DESCRIPTION
The LT®8705 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 operating mode of the controller is determined through the MODE pin. The MODE pin can select among discontinuous mode, forced continuous mode and Burst Mode®operation. The LT8705 also features programmable UVLO and switching currents, along with input and output current monitoring with programmable maximum levels.

FEATURES
■ Single Inductor Allows VIN Above, Below, or Equal to Regulated VOUT
■ VIN Range 2.8V (Need EXTVCC > 6.4V) to 80V
■ VOUT Range: 1.3V to 80V
■ Quad N-Channel MOSFET Gate Drivers
■ Synchronous Rectification: Up to 98% Efficiency
■ Input and Output Current Monitor Pins
■ Synchronizable Fixed Frequency: 100kHz to 400kHz
■ Integrated Input Current, Input Voltage, Output Current and Output Voltage Feedback Loops
■ Clock Output Usable To Monitor Die Temperature
■ Available in 38-Lead (5mm × 7mm) QFN and TSSOP Packages with the TSSOP Modified for Improved High Voltage Operation

APPLICATIONS
■ High Voltage Buck-Boost Converters
■ Input or Output Current Limited Converters