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LP8552 Datasheet(PDF) 6 Page - Texas Instruments |
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LP8552 Datasheet(HTML) 6 Page - Texas Instruments |
6 / 49 page LP8552 SNVS693E – SEPTEMBER 2011 – REVISED SEPTEMBER 2014 www.ti.com 7.4 Thermal Information DSBGA THERMAL METRIC(1) UNIT 25 PINS RθJA Junction-to-ambient thermal resistance (2) 40 - 73 °C/W (1) For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report, SPRA953. (2) Junction-to-ambient thermal resistance is highly application and board-layout dependent. In applications where high maximum power dissipation exists, special care must be paid to thermal dissipation issues in board design. 7.5 Electrical Characteristics (1) (2) Limits are for TA = 25°C (unless otherwise specified); VIN = 12 V, VDDIO = 2.8 V, CVLDO = 1 μF, L1 = 15 μH, CIN = 10 μF, COUT = 10 μF. RISET = 16 kΩ, unless otherwise specified. (3) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT Internal LDO disabled 1 (4) μA Standby supply current EN=L and PWM=L LDO enabled, boost enabled, no current going through LED outputs 3 IIN 5-MHz PLL Clock Normal mode supply current mA 10-MHz PLL Clock 3.7 20-MHz PLL Clock 4.7 40-MHz PLL Clock 6.7 fOSC Internal oscillator frequency –4% 4% accuracy –7% (4) 7%(4) VLDO Internal LDO voltage 4.5 (4) 5 5.5 (4) V ILDO Internal LDO external loading 5 mA (1) All voltages are with respect to the potential at the GND pins. (2) Minimum (MIN) and Maximum (MAX) limits are specified by design, test, or statistical analysis. Typical numbers represent the most likely norm. (3) Low-ESR Surface-Mount Ceramic Capacitors (MLCCs) used in setting electrical characteristics. (4) Limits apply over the full operating ambient temperature range (–30°C ≤ TA ≤ 85°C). 7.6 Boost Converter Electrical Characteristics Limits are for TA = 25°C (unless otherwise specified); VIN = 12 V, VDDIO = 2.8 V, CVLDO = 1 μF, L1 = 15 μH, CIN = 10 μF, COUT = 10 μF. RISET = 16 kΩ, unless otherwise specified. (1) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT RDSON Switch ON resistance ISW = 0.5 A 0.12 Ω VMAX Boost maximum output voltage 40 V 9 V ≤ VBATT, VOUT = 35 V 450 ILOAD Maximum continuous load current 6 V ≤ VBATT, VOUT = 35 V 300 mA 3 V ≤ VBATT, VOUT = 25 V 180 VOUT/VIN Conversion ratio fSW = 1.25 MHz 10 BOOST_FREQ = 00 156 BOOST_FREQ = 01 312 fSW Switching frequency kHz BOOST_FREQ = 10 625 BOOST_FREQ = 11 1250 VOV Overvoltage protection voltage VBOOST + 1.6V V tPULSE Switch pulse minimum width no load 50 ns tSTARTUP Start-up time Note (2) 6 ms BOOST_IMAX = 0 1.4 IMAX SW pin current limit A BOOST_IMAX = 1 2.5 (1) Low-ESR Surface-Mount Ceramic Capacitors (MLCCs) used in setting electrical characteristics. (2) Start-up time is measured from the moment boost is activated until the VOUT crosses 90% of its target value. 6 Submit Documentation Feedback Copyright © 2011–2014, Texas Instruments Incorporated Product Folder Links: LP8552 |
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