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LM3557SD-2 Datenblatt(PDF) 3 Page - National Semiconductor (TI) |
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LM3557SD-2 Datenblatt(HTML) 3 Page - National Semiconductor (TI) |
3 / 11 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 +8V En Pin −0.3V to +8V Fb Pin −0.3V to +8V Sw2 Pin −0.3V to +8V Ovp Pin −0.3V to +30V Sw1 Pin −0.3V to +40V 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 150V 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 2.7V to 7.5V En Pin 0V to V IN +0.4V Thermal Properties (Notes 4, 7) Junction-to-Ambient Thermal 55˚C/W Resistance ( θ JA), Leadless Leadframe Package Electrical Characteristics (Notes 6, 8) 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 = 3.6V. Symbol Parameter Conditions Min Typ Max Units V IN Input Voltage 2.7 7.5 V I Q Quiescent Current V EN = 0V (Shutdown) V EN = 1.8V; VOVP = 27V (Non-Switching) 0.01 0.55 2 0.8 µA mA En Device Enable Threshold Device On Device Off 0.9 0.3 V I CL Power Switch Current Limit (Note 10) V IN =3V 0.4 0.55 0.8 0.8 1.1 1.02 A R DS(ON) Power Switch ON Resistance I Sw1 = 175 mA 800 1000 m Ω TC (R DS(ON)) R DS(ON) Temperature Coefficient 0.5 %/C OVP Over-Voltage Protection (Note 5) On Threshold Off Threshold 22 21.5 26 25.5 28.5 28 V UVP Under-Voltage Protection (Note 5) On Threshold Off Threshold 2.2 2.3 V I OVP Over-Voltage Protection Pin Bias Current (Note 3) 4 10 µA I EN Enable Pin Bias Current (Note 3) V EN = 1.8V 0.8 3 µA F S Switching Frequency V IN =3V 0.9 1.25 1.6 MHz V Fb-Sw2 Feedback Pin Voltage (Note 9) 0.459 0.51 0.561 V I Fb Feedback Pin Bias Current (Note 3) 0.03 2 µA D MAX Maximum Duty Cycle V IN =3V 85 90 % I LSw1 Sw1 Pin Leakage Current (Note 3) V Sw1 = 3.6V, Not Switching 0.002 2 µA I LSw2 Sw2 Pin Leakage Current (Note 3) V Sw2 = 3.6V, Not Switching 0.001 1 µA I LOVP Ovp Pin Leakage Current (Note 3) V Ovp = 3.6V, Not Switching 2nA R Sw2 Sw2 Pin Switch Resistance I Sw2 =50mA 8 10 Ω TC(R Sw2)RSw2 Temperature Coefficient 0.5 %/C Note 1: Absolute maximum ratings indicate limits beyond which damage to the device may occur. Electrical characteristic specifications do not apply when operating the device outside of its rated operating conditions. Note 2: The human body model is a 100 pF capacitor discharged through a 1.5 k Ω resistor into each pin. The machine model is a 200 pF capacitor discharged directly into each pin. www.national.com 3 |
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