Analog Devices announced the launch of LT8650S, a new dual 4A, 42V input synchronous step-down switching regulator. This product adopts a proprietary Silent Switcher2 architecture, and is characterized by minimizing hot loop area through the use of 4 internal input capacitors, 2 internal BST capacitors, and 1 INTVCC capacitor.

The LT8650S also significantly reduces EMI emissions by adopting a design where stable switching edges and internal circuits are coupled to ground plane and copper traces are used instead of bonding wires. Thanks to these improved EMI performance characteristics, the design is less affected by PCB layout, simplifying the design and reducing risk even when using 2-layer PCBs. The LT8650S operates at a switching frequency of 2MHz across the entire load range, making it easy to meet automotive CISPR 24, Class 5 peak EMI specifications. EMI levels can be further reduced using spread-spectrum frequency modulation techniques.

The synchronous rectification of the LT8650S provides high efficiency of 94.6% when operating at a switching frequency of 2MHz. Supporting an input voltage range of 3.0V to 42V, it is ideal for automotive and industrial applications. The integrated high-efficiency switches can be set to voltages as low as 0.8V, can simultaneously provide continuous output current of up to 4A per channel, and can deliver peak loads of up to 6A.

The Burst Mode operation of the LT8650S has a standby current consumption of only 6.2µA (2 channels), making it suitable for applications requiring extended battery operating life, such as automotive always-on systems. With a minimum on-time of 40ns, the LT8650S can switch at a fixed 2MHz frequency from 16V input to 2V output, allowing designers to optimize efficiency and avoid noise-sensitive critical frequency bands. The LT8650S offers a compact and thermally efficient 32-pin, 4mm x 6mm LQFP package footprint and high switching frequency, enabling system designers to use smaller external inductors and capacitors.

The LT8650S uses integrated essential boost diodes, oscillators, control and logic circuits on a single die, along with internal high-efficiency power switches on both high and low sides. Low-ripple Burst Mode operation maintains high efficiency at low output currents, keeping output ripple below 10mVP-P. For applications requiring fast transient response or current sharing characteristics between two channels, the external VC pin can be utilized.

When ultra-low noise operation is required, the LT8650S can be programmed to operate in forced continuous mode across the entire load range using spread-spectrum frequency modulation techniques. Switching frequency can be set and synchronized in the range of 300KHz to 3MHz. With special design techniques and new high-speed processes applied, high efficiency is provided even over a wide input voltage range, and the current-mode topology of the LT8650S ensures fast transient response and excellent loop stability. Additionally, it includes features such as die temperature monitoring, power-good flag, output soft-start/tracking, and thermal protection.