73 / 84
new products
input voltage range and can produce output currents in
multiple 10s of amps, depending on the topology and
choice of external components. It can be configured for
a 2:1 step-down ratio from an input voltage up to 72V.
Two of the LTC7820 IC’s can be cascaded for a 4:1 step-
down ratio. For even higher step-down ratios, such as
a 6:1, the Dickson converter topology is recommended
and is ideal for 54V input to a 9V outputs, requiring only
a single LTC7820. The LTC7820 can also be configured
for a 1:2 step-up ratio or a 1:1 inverter ratio from an input
voltage as high as 36V. External MOSFETs switch at a
fixed frequency, programmable from 100kHz to 1MHz.
The LTC7820’s powerful 1.1Ω N-channel MOSFET
gate drivers maximize efficiency and can drive multiple
MOSFETs in parallel for higher power applications.
The LTC7820 monitors system voltage, current and
temperature for faults, and uses a sense resistor for
overcurrent protection. It stops switching and pulls
the /FAULT pin low when a fault condition occurs. An
onboard timer can be set for appropriate restart/retry
times. The EXTVCC pin permits the LTC7820 to be
powered from the lower voltage output of the converter
or other available sources up to 40V, reducing power
dissipation and improving efficiency. Additional features
include soft switching for low EMI, a power good output
signal, undervoltage lockout and internal charge balance
circuitry.
Infineon extends industry-leading smart
power switches with PROFET™+2 and High
Current PROFET™ for improved energy
efficiency and miniaturization
Car makers want in-vehicle electronic systems to provide
a large number of energy-efficient functions in as little
space as possible. Infineon Technologies AG (FSE: IFX /
OTCQX: IFNNY) supports this trend with its new power IC
manufacturing technology SMART7. Infineon designed it
specifically for automotive applications such as Body Control
Modules or Power Distribution Centers. SMART7 power ICs
drive, diagnose and protect loads in applications like heating,
power distribution, air-conditioning, exterior and interior
lighting, seat and mirror adjustment. They also provide a cost-
effective and robust replacement of electromechanical relays
and fuses. SMART7 is based on thin-wafer technology that
reduces power losses and chip sizes.
Based on SMART7, Infineon now introduces the two high-
side power switch families PROFET™+2 and High Current
PROFET™. The SPOC™+2 multichannel SPI high-side
power controllers will follow within a year.
“In this decade, we have delivered one billion PROFET+
switches, the predecessor family to PROFET+2,” saidAndreas
Doll, Vice President and General Manager, Body Power
Automotive at Infineon. “The SMART7 power ICs enable
body and convenience applications with further enhanced
protection schemes, lower power dissipation in smaller
packages at less overall system cost for our customers.”
PROFET+2 for double-digit reduction in power dissipation
and PCB space
The PROFET+2 family was developed for automotive 12 V
lighting load applications and capacitive loads. These comprise
e. g. halogen bulbs in external lighting control, interior lighting
and dimming, as well as LED lighting. PROFET+2 devices
provide state-of-the-art diagnostics and protection features.
They maintain pin-out compatibility with their predecessor
family PROFET+ for zero-cost migration. There is no ECU
layout change needed, if single-channel devices are replaced
by dual-channel variants and vice versa. Compared to their
predecessor family, the PROFET+2 devices are up to 40
percent smaller in package size and improve energy efficiency
with 50 percent lower current consumption. The lowest ohmic
PROFET+2 device is the 8 mΩ dual-channel switch BTS7008-
2EPA with protection functions and diagnosis.
High Current PROFETs for load currents up to 20 A DC in
benchmark footprint
The new High Current PROFETs extend the flexible family
approach of PROFET+2 to on-state resistances R DS(ON)
from 8 mΩ down to 2 mΩ in the same TSDSO-14 package.
A High Current PROFET in a TSDSO-14 package with pin
pitch of only 0.65 mm offers today’s world-lowest R DS(ON)
New-Tech Magazine Europe l 73