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LM3508 Datasheet(PDF) 4 Page - Texas Instruments |
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LM3508 Datasheet(HTML) 4 Page - Texas Instruments |
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4 / 20 page  LM3508 SNVS494C – APRIL 2007 – REVISED MAY 2013 www.ti.com ELECTRICAL CHARACTERISTICS Specifications in standard type face are for TA = 25°C and those in boldface type apply over the Operating Temperature Range of TA = −30°C to +85°C. Unless otherwise specified VIN =3.6V. (1) Symbol Parameter Conditions Min Typ Max Units ID LED Current RSET = 10Ω 20 mA Regulation RSET = 6.67Ω 30 VSET Voltage at SET Pin 3.0V < VIN < 5.5V 190 200 210 mV VILED Voltage at ILED Pin 500 mV VHR Current Sink Where ILED = 95% of 400 mV Headroom Voltage nominal, RSET = 20Ω RDSON NMOS Switch On ISW = 100mA 0.5 Resistance Ω PMOS Switch On VOUT = 10V, ISW = 65mA 2.2 Resistance ICL NMOS Switch Current 370 500 620 mA Limit ILSW SW Leakage Current VSW = VIN = 5.5V, OUT 0.01 µA Floating, VEN = PGND IOUT_SHUTDOWN Outout Pull-Down VEN = 0V Resistance in 630 Ω Shutdown VOVP Output Over-Voltage ON Threshold (VOUT rising) 17.5 19.8 21.8 Protection V OFF Threshold (VOUT 18.6 falling) fSW Switching Frequency 3.0V < VIN < 5.5V 715 850 1150 kHz DMAX Maximum Duty Cycle 91 % VSC Output Voltage VOUT Falling 0.93×VIN Threshold for Short V VOUT Rising 0.95×VIN Circuit Detection VEN_TH EN Threshold Voltage On Threshold 1.1 Off Threshold 0.5 V VDIM_TH DIM Threshold On Threshold 1.1 V Voltage Off Threshold 0.5 IDIM DIM Bias Current(2) VDIM = 1.8V 4.7 µA IEN EN Bias Current(2) VEN = 1.8V 4.7 µA IOUT OUT Bias Current VOUT = 16V, device not 420 µA switching ROUT_SHUTDOWN Output Pull-Down VEN = 0V, VOUT < VIN Resistance in 630 Ω Shutdown IQ Quiescent Current VILED > 0.5V, 3.0V < VIN < 0.18 0.3 mA Device Not Switching 5.5V, SW Floating VEN = 0V, 3.0V < VIN < 0.01 0.5 5.5V IQ_SW Switching Supply 825 µA Current tSTART_UP From EN Low to High VOUT = 17V, ILED = 20mA to Inductor Current 470 µs Steady State (1) Min and Max limits are specified by design, test, or statistical analysis. Typical numbers are not specified, but do represent the most likely norm. Unless otherwise specified, conditions for typical specifications are VIN = 3.6V, TA = +25°C. (2) There is a typical 383k Ω pull-down on this pin. 4 Submit Documentation Feedback Copyright © 2007–2013, Texas Instruments Incorporated Product Folder Links: LM3508 |
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