Features and Benefits
- 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)
- 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 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.
- AGP and PCI Express® Power Supplies
- Graphic-Card Power Supplies
- Motherboard Power Supplies
- Point-of-Load Power Supplies
- Set-Top Boxes
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Documentation & Resources
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
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