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LM3208TLX Fiches technique(PDF) 4 Page - National Semiconductor (TI) |
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LM3208TLX Fiches technique(HTML) 4 Page - National Semiconductor (TI) |
4 / 17 page System Characteristics The following spec table entries are guaranteed by design providing the component values in the typical application circuit are used (L = 3.0µH, DCR = 0.12 Ω, FDK MIPW3226D3R0M; C IN = 10µF, 6.3V, 0805, TDK C2012X5R0J106K; C OUT = 4.7µF, 6.3V, 0603, TDK C1608X5R0J475M). These parameters are not guaranteed by production testing. Min and Max values are specified over the ambient temperature range T A = −30˚C to 85˚C. Typical val- ues are specified at PV IN =VDD = EN = 3.6V and TA = 25˚C unless otherwise specified. Symbol Parameter Conditions Min Typ Max Units T RESPONSE Time for V OUT to rise from 0.8V to 3.4V (to reach 3.35V) V IN = 4.2V, RLOAD = 5.5 Ω 25 40 µs Time for V OUT to fall from 3.4V to 0.8V V IN = 4.2V, RLOAD =15 Ω 35 45 µs C CON V CON input capacitance V CON = 1V, VIN=2.7V to 5.5V, Test frequency = 100kHz 510 pF C EN EN input capacitance EN = 2V, V IN= 2.7V to 5.5V, Test frequency = 100kHz 510 pF V CON (S>L) R DSON(P) management threshold Threshold for PFET R DSON(P) to change from 960m Ω to 140mΩ 0.39 0.42 0.45 V V CON (L>S) R DSON(P) management threshold Threshold for PFET R DSON(P) to change from 140m Ω to 960mΩ 0.37 0.40 0.43 V I OUT, MAX Maximum Output Current V IN = 2.7V to 5.5V, VCON = 0.45V to 1.44V, L = MIPW3226D3R0 650 mA V IN = 2.7V to 5.5V, VCON = 0.32V to 0.45V, L = MIPW3226D3R0 400 mA Linearity Linearity in control range 0.32V to 1.44V V IN = 3.9V (Note 14) Monotonic in nature −3 +3 % −50 +50 mV T ON Turn on time (time for output to reach 97% of final value after Enable low to high transition) EN = Low to High, V IN = 4.2V, VOUT = 3.4V, I OUT ≤ 1mA 40 60 µs η Efficiency V IN = 3.6V, VOUT = 0.8V, IOUT = 90mA 81 % V IN = 3.6V, VOUT = 1.5V, IOUT = 150mA 89 % V IN = 3.9V, VOUT = 3.4V, IOUT = 400mA 95 % V OUT_ripple Ripple voltage at no pulse skip condition V IN = 2.7V to 4.5V, VOUT = 0.8V to 3.4V, Differential voltage = V IN -VOUT > 1V, I OUT = 0mA to 400mA (Note 12) 10 mVp-p Ripple voltage at pulse skip condition V IN = 5.5V to dropout, VOUT = 3.4V, I OUT = 650mA (Note 12) 60 mVp-p Line_tr Line transient response V IN = 3.6V to 4.2V, T R =TF = 10µs, V OUT = 0.8V, IOUT = 100mA 50 mVpk Load_tr Load transient response V IN = 3.1/3.6/4.5V, VOUT = 0.8V, I OUT = 50mA to 150mA 50 mVpk Max Duty cycle Maximum duty cycle 100 % Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the component may occur. Operating Ratings are conditions under which operation of the device is guaranteed. Operating Ratings do not imply guaranteed performance limits. For guaranteed performance limits and associated test conditions, see the Electrical Characteristics tables. Note 2: All voltages are with respect to the potential at the GND pins. The LM3208 is designed for mobile phone applications where turn-on after power-up is controlled by the system controller and where requirements for a small package size overrule increased die size for internal Under Voltage Lock-Out (UVLO) circuitry. Thus, it should be kept in shutdown by holding the EN pin low until the input voltage exceeds 2.7V. Note 3: Internal thermal shutdown circuitry protects the device from permanent damage. Thermal shutdown engages at TJ = 150˚C (typ.) and disengages at TJ = 125˚C (typ.). Note 4: The Human body model is a 100pF capacitor discharged through a 1.5k Ω resistor into each pin. (MIL-STD-883 3015.7) The machine model is a 200pF capacitor discharged directly into each pin. Note 5: In applications where high power dissipation and/or poor package thermal resistance is present, the maximum ambient temperature may have to be de-rated. Maximum ambient temperature (TA-MAX) is dependent on the maximum operating junction temperature (TJ-MAX-OP = 125˚C), the maximum power dissipation of the device in the application (PD-MAX), and the junction-to ambient thermal resistance of the part/package in the application (θJA), as given by the following equation: TA-MAX =TJ-MAX-OP –(θJA xPD-MAX). www.national.com 4 |
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