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LTC3115同步降压-升压型转换器详细介绍
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 monolithic synchronous uck-boost DC/DC converter. Its wide 2.7V to 40V input and output voltage ranges make it well suited to a wide variety of automotive and industrial applications.
A proprietary low noise switching algorithm optimizes efficiency with input voltages that are above, below or even equal to the output voltage and ensures seamless transitions between operational modes. Programmable 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 inductors for miniaturization of the application circuit. Pin selectable Burst Mode operation reduces standby current and improves light load efficiency 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 available in thermally enhanced 16-lead 4mm × 5mm × 0.75mm DFN and 20 lead 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
应用
推荐阅读:
1.LTC3115同步降压-升压型转换器入门指南
摘 要:LTC3115-1 的2.7V至40V输入和输出范围提供了一个稳压输出,而输入可高于、低于或等于调节输出。LTC3115-1 中采用的低噪声降压-升压拓扑实现了降压和升压模式之间的连续无抖动转换,使其非常适合于RF和其他噪声敏感型的应用,这些应用必须在可变的输入电源中维 持低噪声恒定输出电压。高达95%的效率延长了电池供电系统的运行时间。用户可在 100kHz至 2MHz 之间设置 LTC3115-1 的开关频率,并可同步至外部时钟。专有的降压-升压 PWM 电路确保了低噪声和高效率,同时减小了外部元器件的尺寸。
2.LTC3115同步降压-升压型转换器应用笔记
摘 要: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。本文在讲解基础的同时,将LTC3155的工作过程进行了分析,方便读者在进行开发时参考。
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