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MAX669 Datasheet 1.8v To 28v Input / Pwm Step-up Controllers

Manufacturer: Maxim Integrated (now Analog Devices)

Overview: MAX668/MAX669 General.

General Description

The MAX668/MAX669 constant-frequency, pulse-widthmodulating (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.

Key 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 o.

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MAX669 Distributor