STOD13ATPUR STMicroelectronics

STOD13A 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% Pulse skipping mode in light load condition 1.5 MHz PWM mode control switching Description frequency The STOD13A is a dual DC-DC converter for TDMA noise high immunity AMOLED display panels. It integrates a step-up Enable pin for shutdown mode and an inverting DC-DC converter making it Low quiescent current in shutdown mode particularly suitable for battery operated products, in which the major concern is overall system Soft-start with inrush current protection efficiency. It works in pulse skipping mode during Overtemperature protection low load conditions and PWM-MODE at 1.5 MHz Temperature range -40 C to 85 C frequency for medium/high load conditions. The high frequency allows the value and size of True-shutdown mode external components to be reduced. The Enable Fast outputs discharge circuit after 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) 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 Multimedia players Table 1. Device summary Order code Positive voltage Negative voltage Package Packaging STOD13ATPUR 4.6V -2.4V to -6.4V DFN12L (3 x 3mm) 3000 parts per reel December 2011 Doc ID 022599 Rev 1 1/24 www.st.com 24Contents STOD13A 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 . 13 7 Application information . 15 7.1 External passive components . 15 7.1.1 Inductor selection 15 7.1.2 Input and output capacitor selection . 15 7.2 Recommended PCB layout . 16 8 Detailed description 18 8.1 General description . 18 8.1.1 Multiple operation modes 18 8.1.2 Enable pin . 19 8.1.3 Soft-start and inrush current limiting . 19 8.1.4 Undervoltage lockout . 19 8.1.5 Overtemperature protection 19 8.1.6 Short-circuit protection 19 8.1.7 Fast discharge 19 9 Package mechanical data 20 2/24 Doc ID 022599 Rev 1