Description

The SC1101 is a versatile, low-cost, voltage-mode PWM controller designed for low output voltage DC/DC power supply applications. A simple, fixed-voltage buck regulator can be implemented using the SC1101 with a minimum of external components. Internal level shift and drive circuitry eliminates the need for an expensive p-channel, high-side switch. The small device footprint allows for compact circuit design.

SC1101 features include a temperature compensated voltage reference, triangle wave oscillator, current limit comparator, frequency shift over-current protection, and an internally compensated error amplifier. Pulse by pulse current limiting is implemented by sensing the differential voltage across an external resistor, or an appropriately sized PC board trace.

The SC1101 operates at a fixed frequency of 200kHz, providing an optimum compromise between efficiency, external component size, and cost.

Features

◆ Low cost / small size

◆ Switch mode efficiency up to 95

◆ 1 reference voltage accuracy

◆ Over current protection

◆ 500mA output drive

◆ SO-8 package

Applications

◆ Pentium® P55 Core Supply

◆ Low Cost Microprocessor Supplies

◆ Peripheral Card Supplies

◆ Industrial Power Supplies

◆ High Density DC/DC Conversion

SC1101属于集成电路（IC） > PMIC - 稳压器 - DC DC 开关式控制器。Semtech Corporation制造生产的SC1101DC-DC 开关控制器PMIC（电源管理集成电路）DC 到 DC 开关式控制器是用于高效率电路的稳压 IC，其配置为生成高于（突升或步升）或低于（突降或步降）输入电源的输出电源电压。其他拓扑结构可能包括：降压-升压、反激、正激、Cuk、SEPIC、全桥、半桥和推挽式。这些器件不同于需要最小电压并“烧尽”多余电压的线性稳压器。