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MAX747 - High-Efficiency PWM / Step-Down P-Channel DC-DC Controller

General Description

The MAX747 high-efficiency, high-current, step-down controller drives external P-channel FETs.

It provides 90% to 95% efficiency from a 6V supply with load currents ranging from 50mA up to 2.5A.

Key Features

  • a 2V ±1.5% reference, a comparator for low-battery detection or level translating, as well as soft-start and shutdown capability. The MAX746, discussed in a separate data sheet, functions similarly to the MAX747, but it drives N-channel logic level FETs on the high side. ____________________________Features o 90% to 95% Efficiency for 50mA to 2.5A Output Currents o 4V to 15V Input Voltage Range o Low 800µA Supply Current o 0.6µA Shutdown Current o Drives External P-Channel FETs o Cycle-by-Cycle.

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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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19-0171; Rev 1; 9/93 High-Efficiency PWM, Step-Down P-Channel DC-DC Controller _______________General Description The MAX747 high-efficiency, high-current, step-down controller drives external P-channel FETs. It provides 90% to 95% efficiency from a 6V supply with load currents ranging from 50mA up to 2.5A. It uses a pulse-width-modulating (PWM) current-mode control scheme to provide precise output regulation and low output noise. The MAX747’s 4V to 15V input voltage range, a fixed 5V/adjustable (Dual-Mode™) output, and a current limit set with an external resistor make this device ideal for a wide range of applications.