LTC3810EG#TRPBF

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The LTC3810EG#TRPBF is a synchronous step-down DC/DC controller that provides excellent dynamic performance and powerful component flexibility for point-of-load power applications. It is the perfect choice for low noise, high efficiency and high power density designs. The device is part of the PMIC – Voltage Regulators – DC DC Switching Controllers group of power management integrated circuits (PMICs).

The LTC3810EG#TRPBF is a high-performance adaptive-on-time synchronous controller that operates at fixed high frequency with programmable current limit and adaptive output voltage control. It provides true analog current mode control, enabling excellent transient response, fast current loop settling time, reduced output voltage stress during one-time events and guaranteed minimum on-time. The LTC3810EG#TRPBF features a low operating current (typically 1.9mA) that increases conversion efficiency. It provides a self-contained compensation network and uses a single resistor to set the switch current limit.

With its high frequency operation (13MHz, adjustable), the LTC3810EG#TRPBF easily achieves frequency dithering for EMI reduction, and its low operating current helps reduce design size, cost, and power dissipation. Its slew rate limiting feature sets maximum controller output current to keep output inductor DCR current from overshooting its limit. The device also supports direct PWM dimming without high-frequency PWM noise generated by associated drivers.

The LTC3810EG#TRPBF has a wide input voltage range of 4.5V to 28V. It features good 2.5% reference accuracy, low differential output voltage sensing accuracy, adjustable output voltage range of 0.3V to 90% of the input voltage (VIN), and adjustable synchronization frequency of 200kHz to 17MHz. A soft-start waveform is available to turn on the LTC3810EG#TRPBF with a soft-start current waveform to reduce inrush current and limit output surge.

The LTC3810EG#TRPBF uses an internal regulator load to provide a stable output with no negative current spike. It also supports programmable pre-charge, with variable current, for large capacitors as well as variable slew rate for pre-charge for low ESR capacitors. In addition, the LTC3810EG#TRPBF can be operated with external clock synchronization, allowing the controller to use the same operating frequency as several other DC/DC converters in the application. This helps reduce EMI, as all the DC/DC converters can switch at the same frequency.

The LTC3810EG#TRPBF has an adjustable switching frequency that can be set anywhere between 200kHz and 17MHz. Additionally, the adaptive-on-time (AOT) control loop allows the converter to run at minimum on-time declared by a minimum-on-time parameter (tmin). When the load current increases, the on-time (ton) increases automatically, allowing the converter to track the load response while keeping the ripple within desired limits. The AOT control loop also provides current or inductor DCR sensing that can be used to reduce the inductor ripple current.

The LTC3810EG#TRPBF also includes multiple safety mechanisms for increased reliability and accurate current regulation. It includes a programmable peak current limit and/or constant current limit that is adjustable from 0.25% to 99%. These limits are set with two resistors external to the IC. It also includes an adjustable step-down current limit, which is programmable from 0.25% to 99%. The step-down current limit prevents current slew rate exceeding the designed maximum, which helps avoid power dissipation and converter oscillations.

The LTC3810EG#TRPBF provides an adjustable track-and-hold loop for tracking the output voltage for high-end applications. It allows the converter to track the output voltage accurately if the output voltage is dynamically changing, thereby providing a high-end solution for critical load applications (like telecommunications and networking).

To sum up, the LTC3810EG#TRPBF is a great choice for power designs that require high efficiency, small size, and low noise. With its wide input voltage range, it provides excellent dynamic performance, fast current loop settling time, adjustable current limit, programmable pre-charge, and adjustable voltage tracking for high-end applications. Therefore, the LTC3810EG#TRPBF is a reliable choice for power management ICs, and is an ideal device for the PMIC – Voltage Regulators – DC DC Switching Controllers group.

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