User Manual
MAX8576-MAX8579 is a low-cost, 3V to 28V input, hysteresis synchronous step-down controller with the following features: 1.2% accuracy, adjustable output voltage, 200kHz to 500kHz switching frequency, adjustable, temperature-compensated 'hiccup' current limiting, non-destructive peak current detection, monotonic start-up from prebiased output (MAX8576/MAX8578), start-up overvoltage protection (MAX8577/MAX8579), enable/disable, and adjustable soft-start.
User Manual
The MAX8576-MAX8579 synchronous PWM buck controllers use a hysteretic voltage-mode control algorithm to achieve a fast transient response without requiring loop compensation. The MAX8576/MAX8577 contain an internal LDO regulator allowing the controllers to function from only one 3V to 28V input supply. The MAX8578/MAX8579 do not contain the internal LDO and require a separate supply to power the IC when the input supply is higher than 5.5V. The MAX8576-MAX8579 output voltages are adjustable from 0.6V to 0.9 x VIN at loads up to 15A. Nominal switching frequency is programmable over the 200kHz to 500kHz range. High-side MOSFET sensing is used for adjustable hiccup current-limit and short-circuit protection. The MAX8576/MAX8578 can start up into a precharged output without pulling the output voltage down. The MAX8577/MAX8579 have startup output overvoltage protection (OVP), and will pull down a precharged output.
