37V, 1.2A (IOUT), 2.5MHz Step-Down DC/DC Converter with 150°C Maximum Junction Temperature

News Release ⎜ www.linear.com
37V, 1.2A (IOUT), 2.5MHz Step-Down DC/DC Converter with
150˚C Maximum Junction Temperature
MILPITAS, CA – July 1, 2010 – Linear Technology announces the H-Grade version of the
LT3686. The LT3686H is a 1.2A, 37VIN step-down switching regulator. The LT3686H operates
within a VIN range of 3.6V to 37V with overvoltage lockout, protecting the regulator and load
from transients as high as 55V, making it ideal for load dump and cold-crank conditions
commonly found in automotive applications as well as 24V industrial supplies. Its internal 1.85A
switch can deliver up to 1.2A of continuous output current at voltages as low as 0.8V. The
LT3686H’s switching frequency is user programmable from 300kHz to 2.5MHz, enabling
designers to maximize efficiency while avoiding critical noise-sensitive frequency bands. Its low
minimum on-time enables it to provide high switching frequencies even with high step-down
ratios. For example, with an input as high as 16V, it can deliver a 3.3V output using a 2MHz
switching frequency. The LT3686H also uses a unique design, which ensures that it maintains
constant frequency switching, even in very light load conditions. The device’s 3mm x 3mm
DFN-10 package and high switching frequency, which keeps the external inductor and capacitors
small, provides a compact, thermally efficient footprint.
The H-grade version operates up to a junction temperature of 150˚C, compared to the E
and I grade versions’ 125˚C maximum junction temperature. All electrical specifications are
identical for the E, I and H grade versions. The H-grade versions are tested and guaranteed to the
maximum junction temperature of 150˚C, making them ideal for automotive and industrial
applications which are subjected to high ambient temperatures.
Pricing for the LT3686HDD starts at $3.03 each in 1,000-piece quantities and is available
from stock. For more information, visit www.linear.com/pr/3686H.
37V, 1.2A (IOUT), 2.5MHz Step-Down DC/DC Converter with
150˚C Maximum Junction Temperature
page 2
Photo Caption: 37V with 55V Transient Protection, 1.2A Step Down DC/DC Converter with
150˚C Maximum Junction Temperature
Summary of Features: LT3686H
Wide Input Range:
o Operation from 3.6V to 37V
o Overvoltage Lockout Protects Circuit through 55V Transients
Low Minimum On-Time: Converts 16VIN to 3.3VOUT at 2MHz
1.2A Output Current
Adjustable Frequency: 300kHz to 2.5MHz, with ±5% Accuracy
Constant Switching Frequency at Light Loads
Tracking & Soft Start
Precision UVLO
Short-Circuit Robust
IQ in Shutdown <1uA
Internally Compensated
3mm × 3mm DFN Package
Maximum Junction Temperature of 150°C
About Linear Technology
Linear Technology Corporation, a manufacturer of high performance linear integrated circuits,
was founded in 1981, became a public company in 1986 and joined the S&P 500 index of major
public companies in 2000. Linear Technology products include high performance amplifiers,
comparators, voltage references, monolithic filters, linear regulators, DC-DC converters, battery
chargers, data converters, communications interface circuits, RF signal conditioning circuits,
uModule® products, and many other analog functions. Applications for Linear Technology’s
high performance circuits include telecommunications, cellular telephones, networking products
such as optical switches, notebook and desktop computers, computer peripherals,
video/multimedia, industrial instrumentation, security monitoring devices, high-end consumer
products such as digital cameras and MP3 players, complex medical devices, automotive
electronics, factory automation, process control, and military and space systems.
LT, LTC, LTM, uModule and
are registered trademarks of Linear Technology Corp. All other trademarks are the
property of their respective owners.
Press Contacts:
North America / Worldwide
UK & Nordic
John Hamburger, Director Marketing
Tel 408-432-1900 ext 2419
Alan Timmins
Tel: +44-1-252-629937
Doug Dickinson, Media Relations Manager
408-432-1900 ext 2233