LTC3823EUH#TRPBF

PMIC - Voltage Regulators - DC DC Switching Controllers

The LTC3823EUH#TRPBF is a DC-DC switching controller IC designed to provide excellent performance and maximum flexibility in a wide variety of applications including notebook and tablet computer power supplies, hard drives, routers and modems, and video game consoles. It has a wide input voltage range, high switching frequency, and high efficiency across a wide load range. This makes it suitable for a variety of power-sensitive applications, from portable battery-powered devices to systems operating from AC power supplies.

Application Fields

The LTC3823EUH#TRPBF is suitable for a wide variety of applications, from portable power supplies for notebook and tablet computers, to hard drives and routers/modems, to game consoles. Its wide input voltage range, adjustable switching frequency, and high efficiency make it ideal for a variety of power-sensitive applications.

The controller can be used to create high efficiency synchronous buck converters, both discontinuous and continuous current mode, with an operating frequency range of 50kHz to 2MHz. This makes it ideal for low noise, high efficiency power supplies, and the wide variety of output voltage, current, and load variations make it suitable for a wide range of applications.

The controller also has several features to ensure safe operation, including undervoltage lockout (UVLO), thermal shutdown, and overcurrent protection. These make it ideal for use in high power applications such as notebook and tablet computer power supplies, where safety is of the utmost importance.

Working Principle

The working principle of the LTC3823EUH#TRPBF is based on the use of a high-frequency synchronous buck converter that uses synchronous rectification to achieve high efficiency. In this type of converter, the inductor current is regulated by a fixed frequency variable pulse-width modulated (PWM) control circuit. The PWM control circuit is regulated by an input voltage (Vin), a reference voltage (Vref), and an error amplifier (EA).

When the Vin is equal to or less than Vref, the error amplifier will drive the PWM control circuit to decrease the duty cycle of the switching transistor. This decreases the amount of current flowing through the inductor, thereby reducing the output voltage. In this way, the duty cycle of the switching transistor is adjusted in order to regulate the output voltage of the converter. When the Vin is equal to or greater than the reference voltage, the PWM control circuit increases the duty cycle of the switching transistor and the output voltage is increased.

The LTC3823EUH#TRPBF also utilizes a constant frequency current mode control loop. This is a feedback loop that ensures constant switching frequency regardless of input voltage or output load. This ensures excellent line and load regulations and helps to minimize the switch-off time of the MOSFETs, resulting in higher efficiency. The current mode control loop is also used to protect the converter from overcurrent and short circuit conditions.

In addition to providing excellent performance and reliability, the LTC3823EUH#TRPBF is also very cost-effective and easy to implement, making it an ideal choice for designers looking to develop economical, high-performance switching power supplies.