STOD03BTPUR STMicroelectronics

STOD03B 150 mA dual DC-DC converter with LDO for powering AMOLED displays 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 DFN12L (3 x 3 mm) output to provide line and load transient response with minimum output voltage ripple Programmable negative voltage by S from WIRE - 2.4 V to -5.4 V at 100 mV steps Description Typical efficiency: 82% The STOD03B is a dual DC-DC converter for Pulse skipping mode in light load condition AMOLED display panels. It integrates a step-up 1.5 MHz PWM mode control switching and an inverting DC-DC converter making it frequency particularly suitable for battery operated products, Enable pin for shutdown mode in which the major concern is the overall system efficiency. It works in pulse skipping mode during Low quiescent current in shutdown mode low load conditions and PWM-MODE at 1.5 MHz Soft-start with inrush current protection frequency for medium/high load conditions. The Overtemperature protection high frequency allows the value and size of external components to be reduced. The 4.6 V Temperature range: -40 C to 85 C output is provided by an LDO in cascade with the True-shutdown mode step-up converter. This allows a noise and ripple Package DFN (3 x 3) 12 leads 0.6 mm height free positive output for the AMOLED panel to provide stable picture quality. The Enable pin allows the device to be turned off, therefore Applications reducing the current consumption to less than Active matrix AMOLED power supply in 1 A. The negative output voltage can be portable devices programmed by an MCU through a dedicated pin which implements single-wire protocol. Soft-start Cellular phones with controlled inrush current limit and thermal Camcorders and digital still cameras shutdown are integrated functions of the device. Multimedia players Table 1. Device summary Order code Positive voltage Negative voltage Package Packaging STOD03BTPUR 4.6V - 2.4V to - 5.4V DFN12L (3 x 3mm) 3000 parts per reel December 2011 Doc ID 022613 Rev 1 1/22 www.st.com 22Contents STOD03B Contents 1 Schematic . 3 2 Pin configuration 5 3 Maximum ratings 6 4 Electrical characteristics . 7 5 Typical performance characteristics 9 6 Detailed description 10 6.1 S 10 WIRE 6.1.1 S features and benefits . 10 WIRE 6.1.2 S protocol 10 WIRE 6.1.3 S basic operations . 10 WIRE 6.2 Negative output voltage levels . 11 6.3 Enable and S . 11 WIRE 7 Application information . 12 7.1 External passive components . 12 7.1.1 Inductor selection 12 7.1.2 Input and output capacitor selection . 13 7.2 Recommended PCB layout . 13 8 Detailed description 15 8.1 General description . 15 8.1.1 Multiple operation modes 15 8.1.2 Enable pin . 16 8.1.3 Soft-start and inrush current limiting . 16 8.1.4 Undervoltage lockout . 16 8.1.5 Overtemperature protection 16 9 Package mechanical data 17 10 Revision history . 21 2/22 Doc ID 022613 Rev 1