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LM3940
LCC20
LCC4
1 AMP LOW DROPOUT REGULATOR FOR 5V TO 3.3V CONVERSION
FEATURES
TO-204AA (TO-3)
TO-213AA (TO-66)
* OUTPUT VOLTAGE SPECIFIED OVER TEMPERATURE RANGE * EXCELLENT LOAD REGULATION * GUARANTEED 1A OUTPUT CURRENT * BUILT IN PROTECTION AGAINST EXCESS TEMPERATURE
SMD05 (TO-276AA)
SMD1 (TO-276AB)
* SHORT CIRCUIT PROTECTED
TO-257AA
TO-258AA
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 = 25C unless otherwise stated)
VI VO IO PD TJ TSTG Maximum Input Supply Voltage Nominal Output Voltage Output Current Power Dissipation Operating Junction Temperature Range Storage Temperature 7.5V 3.3V 1A See Table -40 to +125C -65 to 150C
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: sales@semelab.co.uk Website: http://www.semelab.co.uk
Document Number 5282 Issue 1
LM3940
Electrical Characteristics
Parameter
VOUT Output Voltage VOUT VIN VOUT IOUT Line Regulation 50mA IL 1A Load Regulation 1 IL(DC) = 100mA, IL(AC) = 20mA(rms), f = 120Hz 4.5V VIN 5.5V, IL = 5mA Quiescent Current VIN 5V, IL = 5mA Output Noise Voltage VO-VIN Dropout Voltage2 IL (SC) BW = 10Hz-100kHz, IL = 5mA IL = 1A IL = 100A RL = 0 1.2 110 150 0.5 110 1.7 1.0 200 250 V (rms) V mV A 35 10 20 mA m 35 80 mV 5mA IL 1A IL = 5mA
Test Conditions
Min
3.13
Typ
3.3 20
Max
3.47 40
Units
V
ZO
Output impedance
IQ en
Thermal Characteristics
Parameter Package Style
TO-204AA (TO-3) TO-213AA (TO-66) SMD05 (TO-276AA) Thermal Resistance (Junction to Ambient) And Thermal Resistance (Junction to Case)3 SMD1 (TO-276AB) TO-257AA TO-258AA LCC4 LCC20 LCC28
RJC
4.0 oC/W 4.5 oC/W 4.75 oC/W 4.75 oC/W 5.0 oC/W 4.5 oC/W 20 oC/W 25 oC/W 22 oC/W
RJA
50 oC/W 55 oC/W 65 oC/W 65 oC/W 65 oC/W 55 oC/W 150 oC/W 165 oC/W 160 oC/W
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: sales@semelab.co.uk Website: http://www.semelab.co.uk
Document Number 5282 Issue 1
LM3940
7.54 (0.296) 0.76 (0.030)
0.89 (0.035) min.
min.
2.41 (0.095) 2.41 (0.095) 0.127 (0.005)
3.175 (0.125) Max.
4.14 (0.163) 3.84 (0.151)
3.70 (0.146) 3.41 (0.134)
3.70 (0.146) 3.41 (0.134)
3.60 (0.142) Max.
3.05 (0.120)
0.76 (0.030) min.
0.76 (0.030) min.
1
3
10.16 (0.400)
1
3
2
10.69 (0.421) 10.39 (0.409)
5.72 (.225)
2
0.127 (0.005) 16 PLCS 0.50(0.020) 7.26 (0.286) 0.127 (0.005)
0.50 (0.020) max.
9.67 (0.381) 9.38 (0.369) 11.58 (0.456) 11.28 (0.444)
16.02 (0.631) 15.73 (0.619)
0.50 (0.020) 0.26 (0.010)
Pin 1 - ADJ Pin 2 - VOUT Pin 3 - VIN Ceramic Surface Mount -SMD05 (TO-276AA)
5 .0 8 (.2 0 0 ) 1 .2 7 (.0 5 0 ) REF 1 .2 7 (.0 5 0 ) REF P IN 1 IN D E X
1
Pin 1 - ADJ Pin 2 - VOUT Pin 3 - VIN Ceramic Surface Mount -SMD1 (TO-276AB)
7.62(.300) 1.27(.050) REF
1.27(.050) REF
7.62(.300)
1
PIN 1 INDEX
5 .0 8 (.2 0 0 ) 1 .9 1 (.0 7 5 )
0 .6 4 (.0 2 5 ) REF 2 .1 6 (.0 8 5 ) 1 .9 1 (.0 7 5 ) 1 .6 0 (.0 6 3 )
1.91(.075)
0.64(.025) REF
2.16(.085)
1.91(.075) 1.60(.063)
25
19
18
14 13
28 1
18
20 1 9
12
5
11
4 8
8 .8 9 (.3 5 0 ) SQ
11.44(.450) SQ
Pin 1 - ADJ Pin 2 - VOUT Pin 3 - VIN LCC20 (Z) Package -Ceramic Surface Mount
1.27 (0.050) 1.07 (0.040) 9.14 (0.360) 8.64 (0.340) 2.16 (0.085)
Pin 1 - ADJ Pin 2 - VOUT Pin 3 - VIN LCC28 (Y) Package -Ceramic Surface Mount
12 13 14 15 16
1.39 (0.055) 1.02 (0.040)
11
7.62 (0.300) 7.12 (0.280)
17 18 1 2
0.76 (0.030) 0.51 (0.020)
10 9 8
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
7
6
5
4
3
1.65 (0.065) 1.40 (0.055)
0.33 (0.013) Rad. 0.08 (0.003)
1.39 (0.055) 1.15 (0.045)
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: sales@semelab.co.uk Website: http://www.semelab.co.uk
Document Number 5282 Issue 1
LM3940
4 0 .0 1 (1 .5 7 5 ) M ax.
2 6 .6 7 (1 .0 5 0 ) M ax. 4 .4 7 (0 .1 7 6 ) Rad. 2 P ls .
3.68 (0.145) rad. max.
6.35 (0.250) 8.64 (0.340) 3.61 (0.142) 4.08(0.161) rad.
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 1 .1 8 (0 .4 4 0 ) 1 0 .6 7 (0 .4 2 0 )
14.48 (0.570) 14.99 (0.590)
1 .5 7 (0 .0 6 2 ) 1 .4 7 (0 .0 5 8 ) D ia .
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 )
24.13 (0.95) 24.63 (0.97)
1 1 .4 3 (0 .4 5 0 ) 6 .3 5 (0 .2 5 0 )
4.83 (0.190) 5.33 (0.210)
1 6 .9 7 (0 .6 6 8 ) 1 6 .8 7 (0 .6 6 4 )
1.27 (0.050) 1.91 (0.750) 9.14 (0.360) min.
Pin 1 - ADJ Pin 2 - VOUT Pin 3 - VIN K Package -TO-204AA (TO-3)
10.41 (0.410) 10.67 (0.420) 4.83 (0.190) 5.08 (0.200) 0.89 (0.035) 1.14 (0.045)
Pin 1 - ADJ Pin 2 - VOUT Pin 3 - VIN R Package -TO-213AA (TO-66)
17.65 (0.695) 17.39 (0.685) 6.86 (0.270) 6.09 (0.240) 1.14 (0.707) 0.88 (0.035)
16.38 (0.645) 16.89 (0.665)
17.96 (0.707) 17.70 (0.697)
13.84 (0.545) 13.58 (0.535)
123
12.07 (0.500) 19.05 (0.750)
123
4.19 (0.165) 3.94 (0.155) Dia.
0.64 (0.025) Dia. 0.89 (0.035) 2.54 (0.100) BSC 3.05 (0.120) BSC
19.05 (0.750) 12.70 (0.500)
5.08 (0.200) BSC 1.65 (0.065) 1.39 (0.055) Typ.
21.21 (0.835) 20.70 (0.815)
13.38 (0.527) 13.64 (0.537)
3.56 (0.140) Dia. 3.81 (0.150) 10.41 (0.410) 10.92 (0.430)
3.56 (0.140) BSC
Pin 1 - ADJ Pin 2 - VOUT Pin 3 - VIN G/IG Package -TO-257AA (TO-220)
Pin 1 - ADJ Pin 2 - VOUT Pin 3 - VIN 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: sales@semelab.co.uk Website: http://www.semelab.co.uk
Document Number 5282 Issue 1
11.94 (0.470) 12.70 (0.500)
1
2
0.71 (0.028) 0.86 (0.034)
2 2 .2 3 (0 .8 7 5 ) M ax.

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