Semtech SC174输出4A降压稳压方案

Semtech 公司的SC174是 4A降压稳压器,它采用Semtech先进的专利架构,在点负载(POL)应用时有最好的动态范围.输入电压从3V到5.5V,输出电压从0.75V 到 95% x VIN可编程,输出电流高达4A,峰值效率高达95%,具有短路,过压和欠压以及超温保护,内部有软起动和超级降功耗,主要用在网络设备,嵌入系统,医疗设备,办公自动化,仪表和手提设备,消费类电子和5V POL转换器.本文介绍了SC174主要特性,方框图,多种典型应用电路以及PCB布局图.

The SC174 is an integrated, synchronous 4A EcoSpeedTM step-down regulator, which incorporates Semtech’s advanced, patented adaptive on-time architecture to achieve best-in-class performance in dynamic point-of load applications. The input voltage range is 3V to 5.5V with a programmable output voltage from 0.75V up to 95% x VIN. The device features low-RDS(ON) internal switches and optional PSAVE mode for high efficiency across the output load range.

Adaptive on-time control provides programmable pseudo- fixed frequency operation and excellent transient performance. The switching frequency can be set from 200kHz to 1MHz - allowing the designer to reduce external LC filtering and minimize light load (standby) losses. Disabling PSAVE operation reduces output voltage ripple at light load for ceramic output capacitors.
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