STOD2540PUR STMicroelectronics

STOD2540 PMOLED display power supply Features Inductor switches boost controller PFM mode control High efficiency over wide range of load (1 mA to 40 mA) Integrated load disconnect switch Over voltage protection with automatic restart QFN8 (3 x 3 mm) Soft start with adjustable peak current limit Enable pin Low shutdown current Small external inductor In this state-of-the-art boost converter, a DC Supply voltage from 3.0 V to 5.5 V current path exists between the battery source and the load. In order to reduce the consumption Application in shutdown mode, a high-side load isolation switch is necessary to cut this DC current path in PMOLED display driver standby mode. The load disconnect switch (LDS) act as an isolation switch in shutdown mode. Description STOD2540 is dedicated to passive matrix OLED (PMOLED) displays for portable handsets and provides the pre-charge and biasing voltage of the column matrix driver as shown in figure 3. The current capability of STOD2540 allows feeding a 1 , 1.3 or 1.5 color PMOLED. STOD2540 is a boost converter that operates from 3.0 V to 5.5 V and can provide an output voltage as high as 25 V. The output current capability is maximum 40 mA up to 25 V output voltage. The regulation is performed by a resistor divider network (figure 3) that detects the output voltage. Table 1. Device summary Order code Package Packaging STOD2540PUR QFN8 (3 x 3 mm) 3000 parts per reel July 2010 Doc ID 12204 Rev 10 1/20 www.st.com 20Contents STOD2540 Contents 1 Diagram . 3 2 Pin configuration 4 3 Maximum ratings 5 4 Electrical characteristics . 6 5 Functional description . 8 5.1 Boost controller . 8 5.2 Adjustable peak inductor current limit 8 5.3 Enable 8 5.4 OVP 8 5.5 Load isolation switch . 9 5.6 Efficiency 9 5.7 Under voltage lockout (UVLO) 9 6 Typical application . 10 6.1 Demonstration board 11 7 Typical performance characteristics . 12 8 Package mechanical data 15 9 Revision history . 19 2/20 Doc ID 12204 Rev 10