industry news
Subscribe Now

Wide Input Voltage Range Step-Down DC/DC Controller Features -55°C to 150°C Operating Junction Temperature

MILPITAS, CA – July 13, 2011 – Linear Technology Corporation announces the H- and MP- grade versions of the LTC3851A, a wide input voltage range (4V to 38V) synchronous step-down DC/DC controller that encompasses a broad range of applications, including most intermediate bus voltages and battery chemistries. The strong onboard MOSFET gate drivers enable the use of high power external MOSFETs to produce output currents up to 25A with output voltages ranging from 0.8V to 5.5V, ideal for point-of-load requirements. These H- and MP-grade versions are tested and guaranteed to operating junction temperature ranges from -40°C to 150°C and -55°C to 150°C, respectively. Applications include automotive systems, industrial, medical, datacom and telecom.

A constant-frequency, current-mode architecture allows a selectable fixed or phase-locked loop (PLL) frequency from 250kHz to 750kHz . Output current sensing is accomplished by measuring the voltage drop across the output inductor (DCR) or using an optional sense resistor. Current foldback limits MOSFET heat dissipation during short circuit and overload conditions. Selectable continuous, pulse skipping or Burst Mode® operation is user controlled to optimize light load efficiency. With up to 99% duty cycle, the LTC3851A/-1 has a very low dropout voltage, a useful feature for extending run times in battery powered applications. Additional features include tracking and adjustable soft-start. The LTC3851A-1 differs from the LTC3851A in that it has a power good signal instead of adjustable current limit.

The LTC3851AH/-1 and LTC3851AMP/-1 are available in a thermally enhanced MSOP-16 package. The 1000-piece price starts at $2.24 each for the H-grade devices and $5.29 each for the MP-grade parts, respectively. For more information, visit www.linear.com/product/LTC3851A

Summary of Features: LTC3851A/-1

  • VIN Range from 4V to 38V
  • Strong Onboard N-Channel MOSFET Driver
  • Current-Mode Control
  • DCR or RSENSE Current Sense Options
  • Programmable Current Limit Threshold Voltage
  • Phase-Locked-Loop Synchronization
  • Adjustable Soft-Start or Tracking
  • Power Good Signal
  • Fixed Operating Frequency or Synchronizable from 250kHz to 750kHz

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 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, and µModule® subsystems.

LT, LTC, LTM, µModule, Burst Mode and  are registered trademarks of Linear Technology Corp. All other trademarks are the property of their respective owners.

Leave a Reply

featured blogs
Dec 19, 2024
Explore Concurrent Multiprotocol and examine the distinctions between CMP single channel, CMP with concurrent listening, and CMP with BLE Dynamic Multiprotocol....
Dec 24, 2024
Going to the supermarket? If so, you need to watch this video on 'Why the Other Line is Likely to Move Faster' (a.k.a. 'Queuing Theory for the Holiday Season')....

featured video

Introducing FPGAi – Innovations Unlocked by AI-enabled FPGAs

Sponsored by Intel

Altera Innovators Day presentation by Ilya Ganusov showing the advantages of FPGAs for implementing AI-based Systems. See additional videos on AI and other Altera Innovators Day in Altera’s YouTube channel playlists.

Learn more about FPGAs for Artificial Intelligence here

featured chalk talk

Vector Funnel Methodology for Power Analysis from Emulation to RTL to Signoff
Sponsored by Synopsys
The shift left methodology can help lower power throughout the electronic design cycle. In this episode of Chalk Talk, William Ruby from Synopsys and Amelia Dalton explore the biggest energy efficiency design challenges facing engineers today, how Synopsys can help solve a variety of energy efficiency design challenges and how the shift left methodology can enable consistent power efficiency and power reduction.
Jul 29, 2024
107,789 views