vth ΔVOUT Required to Generate a Reset Threshold Voltage −300 Output 4.85V ≤ VOUT ≤ 5.15V Vlow Reset Output Low Voltage Vhigh Reset Output High Voltage tdelay Delay Time 7 45 ms Idelay Charging Current for Cdelay −7 25 μA Rpu Internal Pull-up Resistance 12 80 kΩ 0.3 VOUT 0.5 VOUT V Cdelay = 0.1 μFd CONTROL LOGIC VKAlow Low Input Threshold Voltage, Keep-Alive Input 3.5V ≤ VOUT ≤ 5.25V 3 200908 Version 2 Revision 2 Print Date/Time: 2011/08/30 23:07:31 www.national.com LM9074EP Enhanced Plastic Junction Temperature ESD Susceptibility (Note 5) Lead Temperature (Soldering, 10 seconds) Storage Temperature Absolute Maximum Ratings (Note 4) LM9074EP Enhanced Plastic Symbol Parameter Conditions Min Max Units 0.6 VOUT 0.8 VOUT V VKAhigh High Input Threshold Voltage, Keep-Alive Input 3.5V ≤ VOUT ≤ 5.25V VON/OFF low Low Input Voltage, ON/OFF Input Rseries = 1 kΩ −2 2 V VON/OFF high High Input Voltage, ON/OFF Input Rseries = 1 kΩ 4 VIN V ION/OFF Input Current, ON/OFF Input VON/OFF ≤ 4V 330 μA 4V < VON/OFF < 7V 670 μA VON/OFF ≥ 7V 10 mA RpuKA Internal Pull-up Resistance, KeepAlive Input 20 100 kΩ RpdON/OFF Internal Pull-down Resistance ON/ OFF Input 50 210 kΩ Note 4: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is intended to be functional, but do not guarantee specific performance limits. For guaranteed specifications and conditions, see the Electrical Characteristics. Note 5: 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 capacitor. Reset Operation and Protection Features 20090805 www.national.com 4 200908 Version 2 Revision 2 Print Date/Time: 2011/08/30 23:07:31 LM9074EP Enhanced Plastic Typical Performance Characteristics (TA = 25°C unless indicated otherwise) Turn ON Characteristics Turn OFF Characteristics 20090806 20090807 Reset Delay Time vs Temperature 20090813 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) 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 LM9074EP, the logic “1” voltage level will track VOUT as the regulator turns OFF. Simple ON/OFF control (Keep-Alive input must be high to turn OFF output) 20090819 20090818 5 200908 Version 2 Revision 2 Print Date/Time: 2011/08/30 23:07:31 www.national.com LM9074EP Enhanced Plastic 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) Safety Latch OFF of VOUT when in Keep-Alive Mode (ON/OFF going high required to turn Output back ON) 20090821 20090820 Control Logic Truth Table ON/OFF Input Keep-Alive Input Output Voltage Reset Output L X 0V L Operating Condition Low quiescent current standby (OFF) condition ↑ X 5V ↑ after delay H X 5V H Normal ON condition ↓ H 0V L Output turns OFF ↓ L 5V H Output kept ON by Keep-Alive Input Output turns ON ↑ L 5V H Output remains ON (or turns ON) H X ΔVOUT ≥ −300 mV L Output pulled out of regulation, reset flag generated L L VOUT ≤ 4V L Output latches OFF www.national.com 6 200908 Version 2 Revision 2 Print Date/Time: 2011/08/30 23:07:31 LM9074EP Enhanced Plastic Block Diagram 20090822 cations for VIN and the ON/OFF input pins to be connected in a system through long lengths of wire, the ESD protection of these pins has been increased to 12 kV with the addition of small input bypass capacitors. Application Information The LM9074EP 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 LM9074EP has been tested and shown to continue to provide a regulated output and, not generate an erroneous 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 recommended). This regulator is suitable for applications where continuous connection to the battery is required (Refer to the Typical Application Circuit ). ON/OFF control of the regulator and system can be accomplished by switching the ON/OFF input to the battery or ignition supply VIN supply through a SPST switch. If this input becomes open circuited, an internal pulldown resistor ensures that the regulator turns OFF. When the regulator is switched OFF the current load on the battery drops to less than 60 μA. With the possibility in many appli- 20090823 FIGURE 1. Typical Application Circuit An output bypass capacitor of at least 0.1µF is required for stability (47 µF is recommended). An input capacitor of 1 μF or larger is recommended to improve line transient and noise performance. With the Keep-Alive input, a system microprocessor has the ability to keep the regulator ON (with a logic “0” on Keep-Alive) 7 200908 Version 2 Revision 2 Print Date/Time: 2011/08/30 23:07:31 www.national.com LM9074EP Enhanced Plastic after the ON/OFF input has been commanded OFF. A powerdown sequence, when system variables are typically stored in programmable memory, can be executed and take as much time as necessary. At the end of the operation the micro then pulls Keep-Alive high and the regulator and system turn OFF and revert to the low quiescent current standby mode. For additional system reliability, consideration has been made for the possibility of a short circuited load at the output of the regulator. When the regulator is switched ON, conventional current limiting and thermal shutdown protect the regulator. When the regulator is switched OFF however, a grounded VCC supply to the micro (due to the shorted regulator output) will force the Keep-Alive input to be low and thus try to maintain the Keep-Alive mode of operation. With a shorted load, the drain on the battery could be as high as 1.5A. A separate internal circuit monitors the output voltage of the regulator. If VOUT is less than 4V, as would be the case with a shorted load, the Keep-Alive function is logically disabled to ensure that the regulator turns OFF and reverts to less than a 60 μA load on the battery. Conventional load dump protection is built in to withstand up to +60V and −50V transients. A 1 kΩ resistor in series with the ON/OFF and Keep-Alive inputs are recommended to provide the same level of transient protection for these pins if required. Protection against reverse polarity battery connections is also built in. With a reversed battery the output of the LM9074EP will not go more negative than one diode drop below ground. This will prevent damage to any of the 5V load circuits. For applications where the control logic is not required the logic pins should be configured as shown in Figure 2. A separate device, called the LM9071, can be used. The LM9071 is available in a 5-lead TO-220 package and does not provide control logic functions, but still retains all of the protection features of the LM9074EP. 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 VCC supply that may produce unpredictable operation of the system. On power-up and recovery 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 typical delay time interval can be estimated using the following equation: 20090824 FIGURE 2. Control Logic Not Used 20090826 www.national.com 8 200908 Version 2 Revision 2 Print Date/Time: 2011/08/30 23:07:31 20090825 9 200908 Version 2 Revision 2 Print Date/Time: 2011/08/30 23:07:31 www.national.com LM9074EP Enhanced Plastic switch has been opened and the system is to be turned OFF. Upon detecting this high level at the ON/OFF Sense input line, the controller can then perform a power down routine. 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. MICROPROCESSOR SYSTEM REGULATOR WITH KEEPALIVE INTERVAL AT TURN-OFF The following circuit illustrates a system application utilizing both of the logic control inputs of the LM9074EP. 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 LM9074EP Enhanced Plastic Physical Dimensions inches (millimeters) unless otherwise noted 14-Lead (0.150" Wide) Molded SO Package NS Package Number M14A www.national.com 10 200908 Version 2 Revision 2 Print Date/Time: 2011/08/30 23:07:31 LM9074EP Enhanced Plastic Notes 11 200908 Version 2 Revision 2 Print Date/Time: 2011/08/30 23:07:31 www.national.com LM9074EP Enhanced Plastic System Voltage Regulator with Keep-Alive ON/OFF Control Notes For more National Semiconductor product information and proven design tools, visit the following Web sites at: www.national.com Products Design Support Amplifiers www.national.com/amplifiers WEBENCH® Tools www.national.com/webench Audio www.national.com/audio App Notes www.national.com/appnotes Clock and Timing www.national.com/timing Reference Designs www.national.com/refdesigns Data Converters www.national.com/adc Samples www.national.com/samples Interface www.national.com/interface Eval Boards www.national.com/evalboards LVDS www.national.com/lvds Packaging www.national.com/packaging Power Management www.national.com/power Green Compliance www.national.com/quality/green Switching Regulators www.national.com/switchers Distributors www.national.com/contacts LDOs www.national.com/ldo Quality and Reliability www.national.com/quality LED Lighting www.national.com/led Feedback/Support www.national.com/feedback Voltage References www.national.com/vref Design Made Easy www.national.com/easy www.national.com/powerwise Applications & Markets www.national.com/solutions Mil/Aero www.national.com/milaero PowerWise® Solutions Serial Digital Interface (SDI) www.national.com/sdi Temperature Sensors www.national.com/tempsensors SolarMagic™ www.national.com/solarmagic PLL/VCO www.national.com/wireless www.national.com/training PowerWise® Design University THE CONTENTS OF THIS DOCUMENT ARE PROVIDED IN CONNECTION WITH NATIONAL SEMICONDUCTOR CORPORATION (“NATIONAL”) PRODUCTS. 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