LT8705

PRODUCTION

80V VIN and VOUT Synchronous 4-Switch Buck-Boost DC/DC Controller

Analog Devices LT8705 Product Info

10 February 2026 6

Features

Single Inductor Allows V_IN Above, Below, or Equal to Regulated V_OUT
V_IN Range 2.8V (Need EXTV_CC > 6.4V) to 80V
V_OUT 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 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 Improve Voltage Operation

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.

Part details & applications



LT8705
LT8705A	Improved, pin-to-pin compatible version of LT8705. Recommended for all new designs

Applications

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

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