Dual 42V 4A synchronous step-down regulator has ultralow EMI emissions
The Silent Switcher2 architecture in the LT8650S uses four internal input capacitors as well as two internal BST and a single INT VCC capacitor to minimise the area of the hot loops. Combined with very well controlled switching edges and an internal construction using copper pillars instead of bond wires and an integral ground plane, the LT8650S’s design reduces EMI emissions. This improved EMI performance is not sensitive to PCB layout, simplifying design and reducing risk even when using two layer PC boards.
The LT8650S can easily pass the automotive CISPR 25, Class 5 peak EMI limits with a 2MHz switching frequency over its entire load range. Spread spectrum frequency modulation is also available to lower EMI levels further.
The LT8650S’s synchronous rectification delivers efficiency up to 94.6% with a switching frequency of 2MHz. Its 3.0V to 42V input voltage range is aimed at automotive and industrial applications and the switches can deliver up to 4A of continuous output current simultaneously and up to 6A peak loads on either channel to output voltages as low as 0.8V.
The Burst Mode operation ensures only 6.2µA of quiescent current (for both channels), well suited for applications such as automotive always-on systems with extended operating battery life. The LT8650S’s fast minimum on-time of only 40ns enables 2MHz constant frequency switching from a 16V input to a 2V output, enabling designers to optimize efficiency while avoiding critical noise-sensitive frequency bands.
The 32-lead 4mm x 6mm LQFN package and high switching frequency keeps external inductors and capacitors small, providing a compact, thermally efficient footprint. An industrial temperature version, the LT8650SIV, is tested and guaranteed to operate from a ̶ 40°C to 125°C operating junction temperature. Pricing starts at $5.75 each for 1,000-piece quantities and both versions are available from stock.
www.linear.com/product/LT8650S
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