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New-Tech Magazine l 75
This work was funded by U.S. Air
Force Office of Scientific Research.
TI's synchronous DC/DC
buck regulators eliminate
switch-node ringing in
automotive applications
Technology
Texas Instruments (TI) (NASDAQ:
TXN) today introduced two 36-V, 2.1-
MHz synchronous buck regulators
that eliminate switch-node ringing to
reduce electromagnetic interference
(EMI), improve power density,
and operate in deep drop-out
conditions. The 2.5-A LM53625-Q1
and 3.5-A LM53635-Q1 regulators
are designed for high-voltage DC/
DC step-down applications such as
automotive infotainment, high-end
cluster, advanced driver assistance
systems (ADAS) and body power-
supply systems. Wettable flank
packagingenablesoptical inspection
to reduce manufacturing costs. By
using these step-down regulators
together with TI's WEBENCH®
Automotive Design tool, engineers
can get their automotive designs to
market faster. For more information,
samples and an evaluation module,
see
www.ti.com/lm53635q1-pr.36-V, 2.1-MHz synchronous buck
regulators from Texas Instruments
eliminate switch-node ringing to
reduce electromagnetic interference
(EMI), improve power density,
and operate in deep drop-out
conditions. The 2.5-A LM53625-Q1
and 3.5-A LM53635-Q1 regulators
are designed for high-voltage DC/
DC step-down applications such as
automotive infotainment, high-end
cluster, advanced driver assistance
systems (ADAS) and body power-
supply systems.
Switch node ringing is inherent in
all switch-mode power supplies. By
reducing parasitic inductance and
capacitance in the LM53625-Q1
and LM53635-Q1 regulators, these
power solutions lower noise and
EMI emissions by up to 15 dB at the
system level, which requires less
external EMI filtering, saves printed
circuit board (PCB) area and simplifies
compliance with CISPR 25 automotive
EMI requirements. Watch a video that
demonstrates how to solve automotive
EMI, thermal and system challenges
with TI's LM53635-Q1.
LM53625-Q1 and LM53635-Q1 key
features and benefits
Wide 3.5-V to 42-V operating
range handles start-stop and load-
dump conditions for 12-V lead acid
automotive batteries. Read the
blog post, "What to consider when
designing an automotive power
supply."
Provides up to 93 percent efficiency at
2.1-MHz operation to support compact
and high-temperature conditions in
automotive applications.
Low 18-uA quiescent current (IQ) in
standby extends battery life in "always
on" applications.
Wettable flank packaging enables
post-solder optical inspection. Read
the blog post, "The value of wettable
flank-plated QFN packaging for
automotive applications."
Deep drop-out performance of
less than 0.6 V under full load and
temperature
conditions
enables
compliance with stringent cold-crank
and start-stop conditions, saving
system cost and solution size.
The LM53625-Q1 and LM53635-Q1
join
the
recently
released
LM53600-Q1,
LM53601-Q1,
LM53602-Q1, LM53603-Q1 and
LM5140-Q1 buck converters to create
a complete family of controllers and
regulators designed for automotive
systems that draw less than 0.65 A of
power to more than 10 A. All of these
devices feature greater than 2-MHz
switching frequency, low operating IQ
and EMI reduction features.
Create an automotive infotainment
power system
Download the "Infotainment Power
System Reference Design for
Automotive" to view a full off-battery
front-end power supply for automotive
infotainment systems. The reference
design includes the LM53635-Q1
regulator,
LM27313-Q1
boost
converter and LM74610-Q1 smart
diode controller. The reference design
meets all industry tests including
ISO 7637 pulse, cold crank, reverse
battery, input over-voltage and CISPR
25 Class 5-conducted EMI.
Availability, packaging and pricing
The new DC/DC regulators are
available in volume now from TI
and its authorized distributors.
Offered in a 22-pin, 4-mm-by-5-
mm very thin quad flat no-lead
(VQFN) package, the LM53625-Q1
is priced at US$2.79 in 1,000-unit
quantities and the LM53635-Q1
is priced at US$3.22. Order the
LM536253QEVM
evaluation
module and download a PSpice
transient model.
Find out more about TI's power-
management portfolio:
Get more information on TI's DC/DC
regulator portfolio for any power-
supply application.