Communication ICs Surface-mount type power supply unit for LCD drives BP5307 The BP5307 is a DC / DC converter unit designed for driving liquid crystal displays (LCDs). The unit supplies a positive voltage for LCDs from a logic circuit power supply (5V). Being in a compact and light surface-mount package, the IC can be built into a LCD panel. Applications LCD panels of personal computers, word processors, and copiers Features 1) Automatic mounting and reflow soldering are possible. 2) With a maximum thickness of 4.1mm, the IC can be built into a LCD panel. 3) Output voltage can be regulated by a microcontroller. 4) Discharg circuit is built in for output. (Fall time: 1ms Typ.) Absolute maximum ratings (Ta = 25C) Block diagram 583 Communication ICs Pin descriptions Electrical characteristics (unless otherwise noted, Ta = 25C and VCTL = 0.8V) 584 BP5307 Communication ICs BP5307 Measurement circuit Electrical characteristic curves 585 Communication ICs Recommended pad dimensions Operation notes The soldering used inside the unit is eguivalent to H63 solder, so it will remelt during reflow. Be sure not to subject the unit to any vibrations when passing through the reflow furnace. External dimensions (Units: mm) 586 BP5307