LM2936-3.3 Ultra-Low Quiescent Current 3.3V Regulator General Description Features The LM2936-3.3 ultra-low quiescent current regulator features low dropout voltage and low current in the standby mode. With less than 20 µA quiescent current at a 100 µA load, the LM2936-3.3 is ideally suited for automotive and other battery operated systems. The LM2936-3.3 retains all of the features that are common to low dropout regulators including a low dropout PNP pass device, short circuit protection, reverse battery protection, and thermal shutdown. The LM2936-3.3 has a 40V maximum operating voltage limit, a −40˚C to +125˚C operating temperature range, and ± 3% output voltage tolerance over the entire output current, input voltage, and temperature range. The LM2936-3.3 is available in a TO-92 package, a SO-8 surface mount package, as well as SOT-223 and TO-252 surface mount power packages. n n n n n n n n n n n n Ultra low quiescent current (IQ ≤ 20 µA for IO = 100 µA) Fixed 3.3V, 50 mA output ± 2% Initial output tolerance ± 3% Output tolerance over line, load, and temperature Dropout voltage typically 200 mV @ IO = 50 mA Reverse battery protection −50V reverse transient protection Internal short circuit current limit Internal thermal shutdown protection 40V operating voltage limit 60V operating voltage limit for LM2936HV Shutdown pin available with LM2936BM package Typical Application 10132401 * Required if regulator is located more than 2" from power supply filter capacitor. ** Required for stability. Must be rated for 22 µF minimum over intended operating temperature range. Effective series resistance (ESR) is critical, see curve. Locate capacitor as close as possible to the regulator output and ground pins. Capacitance may be increased without bound. Connection Diagrams TO-252 SOT-223 10132426 10132425 Top View Order Number LM2936DT-3.3 See NS Package Number TD03B © 2002 National Semiconductor Corporation DS101324 Top View Order Number LM2936MP-3.3 See NS Package Number MA04A www.national.com LM2936-3.3 Ultra-Low Quiescent Current 3.3V Regulator June 2002 LM2936-3.3 Connection Diagrams (Continued) 8-Pin SO (M) TO-92 10132402 Bottom View Order Number LM2936Z-3.3 See NS Package Number Z03A 10132406 Top View Order Number LM2936M-3.3 See NS Package Number M08A 8-Pin SO (M) 8-Pin Mini SOIC (MM) 10132429 Top View Order Number LM2936MM-3.3 See NS Package Number MUA08A 10132428 Top View Order Number LM2936BM-3.3, LM2936HVBMA-3.3 See NS Package Number M08A www.national.com 2 Maximum Operating Input Voltage LM2936 (Note 1) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Input Voltage (Survival) Maximum Operating Input Voltage LM2936HV only 2000V Power Dissipation (Note 3) Internally limited Junction Temperature (TJmax) Storage Temperature Range 150˚C −65˚C to +150˚C Lead Temperature (Soldering, 10 sec.) +60V Maximum Shutdown Pin Voltage LM2936BM only +60V, −50V ESD Susceptibility (Note 2) +40V 260˚C 0V to 40V MSO-8 (MUA08A) θJA 200˚C/W TO-92 (Z03A) θJA 195˚C/W SO-8 (M08A) θJA 140˚C/W SO-8 (M08A) θJC 45˚C/W TO-252 (TD03B) θJA 126˚C/W TO-252 (TD03B) θJC Operating Ratings Operating Temperature Range −40˚C to +125˚C 6˚C/W SOT-223 (MA04A) θJA 149˚C/W SOT-223 (MA04A) θJC 36˚C/W Electrical Characteristics VIN = 14V, IO = 10 mA, TJ = 25˚C, unless otherwise specified. Boldface limits apply over entire operating temperature range Min (Note 5) Typical (Note 4) Max (Note 5) Units 3.201 3.300 3.399 V 10 30 mV 3.234 3.300 3.366 3.201 3.30 3.399 IO = 100 µA, 8V ≤ VIN ≤ 24V 15 20 µA IO = 10 mA, 8V ≤ VIN ≤ 24V 0.20 0.50 mA IO = 50 mA, 8V ≤ VIN ≤ 24V 1.5 2.5 mA mV Parameter Conditions LM2936HV Only Output Voltage 5.5V ≤ VIN ≤ 48V, 100 µA ≤ IO ≤ 50 mA (Note 6) Line Regulation 6V ≤ VIN ≤ 60V, IO = 1mA All LM2936 Output Voltage 4.0V ≤ VIN ≤ 26V, 100µA ≤ IO ≤ 50mA (Note 6) Quiescent Current V Line Regulation 9V ≤ VIN ≤ 16V 5 10 6V ≤ VIN ≤ 40V, IO = 1 mA 10 30 Load Regulation 100 µA ≤ IO ≤ 5 mA 10 30 5 mA ≤ IO ≤ 50 mA 10 30 0.05 0.10 0.20 0.40 V 120 250 mA Dropout Voltage IO = 100 µA Short Circuit Current VO = 0V Output Impedance IO = 30 mAdc and 10 mArms, Output Noise Voltage 10 Hz–100 kHz IO = 50 mA 65 450 mV V mΩ f = 1000 Hz Long Term Stability 500 µV 20 mV/1000 Hr Ripple Rejection Vripple = 1 Vrms, fripple = 120 Hz −40 −60 dB Reverse Polarity RL = 500Ω, T = 1 ms −50 −80 V Transient Input Voltage Output Voltage with VIN = −15V, RL = 500Ω 0.00 −0.30 V Reverse Polarity Input Maximum Line Transient RL = 500Ω, VO ≤ 3.63V 60 Output Bypass Capacitance (COUT) ESR COUT = 22µF 0.1mA ≤ IOUT ≤ 50mA 0.3 3 30 8 Ω www.national.com LM2936-3.3 Absolute Maximum Ratings LM2936-3.3 Electrical Characteristics (Continued) VIN = 14V, IO = 10 mA, TJ = 25˚C, unless otherwise specified. Boldface limits apply over entire operating temperature range Parameter Min (Note 5) Conditions Typical (Note 4) Max (Note 5) 0 0.010 Units Shutdown Input - LM2936BM Only Output Voltage, VOUT Output Off, VSD = 2.4V Shutdown High Threshold Voltage, VIH Output Off, RLOAD = 500Ω Shutdown Low Threshold Voltage, VIL Output On, RLOAD = 500Ω 1.1 Shutdown High Current, IIH Output Off, VSD = 2.4V, RLOAD = 500Ω 12 µA Quiescent Current Output Off, VSD = 2.4V, RLOAD = 500Ω Includes IIH Current 30 µA 2.00 1.1 V V 0.60 V Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. DC and AC electrical specifications do not apply when operating the device beyond its specified operating ratings. Note 2: Human body model, 100 pF discharge through a 1.5 kΩ resistor. Note 3: The maximum power dissipation is a function of TJmax, θJA, and TA. The maximum allowable power dissipation at any ambient temperature is PD = (TJmax − TA)/θJA. If this dissipation is exceeded, the die temperature will rise above 150˚C and the LM2936 will go into thermal shutdown. Note 4: Typicals are at 25˚C (unless otherwise specified) and represent the most likely parametric norm. Note 5: Tested limits are guaranteed to National’s AOQL (Average Outgoing Quality Level) and 100% tested. Note 6: To ensure constant junction temperature, pulse testing is used. Typical Performance Characteristics Maximum Power Dissipation (TO-92) Dropout Voltage 10132407 10132408 Dropout Voltage Quiescent Current 10132409 www.national.com 10132410 4 LM2936-3.3 Typical Performance Characteristics (Continued) Quiescent Current Quiescent Current 10132412 10132411 Quiescent Current Quiescent Current 10132414 10132413 Output Capacitor ESR Peak Output Current 10132416 10132415 5 www.national.com LM2936-3.3 Typical Performance Characteristics (Continued) Peak Output Current Line Transient Response 10132417 10132419 Ripple Rejection Load Transient Response 10132421 10132422 Output Impedance 10132424 we find that PDmax = 641 mW at 25˚C. Including the small contribution of the quiescent current to total power dissipation the maximum input voltage (while still delivering 50 mA output current) is 15.3V. The LM2936Z-3.3 will go into thermal shutdown if it attempts to deliver full output current with an input voltage of more than 15.3V. Similarly, at 40V input and 25˚C ambient the LM2936Z-3.3 can deliver 15 mA maximum. Applications Information Unlike other PNP low dropout regulators, the LM2936 remains fully operational to 40V. Owing to power dissipation characteristics of the available packages, full output current cannot be guaranteed for all combinations of ambient temperature and input voltage. As an example, consider an LM2936Z-3.3 operating at 25˚C ambient. Using the formula for maximum allowable power dissipation given in (Note 3) , www.national.com 6 While the LM2936 has an internally set thermal shutdown point of typically 150˚C, this is intended as a safety feature only. Continuous operation near the thermal shutdown temperature should be avoided as it may have a negative affect on the life of the device. (Continued) Under conditions of higher ambient temperatures, the voltage and current calculated in the previous examples will drop. For instance, at the maximum ambient of 125˚C the LM2936Z-3.3 can only dissipate 128 mW, limiting the input voltage to 5.6V for a 50 mA load, or 3.0 mA output current for a 40V input. The junction to ambient thermal resistance θJA rating has two distinct components: the junction to case thermal resistance rating θJC; and the case to ambient thermal resistance rating θCA. The relationship is defined as: θJA = θJC + θCA. While the LM2936-3.3 will survive input transients to +60V, output regulation is not guaranteed for input voltages greater than 40V. The LM2936 will not withstand a output short circuit with the input above 40V because of safe operating area limitations in the internal PNP pass device. With input voltages above 60V the LM2936 will break down with catastrophic effects on the regulator and possibly the load as well. Do not use this device in a design where the input operating voltage may exceed 40V, or where transients are likely to exceed 60V. For the SO-8 and TO-252 surface mount packages the θJA rating can be improved by using the copper mounting pads on the printed circuit board as a thermal conductive path to extract heat from the package. Shutdown Pin The LM2936BM has a pin for shutting down the regulator output. Applying a Logic Level High ( > 2.0V) to the Shutdown pin will cause the output to turn off. Leaving the Shutdown pin open, connecting it to Ground, or applying a Logic Level Low ( < 0.6V) will allow the regulator output to turn on. On the SO-8 package the four ground pins are thermally connected to the backside of the die. Adding approximately 0.04 square inches of 2 oz. copper pad area to these four pins will improve the θJA rating to approximately 110˚C/W. If this extra pad are is placed directly beneath the package there should not be any impact on board density. On the TO-252 package the ground tab is thermally connected to the backside of the die. Adding 1 square inch of 2 oz. copper pad area directly under the ground tab will improve the θJA rating to approximately 50˚C/W. 7 www.national.com LM2936-3.3 Applications Information LM2936-3.3 Physical Dimensions inches (millimeters) unless otherwise noted 8-Lead Small Outline Molded Package (M) NS Package Number M08A TO-252 Package (DT) NS Package Number TD03B www.national.com 8 LM2936-3.3 Physical Dimensions inches (millimeters) unless otherwise noted (Continued) SOT-223 Package (MP) NS Package Number MA04A 3-Lead TO-92 Plastic Package (Z) NS Package Number Z03A 9 www.national.com LM2936-3.3 Ultra-Low Quiescent Current 3.3V Regulator Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 8-Lead Mini SOIC package (MM) NS Package Number MUA08A 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. 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