HL7546 0.8A Synchronous Step-Down Converter

2025-10-02 Halo Microelectronics
HL7546是一款专为便携式应用的不同子系统供电的同步降压转换器。其输入电压范围为2.5V至5.5V。HL7546可提供高达0.8A的电流,同时在负载电流低至1mA时仍能保持超过92%的效率。它以1.5MHz的高频率运行,这大大降低了外部组件的值。可以使用广泛范围的输出电容器来优化负载瞬态期间的VOUT稳定性。在不影响环路稳定性的情况下,可以使用2.2μH的电感器。在中等至轻负载下,使用脉冲频率调制(PFM)来维持转换效率,具有典型的非开关静态电流为2.6uA。即使在如此低的静态电流下,HL7546也能保持出色的负载和线路瞬态响应。PFM模式可能会引入噪声,HL7546可以配置为OOA(音频外)模式,其中最小开关频率为25kHz。在更高的负载下,系统自动切换到固定频率的脉冲宽度调制(PWM)操作,以实现最小的VOUT纹波和最佳负载瞬态响应。在关断模式下,供电电流降至1uA以下,从而降低功耗。HL7546采用1.54mm x 0.77mm WLCSP-8封装。
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