The MAX15048/MAX15049 are precision engineered to eliminate external components and save costs. They operate from a wide 4.7V to 23V input range to support low-cost battery packs, as well as the latest 40nm ASICs. Each PWM section operates from a programmable switching frequency (200kHz to 1.2MHz). Operating at 1.2MHz and 120 degrees out-of-phase increases the input capacitor ripple frequency to 3.6MHz. This significantly reduces the RMS input ripple current and, thus, the size of the input bypass capacitor. The MAX15048/MAX15049 integrate bootstrap diodes for additional system cost savings.
These devices feature digital soft-start/soft-stop for glitch-free power-up and power-down. Power-good circuitry monitors all three outputs and provides a signal to the system controller/processor when all outputs are within regulation to enable system-level monitoring. Integrated protection features include lossless valley-mode current limiting, hiccup-mode output short-circuit protection, and thermal shutdown.