芯片封装结温计算方法.pdf

2010201120122013• • LMR10510LMR10510采用 SOT-23 和 LLP 封装的 SIMPLE SWITCHER ® 5.5V 输入电压、1A 降压稳压器文献编号：ZHCSA20ALMR10510October 31, 2011SIMPLE SWITCHER® 5.5Vin, 1A Step-Down Voltage Regulator in SOT-23 and LLPFeatures■Input voltage range of 3V to 5.5V ■Output voltage range of 0.6V to 4.5V ■Output current up to 1A ■1.6MHz (LMR10510X) and 3 MHz (LMR10510Y) switching frequencies ■Low shutdown Iq, 30 nA typical ■Internal soft-start ■Internally compensated ■Current-Mode PWM operation ■Thermal shutdown ■SOT23-5 (2.92 x 2.84 x 1 mm) and LLP-6 (3 x 3 x 0.8 mm) packaging ■Fully enabled for WEBENCH® Power DesignerPerformance Benefits■Extremely easy to use ■Tiny overall solution reduces system costApplications■Point-of-Load Conversions from 3.3V, and 5V Rails ■Space Constrained Applications ■Battery Powered Equipment ■Industrial Distributed Power Applications ■Power Meters ■Portable Hand-Held InstrumentsSystem PerformanceEfficiency vs Load Current - “X“ VIN = 5V0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0405060708090100EFFICIENCY (%)LOAD CURRENT (A)1.8Vout 3.3Vout30165696Efficiency vs Load Current - “Y“ VIN = 5V0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0405060708090100EFFICIENCY (%)LOAD CURRENT (A)1.8Vout 3.3Vout30165697Typical Application30165664© 2011 Texas Instruments ILMR10510 SIMPLE SWITCHER® 5.5Vin, 1A Step-Down Voltage Regulator in SOT-23 and LLP2011 年 10 月 31 日采用 SOT-23 和 LLP 封装的 SIMPLE SWITCHER® 5.5 V 输入电 压、1 A 降压稳压器LMR10510 采用 SOT-23 和 LLP 封装的 SIMPLE SWITCHER® 5.5 V 输入电压、1 A 降压稳压器LMR10510特性• 输入电压范围：3 V至 5.5 V • 输出电压范围：0.6 V 至 4.5 V • 输出电流高达 1 A • 1.6 MHz (LMR10510X) 和 3 MHz (LMR10510Y) 开关频率 • 低停机静态电流 (Iq)：30 nA（典型值） • 内部软起动 • 内部补偿 • 电流模式脉宽调制 (PWM) 操作 • 具有热关断功能 • SOT23-5 (2.92 x 2.84 x 1 mm) 和 LLP-6 (3 x 3 x 0.8 mm) 封装 • 得到 WEBENCH® Power Designer 工具的全面支持系统性能典型应用性能优势• 易用性极佳 • 纤巧的总体解决方案降低了系统成本应用• 从 3.3 V 和 5 V 电源轨的负载点转换 • 空间受限型应用 • 电池供电型设备 • 工业分布式电源应用 • 功率表 • 便携手持式仪器效率与负载电流的关系曲线 －“X” VIN = 5 V效率与负载电流的关系曲线 －“Y” VIN = 5 VConnection Diagrams30165601 6-Pin LLP30165603 5-Pin SOT-23Ordering InformationOrder NumberFrequency OptionPackage TypeNSC Package DrawingTop MarkSupplied AsLMR10510XMFE1.6MHzSOT23-5MF05ASH7B250 units Tape and ReelLMR10510XMF1000 units Tape and ReelLMR10510XMFX3000 units Tape and ReelLMR10510YMFE3MHzSH9B250 units Tape and ReelLMR10510YMF1000 units Tape and ReelLMR10510YMFX3000 units Tape and ReelLMR10510YSDELLP-6SDE06AL268B250 units Tape and ReelLMR10510YSD1000 units Tape and ReelLMR10510YSDX4500 units Tape and R2LMR105105 引脚 SOT-23 封装6 引脚 LLP 封装订购编号频率选项封装类型NSC 封装图例正面标记装运方式LMR10510XMFE1.6 MHzSOT23-5MF05ASH7B250，带装和卷装 LMR10510XMF1000，带装和卷装LMR10510XMFX3000，带装和卷装LMR10510YMFE3 MHzSH9B250，带装和卷装 LMR10510YMF1000，带装和卷装LMR10510YMFX3000，带装和卷装LMR10510YSDELLP-6SDE06AL268B250，带装和卷装 LMR10510YSD1000，带装和卷装LMR10510YSDX4500，带装和卷装连线图订购信息Pin Descriptions 5-Pin SOT23PinNameFunction1SWSwitch node. Connect to the inductor and catch diode.2GNDSignal and power ground pin. Place the bottom resistor of the feedback network as close as possible to this pin.3FBFeedback pin. Connect to external resistor divider to set output voltage.4ENEnable control input. Logic high enables operation. Do not allow this pin to float or be greater than VIN + 0.3V.5VINInput supply voltage.Pin Descriptions 6-Pin LLPPinNameFunction1FBFeedback pin. Connect to external resistor divider to set output voltage.2GNDSignal and power ground pin. Place the bottom resistor of the feedback network as close as possible to this pin.3SWSwitch node. Connect to the inductor and catch diode.4VINDPower Input supply.5VINAControl circuitry supply voltage. Connect VINA to VIND on PC board.6ENEnable control input. Logic high enables operation. Do not allow this pin to float or be greater than VINA + 0.3V.DAPDie Attach PadConnect to system ground for low thermal impedance, but it cannot be used as a primary GND LMR105105 引脚 SOT23 封装的引脚说明引脚名称功能1SW开关节点。

连接至电感器和箝位二极管2GND信号和电源接地引脚将反馈网络的底端电阻器布设在尽可能靠近该引脚的地方3FB反馈引脚连接至外部电阻分压器，以设定输出电压4EN使能控制输入当该引脚为逻辑高电平时，将使能器件操作不得允许此引脚浮置或高于 VIN + 0.3 V5VIN输入电源电压6 引脚 LLP 封装的引脚说明引脚名称功能1FB反馈引脚连接至外部电阻分压器，以设定输出电压2GND信号和电源接地引脚将反馈网络的底端电阻器布设在尽可能靠近该引脚的地方3SW开关节点连接至电感器和箝位二极管4VIND输入电源5VINA控制电路电源电压在 PC 板上将 VINA 连接至 VIND6EN使能控制输入当该引脚为逻辑高电平时，将使能器件操作不得允许此引脚浮置或高于 VINA + 0.3 V DAP芯片粘接焊盘连接至系统地以实现低的热阻抗，但它不可被用作一个主 GND 连接Absolute Maximum Ratings (Note 1)If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/ Distributors for availability and specifications.VIN-0.5V to 7V FB Voltage-0.5V to 3V EN Voltage-0.5V to 7V SW Voltage-0.5V to 7V ESD Susceptibility2kVJunction Temperature (Note 2)150°C Storage Temperature−65°C to +150°C For soldering specifications: see product folder at and RatingsVIN3V to 5.5V Junction Temperature−40°C to +125°CElectrical Characteristics (Note 3), (Note 4)VIN = 5V unless otherwi。