MC33680 Datasheet | onsemi

MC33680 Dual DC- DC Regulator for Electronic Organizer The MC33680 is a dual DC- DC regulator designed for electronic organizer applications. Both regulators apply Pulse- Frequency- Modulation (PFM). The main step- up regulator output can be externally adjusted from 2.7V to 5V. An internal synchronous rectifier is used to ensure high efficiency (achieve 87%). The auxiliary regulator with a built- in power transistor can be configured to produce a wide range of positive voltage (can be used for LCD contrast voltage). This voltage can be adjusted from +5V to +25V by an external potentiometer. The MC33680 has been designed for battery powered hand- held products. With the low start- up voltage from...