STOD13ASTPUR STMicroelectronics

STOD13AS 250 mA dual DC-DC converter for powering AMOLED displays Features Step-up and inverter converters Operating input voltage range from 2.5 V to 4.5 V Synchronous rectification for both DC-DC converters Minimum 250 mA output current 4.6 V fixed positive output voltage DFN12L (3 x 3 mm) Programmable negative voltage by S from WIRE -2.4 V to -6.4 V at 100 mV steps Typical efficiency: 85% Multimedia players Pulse skipping mode in light load condition 1.5 MHz PWM mode control switching frequency Description TDMA noise high immunity The STOD13AS is a dual DC-DC converter for Enable pin for shutdown mode AMOLED display panels. It integrates a step-up Low quiescent current in shutdown mode and an inverting DC-DC converter making it particularly suitable for battery operated products, Soft-start with inrush current protection in which the major concern is overall system Overtemperature protection efficiency. It works in pulse skipping mode during Temperature range: -40 C to 85 C low load conditions and PWM-MODE at 1.5 MHz frequency for medium/high load conditions. The True-shutdown mode high frequency allows the value and size of Fast discharge outputs of the circuits after external components to be reduced. The Enable shutdown pin allows the device to be turned off, therefore Short-circuit protection reducing the current consumption to less than 1 A. The negative output voltage can be Package DFN12L (3 x 3 mm) 0.6 mm height programmed by an MCU through a dedicated pin which implements single-wire protocol. Soft-start Applications with controlled inrush current limit, thermal shutdown, and short-circuit protection are Active matrix AMOLED power supply in integrated functions of the device. portable devices Cellular phones Camcorders and digital still cameras Table 1. Device summary Order code Positive voltage Negative voltage Package Packaging STOD13ASTPUR 4.6V -2.4V to -6.4V DFN12L (3 x 3mm) 3000 parts per reel January 2012 Doc ID 022733 Rev 1 1/25 www.st.com 25Contents STOD13AS Contents 1 Schematic . 3 2 Pin configuration 5 3 Maximum ratings 6 4 Electrical characteristics . 7 5 Typical performance characteristics . 10 6 Detailed description 12 6.1 S 12 WIRE 6.1.1 S features and benefits . 12 WIRE 6.1.2 S protocol . 12 WIRE 6.1.3 S basic operations . 12 WIRE 6.2 Negative output voltage levels . 12 6.3 Enable, S and FD . 13 WIRE 7 Application information . 14 7.1 External passive components . 14 7.1.1 Inductor selection 14 7.1.2 Input and output capacitor selection . 14 7.2 Recommended PCB layout . 15 8 Detailed description 17 8.1 General description . 17 8.1.1 Multiple operation modes 17 8.1.2 Pulse skipping operation 17 8.1.3 Discontinuous conduction mode 17 8.1.4 Continuous conduction mode 17 8.1.5 Enable pin . 18 8.1.6 Soft-start and inrush current limiting . 18 8.1.7 Undervoltage lockout . 18 8.1.8 Overtemperature protection 18 2/25 Doc ID 022733 Rev 1