industry news
Subscribe to EE Journal Daily Newsletter

2.7V to 38V/500mA Low Noise Buck-Boost Charge Pump Saves Space and Reduces EMI

MILPITAS, CA & NORWOOD, MA – June 12, 2017 – Analog Devices, Inc., which recently acquired Linear Technology Corporation, announces the LTC3246, a compact, low noise buck-boost charge pump with integrated watchdog timer capable of up to 500mA of output current. The LTC3246 uses multimode switched capacitor conversion to maintain regulation over a wide 2.7V to 38V input voltage range and produces a regulated 3.3V, 5V, or externally adjustable (2.5V to 5V) output. Internal circuitry automatically selects a conversion ratio of 2:1, 1:1 or 1:2 to optimize efficiency as input voltage and load conditions vary. Low operating current (20μA regulating with no load, 1.5μA in shutdown), low EMI switching and low external device count (three small ceramic capacitors and no inductors) make the LTC3246 ideal for noise-sensitive space constrained automotive applications such as ECU/CAN transceiver supplies, as well as industrial housekeeping supplies and efficient low power 12V to 5V conversion.

The LTC3246’s switched capacitor architecture with inherent soft switching provides lower radiated noise and EMI compared with conventional switching regulators. Timing control for the reset timeout and the windowed watchdog timeout can be adjusted using external capacitors on the RT and WT pins, or fixed internally via pin strapping. The accurate threshold of the reset input can be used for additional supply monitoring, or can be configured as a pushbutton reset. Other features include stability with ceramic capacitors, foldback current limiting to prevent excessive current flow during start-up, plus short-circuit and thermal protection.

The LTC3246 is available in a compact, thermally enhanced 16-lead MSOP package. The E and I grades feature a –40°C to 125°C operating junction temperature, the H grade has a –40°C to 150°C operating junction temperature, and the MP grade is specified for –55°C to 150°C operation. 1000-piece pricing starts at $3.25 each for the E grade and all devices are available from stock. For more information, visit www.linear.com/product/LTC3246.

Summary of Features: LTC3246

2.7V–38V Operating Range (42V Abs Max)
IQ = 20µA Operating; 1.5µA in Shutdown
Multimode Buck-Boost Charge Pump (2:1, 1:1, 1:2) with Automatic Mode Switching
12V to 5V Efficiency = 81%
IOUT Up to 500mA
VOUT: Fixed 3.3V, 5V or Adjustable (2.5V to 5V)
Ultralow EMI
Engineered for Diagnostic Coverage in ISO 26262 Systems
Overtemperature & Short-Circuit Protection
Operating Junction Temperature: 150°C Max
POR/Watchdog Controller with External Timing Control
Thermally Enhanced 16-Lead MSOP Package

Leave a Reply

featured blogs
Aug 18, 2017
After leaving the title of yesterday's post in German, the obvious place to go for the next stop on the summer of computer museums is Germany. If you ask people which was the first digital computer, the answer tends to vary with the respondent's nationality. Do comp...
Aug 18, 2017
Bourbon lovers appreciate their favorite spirits in many forms.  Neat. On the Rocks. A favorite mixed drink. An emerging trend in bourbon drinking comes from an unlikely place: Infinite Harvest – an indoor hydroponic vertical farm. Infinite Harvest produces ...
Aug 09, 2017
Recall for a moment a scene—you’ve probably witnessed something like it at trade shows or on video dozens of times. A robot arm moves purposefully from its rest position. It swoops down on an object—a sphere, say—plucks it up, holds it aloft, replaces it, ...
Aug 03, 2017
Speedcore eFPGAs are embeddable IP that include look-up tables, memories, and DSP building blocks, allowing designers to add a programmable logic fabric to their SoC. The Speedcore IP can be configured to any size as dictated by the end application. The SoC supplier defines t...