MAX668 - 1.8V至28V输入、PWM升压型控制器，µMAX封装

MAX668是Maxim美信半导体公司的一款DC-DC开关调节器产品，MAX668是1.8V至28V输入、PWM升压型控制器，µMAX封装，本站介绍了MAX668的封装应用图解、特点和优点、功能等，并给出了与MAX668相关的Maxim元器件型号供参考。

MAX668 - 1.8V至28V输入、PWM升压型控制器，µMAX封装 - DC-DC开关调节器 - 灵活的转换架构提供升压、SEPIC、反激或隔离拓扑，MAX668输出电压仅受外部元件额定值的限制 - 美信半导体

产品概述

The MAX668/MAX669 constant-frequency, pulse-width modulating (PWM), current-mode DC-DC controllers are designed for a wide range of DC-DC conversion applications including step-up, SEPIC, flyback, and isolated-output configurations. Power levels of 20W or more can be controlled with conversion efficiencies of over 90%. The 1.8V to 28V input voltage range supports a wide range of battery and AC-powered inputs. An advanced BiCMOS design features low operating current (220µA), adjustable operating frequency (100kHz to 500kHz), soft-start, and a SYNC input allowing the MAX668/MAX669 oscillator to be locked to an external clock.

DC-DC conversion efficiency is optimized with a low 100mV current-sense voltage as well as with Maxim's proprietary Idle Mode™ control scheme. The controller operates in PWM mode at medium and heavy loads for lowest noise and optimum efficiency, then pulses only as needed (with reduced inductor current) to reduce operating current and maximize efficiency under light loads. A logic-level shutdown input is also included, reducing supply current to 3.5µA.

The MAX669, optimized for low input voltages with a guaranteed start-up voltage of 1.8V, requires boot-strapped operation (IC powered from boosted output). It supports output voltages up to 28V. The MAX668 operates with inputs as low as 3V and can be connected in either a bootstrapped or non-bootstrapped (IC powered from input supply or other source) configuration. When not bootstrapped, it has no restriction on output voltage. Both ICs are available in an extremely compact 10-pin µMAX® package.

关键特性

以下关键特性由Maxim美信半导体提供：

1.8V Minimum Start-Up Voltage (MAX669)

Wide Input Voltage Range (1.8V to 28V)

Tiny 10-Pin µMAX Package

Current-Mode PWM and Idle Mode Operation

Efficiency Over 90%

Adjustable 100kHz to 500kHz Oscillator or SYNC Input

220µA Quiescent Current

Logic-Level Shutdown

Soft-Start

热门应用

音频系统

LAN与网络系统

POS系统

电信硬件

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