Fully Integrated Power Management IC for AMOLED Displays extends the Battery Runtime of Portable Devices

Published  April 7, 2022   0
L Lakshita
STMP30 Power Management IC

STMicroelectronics has introduced a fully integrated Power-Management IC (PMIC) that contains three integrated DC-DC converters to provide all the power rails needed for AMOLED displays in smartphones and other portable devices. The new STMP30 PMIC with an input-voltage range from 2.9V to 4.8V combines a low quiescent current and enhanced flexibility to extend the battery runtime of portable devices.

The 550mA VOUT1 boost converter has an adjustable output voltage, unlike other devices that fix VOUT1 at 4.6V. The voltage can be set between 4.6V and 5.0V, in 100mV increments, to optimize the display brightness for the lowest power consumption and best visibility under any conditions. The 5.0V maximum setting allows the use of High-Brightness Mode (HBM) for best viewing in bright outdoor lighting.

The remaining two outputs are provided by a 550mA single-phase buck-boost inverting converter, programmable from -0.8V to -6.6V, and a 5.5V to 7.9V 150mA boost converter. The output voltages are programmed using Single-Wire (S-Wire) protocol through 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-screen continuously at very low power.

Key Features

  • 2.9V to 4.8V input voltage range.
  • VOUT1 boost converter output current up to 550mA with programmable output voltage by ESwire (4.6V to 5.0V) default 4.6V.
  • VOUT2 single-phase buck-boost inverting converter output current up to 550mA with programmable output voltage by ESwire (-0.8V to -6.6V) default -3.0V.
  • VOUT3 boost converter output current up 150mA with programmable output voltage by ASwire (5.5V to 7.9V) default 7.3V. UVLO on input voltage.
  • Fast Discharge circuitry for outputs Hi-Z.
  • True shut down mode.
  • Soft-start with inrush current limitation.
  • Over temperature protection.
  • Short circuit protection.

Moreover, this PMIC has a true shutdown mode that helps maximize power savings, as well as safety features that include thermal protection, input under-voltage lockout, and soft-start with inrush current limiting.