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LM3279 데이터시트(PDF) 6 Page - Texas Instruments |
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LM3279 데이터시트(HTML) 6 Page - Texas Instruments |
6 / 31 page LM3279 SNVS970A – MARCH 2013 – REVISED MAY 2013 www.ti.com ELECTRICAL CHARACTERISTICS (1) Limits in standard typeface are for TA = TJ = 25°C. Limits in boldface type apply over the full operating ambient temperature range ( −30°C ≤ TJ = TA ≤ +85°C). Unless otherwise noted, specifications apply to the LM3279 Typical Application Circuits with: PVIN = 3.8V, VIO or EN = 1.8V. Symbol Parameter Conditions Min Typ Max Units VSET = 0Bh 0.35 0.40 0.45 VFB,MIN Minimum FB voltage VCON = 0.167V 0.43 0.5 0.570 V VSET = 75h 4.122 4.212 4.302 VFB,MAX Maximum FB voltage VCON = 1.4V 4.11 4.2 4.29 IQ_PWM DC bias current in PVIN, SVIN No switching (2) FB = HIGH 1.4 2.0 mA VIO = EN = 0V, VCON = 0V, ISHDN Shutdown supply current 0.2 2.0 µA SW1 = SW2 = VOUT = 0V VIO = 1.8V, VSET_CTRL = 02h, IQ STBY Standby supply current 1.2 mA SW1 = SW2 = VOUT = 0V ILIM_L Input current limit (large) Open Loop (3) VCON = 1.2V 1500 1700 mA ILIM_S Input current limit (small) Open Loop (3) VCON = 0.2V 700 850 FOSC_PWM Internal oscillator frequency PWM 2.1 2.4 2.7 MHz fSCLK SCLK clock frequency 0.032 26 IVIO-IN VIO voltage average input current VIO = 1.8V, 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 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 = −2mA 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 = 0V 5 10 µA Gain Internal gain (4) 0.2V ≤ VCON ≤ 1.4V 3 V/V ICON VCON pin input leakage EN = 3.8V -1 +1 µA Leakage into VOUT pin of the buck- IOUT_LEAKAGE EN = 0, VOUT ≤ 4.2V, VBATT ≤ 5.5V 5 boost (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 = 3.8V. For performance over the input voltage range and closed loop results refer to the datasheet curves. (4) When using analog control (EN = HIGH) to calculate VOUT, use the following equation: VOUT = VCON × 3. 6 Submit Documentation Feedback Copyright © 2013, Texas Instruments Incorporated Product Folder Links: LM3279 |
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