MAX1742 PDF Datasheet


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Description

This is Step-Down Regulators. MAX1742, MAX1842 19-1760; Rev 2; 9, 05 EVAALVUAAILTAIOBNLEKIT 1A, 2.7A, 1MHz, Step-Down Regulators with Synchronous Rectification and Internal Switches General Description The MAX1742, MAX1842 constant-off-time, pulse-widthmodulated (PWM) step-down DC-DC converters are ideal for use in 5V and 3.3V to low-voltage conversion necessary in notebook and subnotebook computers. These devices feature internal synchronous rectification for high efficiency and reduced component count. They require no external Schottky diode. The internal 90mΩ PMOS power switch and 70mΩ NMOS synchronous-rectifier switch easily deliver continuous load currents up to 1A. The MAX1742, MAX1842 produce a preset 2.5V, 1.8V, or 1.5V output voltage or an adjustable output from 1.1V to VIN. They achieve efficiencies as high as 95%. The MAX1742, MAX1842 use a unique current-mode, constant-off-time, PWM control scheme, which includes Idle Mode™ to maintain high efficiency during light-load operation. The programmable cons.