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MC34280 - Power Supply & Management IC for Handheld Electronic Products

General Description

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Key Features

  • VMAIN.

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Datasheet Details

Part number MC34280
Manufacturer onsemi
File Size 380.69 KB
Description Power Supply & Management IC for Handheld Electronic Products
Datasheet download datasheet MC34280 Datasheet

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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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MC34280 Power Supply & Management IC for Handheld Electronic Products The MC34280 is a power supply integrated circuit which provides two boost regulated outputs and some power management supervisory functions. 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; or by a microprocessor, digitally through a 6–bit internal DAC. The MC34280 has been designed for battery powered hand–held products.