MC33680中文资料Dual DC-DC Regulator for Electronic Organizer数据手册ONSEMI规格书

描述 Description

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 1V and the low quiescent current (typical 35 µA); the MC33680 is best suited to operate from 1 to 2 AA/ AAA cell. Moreover, supervisory functions such as low battery detection, CPU Power-Good signal, and back-up battery control, for lithium battery or supercap are also included in the chip.

特性 Features

• Low Input Voltage, 1V up
• PFM and Synchronous Rectification to ensure high efficiency (87% @60mA Load)
• Auxiliary Output Voltage: +5V to +25V+5V @ 25mA max, with 1.8V input+25V @ 15mA max, with 1.8V input
• Power-Good Signal with Programmable Delay
• Lithium Battery or Supercap Back-up
• 32-Pin LQFP Package

应用 Application

Digital Organizer and Dictionary Dual Output Power Supply (For MPU, Logic, Memory, LCD) Handheld Battery Powered Device (1-2 AA/AAA cell)

简介

MC33680属于集成电路（IC）的稳压器-DC-DC开关稳压器。由制造生产的MC33680稳压器 - DC-DC 开关稳压器DC-DC 开关稳压器 PMIC（电源管理集成电路）产品族中的产品是元器件级设备，用于需要稳定 DC 输入电压和/或将其转换为不同幅度的输出电压的应用。这些器件与称为“控制器”PMIC 的类似产品的区别在于集成了主开关元件，设备提供的电力会通过该元件。