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LM3279 Datasheet(PDF) 5 Page - Texas Instruments |
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LM3279 Datasheet(HTML) 5 Page - Texas Instruments |
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5 / 37 page  LM3279 www.ti.com SNVS970C – MARCH 2013 – REVISED OCTOBER 2014 6.4 Thermal Information DSBGA THERMAL METRIC(1) YZR UNIT 16 PINS RθJA Junction-to-ambient thermal resistance 70.1 RθJC(top) Junction-to-case (top) thermal resistance 14.4 RθJB Junction-to-board thermal resistance 10 °C/W ψJT Junction-to-top characterization parameter 1.7 ψJB Junction-to-board characterization parameter 10 RθJC(bot) Junction-to-case (bottom) thermal resistance N/A (1) For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report, SPRA953. 6.5 Electrical Characteristics (1) Limits are for TA = TJ = 25°C, and specifications apply to the LM3279 Typical Application Circuits with: PVIN = 3.8 V, VIO or EN = 1.8 V, unless otherwise specified. PARAMETER TEST CONDITIONS MIN TYP MAX UNIT VSET = 0Bh 0.35 0.40 0.45 VFB,MIN Minimum FB voltage VCON = 0.167 V 0.43 0.5 0.570 V VSET = 75h 4.122 4.212 4.302 VFB,MAX Maximum FB voltage VCON = 1.4 V 4.11 4.2 4.29 No switching (2) FB = HIGH IQ_PWM DC bias current in PVIN, SVIN 1.4 2 mA Max limits = −30°C ≤ TJ = TA ≤ 85°C VIO = EN = 0 V, VCON = 0 V, ISHDN Shutdown supply current SW1 = SW2 = VOUT = 0 V 0.2 2 µA Max limits = −30°C ≤ TJ = TA ≤ 85°C VIO = 1.8 V, VSET_CTRL = 02h, IQ STBY Standby supply current 1.2 mA SW1 = SW2 = VOUT = 0 V ILIM_L Input current limit (large) Open Loop (3) VCON = 1.2 V 1500 1700 mA ILIM_S Input current limit (small) Open Loop (3) VCON = 0.2 V 700 850 PWM ƒOSC_PWM Internal oscillator frequency 2.1 2.4 2.7 Min and Max limits = −30°C ≤ TJ = TA ≤ 85°C MHz fSCLK SCLK clock frequency 0.032 26 IVIO-IN VIO voltage average input current VIO = 1.8 V, Average during 26-MHz write 1.25 mA ISDATA −2 1 IIL VIN = 0.2*VIO ISCLK −1 1 µA ISDATA −2 10 IIH VIN = 0.8*VIO ISCLK −1 10 Input high-level threshold EN, GPO0, VIH 1.2 GPO1 Min and Max limits = −30°C ≤ TJ = TA ≤ 85°C V Input low-level threshold EN, GPO0, VIL 0.6 GPO1 VIH-SDATA, Input high-level threshold SDATA, 0.4*VIO 0.7*VIO SCLK SCLK VIL-SDATA, Input low-level threshold SDATA, 0.3*VIO 0.6*VIO SCLK SCLK V VOH-SDATA Output high-level threshold SDATA ISDATA = −2 mA 0.8*VIO VIO + 0.01 VOL-SDATA Output low-level threshold SDATA ISDATA = 2 mA 0.2*VIO VOH-GPO Output high-level threshold GPO IOUT = ±200 µA VIO −0.15V VIO+0.1V VOL-GPO Output low-level threshold GPO IOUT = ±200 µA −0.4 0.3 V VSET-LSB Output voltage LSB VSET_CTRL = 40h to 41h 36 mV IEN EN pin pulldown current VIO = 0 V 5 10 µA (1) Min and Max limits are specified by design, test, or statistical analysis. (2) IQ specified here is when the part is not switching. (3) The parameters in the electrical characteristics table are tested under open loop conditions at PVIN = 3.8 V. For performance over the input voltage range and closed loop results refer to the datasheet curves. Copyright © 2013–2014, Texas Instruments Incorporated Submit Documentation Feedback 5 Product Folder Links: LM3279 |
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