MAX8579

Obsolete

3V to 28V Input, Low-Cost, Hysteretic Synchronous Step-Down Controllers

Data Sheet (Rev. 1) Product Selection Table

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Overview

3V to 28V Supply Voltage Range
1.2% Accurate Over Temperature
Adjustable Output Voltage Down to 0.6V
200kHz to 500kHz Switching Frequency
Adjustable Temperature-Compensated Hiccup Current Limit
Lossless Peak Current Sensing
Monotonic Startup into Prebias Output (MAX8576/MAX8578)
Startup Overvoltage Protection (MAX8577/MAX8579)
Enable/Shutdown
Adjustable Soft-Start

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 V_IN 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.

Applications