LTC3115升压型转换器解析

LTC3115-1 是一款高电压、单片式、同步降压-升压型 DC/DC 转换器。该器件的 2.7V 至 40V 宽输入和输出电压范围使其非常适合于众多的汽车及 工业应用。一种专有的低噪声开关算法可在输入电压高于、低于、甚至等于输出电压的情况下优化效率，并确保操作模式之间的无缝转换。
　　可 编程频率 PWM 模式操作提供了低噪声和高效率运作，并能使开关操作同步至一个外部 时钟。该器件可支持高达 2MHz 的开关频率，以允许使用小值 电感器，从而实现应用电路的小型化。引脚可选的突发模式操作减小了待机电流并提高了轻负载效率，再加上一个 3μA 的停机电流，使得 LTC3115-1 成为电池 供电型应用的理想选择。这款器件的其他特点包括停机模式中的输出断接、短路保护和内部软起动功能。LTC3115-1 采用耐热性能增强型 16 引脚 4mm x 5mm x 0.75mm DFN 封装和 20 引脚 TSSOP 封装。
　　The LTC3115-1 is a high voltage monolith icsynchronous uck-boost DC/DC conver ter. Its wide 2.7V to 40V input and output voltage ranges make it well suited to a wide variety of automo tive and industrial applications.
　　A proprietary low noise switching alg orithm optimizes efficiency with input voltages that are above， below or even equal to the output voltage and ensures seamless transitions between operational modes. Prog rammable frequency PWM mode operation provides low noise， high efficiency operation and the ability to synchronize switching to an external clock.
　　Switching frequencies up to 2MHz are supported to allow use of small value inducto rsfor miniaturization of the application circuit. Pin selectable Burst Mode operation reduces standby current and improves light lo adefficiency which， combined with a 3μA shutdown current， make the LTC3115-1 ideally suited for battery-powered applications. Additional features include output disconnect in shutdown， short-circuit protection and internal soft-start. The LTC3115-1 is av ailable in thermally enhanced 16-lead 4mm × 5mm × 0.75mm DFN and 20lead TSSOP packages.
　　特性：
　　Wide VIN Range： 2.7V to 40V
　　Wide VOUT Range： 2.7V to 40V
　　1A Output Current for VIN ≥ 3.6V， VOUT = 5V
　　2A Output Current in Step-Down Operation for VIN ≥ 6V
　　Programmable Frequency： 100kHz to 2MHz
　　Synchronizable Up to 2MHz with an External Clock
　　Up to 95% Efficiency
　　30μA No-Load Quiescent Current in Burst Mode Operation
　　Ultralow Noise Buck-Boost PWM
　　Internal Soft-Start
　　3μA Supply Current in Shutdown
　　Programmable Input Undervoltage Lockout
　　Small 4mm × 5mm × 0.75mm DFN Package
　　Thermally Enhanced 20-Lead TSSOP Package
　　应用：
　　24V/28V Industrial Applications
　　Automotive Power Systems
　　Telecom， Servers and Networking Equipment
　　FireWire Regulator
　　Multiple Power Source Supplies