LM3940 LCC4 LCC20 1 AMP LOW DROPOUT REGULATOR FOR 5V TO 3.3V CONVERSION FEATURES TO-213AA (TO-66) TO-204AA (TO-3) • OUTPUT VOLTAGE SPECIFIED OVER TEMPERATURE RANGE • EXCELLENT LOAD REGULATION • GUARANTEED 1A OUTPUT CURRENT • BUILT IN PROTECTION AGAINST EXCESS TEMPERATURE SMD1 (TO-276AB) SMD05 (TO-276AA) TO-258AA TO-257AA • SHORT CIRCUIT PROTECTED The LM3940 is a 1A low dropout regulator designed to provide 3.3V from a 5V supply. It is a true low dropout regulator, it can hold its 3.3V output in regulation with input voltages as low as 4.5V. The regulator is available in a variety of hermetically sealed packages and has the option of being screened to both JAN and Space levels LCC28 ABSOLUTE MAXIMUM RATINGS1 (Tcase = 25°C unless otherwise stated) VI Maximum Input Supply Voltage 7.5V VO Nominal Output Voltage 3.3V IO Output Current PD Power Dissipation TJ Operating Junction Temperature Range –40 to +125°C TSTG Storage Temperature –65 to 150°C 1A See Table Semelab Plc reserves the right to change test conditions, parameter limits and package dimensions without notice. Information furnished by Semelab is believed to be both accurate and reliable at the time of going to press. However Semelab assumes no responsibility for any errors or omissions discovered in its use. Semelab encourages customers to verify that datasheets are current before placing orders. Semelab plc. Telephone +44(0)1455 556565. Fax +44(0)1455 552612. E-mail: [email protected] Website: http://www.semelab.co.uk Document Number 5282 Issue 1 LM3940 Electrical Characteristics Parameter Test Conditions Min Typ Max Units 3.13 V VOUT Output Voltage 5mA ≤ IL ≤ 1A 3.3 3.47 ∆VOUT IL = 5mA 20 40 50mA ≤ IL ≤ 1A 35 80 IL(DC) = 100mA, IL(AC) = 20mA(rms), f = 120Hz 35 4.5V VIN 5.5V, IL = 5mA 10 20 VIN 5V, IL = 5mA 110 250 BW = 10Hz-100kHz, IL = 5mA 150 IL = 1A 0.5 1.0 V IL = 100A 110 200 mV ∆VIN ∆VOUT ∆IOUT ZO IQ Line Regulation mV Load Regulation 1 Output impedance mΩ mA Quiescent Current en Output Noise Voltage VO-VIN Dropout Voltage2 IL (SC) RL = 0 1.2 µV (rms) 1.7 A Thermal Characteristics Package Style θJC Rθ θJA Rθ TO-204AA (TO-3) 4.0 oC/W 50 oC/W TO-213AA (TO-66) 4.5 oC/W 55 oC/W SMD05 (TO-276AA) 4.75 oC/W 65 oC/W Thermal Resistance (Junction to Ambient) SMD1 (TO-276AB) 4.75 oC/W 65 oC/W And TO-257AA 5.0 oC/W 65 oC/W TO-258AA 4.5 oC/W 55 oC/W LCC4 20 oC/W 150 oC/W LCC20 25 oC/W 165 oC/W LCC28 22 oC/W 160 oC/W Parameter Thermal Resistance (Junction to Case)3 1) Absolute maximum ratings indicate limits beyond which damage to the component may occur. Electrical specifications do not apply when operating the device outside of its rated operating conditions. 2) Dropout voltage is defined as the input-output differential voltage where the regulator output drops to a value that is 100 mV below the value that is measured at VIN = 5V. 3) Exceeding the maximum allowable power dissipation will cause excessive die temperature, and the regulator will go into thermal shutdown. Semelab Plc reserves the right to change test conditions, parameter limits and package dimensions without notice. Information furnished by Semelab is believed to be both accurate and reliable at the time of going to press. However Semelab assumes no responsibility for any errors or omissions discovered in its use. Semelab encourages customers to verify that datasheets are current before placing orders. Semelab plc. Telephone +44(0)1455 556565. Fax +44(0)1455 552612. E-mail: [email protected] Website: http://www.semelab.co.uk Document Number 5282 Issue 1 LM3940 0.89 (0.035) min. 7.54 (0.296) 0.76 (0.030) 3.70 (0.146) 3.41 (0.134) min. 2.41 (0.095) 3.175 (0.125) Max. 2.41 (0.095) 3.70 (0.146) 3.41 (0.134) 3.60 (0.142) Max. 3 16.02 (0.631) 15.73 (0.619) 1 10.69 (0.421) 10.39 (0.409) 10.16 (0.400) 5.72 (.225) 2 4.14 (0.163) 3.84 (0.151) 3 0.76 (0.030) min. 1 0.76 (0.030) min. 3.05 (0.120) 0.127 (0.005) 2 0.127 (0.005) 0.127 (0.005) 16 PLCS 0.50(0.020) 9.67 (0.381) 9.38 (0.369) 0.50 (0.020) max. 0.50 (0.020) 0.26 (0.010) 11.58 (0.456) 11.28 (0.444) 7.26 (0.286) Pin 1 – ADJ Pin 2 – VOUT Pin 3 – VIN Pin 1 – ADJ Pin 2 – VOUT Pin 3 – VIN Ceramic Surface Mount –SMD05 (TO-276AA) Ceramic Surface Mount –SMD1 (TO-276AB) 5 .0 8 (.2 0 0 ) 7.62(.300) 1.27(.050) REF 1 .2 7 (.0 5 0 ) R E F 1.27(.050) REF 1 .2 7 (.0 5 0 ) R E F 5 .0 8 (.2 0 0 ) 7.62(.300) P IN 1 IN D E X 1 1 .9 1 (.0 7 5 ) 0.64(.025) REF 1.91(.075) 0 .6 4 (.0 2 5 ) R E F 2.16(.085) 1 .9 1 (.0 7 5 ) 1 .6 0 (.0 6 3 ) 2 .1 6 (.0 8 5 ) 25 1 8 PIN 1 INDEX 1 1.91(.075) 1.60(.063) 19 1 4 18 28 1 3 1 2 0 1 12 9 5 4 11 8 8 .8 9 (.3 5 0 ) 11.44(.450) SQ S Q Pin 1 – ADJ Pin 2 – VOUT Pin 3 – VIN Pin 1 – ADJ Pin 2 – VOUT Pin 3 – VIN LCC20 (Z) Package –Ceramic Surface Mount LCC28 (Y) Package –Ceramic Surface Mount 9.14 (0.360) 8.64 (0.340) 1.27 (0.050) 1.07 (0.040) ≈ 2.16 (0.085) 12 13 14 15 16 1.39 (0.055) 1.02 (0.040) 7.62 (0.300) 7.12 (0.280) 11 17 10 18 9 1 8 2 7 6 5 1.39 (0.055) 1.15 (0.045) 4 3 1.65 (0.065) 1.40 (0.055) 0.76 (0.030) 0.51 (0.020) Pins 4,5 – Adjust Pins 6,7,8,9,10,11,12,13 – VIN Pin 15,16,17,18,1,2 – VOUT E Package - CERAMIC SURFACE MOUNT 0.33 (0.013) Rad. 0.08 (0.003) 0.43 (0.017) 0.18 (0.007 Rad. Semelab Plc reserves the right to change test conditions, parameter limits and package dimensions without notice. Information furnished by Semelab is believed to be both accurate and reliable at the time of going to press. However Semelab assumes no responsibility for any errors or omissions discovered in its use. Semelab encourages customers to verify that datasheets are current before placing orders. Semelab plc. Telephone +44(0)1455 556565. Fax +44(0)1455 552612. E-mail: [email protected] Website: http://www.semelab.co.uk Document Number 5282 Issue 1 LM3940 4 0 .0 1 (1 .5 7 5 ) M a x . 6.35 (0.250) 8.64 (0.340) 3.68 (0.145) rad. max. 4 .4 7 (0 .1 7 6 ) R a d . 2 P ls . 3 0 .4 0 (1 .1 9 7 ) 2 9 .9 0 (1 .1 7 7 ) 4 .0 9 (0 .1 6 1 ) 3 .8 4 (0 .1 5 1 ) 2 P ls 1 2 14.48 (0.570) 14.99 (0.590) 24.13 (0.95) 24.63 (0.97) 1 1 .4 3 (0 .4 5 0 ) 6 .3 5 (0 .2 5 0 ) 1 2 .1 9 (0 .4 8 ) 1 .6 3 (0 .0 6 4 ) 1 1 .1 8 (0 .4 4 ) 1 .5 2 (0 .0 6 0 ) 1 .5 7 (0 .0 6 2 ) 1 .4 7 (0 .0 5 8 ) D ia . 0.71 (0.028) 0.86 (0.034) 2 2 .2 3 (0 .8 7 5 ) M a x . 11.94 (0.470) 12.70 (0.500) 2 6 .6 7 (1 .0 5 0 ) M a x . 3.61 (0.142) 4.08(0.161) rad. 1 1 .1 8 (0 .4 4 0 ) 1 0 .6 7 (0 .4 2 0 ) 1.27 (0.050) 1.91 (0.750) 4.83 (0.190) 5.33 (0.210) 9.14 (0.360) min. 1 6 .9 7 (0 .6 6 8 ) 1 6 .8 7 (0 .6 6 4 ) Pin 1 – ADJ Pin 2 – VOUT Pin 3 – VIN Pin 1 – ADJ Pin 2 – VOUT Pin 3 – VIN K Package –TO-204AA (TO-3) R Package –TO-213AA (TO-66) 4.83 (0.190) 5.08 (0.200) 6.86 (0.270) 6.09 (0.240) 17.65 (0.695) 17.39 (0.685) 0.89 (0.035) 1.14 (0.045) 1.14 (0.707) 0.88 (0.035) 1 2 3 21.21 (0.835) 20.70 (0.815) 4.19 (0.165) 3.94 (0.155) Dia. 12.07 (0.500) 19.05 (0.750) 19.05 (0.750) 12.70 (0.500) 1 2 3 13.84 (0.545) 13.58 (0.535) 17.96 (0.707) 17.70 (0.697) 3.56 (0.140) Dia. 3.81 (0.150) 10.41 (0.410) 10.92 (0.430) 16.38 (0.645) 16.89 (0.665) 13.38 (0.527) 13.64 (0.537) 10.41 (0.410) 10.67 (0.420) 0.64 (0.025) Dia. 0.89 (0.035) 2.54 (0.100) BSC 3.05 (0.120) BSC 5.08 (0.200) BSC 3.56 (0.140) BSC 1.65 (0.065) 1.39 (0.055) Typ. Pin 1 – ADJ Pin 2 – VOUT Pin 3 – VIN Pin 1 – ADJ Pin 2 – VOUT Pin 3 – VIN G/IG Package –TO-257AA (TO-220) H Package –TO-258AA Semelab Plc reserves the right to change test conditions, parameter limits and package dimensions without notice. Information furnished by Semelab is believed to be both accurate and reliable at the time of going to press. However Semelab assumes no responsibility for any errors or omissions discovered in its use. Semelab encourages customers to verify that datasheets are current before placing orders. Semelab plc. Telephone +44(0)1455 556565. Fax +44(0)1455 552612. E-mail: [email protected] Website: http://www.semelab.co.uk Document Number 5282 Issue 1