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LM9074EP Enhanced Plastic System Voltage Regulator with Keep-Alive ON/OFF Control Literature Number: SNVS271A
August 30, 2011 Enhanced Plastic System Voltage Regulator with Keep- Alive ON/OFF Control General Description 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 sys- tem on turn-ON and in the event that the regulator output falls out of regulation for any reason. An external capacitor pro- grams 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, over- voltage shutdown, thermal shutdown, input transient protec- tion 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 pro- vided 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
- 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
Features
■ 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
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 www.national.com
200908 Version 2 Revision 2 Print Date/Time: 2011/08/30 23:07:31
LM9074EP Enhanced Plastic System Voltage Regulator with Keep-Alive ON/OFF Control
(Top View) 14-Pin SO Package 20090802 See NS Package Number M14A www.national.com 2
Absolute Maximum Ratings (Note 4) 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 k Ω) 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 5) 12 kV, 2 kV Lead Temperature (Soldering, 10 seconds) 260°C Storage Temperature −50°C to +150°C Operating Ratings (Note 4) Input Voltage 7.5V to 16.5V Ambient Temperature −40°C to +125°C θja, M14A Package 88°C/W θjc, M14A Package 34°C/W
Electrical Characteristics
Symbol Parameter Conditions Min Max Units REGULATOR OUTPUT VOUT Output Voltage 20 mA ≤ IOUT ≤ 180 mA 4.85 5.15 V ΔVOUT Line Line Regulation IOUT = 20 mA, 9V ≤ VIN ≤ 16.5V IOUT = 20 mA, 7.5V ≤ VIN ≤ 16.5V mV mV ΔVOUT Load Load Regulation VIN = 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 VIN ≤ 16.5V, Regulator OFF −40°C ≤ TJ ≤ 60°C 60°C ≤ TJ ≤ 135°C μA μA Vdo Dropout Voltage IOUT = 20 mA IOUT = 180 mA 2.0 2.5 V V Isc Short Circuit Current RL = 1Ω 0.4 1.0 A PSRR Ripple Rejection VIN = (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 VOUT during Transients VIN Peak ≤ 40V, RL = 100Ω, τ = 100 ms 5.5 V RESET OUTPUT Vth Threshold Voltage ΔVOUT Required to Generate a Reset Output 4.85V ≤ VOUT ≤ 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 VOUT 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 kΩ CONTROL LOGIC VKAlow Low Input Threshold Voltage, Keep-Alive Input 3.5V ≤ VOUT ≤ 5.25V 0.3 VOUT 0.5 VOUT V 3 www.national.com
Symbol Parameter Conditions Min Max Units VKAhigh High Input Threshold Voltage, Keep-Alive Input 3.5V ≤ VOUT ≤ 5.25V 0.6 VOUT 0.8 VOUT V 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, Keep- Alive 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
Typical Performance Characteristics (TA = 25°C unless indicated otherwise) Turn ON Characteristics 20090806 Turn OFF Characteristics 20090807 Reset Delay Time vs Temperature 20090813 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 V OUT as the regulator turns OFF. Simple ON/OFF control (Keep-Alive input must be high to turn OFF output) 20090818 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) 20090819 5 www.national.com
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) 20090820 Safety Latch OFF of VOUT when in Keep-Alive Mode (ON/OFF going high required to turn Output back ON) 20090821 Control Logic Truth Table ON/OFF Input Keep-Alive Input Output Voltage Reset Output Operating Condition L X 0V L Low quiescent current standby (OFF) condition ↑ X 5V ↑ 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) 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
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 recom- mended). 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 battery drops to less than 60 μA. With the possibility in many appli- 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. 20090823 FIGURE 1. Typical Application Circuit
and revert to the low quiescent current standby mode. less than a 60 μA load on the battery. FIGURE 2. Control Logic Not Used
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 LM9074EP. Closing the ON/OFF switch powers ON the system. Once powered, the system controller sets the Keep-Alive line low. The NPN tran- sistor 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 input line, the controller can then perform a power down routine. The system will remain fully powered until the controller com- mands 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. 20090825 9 www.national.com
Physical Dimensions inches (millimeters) unless otherwise noted 14-Lead (0.150" Wide) Molded SO Package www.national.com 10
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200908 Version 2 Revision 2 Print Date/Time: 2011/08/30 23:07:32
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