Dual (2.5A + 1.5A) Synchronous Step-Down DC/DC Converter Delivers 95% Efficiency & Operates from 3.4V to 42V Inputs

News Release  www.linear.com
Dual (2.5A + 1.5A) Synchronous Step-Down DC/DC Converter Delivers
95% Efficiency & Operates from 3.4V to 42V Inputs
MILPITAS, CA – May 12, 2015 – Linear Technology Corporation announces the LT8616, a 42V
input capable, high efficiency dual synchronous monolithic step-down switching regulator. Its
dual channel design delivers independent 2.5A and 1.5A continuous current to outputs as low as
0.8V. A dual channel synchronous rectification topology delivers up to 95% efficiency while
Burst Mode® operation keeps quiescent current under 6.5µA (both channels enabled) in no-load
standby conditions, making it ideal for always-on systems. Switching frequency can be
programmed from 200kHz to 3MHz and is synchronizable throughout this range.
The LT8616’s 35ns minimum on-time enables 16VIN to 1.8VOUT step-down conversions,
while switching at 2MHz helps designers avoid critical noise-sensitive frequency bands, such as
AM radio while having a very compact solution footprint. Its 3.4V to 42V input voltage range
makes it ideal for automotive applications which must regulate through cold-crank and stop-start
scenarios with minimum input voltages as low as 3.4V and load dump transients in excess of
40V. Each channel of the LT8616 maintains a minimum dropout voltage of only 400mV (at1A)
under all conditions, enabling it to excel in scenarios such as automotive cold-crank. The
LT8616’s 28-lead thermally enhanced TSSOP package and high switching frequency keeps
external inductors and capacitors small, providing a compact, thermally efficient footprint.
The LT8616 utilizes dual internal top and bottom high efficiency power switches with the
necessary boost diodes, oscillator, control and logic circuitry integrated into a single die. Each
Dual (2.5A + 1.5A) Synchronous Step-Down DC/DC Converter Delivers 95%
Efficiency & Operates from 3.4V to 42V Inputs
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channel switches 180 degrees out-of-phase to reduce output ripple. Each channel has a separate
input for added design flexibility. Low ripple Burst Mode operation maintains high efficiency at
low output currents while keeping output ripple below 15mVP-P. Unique design techniques and a
new high speed process enable high efficiency over a wide input voltage range, and the LT8616’s
current-mode topology provides fast transient response and excellent loop stability. Other
features include internal compensation, power good flags, output soft-start/tracking and thermal
The LT8616 is available in a thermally enhanced 28-lead TSSOP package. Three
temperature grades are available, with operation from –40°C to 125°C (junction) for the
extended (E) and industrial (I) grades and a high temperature (H) grade of –40°C to 150°C. The
1,000 piece price starts at $4.15. All versions are available from stock. For more information,
visit www.linear.com/product/LT8616.
Photo Caption: 42V, Dual Output 3MHz Synchronous Step-Down DC/DC Converter
Summary of Features: LT8616
Wide Input Voltage Range: 3.4V to 42V
2.5A and 1.5A Buck Regulators with Separate Inputs
Fast Minimum Switch On-Time: 35ns
Ultralow Quiescent Current Burst Mode® Operation:
o 6.5μA IQ Regulating 12VIN to 5VOUT and 3.3VOUT
o Output Ripple < 15mV
180° Out-of-Phase Switching
Adjustable and Synchronizable: 200kHz to 3MHz
Accurate 1V Enable Pin Thresholds
Internal Compensation
Output Soft-Start and Tracking
TSSOP Package: Output Stays at or Below Regulation Voltage During Adjacent Pin Short or
When a Pin Is Left Floating
Thermally Enhanced 28-Lead TSSOP Package
Dual (2.5A + 1.5A) Synchronous Step-Down DC/DC Converter Delivers 95%
Efficiency & Operates from 3.4V to 42V Inputs
page 3
The USA list pricing shown is for budgetary use only. International prices may differ due to local
duties, taxes, fees and exchange rates.
About Linear Technology Linear Technology Corporation, a member of the S&P 500, has been designing, manufacturing and marketing a broad line of high performance analog integrated circuits for major companies worldwide for over three decades. The Company’s products provide an essential bridge between our analog world and the digital electronics in communications, networking, industrial, automotive, computer, medical, instrumentation, consumer, and military and aerospace systems. Linear Technology produces power management, data conversion, signal conditioning, RF and interface ICs, µModule® subsystems, and wireless sensor network products. For more information, visit www.linear.com
, LT, LTC, LTM, Linear Technology, the Linear logo, Burst Mode and µModule are registered trademarks of
Linear Technology Corp. All other trademarks are the property of their respective owners.
Press Contacts:
North America / Worldwide
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John Hamburger, Director Marketing
[email protected]
Tel: 408-432-1900 ext 2419
Alan Timmins
[email protected]
Tel: +44-1-252-629937
Doug Dickinson, Media Relations Manager
[email protected]
Tel: 408-432-1900 ext 2233