LTC3115-1 是一款高電壓、單片式、同步降壓-升壓型 DC/DC 轉(zhuǎn)換器。該器件的 2.7V 至 40V 寬輸入和輸出電壓范圍使其非常適合于眾多的汽車(chē)及工業(yè)應(yīng)用。一種專(zhuān)有的低噪聲開(kāi)關(guān)算法可在輸入電壓高于、低于、甚至等于輸出電壓的情況下優(yōu)化效率，并確保操作模式之間的無(wú)縫轉(zhuǎn)換。

可編程頻率 PWM 模式操作提供了低噪聲和高效率運(yùn)作，并能使開(kāi)關(guān)操作同步至一個(gè)外部時(shí)鐘。該器件可支持高達(dá) 2MHz 的開(kāi)關(guān)頻率，以允許使用小值電感器，從而實(shí)現(xiàn)應(yīng)用電路的小型化。引腳可選的突發(fā)模式操作減小了待機(jī)電流并提高了輕負(fù)載效率，再加上一個(gè) 3μA 的停機(jī)電流，使得 LTC3115-1 成為電池供電型應(yīng)用的理想選擇。這款器件的其他特點(diǎn)包括停機(jī)模式中的輸出斷接、短路保護(hù)和內(nèi)部軟起動(dòng)功能。LTC3115-1 采用耐熱性能增強(qiáng)型 16 引腳 4mm x 5mm x 0.75mm DFN 封裝和 20 引腳 TSSOP 封裝。

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 40VWide VOUT Range: 2.7V to 40V1A Output Current for VIN ≥ 3.6V, VOUT = 5V2A Output Current in Step-Down Operation for VIN ≥ 6VProgrammable Frequency: 100kHz to 2MHzSynchronizable Up to 2MHz with an External ClockUp to 95% Efficiency30μA No-Load Quiescent Current in Burst Mode OperationUltralow Noise Buck-Boost PWMInternal Soft-Start3μA Supply Current in ShutdownProgrammable Input Undervoltage LockoutSmall 4mm × 5mm × 0.75mm DFN PackageThermally Enhanced 20-Lead TSSOP Package

應(yīng)用：

24V/28V Industrial Applications

Automotive Power Systems

Telecom, Servers and Networking Equipment

FireWire Regulator

Multiple Power Source Supplies

應(yīng)用

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摘 要：LTC3115-1 的2.7V至40V輸入和輸出范圍提供了一個(gè)穩(wěn)壓輸出，而輸入可高于、低于或等于調(diào)節(jié)輸出。LTC3115-1 中采用的低噪聲降壓-升壓拓?fù)鋵?shí)現(xiàn)了降壓和升壓模式之間的連續(xù)無(wú)抖動(dòng)轉(zhuǎn)換，使其非常適合于RF和其他噪聲敏感型的應(yīng)用，這些應(yīng)用必須在可變的輸入電源中維 持低噪聲恒定輸出電壓。高達(dá)95%的效率延長(zhǎng)了電池供電系統(tǒng)的運(yùn)行時(shí)間。用戶(hù)可在 100kHz至 2MHz 之間設(shè)置 LTC3115-1 的開(kāi)關(guān)頻率，并可同步至外部時(shí)鐘。專(zhuān)有的降壓-升壓 PWM 電路確保了低噪聲和高效率，同時(shí)減小了外部元器件的尺寸。

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