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LM27951 Datasheet(PDF) 3 Page - National Semiconductor (TI) |
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LM27951 Datasheet(HTML) 3 Page - National Semiconductor (TI) |
3 / 10 page Absolute Maximum Ratings (Notes 1, 2) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. V IN -0.3V to 6.0V EN, PWM -0.3V to (V IN + 0.3V) w/ 6.0V max Continuous Power Dissipation (Note 3) Internally Limited Junction Temperature (T J-MAX-ABS) 150˚C Storage Temperature Range -65˚C to 150˚C Lead Temp. (Soldering, 5 sec.) 260˚C ESD Rating (Note 4) Human Body Model 2kV Operating Ratings (Notes 2, 7) Input Voltage V IN 3.0V to 5.5V LED Voltage Range 2.5V to 3.9V Junction Temperature Range (T J) -40˚C to +115˚C Ambient Temperature Range (T A) (Note 5) -40˚C to +85 ˚C Thermal Information Junction-to-Ambient Thermal Resistance, LLP-14 Package ( θ JA) (Note 6) 45˚C/W Electrical Characteristics (Notes 2, 7) Limits in standard typeface are for T A = 25˚C, and limits in boldface type apply over the full operating junction temperature range (-40˚C to +85 ˚C). Unless otherwise noted, specifications apply to the LM27951 Typical Application Circuit (pg.1) with V IN = 3.6V, V(EN) = 1.8V, V(PWM) = 1.8V, 4 LEDs, V DX = 3.6V, CIN =COUT = 3.3µF, C1 =C2 = 1µF, RSET = 12.5k Ω (Note 8) Symbol Parameter Conditions Min Typ Max Units I DX LED Current Regulation 3.0V ≤ V IN ≤ 5.5V R SET = 12.5k Ω I VOUT = 0mA 18.4 (−8%) 20 21.6 (+8%) mA 3.0V ≤ V IN ≤ 5.5V R SET = 8.32k Ω I VOUT = 0mA 30 3.0V ≤ V IN ≤ 5.5V R SET = 24.9k Ω I VOUT = 0mA 10 I D-MATCH LED Current Matching (Note 9) R SET = 8.32k Ω 0.2 1.5 % I Q Quiescent Supply Current D (1-4) = OPEN R SET = OPEN 1.5 1.9 mA I SD Shutdown Supply Current 3.0V ≤ V IN ≤ 5.5V V(EN) = 0V 0.1 1 µA V SET I SET Pin Voltage 3.0V ≤ V IN ≤ 5.5V 1.25 V I DX /ISET Output Current to Current Set Ratio 200 V HR Current Source Voltage Headroom Requirement (Note 10) I DX = 95% IDX (nom.) R SET = 8.32k Ω (I DX nom. = 30mA) 360 mV I DX = 95% IDX (nom.) R SET = 12.5k Ω (I DX nom. = 20mA) 240 f SW Switching Frequency 525 (-30%) 750 975 (+30%) kHz V IH Logic Input High Input Pins: EN, PWM 3.0V ≤ V IN ≤ 5.5V 1.0 V IN V V IL Logic Input Low Input Pins: EN, PWM 3.0V ≤ V IN ≤ 5.5V 0 0.4 www.national.com 3 |
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