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LP8545 数据表(PDF) 6 Page - Texas Instruments |
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LP8545 数据表(HTML) 6 Page - Texas Instruments |
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6 / 44 page  LP8545 SNVS635D – APRIL 2010 – REVISED DECEMBER 2013 www.ti.com ELECTRICAL CHARACTERISTICS (1) (2) Limits in standard typeface are for TA = 25°C. Limits in boldface type apply over the full operating ambient temperature range (-30°C ≤ TA ≤ +85°C). Unless otherwise specified: VIN = 12.0V, CVLDO = 1 μF, L1 = 15 μH, CIN = 10 μF, COUT = 10 μF. RISET = 16 k Ω. (3) Symbol Parameter Condition Min Typ Max Units Standby Supply Current Internal LDO disabled 1 μA EN=L and PWM=L LDO enabled, boost enabled, no current going through LED outputs, Internal FET 4.0 used IIN 5 MHz PLL Clock Normal Mode Supply Current mA 10 MHz PLL Clock 4.8 20 MHz PLL Clock 6.0 40 MHz PLL Clock 8.4 fOSC Internal Oscillator Frequency -4 +4 % Accuracy -7 +7 VLDO Internal LDO Voltage 4.5 5.0 5.5 V ILDO Internal LDO External Loading 5.0 mA (1) All voltages are with respect to the potential at the GND pins. (2) Min and Max limits are ensured by design, test, or statistical analysis. Typical numbers are not ensured, but do represent the most likely norm. (3) Low-ESR Surface-Mount Ceramic Capacitors (MLCCs) used in setting electrical characteristics. BOOST CONVERTER ELECTRICAL CHARACTERISTICS Symbol Parameter Condition Min Typ Max Units RDSON Switch ON Resistance ISW = 0.5A 0.12 Ω VMAX Boost Maximum Output Voltage 40 V 9.0V ≤ VBATT, VOUT = 35V 450 Maximum Continuous Load ILOAD 6.0V ≤ VBATT, VOUT = 35V 300 mA Current, Internal FET 3.0V ≤ VBATT, VOUT = 25V 180 9.0V ≤ VBATT, VOUT = 50V 320 Maximum Continuous Load ILOAD mA Current, External FET 6.0V ≤ VBATT, VOUT = 50V 190 VOUT/VIN Conversion Ratio 10 BOOST_FREQ = 00 156 BOOST_FREQ = 01 312 fSW Switching Frequency kHz BOOST_FREQ = 10 625 BOOST_FREQ = 11 1250 VBOOST ≥ 38V VBOOST + 1.6V VOV Over-voltage Protection Voltage V VBOOST < 38V VBOOST + 4V tPULSE Switch Pulse Minimum Width no load 50 ns tSTARTUP Startup Time (1) 6 ms BOOST_IMAX[1:0] = 00 0.9 BOOST_IMAX[1:0] = 01 1.4 IMAX SW Pin Current Limit A BOOST_IMAX[1:0] = 10 2.0 BOOST_IMAX[1:0] = 11 2.5 VGD Gate Driver Pin Voltage EN_EXT_FET = 1 0 VLDO V (1) Startup time is measured from the moment boost is activated until the VOUT crosses 90% of its target value. 6 Submit Documentation Feedback Copyright © 2010–2013, Texas Instruments Incorporated Product Folder Links: LP8545 |
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