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LM3503 Datasheet(PDF) 5 Page - National Semiconductor (TI) |
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LM3503 Datasheet(HTML) 5 Page - National Semiconductor (TI) |
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5 / 20 page  Absolute Maximum Ratings (Note 1) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. V IN Pin −0.3V to +5.5V Sw Pin −0.3V to +48V Fb Pin −0.3V to +5.5V Cntrl Pin −0.3V to +5.5V V OUT1Pin −0.3V to +48V V OUT2 Pin −0.3V to V OUT1 En1 −0.3V to +5.5V En2 −0.3V to +5.5V Continuous Power Dissipation Internally Limited Maximum Junction Temperature (T J-MAX) +150˚C Storage Temperature Range −65˚C to +150˚C ESD Rating (Note 2) Human Body Model: Machine Model: 2kV 200V Operating Conditions (Notes 1, 6) Junction Temperature (T J) Range −40˚C to +125˚C Ambient Temperature (T A) Range −40˚C to +85˚C Supply Voltage, V IN Pin 2.5V to 5.5V En1 and En2 Pins 0V to 5.5V Cntrl Pin 0V to 3.5V Thermal Properties (Note 4) Junction-to-Ambient Thermal Resistance ( θ JA) Micro SMD Package 65˚C/W Leadless Leadframe Package 49˚C/W Electrical Characteristics (Notes 6, 7) Limits in standard typeface are for T J = +25˚C. Limits in bold type- face apply over the full operating junction temperature range (−40˚C ≤ T J ≤ +125˚C). Unless otherwise specified,V IN = 2.5V. Symbol Parameter Conditions Min Typ Max Units V IN Input Voltage 2.5 5.5 V I Q Non-Switching Switching Shutdown Cntrl = 1.6V Fb = 0V, Sw Is Floating En1=En2=0V 0.5 1.9 0.1 1 3 3 mA mA µA V Fb Feedback Voltage Cntrl = 3.5V 0.5 0.55 0.6 V I CL NMOS Power Switch Current Limit 16, Fb = 0V 25, Fb = 0V 35, Fb = 0V 44,FB = 0V 250 400 450 450 400 600 750 750 650 800 1050 1050 mA I Fb Feedback Pin Output Bias Current Fb = 0.25V, Cntrl = 1.6V 64 500 nA F S Switching Frequency 0.8 1 1.2 MHz R DS(ON) NMOS Power Switch ON Resistance (Figure 1: N1) I Sw = 500 mA, (Note 8) 0.55 1.1 Ω R PDS(ON) PMOS ON Resistance Of V OUT1/VOUT2 Switch (Figure 1: P1) I PMOS = 20 mA, En1 = 0V, En2 = 1.5V 5 10 Ω R NDS(ON) NMOS ON Resistance Of V OUT2/Fb Switch (Figure 1: N2) I NMOS = 20 mA, En1 = 1.5V, En2 = 0V 2.5 5 Ω D MAX Maximum Duty Cycle Fb = 0V 90 95 % I Sw Sw Pin Leakage Current (Note 3) Sw = 42V, En1 = En2 =0V 0.01 5 µA I VOUT1(OFF) V OUT1 Pin Leakage Current (Note 3) V OUT1 = 14V, En1 = En2 = 0V (16) V OUT1 = 23V, En1 = En2 = 0V (25) V OUT1 = 32V, En1 = En2 = 0V (35) V OUT1 = 42V, En1 = En2 = 0V (44) 0.1 0.1 0.1 0.1 3 3 3 3 µA I VOUT1(ON) V OUT1 Pin Bias Current (Note 3) V OUT1 = 14V, En1 = En1 = 1.5V (16) V OUT1 = 23V, En1 = En2 = 1.5V (25) V OUT1 = 32V, En1 = En2 = 1.5V (35) V OUT1 = 42V, En1 = En2 = 1.5V (44) 40 50 50 85 80 100 100 140 µA www.national.com 5 |
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