LM9072

LM9072 NSC | Alldatasheet

Document overview

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Technical content

Features

n Two 5V regulated outputs: — 350 mA, 2% Main output — 80 mA, 1.5% Tracking output n Good EMI (1 MHz to 400 MHz, BCI) immunity n Separate ON/OFF and Keep-Alive control inputs n Less than 100 µA quiescent current in OFF state n Programmable delayed reset output n Input transient protection over 60V to −45V n Tracking output protected from shorts to battery n Less than 1V dropout at full load n −40˚C to +125˚C operating temperature range n Surface mount TO-263 Power Package and Standard TO-220 power package Typical Applications n Automotive module supply power conditioning n Remote sensor biasing n Ratiometric to supply sensor detection n Continuous operation for save routines and EPROM programming after power down command n Safety related systems — EMC operational Connection Diagrams and Ordering Information 9-Lead TO-263 Surface Mount Power Package DS012906-2 Backside metal is internally connected to ground. Order Number LM9072S See NS Package Number TS9A 9-Lead TO-220 Package DS012906-3 Tab is internally connected to ground. Order Number LM9072T See NS Package Number TA9A December 1999 LM9072 Dual Tracking Low-Dropout System Regulator © 1999 National Semiconductor Corporation DS012906 www.national.com

Absolute Maximum Ratings(Note 1) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Input Voltage (Continuous) −45V to 45V Input Voltage (Transient, t≤ 400 ms) 60V Forced Output Voltages Main Output −0.3V to 7V Tracking Output −0.3V to 27V ON/OFF Input Voltage (Note 6) −0.3V to 16V ON/OFF Input Current ± 20 mA Keep Alive In, Reset Out, C DELAY Voltage −0.3V to 7V Junction Temperature 150˚C Storage Temperature Range −65˚C to +150˚C ESD Susceptibility (Note 2) 2000V Lead Temperature (Soldering, 10 seconds) 265˚C Operating Ratings(Note 1) Input Voltage Range 6V to 27V Ambient Temperature Range −40˚C to +125˚C Thermal Resistance,θ J-C 4˚C/W Thermal Resistance,θJ-A 43˚C/W

Electrical Characteristics

6.0V ≤ VIN ≤ 19V, TCASE = 25˚C, unless otherwise specified. COUT ≥ 6 µF with 0.3Ω≤ ESR ≤ 3Ω on each regulator output. Symbol Parameter Conditions Min Max Units MAIN REGULATOR V MAIN Output Voltage 5 mA ≤ ILOAD ≤ 350 mA 4.9 5.1 V 19V ≤ VIN ≤ VSD , 5m A ≤ ILOAD ≤ 350 mA 4.8 5.2 V R MLOAD Load Regulation V IN = 16V, 5 mA≤ ILOAD ≤ 350 mA 25 mV R MLINE Line Regulation I LOAD = 350 mA, 8V≤ VIN ≤ 16V 25 mV VMDO Dropout Voltage, VIN–V MAIN VIN > 5.5V, 5 mA≤ ILOAD ≤ 350 mA (Note 5) 0.8 V VSD Overvoltage Shutdown Threshold 30 36 V IMSC Output Short Circuit Current R L = 1Ω 450 1000 mA R MRR Ripple Rejection V IN = 9V, 50≤ Freq ≤ 20 kHz, VRIPPLE = 4VP-P 40 dB TRACKING REGULATOR VTRACK Output Voltage 1 mA ≤ ILOAD ≤ 80 mA 4.85 5.15 V 19V ≤ VIN ≤ VSD 1m A ≤ ILOAD ≤ 80 mA 4.725 5.275 V VERROR Output Tracking Error (VMAIN –V TRACK ) 1m A ≤ ILOAD ≤ 80 mA −50 50 mV VTDO Dropout Voltage, VIN–V TRACK VIN > 5.5V, 1 mA≤ ILOAD ≤ 80 mA (Note 5) 0.8 V VSD Overvoltage Shutdown Threshold 30 36 V ITSC Output Short Circuit Current R L = 1Ω 200 mA VTSC Output Short Circuit Voltage No Effect On Other Functions −2 27 V R TRR Ripple Rejection V IN = 9V, 50≤ Freq ≤ 20 kHz, VRIPPLE = 4VP-P 40 dB INPUT CURRENT IqOFF Quiescent Input Current with Both Regulators OFF 8V ≤ VIN ≤ 16V 40 µA 16V ≤ VIN ≤ 42V 10 mA Iq No Load Quiescent Current 8V ≤ VIN ≤ 19V, IL = 0m A 1 5 m A InON Additional Input Current with Both Regulators ON VIN > 8V, ILtotal= ILmain +ILtrack ILtotal= 3 5 0m A+8 0m A= 430 mA 1.2 x I Ltotal Iindo Additional Input Current in Dropout 0V< VIN < 8V, (Note 4) ILtotal= ILmain +ILtrack ILtotal= 3 5 0m A+8 0m A= 430 mA 1.5 x I Ltotal LM9072 www.national.com 2

Electrical Characteristics(Continued) 6.0V ≤ VIN ≤ 19V, TCASE = 25˚C, unless otherwise specified. COUT ≥ 6 µF with 0.3Ω≤ ESR ≤ 3Ω on each regulator output. Symbol Parameter Conditions Min Max Units RESET OUTPUT V THRL Low Switching Threshold V MAIN Output Controls Reset 4.45 4.75 V VTHRH High Switching Threshold V MAIN Output Controls Reset 5.40 5.75 V VLOW Logic Low Output Voltage 1V ≤ VMAIN ≤ VTHRL , R RESET = 50 kΩ to VMAIN 0.4 V VHIGH Logic High Output Voltage Normal Operation, VTHRL ≤ VMAIN ≤ VTHRH ,ISOURCE = 0 VMAIN – 50 mV VMAIN V R P-U Internal Output Pull-Up Resistance 2.4 6.0 k Ω TDELAY Reset Delay Interval C DELAY = 0.1 µF (Low Leakage), IDELAY for Charging the Delay Capacitor is Typically 6 µA 35 70 ms TRISE Output Rise Time From 10 % VMAIN to 90% VMAIN C LRESET = 50 pF 1.5 µs TFALL Output Fall Time From 90 % VMAIN to 10% VMAIN C LRESET = 50 pF 0.5 µs CONTROL INPUTS VON ON Threshold for ON/OFF Input R SERIES = 22 kΩ 3.5 4.5 V VOFF OFF Threshold for ON/OFF Input R SERIES = 22 kΩ (Note 3) 1.5 2.5 V ION/OFF ON/OFF Input Current 1.4V ≤ VON/OFF ≤ 4.5V 1 12 µA −0.3V ≤ VON/OFF ≤ 7V (Note 6) −1 5 mA ON K-A Turn ON Threshold for Keep Alive Input 2V OFF K-A Turn OFF Threshold for Keep Alive Input (Note 3) 0.8 V R P-D Pull-Down Resistance at Keep Alive Input 0V ≤ VK-A ≤ 5V 54 0 k Ω Note 1:Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device re- mains functional but do not guarantee specific performance limits. For guaranteed specifications and test conditions see the Electrical Characteristics. Note 2:Human body model, 150 pF capacitor discharged through a 1.5 kΩ resistor. Note 3:If either control input is left open circuited the regulators will turn OFF. Note 4:The input quiescent current will increase when the regulators are in dropout conditions. The amount of additional input currents is a direct functionof the total load current on both outputs. The peak increase in current is limited to 50% of the total load current. Note 5:The dropout voltage specifications actually indicate the saturation voltage of the PNP power transistors used in each regulator. Over the full load current and temperature ranges both regulators will output at least 4.7V with an input voltage of only 5.5V. Note 6:The ON/OFF input is internally clamped to a 7V zener diode througha1k Ω resistor. LM9072 www.national.com3

Typical Performance Characteristics(TA = 25˚C unless otherwise specified) Turn-ON Characteristic DS012906-4 Turn-OFF Characteristic DS012906-5 Normalized Main Output Voltage vs Temperature DS012906-6 Quiescent Input Current vs Input Voltage DS012906-7 Main Output Voltage at Input Voltage Extremes DS012906-8 Input Current vs Input Voltage (Regulators OFF) DS012906-9 Tracking Output Short Circuit Current DS012906-10 Main Regulator Dropout Voltage vs Load Current DS012906-11 Output Short Circuit Current vs Temperature DS012906-12 LM9072 www.national.com 4

Typical Performance Characteristics(TA = 25˚C unless otherwise specified) (Continued) Operational Characteristics Control Logic Truth Table ON/OFF Input Keep-Alive Input Main Output Voltage Tracking Output Voltage Reset Output Operating Condition L L 0V 0V 0V OFF, Input Current < 100 µA ↑ L5 V 5 V ↑ After Delay Outputs Turn ON, Power ON Delayed Reset H X 5V 5V 5V Normal ON Condition HX < 4.45V < 4.45V 0V Main Output Pulled Out of Regulation, Reset Flag Generated ↓ H 5V 5V 5V Keep-Alive, Continued Normal Operation L ↑ 5V 5V ↑ After Delay Outputs Turned ON by Keep-Alive Input Reverse Battery Input Current DS012906-13 Maximum Power Dissipation DS012906-14 Output Capacitor ESR DS012906-15 DS012906-16 LM9072 www.national.com5

Application Information

PIN DESCRIPTION AND FUNCTIONALITY The LM9072 is a precision dual tracking voltage regulator optimized for use in powertrain module applications but will also find use in a wide variety of automotive and industrial applications where precision supply regulation is required in harsh operating environments. The following will describe the functionality of each of the package pins. INPUT VOLTAGE (Pin 3) The LM9072 has been designed to connect directly to the ig- nition or battery supply in automotive applications. For this type of supply the regulator has been designed to withstand up to +60V and −45V supply transients such as load dump. An overvoltage shut down protection scheme turns OFF both of the regulator outputs should supply transients ex- ceed typically +33V to fully protect all load circuitry. This higher threshold allows normal operation with 24 V DC ap- plied to the input as in the event when two batteries are used to start a vehicle. Protection of the system is also provided for inadvertent reverse polarity battery connections. The current drain on the supply line is directly proportional to the load currents on the two voltage regulators. With no load current on either output the regulator requires 15 mA maxi- mum quiescent current for biasing internal circuitry. During dropout conditions (V IN < 5.5V) the additional input current can rise to 50% of the total load current. With less than 4V applied to the input, internal biasing circuitry shuts OFF. When switchedOFF the regulator can remain connected to the battery supply with a current drain of less than 100 µA. MAIN OUTPUT (Pin 9) The Main Output regulator provides a well controlled (3% tol- erance maximum) 5V supply line with a total load current ranging up to 350 mA. This relatively high level of output cur- rent is sufficient to provide power to a large number of load circuits in a variety of module applications. This output has a short to ground current limit between 500 mA and 1A. The Main output can also withstand a short circuit to potentials up to 7V. To maintain stability of this supply line an output bypass ca- pacitor is required. This capacitor must be at least 6 µF with an equivalent series resistance (ESR) between 0.3Ω and 3Ω over temperature. The Main Output is sensed for the generation of the system reset output. Feedback from the Main Output is also used to control the output voltage of the tracking regulator. TRACKING OUTPUT (Pin 4) The Tracking Output regulator is a key feature of the LM9072. This output provides a voltage that directly tracks the main output voltage within 1.5% . This 80 mA output is provided to bias sensors and other devices located external to the main system module. For providing remote power the Tracking Output is fully pro- tected against short circuit connections to the battery or input supply (up to 27V) and to ground. These shorted fault condi- tions do not affect the operation of the main supply nor gen- erate a reset of the system. The tracking characteristic allows for ratiometric operation of sensors by providing power that is directly proportional to the system supply. Similar to the main output a bypass capacitor is required for stability. This capacitor should also be greater than 6 µF with an ESR between 0.3Ω and 3Ω . DS012906-17 FIGURE 1. Circuit Block Diagram

FIGURE 4. Basic Keep-Alive Operation

2 MHz (from 10 MHz to 200 MHz)

20 MHz (from 200 MHz to 400 MHz)

of wire most likely to pick up high frequency energy. FIGURE 8. Typical TO-263 PC Board Heatsinking

Physical Dimensionsinches (millimeters) unless otherwise noted Order Number LM9072T LM9072 www.national.com 14

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 Order Number LM9072S LM9072 Dual Tracking Low-Dropout System Regulator 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.