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Datenblatt-Suchmaschine für elektronische Bauteile |
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Datenblatt-Suchmaschine für elektronische Bauteile |
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LP55281 Datenblatt(PDF) 6 Page - Texas Instruments |
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LP55281 Datenblatt(HTML) 6 Page - Texas Instruments |
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6 / 35 page  LP55281 SNVS458B – JUNE 2007 – REVISED JUNE 2007 www.ti.com Electrical Characteristics (1) (2) Limits in standard typeface are for TJ = 25°C. Limits in boldface type apply over the operating ambient temperature range (- 30°C < TA < +85°C). Unless otherwise noted, specifications apply to the LP55281 Block Diagram with: VDD1 = VDD2 = 3.6V, VDDIO = 2.8V, CV DD = C VDDIO = 100 nF, COUT = CIN = 10 µF, CVDDA= 1 µF, CREF = 100 nF, L1 = 4.7 µH, RRGB = 8.2 kΩ and RRT = 82 k Ω (3). Symbol Parameter Condition Min Typ Max Units IDD Standby supply current (VDD1 + VDD2 + NSTBY = L 1 10 µA leakage to SW, FB, RGB1-4, ALED) SCK = SS = SI = H NRST = L No-Boost supply current (VDD1 + VDD2) NSTBY = H, EN_BOOST = L 350 µA SCK = SS = SI = H Audio synchronization and LEDs OFF No-load supply current (VDD1 + VDD2) NSTBY = H, EN_BOOST = H, SCK 0.6 mA = SS = SI = H Audio synchronization and LEDs OFF Autoload OFF Total RGB drivers quiescent current EN_RGBx = H 250 µA (VDD1 + VDD2) ALED driver current (VDD1 + VDD2) ALED[7:0] = FFh 180 µA ALED[7:0] = 00h 0 µA Audio Synchronization current (VDD1 + Audio Synchronization ON 390 µA VDD2) VDD1,2 = 2.8V 700 µA VDD1,2 = 3.6V IDDIO VDDIO Standby Supply current NSTBY = L 1 µA SCK = SS = SI = H VDDIO supply current 1 MHz SCK frequency in SPI mode, 20 µA CL = 50 pF at SO pin VDDA Output voltage of internal LDO for (4) -3% 2.80 +3% V analog parts MAGNETIC BOOST DC/DC CONVERTER ELECTRICAL CHARACTERISTICS Symbol Parameter Condition Min Typ Max Units ILOAD Recommended Load Current 3.0V ≤ VIN 0 300 mA VOUT = 5V 3.0V ≤ VIN 0 400 mA VOUT = 4V VOUT Output Voltage Accuracy (FB pin) 3.0V ≤ VIN ≤ VOUT - 0.5 -5 +5 % VOUT = 5V Output Voltage (FB pin) 1 mA ≤ ILOAD ≤ 300 mA VIN - V VIN > VOUT + VSCHOTTKY (5) Vschottky RDSON Switch ON resistance VDD1,2 = 3.0V, ISW = 0.5 A 0.4 0.8 Ω fBoost PWM mode switching frequency RT = 82 k Ω 2 MHz freq_sel[2:0] = 1XX Frequency Accuracy 2.7V ≤ VDDA ≤ 2.9V -7 ± 3 +7 % RT = 82 k Ω ± 1% -10 +10 tPULSE Switch pulse minimum width no load 30 ns t STARTUP Startup time Boost startup from STANDBY (6) 10 ms ISW_MAX SW pin current limit 700 800 900 mA 550 950 RGB DRIVER ELECTRICAL CHARACTERISTICS (R1-4, G1-4, B1-4) Symbol Parameter Condition Min Typ Max Units (1) All voltages are with respect to the potential at the GND pins. (2) Min and Max limits are guaranteed by design, test or statistical analysis. Typical numbers are not guaranteed, but do represent the most likely norm. (3) Low-ESR Surface-Mount Ceramic Capacitors (MLCCs) used in setting electrical characteristics. (4) VDDA output is not recommended for external use. (5) When VIN rises above VOUT + VSCHOTTKY, VOUT starts to follow the VIN voltage rise so that VOUT = VIN - VSCHOTTKY (6) Data guaranteed by design 6 Submit Documentation Feedback Copyright © 2007, Texas Instruments Incorporated Product Folder Links: LP55281 |
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