Wide input voltage range of 10~72V

Mouser Electronics is supplying Analog Devices’ Power by Linear™ LTC7821 hybrid buck controller. The LTC7821 is the industry’s first product to combine a switched capacitor circuit with a synchronous buck controller, reducing its size by 50% compared to existing buck solutions.

Analog Devices' LTC7821 buck controller, supplied by Mouser, operates over a wide input voltage range of 10 to 72 V and provides an output voltage range of 0.9 to 33.5 V. In typical 48-12 V (20 A) applications, engineers can achieve up to 97% efficiency by using the LTC7821, which switches at 500 kHz, three times higher than existing buck solutions.

Thanks to the high switching frequency, the LTC7821 can use much less inductance, resulting in faster transient response times and smaller solution sizes. On the other hand, the soft-switching front-end provides low EMI and reduced MOSFET stress.

The LTC7821 controller, equipped with various protection functions, pre-balances capacitors during operation, thereby preventing inrush current associated with existing switching capacitor circuits. The controller's sensing resistor provides overcurrent protection, while monitoring system voltage, current, and temperature to prevent errors.

The LTC7821 controller is designed based on ADI's proprietary architecture combining a soft-switching charge pump topology and a synchronous drop converter, offering superior EMI (electromagnetic interference) performance and efficiency compared to conventional switching architectures. Operating in an input voltage range of 10 to 72 V, the LTC7821 controller has an output voltage range of 0.9 to 33.5 V (accuracy ±1%).

The powerful 1Ω N-channel MOSFET gate driver of the LTC7821 controller can drive multiple MOSFETs installed in parallel in applications requiring higher output while maximizing efficiency.

Based on a current mode control architecture, multiple LTC7821 units can be operated in parallel or multiphase configurations, and due to their excellent current sharing performance, they can be used in applications requiring much higher output.

The LTC7821 step-down controller is a device suitable for next-generation non-isolated intermediate bus applications in the fields of data communication and telecommunications. It is also suitable for high-current distribution power systems and 48V systems for emerging automobiles.