The document describes a dual DC-DC converter called STOD02, which is designed to power AMOLED displays. The converter features step-up and inverter converters, an operating input voltage range from 2.5V to 4.5V, synchronous rectification for both converters, a maximum output current of 150mA, a fixed positive output voltage of 4.6V, and a programmable negative voltage from -2.3V to -5.9V. It also has a typical efficiency of 85%, pulse skipping mode in light load condition, PWM mode control switching frequency of 1.6MHz, shutdown mode with low quiescent current, soft-start with inrush current protection, over temperature protection, and a temperature range of -40°C to 85°C. The converter is suitable for active matrix organic LED power supply, mobile phones, PDAs, camcorders, and digital still cameras.
The STODO2 is a dual DC-DC converter intended for powering AMOLED displays in battery-operated products such as mobile phones, PDAs, and digital cameras. It integrates a step-up converter and an inverting converter to provide a fixed 4.6 V positive output and a programmable negative output ranging from -2.3 V to -5.9 V via an S-wire protocol.
The device operates in pulse skipping mode for light loads and PWM mode at 1.6 MHz for medium to high loads, allowing for a minimal external component count of just six. Key features include synchronous rectification, soft-start with inrush current protection, and a true shutdown mode with quiescent current below 1 µA.
| Fixed positive output voltage | 4.6 V |
|---|---|
| Maximum output current | 150 mA |
| Typical efficiency | 85 % |
| Switching frequency (PWM mode) | 1.6 MHz |
| Quiescent current (shutdown) | < 1 µA |
| Operating temperature range | -40 °C to 85 °C |
| Package type | DFN 12 leads |
It is a dual DC-DC converter meant to power AMOLED displays in battery-operated products.
Just 6 external components are needed due to the high switching frequency.
The negative output voltage can be programmed by an MCU through a dedicated pin using a single-wire protocol.