The LTC7821 is an industry first hybrid step-down controller that combines a switched capacitor circuit with a synchronous step-down controller, enabling up to a 50% reduction in DC/DC converter solution size compared to traditional step-down solutions. This improvement is enabled by a 3X higher switching frequency without compromising efficiency. Alternatively, when operating at the same frequency, an LTC7821 based solution can provide up to a 3% higher efficiency. Other benefits include low EMI and reduced MOSFET stress due to a soft-switched front end. A single device can supply up to 300 watts. It’s current mode control allows multiple devices to be paralleled.
Device Development Motivations
Intermediate bus converters used in distributed power architectures normally require isolation from input to output. However, in many new applications, isolation is not necessary since the upstream 48V or 54V input is already isolated from the hazardous AC mains. The LTC7821 significantly reduces the IBC solution size in power distribution, datacom and telecom as well as emerging 48V Automotive systems.
Target Applications
- Intermediate Bus Converters in Power Distribution
- Datacom, Telecom, Medical and Storage Systems
Key Technical Features
- Wide VIN Range: 10V to 72V
- Wide VOUT Range: 0.9V to 33.5V
- Provides a 50% Reduction in Solution Size vs Traditional Buck
- Or a Up to a 3% Efficiency Improvement
- Up to 300 Watts with a Single Device
- Low EMI/Soft Switching
- Excellent Current Sharing
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