TI TPS5429x全集成双路降压电源转换方案

TI 公司的TPS54290/1/2是全集成双路输出全同步降压电源转换器,通路1提供高达1.5A连续电流, 通路2提供高达2.5A连续电流.输入电压从4.5V到18V,输出电压低到0.8V,高到输入电压的90%,主要应用在STB,DTV,DSP电源和消费类电子.本文介绍TPS54290/1/2主要特性,方框图,两种设计案例电路和材料列表,以及TPS54291EVM-431评估板电路图和材料清单(BOM).

TPS54290/1/2 is a dual output fully synchronous buck converter capable of supporting applications with a minimal number of external components. It operates from a 4.5 V to 18 V input supply voltage, and supports output voltages as low as 0.8 V and as high as 90% of the input voltage.

Both high-side and low-side MOSFETs are integrated to provide fully synchronous conversion with higher efficiency. Channel1 can provide up to 1.5 A of continuous current, meanwhile, Channel2 supports up to 2.5 A.

Current mode control simplifies the compensation. The external compensation adds flexibility for the user to choose different type of output capacitors.

180°out-of-phase operation reduces the ripple current through the input capacitor, providing the benefit of reducing input capacitance, alleviating EMI and increasing capacitor life.

TPS5429x 主要特性:

4.5 V to 18 V Input Range

Output Voltage Range 0.8 V to DMAX × VIN
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