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 Current and Output Voltage Feedback Loops
• Improved Light Load Transition from DCM to FCM
• Improved IMON_OUT, IMON_IN Offset When Cold
• Clock Output Usable To Monitor Die Temperature

Typical Application

Description

The LT®8705A 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 LT8705A is compatible with most solar, automotive, telecom and battery-powered systems. The LT8705A is an improved pin compatible version of the LT8705 and is recommended for new designs. See LT8705A vs LT8705 in the Applications Information section for more information.

The LT8705A includes a MODE pin to select 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, and onboard gate drivers.