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LM3205 Datasheet(PDF) 4 Page - Texas Instruments |
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LM3205 Datasheet(HTML) 4 Page - Texas Instruments |
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4 / 28 page  LM3205 SNVS388E – JULY 2005 – REVISED APRIL 2013 www.ti.com ELECTRICAL CHARACTERISTICS (1) (2) (3) 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, all specifications apply to LM3205TL/LM3205SD with: PVIN = VDD = EN = 3.6V. Symbol Parameter Conditions Min Typ Max Units VFB, MIN Feedback Voltage at VCON = 0.32V (3) 0.75 0.8 0.85 V minimum setting VFB, MAX Feedback Voltage at VCON = 1.44V, VIN = 4.2V (3) 3.537 3.6 3.683 V maximum setting ISHDN Shutdown supply current EN = SW = VCON = 0V (4) 0.01 2 µA IQ DC bias current into VDD VCON = 2V, FB = 0V, No Switching (5) 1 1.4 mA RDSON(P) DSBGA Pin-pin resistance for PFET ISW = 200mA 200 140 m Ω 230 RDSON(N) DSBGA Pin-pin resistance for NFET ISW = -200mA 415 300 m Ω 485 RDSON(P)WSON Pin-pin resistance for PFET ISW = 200mA 230 170 m Ω 260 RDSON(N)WSON Pin-pin resistance for NFET ISW = -200mA 445 330 m Ω 515 ILIM,PFET Switch peak current limit See(6) 935 1100 1200 mA FOSC Internal oscillator frequency 1.7 2 2.3 MHz VIH,EN Logic high input threshold 1.2 V VIL,EN Logic low input threshold 0.5 V IPIN,EN Pin pull down current 5 10 µA ZCON VCON input resistance 100 k Ω Gain VCON to VOUT Gain 0.32V ≤ VCON ≤ 1.44V 2.5 V/V (1) All voltages are with respect to the potential at the GND pins. The LM3205 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. (2) Min and Max limits are specified by design, test, or statistical analysis. Typical numbers are not ensured, but do represent the most likely norm. Due to the pulsed nature of the testing TA = TJ for the electrical characteristics table. (3) The parameters in the electrical characteristics table are tested under open loop conditions at PVIN = VDD = 3.6V. For performance over the input voltage range and closed loop results refer to the datasheet curves. (4) Shutdown current includes leakage current of PFET. (5) IQ specified here is when the part is operating at 100% duty cycle. (6) Current limit is built-in, fixed, and not adjustable. Refer to datasheet curves for closed loop data and its variation with regards to supply voltage and temperature. Electrical Characteristic table reflects open loop data (FB = 0V and current drawn from SW pin ramped up until cycle by cycle limit is activated). Closed loop current limit is the peak inductor current measured in the application circuit by increasing output current until output voltage drops by 10%. 4 Submit Documentation Feedback Copyright © 2005–2013, Texas Instruments Incorporated Product Folder Links: LM3205 |
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