General Description
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.

Features
♦ 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

Applications
  Cellular Telephones
  Telecom Hardware
  LANs and Network Systems
  POS Systems