General Description
The MAX8597/MAX8598/MAX8599 voltage-mode PWM step-down controllers are designed to operate from a 4.5V to 28V input supply and generate output voltages down to 0.6V. A proprietary switching algorithm stretches the duty cycle to >99.5% for low-dropout design. Unlike conventional step-down regulators using a p-channel high-side MOSFET to achieve high duty cycle, the MAX8597/MAX8598/MAX8599 drive n-channel MOSFETs resulting in high efficiency and high-currentcapability designs.

Features
♦ Low Dropout with >99.5% Duty Cycle
♦ Lossless High-Side Current Limit
♦ Wide 4.5V to 28V Input Range
♦ Dynamic Output Voltage Adjustment with Adjustable Offset (MAX8597)
♦ Remote Voltage Sensing for Both Positive and Negative Rails (MAX8597)
♦ Tracking Output Through REFIN (MAX8597)
♦ Adjustable Switching Frequency from 200kHz to 1.4MHz
♦ Adjustable Soft-Start
♦ Prebias Startup
♦ Enable and Power-OK (MAX8598/MAX8599) for Flexible Sequencing
♦ 25MHz Error Amplifier
♦ Adjustable Hiccup Current Limit for Output Short-Circuit Protection
♦ Output Overvoltage Protection (MAX8599)
♦ Small, Low-Profile Thin QFN Package

Applications
    Nonisolated Power Modules
    Variable-Speed DC Fan Power Supplies (MAX8597)
    Tracking Power Supplies (MAX8597)
    Chipset Power Supplies