MAX8598 Datasheet | Maxim Integrated

19-3505; Rev 0; 11/04 KIT ATION EVALU E L B A AVAIL .. Low-Dropout, Wide-Input-Voltage, Step-Down Controllers General Description 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 200k Hz 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 MAX8597/MAX8598/MAX8599 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 pchannel high-side MOSFET to achieve high duty cycle, the MAX8597/MAX8598/MAX8599 drive n-channel MOSFETs resulting in high efficiency and high-currentcapability designs. The MAX8597 is available in a 20-pin thin QFN package and is designed for applications that use an analog signal to control the output voltage with an adjustable offset, such as DC fan-speed control. This is achieved with an internal unmitted operational amplifier. The MAX8597 is also targeted for tracking output-voltage applications for chipsets, ASIC and DSP cores, and I/O supplies. The MAX8598/MAX8599 are available in a 16pin thin QFN package and do not have the unmitted operational amplifier, reference input, and reference output, but offer an open-drain, power-OK output. The MAX8597/MAX8598/MAX8599 allow startup with prebias voltage on the output for applications where a backup supply or a...