MAX8744AETJ+ [Analog Devices]

The MAX8744A/MAX8745A are dual step-down, switch-mode power supply controllers with synchronous rectification, designed for main 5V/3.3V power generation in battery-powered systems. They feature fixed-frequency, current-mode control with optimal 40/60 interleaving to minimize input ripple current. The controllers include internal BST switches, a 5V/100mA linear regulator, and an auxiliary linear-regulator driver for 12V or adjustable down to 1V outputs. They offer dual-mode feedback for fixed 3.3V/5V or adjustable output voltages, with switching frequencies of 200kHz, 300kHz, or 500kHz. Protection features include undervoltage, thermal-fault, and overvoltage-fault protection (MAX8744A only). The devices operate from a 6V to 26V input range, provide a 2V ±0.75% reference output, and have independent enable inputs and power-good outputs. Soft-start and soft-shutdown functions reduce inrush current and prevent negative voltage dips. The shutdown current is typically 8µA. They are available in a 32-pin, 5mm x 5mm thin QFN package with an exposed pad for improved thermal performance.