STMicroelectronics' new fully integrated power management IC (PMIC) for AMOLED displays combines low quiescent current and improved flexibility to extend the battery runtime of portable devices.
With an input voltage range of 2.9 to 4.8 V, the STMP30 PMIC contains three integrated DC-DC converters to provide all the power rails needed for AMOLED displays in smartphones and other portable devices.
The 550mA VOUT1 boost converter has an adjustable output voltage, unlike other devices that fix VOUT1 at 4.6V. Voltage can be set between 4.6 and 5.0 V, in 100 mV increments, to optimize screen brightness for lower power consumption and better visibility under any conditions. The maximum setting of 5.0V allows use of high brightness mode for better viewing in bright outdoor lighting.
The remaining two outputs are provided by a single-phase 550mA buck-boost inverter converter, programmable from -0.8 to -6.6V and 5.5 to 7.9V 150mA. Output voltages are programmed using the Single-Wire (S-Wire) protocol via external pins. The PMIC also receives S-Wire messages to operate the AMOLED in Always-On Display (AOD) mode, which improves user convenience by showing information on the screen continuously with very low power consumption.
The PMIC has a true shutdown mode that helps maximize energy savings, as well as safety features that include thermal protection, input undervoltage lockout, and soft start with inrush current limiting. In addition, the high voltage outputs feature fast discharge circuitry and offer short circuit protection.
