Semtech SC493 带I2C接口降压电源控制方案
Semtech 公司的SC493是 带I2C接口的同步EcoSpeedTM降压电源控制器,它集成了I2C接口和自举开关,输入电压3V-28V,输出电压3.0V-5.5V,可以采用全陶瓷电容. SC493主要用在打印机和计算机外设.本文介绍了SC493主要特性,方框图和典型应用电路.
SC493 EcoSpeedTM Step-down Controller with I2C Interface
The SC493 is a synchronous EcoSpeedTM buck power supply controller. It features an I2C interface and a bootstrap switch in a space-saving MLPQ 3X3-20 pin package. The SC493 uses Semtech’s advanced patented adaptive on-time control architecture to provide excellent light load efficiency and fast transient response with small external components.
The I2C interface is used to program the output voltage offset, the power-on delay time, the soft-start time, the power save operating mode, and it can enable/disable the controller. Additionally, a status register provides information on device state and faults.
The controller is capable of operating with all ceramic solutions and switching frequencies up to 1MHz. The programmable frequency and selectable power save mode offer the
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