SI9118DY-E3

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The SI9118DY-E3 can be classified as a DC-DC switching controller with its application field being a PMIC solution (power management ICs). It is a two step non-synchronous boost converter with a wide range voltage input, very low quiescent current, and several protection features. This article will discuss the SI9118DY-E3 application field and working principle.

Application Field

The SI9118DY-E3 PMIC is designed for integration into low voltage portable devices. It is perfect for applications that require higher voltage output for CPU, FPGA, DSP and memory ICs. The device has a wide operating range, making it suitable for powered products, such as digital cameras, PDAs, cell phones, gaming devices, radios, and MP3 players. The device includes an ultra low-power shutdown mode, allowing it to be efficiently managed in mobile environments. It is completely protected by the over voltage protection, current limit, and over temperature protection features.

The PMIC integrates a two-step non-synchronous boost converter, which provides an output voltage level up to 3.3V, thus enabling higher voltage margins for power management systems.

The device includes two independent power-good comparators, one for each output port. The output voltage levels can be monitored through these ports.

Working Principle

The SI9118DY-E3 PMIC is based on a two-step non-synchronous boost converter topology. It uses a charge pump for isolating voltage step-up and for eliminating external tansformers and inductors. The device requires an input voltage of up to 5.25V, and delivers an output voltage of up to 3.3V.

The functionality of the device is based on the charge pump topology, which consists of two switches, two linear regulators and two capacitors. The output voltage is a fixed ratio of the input voltage multiplied by the ratio of the capacitors. The duty cycle of the switches is automatically adjusted to keep the output voltage at a set level.

The two linear regulators provide two separate power supplies for the output ports. Each regulator is locally regulated and includes its own power good signal. Additionally, the device includes an over voltage protection, current limit, and over temperature protection features.

The SI9118DY-E3 PMIC is designed for integration into low voltage portable devices. It is compatible with both AC and DC input, making it the ideal solution for mobile applications. Its wide input range, high output power, low quiescent current, multiple protection features make it an ideal device for powering CPU, FPGA, DSP and memory ICs.

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