MAX860ISA-T

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The MAX860ISA-T is an integrated switching regulator voltage controller with an integrated oscillator, optimized for low part count off-line and isolated DC/DC converters. It offers the highest level of features, performance and value. This switching regulator controller offers an industry-leading 30kHz minimum frequency for achieving higher power-level operation, efficient topology for offline applications, and more optimized performance.

The MAX860ISA-T integrates a low-ripple current-mode controller, providing excellent line and load regulation, as well as fast transient response, into one monolithic device. A 0.75V current-limit voltage reference and an adjustable oscillator permit the setting of any necessary peak switch current level, while keeping the controller operating frequency within its adjustable range. Integrated features such as an internal soft-start and power-on reset generator eliminate the need for external components, saving board space and cost. The MAX860ISA-T is protected from overvoltage, over current, and overtemperature.

The MAX860ISA-T is suitable for applications in a variety of voltage regulated DC/DC topologies, including buck, boost, and single-ended primary-inductor converters (SEPIC), as well as flyback. It can generate a level-shifted output with a single winding, eliminating the need for a forward converter. It is also suitable for isolated topologies with a 3-winding transformer, such as half-bridge and full-bridge. The IC also features low-startup current and soft start and stop functions, as well as underground push-pull transformer drivers.

The MAX860ISA-T is designed to operate with a wide input voltage range of up to 60V and can swing up to 500V on the switching node. The device features a 20mA maximum operating current, with a 10mA typ. startup current. The device is capable of delivering up to 2W of total output power. Its low operating voltage and current allow it to be used in portable and low-power applications. The MAX860ISA-T is housed in a 16-pin SOIC package, offering a high level of integration, making it ideal for use in space-constrained applications.

Internally, the MAX860ISA-T has a control loop with frequency control. During each cycle, the current-mode control loop measures the inductor current and compares it to a voltage ramp waveform. An internal oscillator generates a clock signal that is divided down to a frequency at or below the desired operating frequency. This clock signal triggers the switching of the output MOSFET. The output of the inverting current-mode amplifier will decrease or increase depending on the error between the inductor current and the ramp waveform. Thus, a dynamic control loop is formed, creating a regulated output voltage.

The MAX860ISA-T provides exceptionally high power efficiency and excellent line and load transient performance. It also features integrated resistors and capacitors, allowing you to quickly adjust to different operating conditions. The device is designed to operate with a variety of external components and can be configured to provide a wide range of output voltage and current levels. The device is also highly integrated, eliminating the need for additional external components, leading to a smaller overall solution size.

Overall, the MAX860ISA-T is an efficient, high-performance switching regulator controller suitable for a variety of off-line and isolated DC/DC converter applications. It is capable of providing up to 2W of total output power and features a wide input voltage range and low operating current to make it suitable for a number of low-power, portable applications. The integrated features such as the internal soft-start and power-on reset generator make it a great choice for reducing component count and saving board space. The device is highly integrated, making it an ideal choice for space-constrained applications.

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