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LM3280 Datasheet(PDF) 5 Page - Texas Instruments |
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LM3280 Datasheet(HTML) 5 Page - Texas Instruments |
5 / 27 page LM3280 www.ti.com SNOSAU4B – OCTOBER 2006 – REVISED FEBRUARY 2013 Buck Electrical Characteristics (1)(2)(3) (continued) Limits in standard typeface are for TA = TJ = 25°C. Limits in boldface type apply over the full operating ambient temperature range ( −30°C ≤ TA = TJ ≤ +85°C). Unless otherwise noted, specifications apply to the LM3280 with: VIN = ( SVIN = PVIN = ) 3.6V, ENBUCK = 3.6V, ENLDO1 = ENLDO2 = ENLDO3 = BYP = 0V, FB = 2V, VCON = 0.267V. Symbol Parameter Conditions Min. Typ. Max Units ILIM-PWM Switch Current Limit FB = 0V (6) 700 820 940 mA ILIM-BYP Bypass FET Current Limit (7) 800 1000 1200 mA FOSC Internal Oscillator Frequency 1.8 2 2.2 MHz Gain VCON to VOUT Gain 0.267V ≤ VCON ≤ 1.20V, 3 V/V VIN = 4.2V ICON VCON Input Leakage Current VCON = 1.2V 10 nA (6) Electrical Characteristic table reflects open loop data (FB = 0V and current drawn from SW pin ramped up until cycle by cycle current limit is activated). Refer to datasheet curves for closed loop data and its variation with regards to supply voltage and temperature. Closed loop current limit is the peak inductor current measured in the application circuit by increasing output current until output voltage drops by 10%. (7) The current is defined as the load current at which the BYPOUT voltage is 1V lower than PVIN. Buck System Characteristics (1) (2) The following spec table entries are guaranteed by design if the component values in the typical application circuit are used. These parameters are not guaranteed by production testing. Symbol Parameter Conditions Min Typ Max Units TRESPONSE Time for VOUT to Rise from VIN = 4.2V, COUT = 4.7µF, 0.8V to 3.4V in PWM Mode RLOAD = 15Ω 25 µs L = 2.2 µH (ISAT > 0.94A) TSTARTUP Time for VOUT to rise to 3.4V VIN = 4.2V, COUT = 4.7µF, in PWM Mode RLOAD = 15Ω 36 µs (3) L = 2.2µH (ISAT = 0.94A) EN = Low to High CCON VCON Input Capacitance VIN = 3.6V, VCON = 1V, 15 pF Test Freq. = 100kHz TON_BYP Bypass FET Turn On Time In VIN = 3.6V, VCON = 0.267V, Bypass Mode COUT = 4.7µF, RLOAD = 15Ω 30 µs BYP = Low to High TBYP Auto Bypass Detect Delay (4) 10 15 20 µs Time (1) All voltages are with respect to the potential at the GND pins. (2) Shutdown current includes leakage current of PFET and Bypass FET. (3) The startup time is the time to reach 90% of 3.4V nominal output voltage from the ENBUCK being low to high. (4) SVIN is compared to the programmed output voltage (VOUT). When SVIN – VOUT falls below VBYPASS− for longer than TBYP the Bypass FET turns on and the switching FETs turn off. This is called the Bypass mode. The device comes out of Bypass mode when SVIN – VOUT exceeds VBYPASS + for longer than T BYP, and PWM mode returns. The hysteresis for the bypass detection threshold VBYPASS + – VBYPASS− will always be positive and will be approximately 200mV (typ.). LDO1, 2, and 3 Electrical Characteristics (1) (2) Limits in standard typeface are for TA = TJ = 25°C. Limits in boldface type apply over the full operating ambient temperature range ( −30°C ≤ TA = TJ ≤ +85°C). Unless otherwise noted, specifications apply to the LM3280 with: VIN = 3.6V, ENBUCK = 3.6V, BYP = 0V, FB = 2V, VCON = 0.267V, ENLDOx = 3.6V (3). Symbol Parameter Conditions Min Typ Max Units VLDO LDO Output Voltage VLDO = 2.85V, IOUT = 1mA -1 +1 % Accuracy -2 +2 % ΔVLDO Line Regulation VIN = VLDO(nom) + 0.5V to 5.5V, 0.1 %/V IOUT = 1mA Load Regulation IOUT = 1mA to 20mA 0.01 0.04 %/mA (1) All voltages are with respect to the potential at the GND pins. (2) Min and Max limits are guaranteed by design, test, or statistical analysis. Typical numbers are not guaranteed, but do represent the most likely norm. (3) The ENLDOx means that the one of ENLDO1, ENLDO2, and ENLDO3 is set high (> 1.2V) and the others are set 0V. Copyright © 2006–2013, Texas Instruments Incorporated Submit Documentation Feedback 5 Product Folder Links: LM3280 |
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