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LM2621 Datasheet(PDF) 3 Page - National Semiconductor (TI) |
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LM2621 Datasheet(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. SW Pin Voltage −0.5 V to 14.5V BOOT, V DD, EN and FB Pins −0.5V to 10V FREQ Pin 100µA θ JA (Note 2) 240˚C/W T Jmax (Note 2) 150˚C Storage Temperature Range −65˚C to +150˚C Lead Temp. (Soldering, 5 sec) 260˚C Power Dissipation (T A=25˚C) (Note 2) 500mW ESD Rating (Note 3) 2kV Operating Conditions (Note 1) V DD Pin 2.5V to 5V FB, EN Pins 0 to V DD BOOT Pin 0 to 10V Ambient Temperature (T A) −40˚C to +85˚C Electrical Characteristics Limits in standard typeface are for T J = 25˚C, and limits in boldface type apply over the full operating temperature range of −40˚C to +85˚C. Unless otherwise specified: V DD=VOUT= 3.3V. Symbol Parameter Condition Typ Min Max Units V IN_ST Minimum Start-Up Supply Voltage (Note 4) I LOAD = 0mA 1.1 1.2 V V IN_OP Minimum Operating Supply Voltage (once started) I LOAD = 0mA 0.65 V V FB FB Pin Voltage 1.24 1.2028 1.2772 V V OUT_MAX Maximum Output Voltage 14 V V HYST Hysteresis Voltage (Note 7) 30 45 mV η Efficiency V IN = 3.6V; VOUT = 5V; ILOAD = 500mA 87 % V IN = 2.5V; VOUT = 3.3V; ILOAD = 200mA 87 D Switch Duty Cycle 70 60 80 % I DD Operating Quiescent Current (Note 6) FB Pin > 1.3V; EN Pin at V DD 80 110 µA I SD Shutdown Quiescent Current (Note 7) V DD, BOOT and SW Pins at 5.0V; EN Pin <200mV 0.01 2.5 µA I CL Switch Peak Current Limit 2.85 A R DS_ON MOSFET Switch On Resistance 0.17 Ω Enable Section V EN_LO EN Pin Voltage Low (Note 8) 0.15V DD V V EN_HI EN Pin Voltage High (Note 8) 0.7V DD V Note 1: Absolute maximum ratings indicate limits beyond which damage to the device may occur. Electrical specifications do not apply when operating the device outside of its rated operating conditions. Note 2: The maximum power dissipation must be derated at elevated temperatures and is dictated by Tjmax (maximum junction temperature), θJA (junction to ambient thermal resistance), and TA (ambient temperature). The maximum allowable power dissipation at any temperature is Pdmax =(Tjmax -TA)/ θJA or the number given in the Absolute Maximum Ratings, whichever is lower. Note 3: The human body model is a 100 pF capacitor discharged through a 1.5 k Ω resistor into each pin. For Pin 8 (SW) the ESD rating is 1.5 kV. Note 4: Output in regulation, VOUT =VOUT (NOMINAL) ± 5% Note 5: This is the hysteresis value of the internal comparator used for the gated-oscillator control scheme. Note 6: This is the current into the VDD pin. Note 7: This is the total current into pins VDD, BOOT, SW and FREQ. Note 8: When the EN pin is below VEN_LO, the regulator is shut down; when it is above VEN_HI, the regulator is operating. www.national.com 3 |
Número de pieza similar - LM2621_05 |
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Descripción similar - LM2621_05 |
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