DC1924A External Power Switch Buck-Boost Controllers by Analog Devices

External Power Switch Buck-Boost Controllers
Status: Production
Series: LT8705
RoHS: Compliant
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The LT8705 is a high performance buck-boost switching regulator controller that operates from input voltages above, below or equal to the output voltage. The part has integrated input current, input voltage, output current and output voltage feedback loops. With a wide 2.8V to 80V input and 1.3V to 80V output range, the LT8705 is compatible with most solar, automotive, telecom and battery-powered systems.The LT8705 includes servo pins to indicate which feedback loops are active. The MODE pin selects among Burst Mode® operation, discontinuous or continuous conduction mode at light loads. Additional features include a 3.3V/12mA LDO, a synchronizable fixed operating frequency, onboard gate drivers, adjustable UVLO, along with input and output current monitoring with programmable maximum levels. LT8705 LT8705A Improved, pin-to-pin compatible version of LT8705. Recommended for all new designs

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Alternative Descriptions

Demo Board, Sync Buck-Boost Controller | Newark Electronics
DEMO BOARD, SYNC BUCK-BOOST CONTROLLER | element14
LT8705 DC to DC Controller 48VDC Output Demonstration Circuit | Richardson RFPD

DC1924A Development Boards & Evaluation Kits by Linear Technology

DEMO BOARD BUCK-BOOST CONVERTER

Education Maker & Hobbyist Electronics>Development Boards & Evaluation Kits>Power Management Development Kits
Status: Unknown
Series: -
RoHS: Unknown
Download Datasheet Visit Manufacturer Site View Pricing & Stock
LT8705 80V VIN and VOUT Synchronous 4-Switch Buck-Boost DC/DC Controller Demonstration circuit 1924A is a high performance buckboost converter featuring the LT®8705 that can operate from input voltages above, below or equal to the output voltage. The demo board input range is 36V to 80V. The output is optimized for 48V, 5A. Additional input bulk capacitance may be needed, subject to the source impedance. of 100W, even one percent of efficiency improvement is a big advantage in minimizing temperature rise. If an efficiency measurement is needed in an application, the output voltage must be measured at the output capacitors instead of at the load. This prevents cable loss from being counted as a loss of the board. The input voltage range of the LT8705 itself is 2.8V (need EXTVCC > 6.4V) to 80V and the output range is 1.3V to 80V. The part has integrated input current, input voltage, output current and output voltage feedback loops and is capable of bi-directional operation. The operating mode of the controller is determined through the MODE pin (jumper JP1). The MODE pin can select among discontinuous mode, forced continuous mode and Burst Mode® operation. Modifications can be made to DC1924A in order to increase the efficiency even higher: 1) Replacing the inductor with a physically bigger one, e.g. SER2918H-223 from Coilcraft, and 2) If the input and/or output voltage level is at a lower level, replacing MOSFETs with low voltage ones, e.g. Si7892BDP from Vishay, may also help. The CLKOUT output and the SYNC input can be used to synchronize switching between two or more DC1924A circuits. To supply the LT8705 chip from an external voltage supply (> 6.4V) through the EXTVCC terminal, cut the trace as marked on the board. The input range of the demo circuit is up to 80V, therefore, the demo circuit utilizes 100V MOSFETs. The typical efficiency is about 97% from a 36V input to 48V, 5A load, using the stock inductor. At the output power level The LT8705 data sheet gives a complete description of the part, operation and application information. The data sheet must be read in conjunction with this quick start guide for demo circuit 1924A. The LT8705EUHE is assembled in a 38-Lead (5mm × 7mm) plastic QFN package with a thermal pad underneath the chip. Proper board layout is essential for maximum thermal performance. See the data sheet section Circuit Board Layout Checklist.

Features

Specifications

Silicon Manufacturer Linear Technology
Silicon Core Number LT8705
Kit Application Type Power Management - Voltage Regulator
Application Sub Type Synchronous Buck-Boost Converter
Kit Contents Demonstration Board LT8705
Product Range -
Automotive Qualification Standard -
SVHC No SVHC (07-Jul-2017)
Features Operates with 36V-80V I/P & O/P is Optimized for 48V 5A. Additional Input Bulk Capacitance Needed

Frequently Asked Questions

Where can I find additional details, specifications and documents for a DC1924A?

Additional datasheets, footprints and schematics for DC1924A are listed on our Part Details page. You can also find images and similar parts to DC1924A on this page.

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What category does DC1924A fall under?

The DC1924A is listed under External Power Switch Buck-Boost Controllers.

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You can view similar parts to DC1924A when available in the External Power Switch Buck-Boost Controllers range under the specifications section at the bottom of the details page.

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Is the DC1924A RoHS compliant?

Yes. This part has been flagged as RoHS Compliant by Analog Devices.

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