www.newelectronics.co.uk 7
www.digikey.co.uk
Figure1:
Parallel two
LTC7150S
regulators
to extend
output current
capability to
40 A
The LT8642S is an 18 V/10A stepdown
monolithic Silent Switcher 2
regulator in a 4 mm × 4 mm LQFN
package. With only a ferrite bead and
input capacitor as the input EMI filter,
it is able to meet the stringent CISPR
25 Class 5 radiated EMI specification
with abundant margin. Another
popular EMI specification is CISPR
32 often used by consumer electronics
manufacturers. LT8642S can easily
meet the CISPR 32 Class B radiated
EMI specification even without the
input EMI filter.
The LTC7150S is the first of its
kind, a 20A, high efficiency stepdown
regulator with Silent Switcher 2
technology incorporated to minimise
the electrical magnetic emission,
which greatly simplifies the EMI filter
design and layout. The Silent Switcher
2 architecture brings in exceptional
EMI performance while minimising
the ac switching losses in monolithic
regulators. Hot loop capacitors are
included in the IC significantly
reducing noisy antenna size and
minimises EMI.
Switching node ringing is
minimised on the very fast switch
edges, reducing high frequency noise,
and associated energy stored in the
hot loop. Also, the hot loop is split
in two and symmetrically laid out
for EMI self-cancellation. This yields
quiet power for the noise-sensitive
automotive environments, where
powerful SoCs are employed for
advanced drive assistance systems
(ADAS) or autonomous drive systems.
This also satisfies the requirements of
telecom, transportation, and industrial
systems, where high efficiency, low
noise power supplies are needed to
power the next generation SoCs,
CPUs, and microprocessors.
LTC7150S passes the CISPR 25
radiated EMI peak limit with a simple
EMI filter installed in the front.
Expanding output current
Advanced functions such as
autonomous drive and self-parking
demand more powerful SoCs to
implement live stream visuals or
artificial intelligence. For processor
systems that demand more than
/www.newelectronics.co.uk
/www.digikey.co.uk