Description
The STOD03B is a dual DC-DC converter for AMOLED display panels. It integrates a step-up and an inverting DC-DC converter making it particularly suitable for battery operated products, in which the major concern is the overall system efficiency. It works in pulse skipping mode during low load conditions and PWM-MODE at 1.5 MHz frequency for medium/high load conditions. The high frequency allows the value and size of external components to be reduced. The 4.6 V output is provided by an LDO in cascade with the step-up converter. This allows a noise and ripple free positive output for the AMOLED panel to provide stable picture quality. The Enable pin allows the device to be turned off, therefore reducing the current consumption to less than 1 µA. The negative output voltage can be programmed by an MCU through a dedicated pin which implements single-wire protocol. Soft-start with controlled inrush current limit and thermal shutdown are integrated functions of the device. DFN12L (3 x 3 mm)

Features
■ Step-up with LDO and inverter converters
■ Operating input voltage range from 2.3 V to 4.8 V
■ Synchronous rectification for both DC-DC converters
■ Minimum 150 mA output current
■ LDO post regulator for 4.6 V fixed positive output to provide line and load transient response with minimum output voltage ripple
■ Programmable negative voltage by SWIRE from
■ 2.4 V to -5.4 V at 100 mV steps
■ Typical efficiency: 82%
■ Pulse skipping mode in light load condition
■ 1.5 MHz PWM mode control switching frequency
■ Enable pin for shutdown mode
■ Low quiescent current in shutdown mode
■ Soft-start with inrush current protection
■ Overtemperature protection
■ Temperature range: -40 °C to 85 °C
■ True-shutdown mode

Applications
■ Active matrix AMOLED power supply in portable devices
■ Cellular phones
■ Camcorders and digital still cameras
■ Multimedia players