MAX746 PDF Datasheet


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Description

This is High-Efficiency / PWM / Step-Down / N-Channel DC-DC Controller. 19-0192; Rev 1; 11, 93 High-Efficiency, PWM, Step-Down, N-Channel DC-DC Controller _______________General Description The MAX746 is a high-efficiency, high-current, step-down DC-DC power-supply controller that drives external N-channel FETs. It provides 93% to 96% efficiency from a 6V supply voltage with load currents ranging from 50mA up to 3A. It uses a pulse-width-modulating (PWM) current-mode control scheme to provide precise output regulation and low output noise. The MAX746's 4V to 15V input voltage range, fixed 5V, adjustable (Dual-ModeTM) output, and adjustable current limit make this device ideal for a wide range of applications. High efficiency is maintained with light loads due to a proprietary automatic pulse-skipping control (Idle-ModeTM) scheme that minimizes switching losses by reducing the switching frequency at light loads. The low 950 A quiescent current and ultra-low 1.4 A shutdown current further extend battery life. External components are protected by the MAX746'.