Electronic Components Datasheet Search
 ALLDATASHEET.COM Part #DescriptionMarking X

## RT8509 Datasheet(PDF) 8 Page - Richtek Technology Corporation

 Part # RT8509 Description 3A, 14V Step-Up DC/DC Converter Download 9 Pages Scroll/Zoom 100% Manufacturer RICHTEK [Richtek Technology Corporation] Direct Link http://www.richtek.com Logo

## RT8509 Datasheet(HTML) 8 Page - Richtek Technology Corporation

 8 / 9 pageRT85098DS8509-01 March 2012www.richtek.com©Copyright 2012 Richtek Technology Corporation. All rights reserved.is a registered trademark of Richtek Technology Corporation.Thermal ConsiderationsFor continuous operation, do not exceed absolutemaximum junction temperature. The maximum powerdissipation depends on the thermal resistance of the ICpackage, PCB layout, rate of surrounding airflow, anddifference between junction and ambient temperature. Themaximum power dissipation can be calculated by thefollowing formula :PD(MAX) = (TJ(MAX)− TA) / θJAwhere TJ(MAX) is the maximum junction temperature, TAisthe ambient temperature, andθJA is the junction to ambientthermal resistance.For recommended operating condition specifications, themaximum junction temperature is 125°C. The junction toambient thermal resistance,θJA, is layout dependent. ForWDFN-10L 3x3 packages, the thermal resistance,θJA, is70°C/W on a standard JEDEC 51-7 four-layer thermal testboard. The maximum power dissipation at TA = 25°C canbe calculated by the following formula :PD(MAX) = (125°C − 25°C) / (70°C/W) = 1.429W forWDFN-10L 3x3 packageThe maximum power dissipation depends on the operatingambient temperature for fixed TJ(MAX) and thermalresistance,θJA. The derating curve in Figure 2 allows thedesigner to see the effect of rising ambient temperatureon the maximum power dissipation.Figure 2. Derating Curve of Maximum Power DissipationLayout ConsiderationsFor high frequency switching power supplies, the PCBlayout is important to get good regulation, high efficiencyand stability. The following descriptions are the guidelinesfor better PCB layout.For good regulation, place the power components asclose as possible. The traces should be wide and shortenough especially for the high current output loop.The feedback voltage divider resistors must be near thefeedback pin. The divider center trace must be shorterand the trace must be kept away from any switchingnodes.The compensation circuit should be kept away from thepower loops and be shielded with a ground trace toprevent any noise coupling.Minimize the size of the LX node and keep it wide andshorter. Keep the LX node away from the FB.The exposed pad of the chip should be connected to astrong ground plane for maximum thermal consideration.Figure 3. PCB Layout GuideCOMPFBGNDGNDSSVINVSUPLXLXEN9871234510611R4C2VINGNDGNDVOUTCOUTL1CINVIND1R3C1GNDR1VOUTR2Place C2 as closeto VIN as possible.Place the power components asclose to the IC as possible. Thetraces should be wide and short,especially for the high-current loop.The compensation circuitshould be kept away from thepower loops and should beshielded with a ground trace toprevent any noise coupling.The feedback voltage-dividerresistors must be near thefeedback pin. The divider centertrace must be shorter and avoid thetrace near any switching nodes.0.00.20.40.60.81.01.21.41.60255075100125Ambient Temperature (°C)Four Layer PCB

## Similar Part No. - RT8509

 Manufacturer Part # Datasheet Description Astrodyne Corporation RT85 297Kb / 4P 85W Triple Output Switching Power Supply Richtek Technology Corp... RT8511B 134Kb / 11P 43V Asynchronous Boost WLED Driver Schaffner International... RT8522-10-6M0 2Mb / 6P Current-compensated Chokes RT8522-12-5M0 2Mb / 6P Current-compensated Chokes RT8522-16-4M0 2Mb / 6P Current-compensated Chokes
More results

## Similar Description - RT8509

 Manufacturer Part # Datasheet Description Shenzhen Huazhimei Semi... HM2204D 489Kb / 10P 14V Step-up DC/DC Converter Richtek Technology Corp... RTQ9297-QT 241Kb / 13P 3A High Performance Step-Up DC-DC Converter August 2021 Power Analog Micoelectr... PAM2421 210Kb / 9P 3A,4.5A,5.5A PWM Step-Up DC/DC Converter AiT Semiconductor Inc. A7542 456Kb / 9P DC-DC CONVERTER(BOOST) 1MHz, 3A STEP UP REGULATOR REV2.0 Unisonic Technologies UC8383 444Kb / 9P STEP-UP DC/DC CONVERTER Diodes Incorporated AP1603 159Kb / 8P STEP-UP DC/DC CONVERTER AP1603 Rev. 1 Anachip Corp AP1602 164Kb / 7P Step-Up DC/DC Converter AP1522 166Kb / 8P Step-Up DC/DC Converter Micon Design Technology... MDT7727 107Kb / 4P Step-up DC/DC Converter SiGe Semiconductor, Inc... AATIAN36 231Kb / 7P Step-Up DC/DC Converter
More results