CC Blog Product News

Dual Synchronous Step-Down DC/DC Converter Delivers 95% Efficiency

Linear Technology recently announced the LT8616, a 42-V input capable, high-efficiency dual synchronous monolithic step-down switching regulator. Its dual channel design delivers independent 2.5- and 1.5-A continuous current to outputs as low as 0.8 V. A dual channel synchronous rectification topology delivers up to 95% efficiency while Burst Mode operation keeps quiescent current under 6.5 µA (both channels enabled) in no-load standby conditions, making it ideal for always-on systems. Switching frequency can be programmed from 200 kHz to 3 MHz and is synchronizable throughout this range.LT8616 Linear

The LT8616’s 35-ns minimum on-time enables 16 VIN to 1.8 VOUT step-down conversions, while switching at 2 MHz helps you avoid critical noise-sensitive frequency bands, such as AM radio while having a very compact solution footprint. Its 3.4- to 42-V 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 3.4 V and load dump transients in excess of 40 V. Each channel of the LT8616 maintains a minimum dropout voltage of only 400 mV (at 1 A) 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 channel switches 180° 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 15 mVPP. 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 protection.

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.

Features

  • 3.4 to 42 V Input voltage range
  • 5- and 1.5-A Buck regulators with separate inputs
  • Fast minimum switch on-time: 35 ns
  • Ultralow quiescent current burst mode operation
  • 180° Out-of-phase switching
  • Adjustable and synchronizable: 200 kHz to 3 MHz
  • Accurate 1-V Enable pin thresholds
  • Internal compensation
  • Output soft-start and tracking
  • TSSOP Package:
  • Thermally enhanced 28-lead TSSOP package

 

— ADVERTISMENT—

Advertise Here


Don't miss out on upcoming issues of Circuit Cellar. Subscribe today!

 
 
Note: We’ve made the October 2017 issue of Circuit Cellar available as a free sample issue. In it, you’ll find a rich variety of the kinds of articles and information that exemplify a typical issue of the current magazine.


Would you like to write for Circuit Cellar? We are always accepting articles/posts from the technical community. Get in touch with us and let's discuss your ideas.

Become a Sponsor