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PMIC – Voltage Regulators – DC DC Switching Regulators

The LT8580HDD#TRPBF is a PWM controller for DC-DC switching converters that eliminates the need for an opto-coupler for feedback and frequency setting. It includes many features commonly used in today\'s switched-mode power supplies such as integrated or external digital soft-start, adjustable current limit, adjustable voltage reference, integrated N-channel MOSFET gate driver, adjustable reference voltage, and overcurrent and overvoltage protection. This combination of features and its simple design makes it suitable for many applications.

Application Field and Working Principle

The LT8580HDD#TRPBF is suitable for efficient high-voltage, step-down power conversion applications such as +12V to +5V, +3.3V, +2.5V, +1.8V, +1.2V, +0.9V and +0.6V variations. Its integrated switch MOSFET gate driver and adjustable high-side current sense limit are specially designed to operate with external N-Channel MOSFET switches up to 85V. It dynamically maintains constant voltage or current operation mode, depending on the user-selected parameters. Its soft-start feature, adjustable switching frequency and synchronizable operation enable the LT8580HDD#TRPBF to be applied in a number of configurations, from single-inductor buck converters to synchronous step-down and flyback converters.

The controller uses peak current mode control and includes an internal high-side sense circuit suitable for producing peak currents in external N-Channel switches. This is accomplished by importing voltage or current information from the feedback and by comparing it against the internal reference (V REF ) and the output of the error amplifier (EAOUT). The error signals are combined and processed in the loop filter to generate an error signal voltage. This voltage is used as an input to the pulse-width modulator (PWM) stage, which determines the duty cycle of the MOSFET switch.

During steady-state operation, the controller samples the feedback voltage or current and compares it to the internal voltage reference. If there is insufficient voltage or current, then the controller increases the duty cycle accordingly. Conversely, when the feedback voltage or current is too high, the controller reduces the duty cycle. As a result, the output voltage or current will remain constant and error free, provided that the load current remains within specified limit.

Features and Benefits

Excellent load transient response is provided by the integrated voltage reference, which minimizes the current peak-to-peak during discontinuity, and the fast-acting, adjustable peak-current limit circuit. The switch MOSFET gate driver can easily control a variety of power switches with high voltage and low on-resistance characteristics, aiming to reduce system power loss. In addition, the comprehensive protection feature in the LT8580HDD#TRPBF, such as over-current protection (OCP) and over-voltage protection (OVP), further enhance the reliability of the system.

The LT8580HDD#TRPBF PWM controller includes a wide range of features to fit different system design requirements. The simple design of the controller allows for an efficient and fast system development. The features include an adjustable switching frequency up to 2.2Mhz, synchronizable to external clock signals, adjustable current limit, an adjustable reference voltage, adjustable soft-start charging and discharging time, integrated skip-mode operation and a low quiescent current.

The LT8580HDD#TRPBF is a versatile and fully integrated DC-DC converter controller solution suitable for many applications. It supports various output voltages, adjustable current limit and frequency settings. The integrated N-Channel MOSFET driver makes it easier to design a control circuit and reduce power loss. The output voltage or current can be easily maintained with the built-in feedback control. The adjustable soft-start feature helps reduce inrush current and minimize supply voltage ringing. The features and benefits of the LT8580HDD#TRPBF make it the ideal choice for a high-performance DC-DC conversion solution.

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