MAX8667

MAX8667/MAX8668 19-0784; Rev 1; 7/07 EVAALVUAAILTAIOBNLEKIT 1.5MHz Dual Step-Down DC-DC Converters with Dual LDOs and Individual Enables General Description The MAX8667/MAX8668 dual step-down converters with dual low-dropout (LDO) linear regulators are intended to power low-voltage microprocessors or DSPs in portable devices. They feature high efficiency with small external component size. The step-down converters are adjustable from 0.6V to 3.3V (MAX8668) or factory preset (MAX8667) with guaranteed output current of 600mA for OUT1 and 1200mA for OUT2. The 1.5MHz hysteretic-PWM control scheme allows for tiny external components and reduces no-load operating current to 100µA with all outputs enabled. Dual low-quiescent-current, low-noise LDOs operate down to 1.7V supply voltage. The MAX8667/MAX8668 have individual enables for each output, maximizing flexibility. The MAX8667/MAX8668 are available in the spacesaving, 3mm x 3mm, 16-pin thin QFN package. Applications Cell Phones/Smartphones PDA and Palmtop Computers Portable MP3 and DVD Players Digital Cameras, Camcorders PCMCIA Cards Handheld Instruments Typical Operating Circuit Features o Tiny, Thin QFN 3mm x 3mm Package o Individual Enables o Step-Down Converters 600mA Guaranteed Output Current on OUT1 1200mA Guaranteed Output Current on OUT2 Tiny Size 2.2µH Chip Inductor (0805) Output Voltage from 0.6V to 3.3V (MAX8668) Ultra-Fast Line and Load Transients Low 25µA Supply Current Each o LDOs 300mA Guaranteed Low 1.7V Minimu...