LM2940S-3.3

1A LOW DROPOUT REGULATOR LM2940 FEATURES          Guaranteed Output Current of 1A Maximum Input Voltage 26V Low Dropout Voltage 400mV Low Ground Current Accurate 1% Guaranteed Tolerance Extremely Fast Transient Response Reverse Battery Protection Over-Temperature / Over-Current Protection Available in SOT-223-3L and TO-220-3L Package SOT-223-3L TO-220-3L APPLICATION      Battery Powered Equipment High-Efficiency “Green” Computer Systems Automotive Electronics High-Efficiency Linear Power Supplies High-Efficiency Post-Regulator For Switching Supply ORDERING INFORMATION Device Package LM2940S-X.X SOT-223-3L LM2940T-X.X TO-220-3L X.X = Output Voltage = 3.3V, 5.0V DESCRIPTION The LM2940 regulator features the ability to source 1A of output current with a dropout voltage of typically 0.4V and maximum of 0.63V over the entire temperature range. These device also finds applications in lower current, low dropout-critical systems, where their tiny dropout voltage and ground current values are important attributes. LM2940 is available as fixed 3.3V, 5.0V output voltages. The LM2940 is offered in a SOT-223-3L and TO-220-3L. ABSOLUTE MAXIMUM RATINGS (Note 1) CHARACTERISTIC SYMBOL MIN. MAX. UNIT VIN -20 30 V IOUT_MAX - 1 A Lead Temperature TSOL - 260 °C Storage Temperature Range TSTG -65 150 °C Operating Junction Temperature Range TOPR -40 125 °C SYMBOL MIN. MAX. UNIT VIN - 26 V TOPR -40 85 °C Input Supply Voltage (Survival) Maximum Output Current RECOMMENDED OPERATING RATINGS (Note 2) CHARACTERISTIC Input Supply Voltage Operating Junction Temperature Range Apr. 2019_Preliminary 1 /7 HTC 1A LOW DROPOUT REGULATOR LM2940 ORDERING INFORMATION VOUT 3.3V 5.0V LM Package Order No. Supplied As Status SOT-223-3L LM2940S-3.3 Reel Active TO-220-3L LM2940T-3.3 Tube Contact us SOT-223-3L LM2940S-5.0 Reel Active TO-220-3L LM2940T-5.0 Tube Contact us 2940 Output Voltage Package Type : 3.3V / 5.0V S : SOT-223-3L T : TO-220-3L Root Name Product Code Apr. 2019_Preliminary 2 /7 HTC 1A LOW DROPOUT REGULATOR LM2940 PIN CONFIGURATION SOT-223-3L TO-220-3L PIN DESCRIPTION SOT-223-3L / TO-220-3L Pin No. Name Function 1 VIN Input Voltage 2 GND Ground 3 VOUT Output Voltage Apr. 2019_Preliminary 3 /7 HTC 1A LOW DROPOUT REGULATOR LM2940 TYPICAL CIRCUIT VIN CIN*** 10uF VOUT VOUT VIN GND COUT**** 10uF * LM2940 can deliver a continuous current of 1A over the full operating temperature. However, the output current is limited by the restriction of power dissipation which differs from packages. A heat sink may be required depending on the maximum power dissipation and maximum ambient temperature of application. With respect to the applied package, the maximum output current of 1A may be still undeliverable. ** See Application Information. *** CIN : CIN must be at least 1uF or large to maintain stability. **** COUT : COUT must be at least 10uF or large to maintain stability. Apr. 2019_Preliminary 4 /7 HTC 1A LOW DROPOUT REGULATOR LM2940 ELECTRICAL CHARACTERISTICS (Note 3) Limits in standard typeface are for TJ = 25°C, and limits in boldface type apply over the full operating temperature range. Unless otherwise specified: VIN (Note 4) = VO(NOM) + 1V, IOUT = 5 mA, CIN = 10 μF, COUT = 10 μF PARAMETER Output Voltage Tolerance SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT IOUT = 5mA -1 - 1 % 5 mA ≤ IOUT ≤ 1A, (VOUT+1V) ≤ VIN ≤ 26V -2 - 2 % VO Line Regulation ΔVLINE IOUT = 5mA, (VOUT+1V) ≤ VIN ≤ 26V - 0.06 0.5 % Load Regulation ΔVLOAD VIN = VOUT +1V, 5 mA ≤ IOUT ≤ 1A - 0.2 1 % - - 100 ppm/°C IOUT = 5mA - 60 180 mV IOUT = 100mA - 170 - mV IOUT = 1A - 400 630 mV IOUT = 5mA - 250 500 μA IOUT = 1A - 16 25 mA VIN = 0.5V less than specified VOUT, IOUT = 5mA - 1 - mA VOUT = 0V - 1.5 - A Output Voltage Temperature Coefficient (Note 5) Dropout Voltage (Note 6) Ground Pin Current (Note 7) Ground Pin Current at Dropout Current Limit ΔVOUT /ΔT VDROP IGND IGNDDO ICL Note 1. Exceeding the absolute maximum ratings may damage the device. Note 2. The device is not guaranteed to function outside its operating ratings. Note 3. Stresses listed as the absolute maximum ratings may cause permanent damage to the device. These are for stress ratings. Functional operating of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may remain possibly to affect device reliability. Note 4. The minimum operating value for input voltage is equal to either (VOUT,NOM + VDROP), whichever is greater. Note 5. Output voltage temperature coefficient is defined as the worst case voltage change divided by the total temperature range. Note 6. Dropout voltage is defined as the minimum input to output differential voltage at which the output drops 1% below the nominal value. Note 7. Ground current, or quiescent current, is the difference between input and output currents. It's defined by I GND = IIN - IOUT under the given loading condition. The total current drawn from the supply is the sum of the load current plus the ground pin current. Apr. 2019_Preliminary 5 /7 HTC 1A LOW DROPOUT REGULATOR LM2940 APPLICATION INFORMATION Maximum Output Current Capability The LM2940 can deliver a continuous current of 1A over the full operating junction temperature range. However, the output current is limited by the restriction of power dissipation which differs from packages. A heat sink may be required depending on the maximum power dissipation and maximum ambient temperature of application. With respect to the applied package, the maximum output current of 1A may be still undeliverable due to the restriction of the power dissipation of LM2940. Under all possible conditions, the junction temperature must be within the range specified under operating conditions. The temperatures over the device are given by: TC = TA + PD X θCA / TJ = TC + PD X θJC / TJ = TA + PD X θJA where TJ is the junction temperature, T C is the case temperature, TA is the ambient temperature, PD is the total power dissipation of the device, θCA is the thermal resistance of case-to-ambient, θJC is the thermal resistance of junction-to-case, and θJA is the thermal resistance of junction to ambient. The total power dissipation of the device is given by: PD = PIN – POUT = (VIN X IIN)–(VOUT X IOUT) = (VIN X (IOUT+IGND)) – (VOUT X IOUT) = (VIN - VOUT) X IOUT + (VIN X IGND) where IGND is the operating ground current of the device which is specified at the Electrical Characteristics. The maximum allowable temperature rise (T Rmax) depends on the maximum ambient temperature (T Amax) of the application, and the maximum allowable junction temperature (T Jmax): TRmax = TJmax – TAmax The maximum allowable value for junction-to-ambient thermal resistance, θJA, can be calculated using the formula: θJA = TRmax / PD = (TJmax – TAmax) / PD LM2940 is available in SOT-223-3L package. The thermal resistance depends on amount of copper area or heat sink, and on air flow. If the maximum allowable value of θJA calculated above is over 137°C/W for SOT-223 -3L package, no heat sink is needed since the package can dissipate enough heat to satisfy these requirements. If the value for allowable θJA falls near or below these limits, a heat sink or proper area of copper plane is required. In summary, the absolute maximum ratings of thermal resistances are as follow: Absolute Maximum Ratings of Thermal Resistance Characteristic Symbol Rating Unit Thermal Resistance Junction-To-Ambient / SOT-223-3L θJA-SOT-223-3L 137 °C/W Thermal Resistance Junction-To-Ambient / TO-220-3L θJA-TO-220-3L 70 °C/W No heat sink / No air flow / No adjacent heat source / TA=25°C Apr. 2019_Preliminary 6 /7 HTC 1A LOW DROPOUT REGULATOR LM2940 REVISION NOTICE The version of this document is including preliminary information. Thus the description in this datasheet can be revised without any notice to describe its electrical characteristics properly. Its version also can be changed to a production level. Please contact us to get the latest version of datasheet. Apr. 2019_Preliminary 7 /7 HTC