The MAX15048/MAX15049 are triple-output pulse-width modulated (PWM), step-down, DC-DC controllers with tracking (MAX15048) and sequencing (MAX15049) options. The devices operate over the 4.7V to 23V input-voltage range. Each PWM controller provides an adjustable output down to 0.6V and delivers up to 15A of load current with excellent load and line regulation. The MAX15049 can start into prebiased outputs. The MAX15048/MAX15049 are optimized for high-performance, small-size power-management solutions.
The options of coincident or ratiometric tracking (MAX15048) or output sequencing (MAX15049) allow the tailoring of the power-up/power-down sequence depending on the system requirements. Each of the MAX15048/MAX15049 PWM sections utilizes a voltage-mode control scheme with external compensation, allowing for good noise immunity and maximum flexibility with a wide selection of inductor values and capacitor types. Each PWM section operates at the same fixed switching frequency that is programmable from 200kHz to 1.2MHz. Each converter, operating at up to 1.2MHz with 120° out-of-phase, increases the input capacitor ripple frequency up to 3.6MHz, reducing the RMS input ripple current and thus the size of the input bypass capacitor significantly. The MAX15048/MAX15049 integrate boost diodes for additional system cost savings.
The MAX15048/MAX15049 include internal undervoltage lockout (UVLO) with hysteresis and digital soft-start (MAX15048/MAX15049)/soft-stop (MAX15048) for glitch-free power-up and power-down of the converter. The power-good circuitry (PGOOD) monitors all three outputs and provides a power-good signal to the system control/processor when all outputs are within regulation. Protection features include lossless valley-mode current limit, hiccup mode output short-circuit protection, and thermal shutdown.
The MAX15048/MAX15049 are available in space-saving, 5mm x 5mm, lead-free, 32-pin TQFN-EP packages and are specified for operation over the -40°C to +85°C extended temperature range.
Applications
- ASIC/CPU/DSP Core and I/O Voltages
- Base-Station Power Supplies
- DDR Power Supply
- Point-of-Load DC-DC Converters
- RAID Control Power Supplies
- Set-Top Boxes
- Telecom and Networking Power Supplies
